GM862-GPS Software User Guide

GM862-GPS Software User Guide
GM862-GPS Software User Guide
GM862-GPS Software User Guide
1vv0300729 Rev. 4 - 24/01/07
GM862-GPS Software User Guide
1vv0300729 Rev. 4 - 24/01/07
Contents:
1
Overview .....................................................................................................................4
2
Basic Operations ........................................................................................................5
2.1
Command Syntax ...................................................................................................................................5
2.1.1
Interface Style...................................................................................................................................5
2.2
Command Response Timeout................................................................................................................6
2.3
Turning ON the GM862-GPS................................................................................................................9
2.4
Turning OFF the GM862-GPS..............................................................................................................9
2.5
Checking GSM device functionality ...................................................................................................10
2.5.1
Autobauding ...................................................................................................................................10
2.5.2
SIM presence checking...................................................................................................................11
2.5.3
Network checking...........................................................................................................................13
2.6
Placing a Voice call ...............................................................................................................................19
2.6.1
Voice call device set up ..................................................................................................................19
2.6.2
Phone number dialing.....................................................................................................................21
2.6.3
Closing the voice call .....................................................................................................................22
2.7
Placing a CSD Data call (not GPRS) ..................................................................................................23
2.7.1
Data call device set up ....................................................................................................................23
2.7.2
Phone number dialing (data call)....................................................................................................24
2.7.3
Closing the Data call.......................................................................................................................25
2.8
3
Answer an incoming Call .....................................................................................................................26
Advanced Operations ..............................................................................................28
3.1
Accessing the phonebook .....................................................................................................................28
3.1.1
Preliminary phonebook set up ........................................................................................................28
3.1.2
Phonebook entry search by Name ..................................................................................................32
3.1.3
Phonebook entry read by Index ......................................................................................................33
3.1.4
Phonebook entry Write...................................................................................................................34
3.1.5
Phonebook entry Delete..................................................................................................................36
3.1.6
Phonebook entry Dial .....................................................................................................................37
3.2
Distinguish Calls ...................................................................................................................................39
3.2.1
Identify the Call type ......................................................................................................................39
3.2.2
Identify the Caller...........................................................................................................................40
3.2.3
Restricting Calling Line Indication ................................................................................................41
3.2.4
Call Barring Control .......................................................................................................................43
3.3
DTMF tones ..........................................................................................................................................52
3.4
GSM Power Saving function ...............................................................................................................53
3.5
SMS handling........................................................................................................................................55
3.5.1
SMS device setup ...........................................................................................................................55
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3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
3.5.7
3.5.8
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IRA character set ............................................................................................................................66
Writing a New SMS to storage.......................................................................................................68
Sending an SMS previously stored.................................................................................................70
Sending a new SMS without storing it ...........................................................................................71
Deleting an SMS.............................................................................................................................73
Reading an SMS .............................................................................................................................74
Listing a group of SMSs.................................................................................................................76
3.6
Using General Purpose Input/Output pins.........................................................................................78
3.6.1
GPIO pin setup ...............................................................................................................................78
3.6.2
GPIO pin use ..................................................................................................................................80
3.7
Clock/Alarm function...........................................................................................................................84
3.7.1
Clock date/time...............................................................................................................................84
3.7.2
Alarm function................................................................................................................................86
4
GPRS operations ...................................................................................................... 91
4.1
Introduction ..........................................................................................................................................91
4.1.1
CSD application example ...............................................................................................................93
4.1.2
GPRS application example.............................................................................................................94
5
GPS operations .........................................................................................................95
5.1
Introduction ..........................................................................................................................................95
5.2
GM862-GPS Serial Ports .....................................................................................................................95
5.2.1
GPS SERIAL PORT B (NMEA)....................................................................................................95
5.3
WGS 84..................................................................................................................................................95
5.4
NMEA 0183...........................................................................................................................................96
5.4.1
GGA - Global Positioning System Fixed Data...............................................................................97
5.4.2
GLL - Geographic Position - Latitude/Longitude ..........................................................................98
5.4.3
GSA - GNSS DOP and Active Satellites........................................................................................99
5.4.4
GSV - GNSS Satellites in View ...................................................................................................100
5.4.5
RMC - Recommended Minimum Specific GNSS Data ...............................................................101
5.4.6
VTG - Course Over Ground and Ground Speed ..........................................................................102
5.5
Checking GPS device functionality...................................................................................................103
5.6
CONTROLLING GPS RECEIVER .................................................................................................103
5.6.1
POWER CONTROL OF GPS RECEIVER .................................................................................103
5.6.2
GPS RESET..................................................................................................................................104
5.6.3
GPS ANTENNA MANAGEMENT.............................................................................................105
5.6.4
GPS PARAMETERS SAVE ........................................................................................................106
5.6.5
RESTORE GPS PARAMETERS.................................................................................................106
5.6.6
READ ACQUIRED GPS POSITION ..........................................................................................106
6
Service and firmware update ................................................................................108
6.1
7
Step-by-Step upgrade procedure ......................................................................................................108
Document Change Log ..........................................................................................111
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GM862-GPS Software User Guide
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1 Overview
The purpose of this document is the description of some common AT command procedures that may
be used with the Telit GM862-GPS module.
In this document, all the basic functions of a mobile phone will be taken into account and for each one
of them, a proper command sequence will be suggested.
In the Advanced operation section the more useful services and features of the GSM network
supported by the Telit GM862-GPS module is taken into account and some command sequence and
usage are provided for each one of them.
This document and its suggested command sequences shall not be considered mandatory; instead,
the information given shall be used as a guide for properly using the Telit module. For further
commands and features that may not be explained in this document refer to the GM862-GPS Product
Description document where all the supported AT commands are reported.
NOTE
The information presented in this document is believed to be accurate and reliable. However, Telit
Communications S.p.A. assumes no responsibility for its use, nor any infringement of patents or other rights of
third parties, which may result from its use. No license is granted by implication or otherwise under any patent
rights of Telit Communications S.p.A. other than for circuitry embodied in Telit products. This document is
subject to change without notice.
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2
Basic Operations
2.1 Command Syntax
In the next paragraphs the following notations are used:
<cr>
represents the Carriage Return Character (13)
<lf>
represents the Line Feed Character (10)
<xx>
represents a parameter whatever name is in place of the xx. (< and > characters are
only for delimiting the parameter and must not be issued to the terminal).
[<xx>] represents an optional parameter whatever name is in place of the xx. ([ and ]
characters are only for delimiting the optional parameter and must not be issued to the
terminal).
2.1.1 Interface Style
The GM862-GPS module is using an AT interface that is defined in the document 80000ST10025a
(AT Commands Reference Guide). The specification defines 3 possible AT interfaces:
0 - AT command interface of the products, to the GM862-GSM and GM862-GPRS interface style
1 – AT interface of the products, to the GM862-PCS, PYTHON, QUAD-PY, TRIZIUM and GM862QUAD, PY interface style
2 - switches the AT command interface style of the product, to the new products like GE864, GC864
and the GPS products
The default interface for the GM862-GPS product is 2.
The switch between the different interfaces could also be performed with the #SELINT AT command.
Refer to the AT Commands Reference Guide for the full command description.
All the AT commands described in this specification is related to SELINT 2
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2.2 Command Response Timeout
Every command issued to the Telit GM862-GPS returns a result response if response codes are
enabled (default) (see command ATQn). The time needed to process the given command and return
the response varies from command to command and may depend also from the network on which the
command may interact. As a result every command is provided with a proper timeout time, if this time
elapses without any result from the operation, then the ERROR response is reported as if the
operation was not successful.
The timeout time is quite short for commands that imply only internal set up commands, but may be
very long for command that interact with the network (or even Networks).
NOTE: In case no response is received after the timeout time has been elapsed, then try
repeating the last command and if still no response is received until the timeout time, then an
Unconditional Shutdown MUST be issued and then the device shall be powered ON again.
In the table below are listed all the commands whose timeout differs from the default 100 ms and their
effective timeout is reported:
Command
+CBST
+CR
+CRC
+CRLP
+CSCS
+CEER
+CGMI
+CGMM
+CGMR
+CGSN
+CIMI
+CNUM
+CREG
+COPS
+CLCK
@CLCK
+CPWD
+CLIP
+CLIR
+CCFC
+CCWA
+CHLD
+CUSD
+CAOC
+CSSN
Time-Out (Seconds)
0.2
0.2
0.2
0.2
0.2
5
5
5
5
20
20
20
5
180
180
180
180
180
180
180
20
20
180
20
20
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Command
+CLCC
+CPAS
+CPIN
+CSQ
+CPBS
+CPBR
+CPBF
+CPBW
+CALM
+CRSL
+CLVL
+CMUT
+CACM
+CAMM
+CPUC
+CMEE
+VTS
+GMI
+GMM
+GMR
+GSN
I3
I4
I5
+CSMS
+CPMS
+CMGF
+CSCA
+CSMP
+CSDH
+CSAS
+CRES
+CNMI
+CMGS
+CMSS
+CMGW
+CMGD
+CMGR
+CMGL
#CAP
#SRS
#SRP
#STM
#PCT
Time-Out (Seconds)
20
5
20
5
5
20
20
20
5
5
5
5
20
20
20
5
20
5
5
5
20
5
5
5
5
5
5
20
5
5
5
5
5
180 / 5 for prompt”>”
180
5 / 5 for prompt”>”
5
5
5
10
10
10
10
10
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Command
#SHDN
#QTEMP
#SGPO
#GGPI
#MONI
#CGMI
#CGMM
#CGMR
#CGSN
#CIMI
+CGACT
+CGATT
+CGDATA
+CGDCONT
+CGPADDR
+CGQMIN
+CGQREQ
Time-Out (Seconds)
10
10
10
10
10
5
5
5
20
5
180
180
20
20
20
20
20
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2.3 Turning ON the GM862-GPS
To turn on the GM862-GPS the pin ON# must be tied low for at least 1 second and then released.
To check if power has raised it is possible to monitor the PWRMON line, when this line goes high the
module is powered on, but before it remains on the device needs other 900ms for software startup.
Hence check the PWRMON line and 900 ms after its transition to high it is possible to release the ON#
pin.
When turning on the module, both devices (GSM and GPS) will be started.
The GPS antenna will be supplied and the receiver will start the scanning activity to achieve the Fix.
2.4 Turning OFF the GM862-GPS
The turning off of the device can be done in two ways:
• by software command
• by hardware shutdown (refer to Hardware User Guide)
When the device is shut down by software command or by hardware shutdown, it issues to the
network a detach request that informs the network that the device will not be reachable any more.
2.4.1.1 Software shutdown
•
•
Send command AT#SHDN<cr>
wait for OK response
The device shuts down with the following sequence of activities:
• Detach from the network
• Module Shutdown
In the case of Network unavailability the detach will be attempted few seconds (typical 6secs).
After this timeout the module will be shut down.
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2.5 Checking GSM device functionality
After a proper power on the device is ready to receive AT commands on the serial port.
Several things have to be checked in order to be sure that the device is ready to send and receive
calls and SMS:
2.5.1 Autobauding
At startup it is necessary to send an AT command to make the device set the right speed and
character format of the serial port. When this is done the device responds with OK. If no response is
received within the timeout period of 200 ms retry.
• Send command AT<cr>
• wait for OK response
after this initial command, it is advisable to fix the port rate, in order to eliminate possible errors in
detecting the serial speed rate:
• Send command AT+IPR=<rate><cr>
• wait for OK response
where rate is the port speed and can be 0, 300,1200,2400,4800,9600,19200,38400,57600,115200
bps.
If <rate> is set to 0, then automatic speed detection is enabled and also character format (see +ICF)
is set to auto-detect. (default)
If <rate> is specified and not 0, DTE-DCE speed is fixed at that speed, hence no speed auto-detection
(autobauding) is enabled.
TIP: The serial port suggested setting is: port speed 38400, character format 8N1 (8 bit per
char, No parity bit, 1 stop bit).
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2.5.2 SIM presence checking
After autobauding the first thing to check is the SIM presence and PIN code insertion, this can be done
with the following commands:
2.5.2.1 Enable the Extended error result codes
• send command AT+CMEE=1<cr>
• wait for OK response
or if you prefer the verbose format instead of the numerical format then:
• send command AT+CMEE=2<cr>
• wait for OK response
2.5.2.2 Query SIM presence and status
• send command AT+CPIN?<cr>
• wait for response:
Response
+CPIN: SIM PIN
+CME ERROR: 10
Reason
SIM is present and PIN is
required to continue operations
SIM is present and 3 attempts
to give SIM PIN have failed, so
SIM PUK is required
SIM is present and no PIN code
is required to proceed
SIM not present
+CME ERROR: 13
SIM defect
+CME ERROR: 14
+CME ERROR: 15
SIM is busy
SIM is wrong type
+CPIN: SIM PUK
+CPIN: READY
Action
Proceed to par. 2.5.2.3
Send command
AT+CPIN=<SIM PUK>
Proceed ahead
Insert SIM or require SIM
insertion and repeat from par.
2.5.2.2
Check SIM insertion or require
a new SIM not defected and
repeat from par. 2.5.2.2
retry later
Check SIM, it must be a GSM
SIM.
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2.5.2.3 Provide SIM PIN (only if required see point 2.5.2.2)
• send command AT+CPIN=****<cr>
where **** stands for the SIM PIN code (e.g. 1234)
• wait for response:
Response
OK
ERROR
Reason
SIM PIN was correct
the PIN code inserted is not
correct
Action
Proceed ahead
Retry from par. 2.5.2.2
NOTE: When receiving the ERROR message, repeat Query SIM presence and status since after
3 failed attempts SIM PIN is not anymore requested, but SIM PUK is requested instead, hence
you may need to go through procedure 2.5.2.4
2.5.2.4 Provide SIM PUK (only if required see par. 2.5.2.2)
• send command AT+CPIN=*******,<newpin><cr>
where ******* stands for the SIM PUK code (e.g. 12345678) and <newpin> (e.g. 1234) will replace the
old pin in the SIM.
• wait for response:
Response
OK
ERROR
Reason
SIM PUK was correct
the SIM PUK code inserted is
not correct
Action
Proceed ahead
Retry from par. 2.5.2.4
TIP: When receiving the ERROR message, be careful to check if the SIM PUK is correct before
retrying, since after 10 failed attempts to provide the SIM PUK the SIM Card will lock and will
not be usable anymore.
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2.5.3 Network checking
2.5.3.1 Query network status
• send command AT+CREG?<cr>
• wait for response:
Response
+CME ERROR: 10
Reason
SIM not present or damaged
+CME ERROR: 11
SIM is present and PIN is
required to continue operations
No GSM/DCS network is found
+CREG: 0,0
or
+CREG: 1,0
+CREG: 0,1
or
+CREG: 1,1
+CREG: 0,2
or
+CREG: 1,2
+CREG: 0,3
or
+CREG: 1,3
+CREG: 0,4
or
+CREG: 1,4
+CREG: 0,5
or
+CREG: 1,5
Action
Check SIM or require SIM
insertion and repeat from par.
2.5.2.2
Repeat par. 2.5.2.3
Check for antenna cable
connection (antenna may be
disconnected or damaged) or
change position if the antenna
is OK. Repeat par. 2.5.3.1 until
a network is found.
Mobile is registered on its home Proceed ahead. Ready to call
network.
Mobile is currently not
registered on any network but is
looking for a suitable one to
register.
Mobile has found some
networks but it is not allowed to
register on any of them, no
roaming was allowed.
Mobile is in an unknown
network status
Mobile has found some
networks and is currently
registered in roaming on one of
them
Repeat procedure at par.
2.5.3.1 to see if it has found a
suitable network to register in.
Try in another place, and repeat
procedure at par.2.5.3.1
Repeat procedure at par.2.5.3.1
to see if it has found a suitable
network to register in
Proceed ahead. Ready to call
TIP: When a response +CREG: x,1 or +CREG: x,5 is received, then the device is ready to place
and receive a call or SMS. It is possible to jump directly to call setup procedures or SMS
sending procedures.
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2.5.3.2 Network operator identification
Once the mobile has registered on some network (or even if it has returned +CREG:x,3), it is possible
to query the mobile for network identifications codes an names:
• send command AT+COPS=?<cr>
•
wait for response in the format:
+COPS: [list of supported (<stat> ,<oper (in <format>=0)>,,
<oper (in <format>=2)>)s][,,(list of supported <mode>s),
(list of supported<format>s)]
where:
<stat> - operator availability
0 - unknown
1 - available
2 - current
3 - forbidden
<format>
0 - alphanumeric long form (max length 16 digits)
2 - numeric 5 digits [country code (3) + network code (2)]
<oper>: network operator in format defined by <format> parameter.
Note: since with this command a network scan is done, this command may require some seconds
before the output is given.
For example:
command:
AT+COPS=?<cr>
Answer:
+COPS: (2,"I WIND",,"22288"),(1,"SI MOBITEL GSM",,"29341"),(1,"vodafone IT",,"22
210"),(1,"SI.MOBIL",,"29340"),(3,"I TIM",,"22201"),,(0-4),(0,2)
OK
In this case the mobile is registered on the network " I WIND " which is a network from Italy Nation
code :222 and Network ID: 88. There is also another network available for registration:
"SI MOBITEL GSM" which is a network from Slovenia Nation Code:293 and Network ID: 41 ,
"SI.MOBIL" which is a network from Slovenia Nation Code:293 and Network ID: 40 and
Vodafone IT from Italy with Nation code 22 and Network 10.
The other network is not available for registration:
" I TIM " from Italy Nation code :222 and Network ID: 01 - FORBIDDEN
TIP: In this case a "I WIND" logo might be reproduced on the MMI to give the user the
information that is registered on that network.
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NOTE: this command issues a network request and it may require a quite long time to respond,
since the device has to wait the answer from the network (it can be as long as 60 seconds).
Hence don't use it if not needed.
2.5.3.3 Check for received signal strength & quality
Once the mobile has registered on one network, it may be useful to know the received signal strength
& quality to give the user an indication of the reliability of the network.
•
•
send command AT+CSQ<cr>
wait for response in the format:
+CSQ: <rssi>,<ber>
OK
where:
<rssi> is an integer from 0 to 99 that indicates the received signal strength:
<rssi> value Signal strength
0
-113 dBm or less
1
-111 dBm
2
-109 dBm
3
-107 dBm
4
-105 dBm
5
-103 dBm
6
-101 dBm
7
-99 dBm
8
-97 dBm
9
-95 dBm
10
-93 dBm
11
-91 dBm
12
-89 dBm
13
-87 dBm
14
-85 dBm
15
-83 dBm
16
-81 dBm
17
-79 dBm
18
-77 dBm
19
-75 dBm
20
-73 dBm
21
-71 dBm
22
-69 dBm
23
-67 dBm
24
-65 dBm
25
-63 dBm
26
-61 dBm
Indication
Signal is VERY low: at the extreme sensibility limit
MMI may indicate only 1 antenna bar
MMI may indicate only 1 antenna bar
MMI may indicate only 1 antenna bar
MMI may indicate only 1 antenna bar
MMI may indicate only 1 antenna bar
MMI may indicate 2 antenna bars
MMI may indicate 2 antenna bars
MMI may indicate 2 antenna bars
MMI may indicate 2 antenna bars
MMI may indicate 3 antenna bars
MMI may indicate 3 antenna bars
MMI may indicate 3 antenna bars
MMI may indicate 3 antenna bars
MMI may indicate 3 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
MMI may indicate 4 antenna bars
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27
28
29
30
31
99
GM862-GPS Software User Guide
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-59 dBm
MMI may indicate 4 antenna bars
-57 dBm
MMI may indicate 4 antenna bars
-55 dBm
MMI may indicate 4 antenna bars
-53 dBm
MMI may indicate 4 antenna bars
-51 dBm or more MMI may indicate 4 antenna bars
not detected
MMI may indicate flashing antenna bars
NOTE: when <rssi> is less than 6, only 1 MMI antenna bar, the quality of a call will be poor and
the call may even drop.
<ber> is an integer from 0 to 7 and 99 that reports the received signal quality measured on the radio
traffic channel.
NOTE: The quality is measured on the traffic channel, hence it is available only during a
conversation, in Idle the reported value must not be considered.
In conversation the quality decreases with the increase of the <ber> number.
NOTE: The <ber> value refers strictly to the GSM radio channel and is a very technical
parameter, it can be used to monitor the voice call quality since the voice quality is inversely
proportional to the <ber> number.
NOTE: For Data calls the signal quality reported is not directly connected to the connection
quality. The reported signal quality refers only to the GSM radio channel link and not to the
whole path from the caller to the receiver, so it may happen that the quality on the GSM radio
link is very good and hence the reported <ber> is 0 (good quality) but the quality of the
remaining path to the other party is very bad and hence the final data connection quality is
very poor.
For this reason the signal quality indicator <ber> should not be taken into account to monitor
data calls quality.
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2.5.3.4 Quick Network Status Checking
Once the mobile has registered on one network, it may be useful to know the received signal strength
and the network on which the mobile is registered. These information can be gathered with the
commands +CREG, +COPS and +CSQ, which are part of the standard ETSI GSM 07.07 commands
as seen before, unfortunately these commands are not so fast in the response due to network
response time, especially the +COPS command. If You want to keep your software as general as
possible you can follow the indications given before and forget this part; instead if you need or want a
faster way to check at the mobile network information, the GM862-GPS provides a special command
#MONI which can be used to gather all the information needed in a faster and simpler way:
•
•
send command AT#MONI=0<cr>
•
•
send command AT#MONI?<cr>
wait for OK response
wait for response in the format:
#MONI: <netname> BSIC:<bsic> RxQual:<qual> LAC:<lac> Id:<id> ARFCN:<arfcn>
PWR:<dBm> dBmTA: <timadv>
OK
or in the case the network name is not known:
#MONI: Cc:<cc> Nc:<nc> BSIC:<bsic> RxQual:<qual> LAC:<lac> Id:<id> ARFCN:<arfcn>
PWR:<dBm> dBm TA: <timadv>
OK
where:
<netname> = name of network operator
<cc> = country code
<nc> = network operator code
<n> = progressive number of adjacent cell
<bsic> = base station identification code
<qual> = quality of reception (0-7) (same as <ber> of +CSQ command)
<lac> = localization area code
<id> = cell identifier
<arfcn> = assigned radio frequency channel
<dBm> = received signal strength in dBm (same as "decoded" rssi value)
<timadv> = timing advance
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For example:
command:
AT#MONI=0<cr>
Answer:
OK
command:
AT#MONI?<cr>
Answer:
#MONI: I TIM BSIC:23 RxQual:7 LAC:AEAD Id:5265 ARFCN: 59 PWR: -80 dBm TA:0
OK
In this case the mobile is registered on the network "I TIM", the signal strength is -80dBm (MMI may
indicate 4 antenna bars as reported on the table 5). The other information received is strictly technical
and should not be given to the user.
For example2:
command:
AT#MONI=0<cr>
Answer:
OK
command:
AT#MONI?<cr>
Answer:
#MONI: Cc: 010 Nc: 03 BSIC:23 RxQual:7 LAC:0001 Id:0001 ARFCN: 60 PWR: -83 dBm TA:0
OK
In this case the mobile is registered on the network whose Country code is 010 and Network operator
code is 03, the signal strength is -83dBm (MMI may indicate 4 antenna bars as reported on the table
5). The other information received is strictly technical and should not be given to the user.
The values reported are random and have no meaning they are used only to explain command usage.
NOTE: This command should be used only to gather information on network name and signal
strength, to check if mobile is registered or is looking for a suitable network to register to, use
always the +CREG command. This is due to the fact that if the network signal is too weak and
mobile looses the registration, until a new network is found the #MONI command reports the
last measured valid values and not the real ones.
The TA (timing advance parameter) is valid only during a call.
TIP: To properly use this feature, check network registration with command +CREG as seen on
par. 2.5.3.1 and when mobile is registered query the mobile for network operator name and
signal strength with #MONI command.
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2.6 Placing a Voice call
Before a voice call can be placed, it is recommended to check if the mobile is registered on a network
(see par. 2.5.3.1) and if the signal strength is enough to ensure a call can be made (see par. 2.5.3.2).
2.6.1 Voice call device set up
2.6.1.1 Set the device in voice mode
• Send command AT+FCLASS=8<cr>
• wait for OK response
NOTE: This command may be omitted if the modifier ";" is added at the end of the ATD command
after the number to be dialed.
2.6.1.2 Set the desired audio path active
The GM862-GPS has two different audio paths:
- internal microphone/ear (MT)
- external microphone/ear (HF)
Usually the internal path is used for a handset function, while the external is used for handsfree
function. There are two way to switch between these two paths:
- SOFTWARE: by using the command AT#CAP= <n> (with n=1 OR n=2)
- HARDWARE: by setting AT#CAP=0 and setting the AXE input high (internal MT) or low (external
HF).
If only one path is needed, then it is preferable to use the internal one (MT).
TIP: when Hardware control is not needed AXE pin can be left unconnected.
TIP: the audio paths can be switched also during a call in both ways.
• Send command AT#CAP=<n><cr>
where:
<n> = 0 for HARDWARE control with AXE input
<n> = 1 for external HF path (regardless of the AXE input status)
<n> = 2 for internal MT path (regardless of the AXE input status)
•
wait for OK response
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For example:
1 - Let's assume that the desired audio path is always the internal MT
Command:
AT#CAP=2<cr>
Answer:
OK
2 - Let's assume that the desired audio path has to be determined by HARDWARE pin AXE
Command:
AT#CAP=0<cr>
Answer:
OK
Now set the hardware pin AXE in the desired status.
2.6.1.3 Set the desired volume on the active audio path speaker output
This setting is not strictly necessary; it is also possible to keep the default volume setting.
• Send command AT+CLVL=<vol><cr>
where:
<vol> is a number between 0 and 10 representing the volume setting:
0 – minimum volume
10 - maximum volume
•
wait for OK response
NOTE: The volume setting refers to the ACTIVE path ear line and is stored each time. When
changing audio path the volume setting will be reset to the previously stored value for that
audio path.
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2.6.1.4 Check for microphone mute setting
The microphone of the active path can be muted with an AT command; to be sure that it is not muted,
it is suggested to check it with this command:
• Send command AT+CMUT?<cr>
•
wait for response in the format:
+CMUT: <mute>
OK
where:
<mute> is the muting setting for the microphone:
0 - microphone active
1 - microphone muted
NOTE: The mute setting is different from Volume setting: it refers to both the audio paths, the
mute setting will remain even when changing audio path.
2.6.2 Phone number dialing
2.6.2.1 Dial a given phone number
• Send command ATD <PhoneNumber><cr>
where:
<PhoneNumber> is the phone number to be dialed
•
wait for response:
Response
OK
BUSY
NO ANSWER
NO CARRIER
Reason
The call has been placed
Action
Wait for the other party to lift
the receiver..
The line called is busy
retry later
The receiver did not answer the retry later
call
Call placing has not been
check for mobile registration
successful
and signal strength (par. 0)
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For example:
1- Let's assume you have to call the national number 040 - 4192111,
command:
ATD 0404192111<cr>
response
OK
2- Let's assume you have to call the national number but in international format +39-40-4192111,
command:
ATD +39404192111<cr>
response
OK
3- Let's assume you have to call the international number +386-40-4192111 without previously setting
the +FCLASS=8 (voice),
command:
ATD +386404192111;<cr>
response
OK
2.6.3 Closing the voice call
2.6.3.1 Hang up the voice call
•
•
Send command ATH<cr>
wait for response OK
TIP: during the voice call the device remains in command mode, so the escape sequence (+++)
must not be issued before sending commands.
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2.7 Placing a CSD Data call (not GPRS)
Before a data call can be placed, it is recommended to check if the mobile is registered on a network
(see par. 2.5.3.1) and if the signal strength is enough to ensure that a call can be made (see par.
2.5.3.2).
2.7.1 Data call device set up
2.7.1.1 Set the device in data mode
• Send command AT+FCLASS=0<cr>
• wait for OK response
TIP: The +FCLASS setting is maintained in memory, so there's no need to repeat this command
if +FCLASS setting is not changed.
2.7.1.2 Set the desired modulation and speed for the connection
The data connection can be made using different modulations at different speeds.
This connection mode can be selected with the command +CBST. The syntax for the command is:
AT+CBST=<mod>,0,<ce>
These parameters can be selected as seen in the table:
Command
AT+CBST==0, 0, 1
AT+CBST==1, 0, 1
AT+CBST==2, 0, 1
AT+CBST==3, 0, 1
AT+CBST==4, 0, 1
AT+CBST==6, 0, 1
AT+CBST==7, 0, 1
AT+CBST==14, 0, 1
AT+CBST==65, 0, 1
AT+CBST==66, 0, 1
AT+CBST==68, 0, 1
AT+CBST==70, 0, 1
AT+CBST==71, 0, 1
AT+CBST==75, 0, 1
Modulation
Autobauding
V.21
V.22
V.23
V.22Bis
V.32
V.32
V.34
V.110
V.110
V.110 / X.31
V.110 / X.31
V.110 / X.31
V.110 / X.31
Speed
[bps]
---300
1200
1200/75
2400
4800
9600
14400
300
1200
2400
4800
9600
14400
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Connection
Element
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
non transparent
page 23 of 111
AT+CBST==1, 0, 0
AT+CBST==2, 0, 0
AT+CBST==3, 0, 0
AT+CBST==4, 0, 0
AT+CBST==6, 0, 0
AT+CBST==7, 0, 0
AT+CBST==65, 0, 0
AT+CBST==66, 0, 0
AT+CBST==68, 0, 0
AT+CBST==70, 0, 0
AT+CBST==71, 0, 0
V.21
V.22
V.23
V.22Bis
V.32
V.32
V.110
V.110
V.110 / X.31
V.110 / X.31
V.110 / X.31
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300
transparent
1200
transparent
1200/75
transparent
2400
transparent
4800
transparent
9600
transparent
300
transparent
1200
transparent
2400
transparent
4800
transparent
9600
transparent
Once selected the appropriate <mod > and <ce> parameters from the table:
•
•
Send command AT+CBST=<mod>,0,<ce><cr>
wait for OK response
2.7.2 Phone number dialing (data call)
2.7.2.1 Dial a given phone number
• Send command ATD <PhoneNumber><cr>
where:
<PhoneNumber> is the phone number to be dialed
•
wait for response:
Response
CONNECT 9600
BUSY
NO ANSWER
NO CARRIER
Reason
The called modem is now on
line.
The line called is busy
The receiver did not answer the
call
The modem handshaking has
not been successful
Action
exchange data..
retry later
retry later
check for mobile registration
and signal strength and
eventually retry.
TIP: The response to the ATD command is returned after the modem handshaking, this takes
about 30 seconds, so allow this time before doing anything.
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TIP: When the device is doing the handshake the issue of any character closes the handshake
and aborts the call.
For example:
1- Let's assume you have to call the national number 040 - 4192111,
command:
ATD 0404192111<cr>
response
CONNECT 9600
2- Let's assume you have to call the national number but in international format +39-40-4192111,
command:
ATD +39404192111<cr>
response
CONNECT 9600
3- Let's assume you have to call the international number +386-40-4192111,
command:
ATD +386404192111<cr>
response
CONNECT 9600
2.7.3 Closing the Data call
2.7.3.1 Exit the data mode and enter the command mode
•
•
•
Send escape sequence +++
wait the escape sequence pause time ( see S12 parameter)
wait for response OK
NOTE: After the Escape sequence and during the call the only command that is accepted by
the GM862-GPS is the ATH. All the other commands are not supported during a call.
TIP: during the escape sequence pause time S12 no further characters should be sent to the
device in order to enter the command mode.
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2.7.3.2 Hang up the data call
•
•
Send command ATH<cr>
wait for response NO CARRIER
TIP: during the data call the device remains in data (on line) mode, so the escape sequence
(+++) must be issued before sending AT commands to the device.
2.8 Answer an incoming Call
When an incoming call is detected the device reports an unsolicited code which may be:
Unsolicited code
RING
+CRING: VOICE
+CRING: ASYNC
+CRING: REL ASYNC
+CRING: SYNC
+CRING: REL SYNC
+CRING: FAX
Reason
The extended format of incoming call indication is
disabled and a call (voice or data) is incoming.
The extended format of incoming call indication is
enabled and a voice call is incoming.
The extended format of incoming call indication is
enabled and an asynchronous transparent data call
is incoming.
The extended format of incoming call indication is
enabled and an asynchronous reliable (not
transparent) data call is incoming.
The extended format of incoming call indication is
enabled and a synchronous transparent data call is
incoming.
The extended format of incoming call indication is
enabled and a synchronous reliable (not
transparent) data call is incoming.
The extended format of incoming call indication is
enabled and a fax call is incoming.
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To answer the call:
•
Send command
•
wait for response:
ATA<cr>
Response
CONNECT 9600
ERROR
NO CARRIER
OK
Reason
The incoming call was a DATA
one and called modem is now
on line.
No incoming call is found, call
may have been lost
The incoming call was a DATA
one and the modem
handshaking has not been
successful
The incoming call was a VOICE
call and is now active.
Action
exchange data..
call lost
check for mobile registration
and signal strength and modem
settings.
proceed ahead
TIP: The call is answered with the appropriate type (VOICE or DATA) regardless of the
+FCLASS setting active. To distinguish between Data and Voice see the command response or
the extended format incoming call indication.
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3
Advanced Operations
3.1 Accessing the phonebook
The GM862-GPS can access the phonebook storage of the SIM card inserted, by using specific AT
commands it is possible to store and recall phone numbers and their associated name.
3.1.1 Preliminary phonebook set up
The GM862-GPS supports several SIM phonebook storages:
• "SM" - SIM phonebook
This is the PB used to store and recall numbers during the normal operation of the device.
• "FD" - SIM fixed dialing-phonebook (only phase 2/2+ SIM)
This PB has several restrictions; to set it you need the PIN2 code and after having activated
the FD only the calls to the numbers stored in the FD or their children are allowed, all the other
calls are forbidden.
• "LD" - SIM last-dialing-list (+CPBW and +CPBF are not applicable for this storage)
This is the list of the last dialed numbers, it is updated automatically at each call originated and
insertion or search on it is not possible, the only operations allowed are recall, read and delete.
• "MC" - SIM missed-calls-list (+CPBW and +CPBF are not applicable for this storage)
This is the list of the missed calls calling numbers, it is updated automatically at each call
missed and insertion or search on it is not possible, the only operations allowed are recall, read
and delete.
• "RC" - SIM received-calls-list (+CPBW and +CPBF are not applicable for this storage)
This is the list of the received calls calling numbers, it is updated automatically at each call
received and insertion or search on it is not possible, the only operations allowed are recall,
read and delete.
In order to access the storage you have to choose which one will be active. This must be the first PB
operation always. Once selected storage, it is not anymore needed to select it again until the desired
storage remains the one active and the device is not turned off.
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3.1.1.1 Selecting PB storage active
• Send command AT+CPBS=<PB><cr>
where:
<PB> is the desired PB storage:
SM – SIM phonebook
FD – fixed dialing phonebook
LD – last dialed calls list
MC – missed calls list
RC – received calls list
•
wait for response:
Response
OK
ERROR
Reason
selected PB is now active
some error occurred
+CME ERROR: 10
SIM not present
+CMS ERROR: 310
SIM not present
+CME ERROR: 11
+CME ERROR: 13
SIM is present and PIN is
required to continue operations
SIM is present and PIN is
required to continue operations
SIM is present and PUK is
required to continue operations
SIM is present and PUK is
required to continue operations
SIM defect
+CMS ERROR: 313
SIM defect
+CME ERROR: 14
+CMS ERROR: 314
+CME ERROR: 15
SIM is busy
SIM is busy
SIM is wrong type
+CMS ERROR: 315
SIM is wrong type
+CMS ERROR: 311
+CME ERROR: 12
+CMS ERROR: 316
Action
Proceed ahead
Enable extended result codes
(see par. 2.5.2.1)
and retry.
Check SIM or require SIM
insertion and repeat from par.
2.5.2.2
Check SIM or require SIM
insertion and repeat from par.
2.5.2.2
insert SIM PIN (see par.
2.5.2.3)
insert SIM PIN (see par.
2.5.2.3)
insert SIM PUK (see
par.2.5.2.4)
insert SIM PUK (see
par.2.5.2.4)
Check SIM insertion or require
a new SIM not defected and
repeat from par. 2.5.2.2
Check SIM insertion or require
a new SIM not defected and
repeat from par. 2.5.2.2
retry later
retry later
Check SIM, it must be a GSM
SIM.
Check SIM, it must be a GSM
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+CME ERROR: 17
PIN2 is required to continue
operations, since FD facility is
not enabled.
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SIM.
Enable FD facility with +CLCK
(see par.3.1.1.2)
and retry.
NOTE: After power up & PIN authentication the device reads all the SIM for a backup, hence
SIM access is inhibited (SIM is busy after the issue of the PIN or after power up if PIN request
is disabled) for a time varying from few seconds to about a minute, depending on the
percentage of written records in the SIM phonebook. If Phonebook commands are issued
during this time the device returns an error message. If this happens, retry the operations later.
NOTE: Due to the particular features of the FD storage, when selecting the FD storage, the
PIN2 must have been inserted or the FD facility must have been enabled.
If +CPBS command reports +CME ERROR: 17 then enable the facility with command +CLCK
(see par. 3.1.1.2)
For example:
1- Let's assume you want to select the "SM" normal phonebook for operations,
command:
AT+CPBS="SM"<cr>
response
OK
2- Let's assume you want to select the "MC" missed calls list for operations,
command:
AT+CPBS="MC"<cr>
response
OK
3.1.1.2 Enable Fixed Dialing Phonebook facility (only for FD PB)
• Send command AT+CLCK=FD,1,<PIN2><cr>
where:
<PIN2> is the PIN2 code of the SIM.
•
wait for response:
Response
OK
Reason
FD facility is now enabled
ERROR
some error occurred
Action
Return to select PB (see par.
3.1.1.1)
Enable extended result codes
(see par. 2.5.2.1), check if the
PIN2 is correct
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+CME ERROR: 16
the inserted PIN2 is wrong
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and retry.
Check PIN2 code and retry.
NOTE: When receiving the ERROR or +CME ERROR message, repeat Query SIM presence and
status since after 3 failed attempts SIM PIN2 is not anymore requested, but SIM PUK2 is
requested instead, hence you may need to go through procedure 2.5.2.4 (but insert PUK2
instead of PUK1)
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3.1.2 Phonebook entry search by Name
As first thing, you must select the "SM" storage as active (see par.3.1.1.1).
•
send command AT+CPBF=<Name><cr>
where:
<Name> is the desired string to be found in the name field of the PB record.
•
wait for response in the format:
+CPBF= <index>,"<number>",<type>,"<name>"
OK
where:
<index> is the record number on the PB;
<Number> is the phone number;
<type> is the type of number:
145 – international numbering scheme
129 – national numbering scheme
<Name> is the alphanumeric name associated with the number.
or in the case no corresponding entries are found:
+CME ERROR: 22 or simply ERROR.
NOTE: The search for <name> string is not case sensitive and the string may or may not be
included in double brackets.
For example:
1- Let's assume you want to select the "SM" normal phonebook for operations,
command:
AT+CPBS="SM"<cr>
response
OK
- Now you might want to look for the entries with the name starting with: "FA"
command:
AT+CPBF="FA"<cr>
the response may look like:
+CPBF= 7,"+39404192369",145,"Fabio"
+CPBF= 9,"0404192111",129,"Fabrizio"
OK
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- Now you might want to look for the entries with the name starting with: "FAUSTO" but no record
contains this name:
command:
AT+CPBF="FAUSTO"<cr>
response:
+CME ERROR: 22
or if extended error codes are disabled simply
response:
ERROR
3.1.3 Phonebook entry read by Index
As first thing, you must select the desired storage as active (see par.3.1.1.1). Then:
•
send command AT+CPBR=<index><cr>
where:
<index> is the index number of the desired PB record to be read.
•
wait for response in the format:
+CPBR= <index>,"<number>",<type>,"<name>"
OK
where:
<index> is the record number on the PB;
<Number> is the phone number;
<type> is the type of number:
145 – international numbering scheme
129 – national numbering scheme
<Name> is the alphanumeric name associated with the number.
or in the case the index number does not correspond to a written record:
+CME ERROR: 22 or simply ERROR.
For example:
1- Let's assume you want to select the "SM" normal phonebook for operations,
command:
AT+CPBS="SM"<cr>
response
OK
- Now you might want to look for the entry at the position index = 7
command:
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AT+CPBR=7<cr>
the response may look like:
+CPBR= 7,"+39404192369",145,"Fabio"
OK
- Now you might want to look for the entries at the positions from 7 to 9 and for example the position at
index 8 is empty
command:
AT+CPBR=7,9<cr>
the response may look like:
+CPBR= 7,"+39404192369",145,"Fabio"
+CPBR= 9,"0404192111",129,"Fabrizio"
OK
3.1.4 Phonebook entry Write
As first thing, you must select the desired storage as active (see par.3.1.1.1). Then:
•
send command AT+CPBW=<index>,<number>,<type>,<name><cr>
where:
<index> is the index number of the desired PB record to be written (may be omitted if any
empty record number can be used).
<Number> is the phone number;
<type> is the type of number:
145 – international numbering scheme (contains the character "+")
129 – national numbering scheme
<Name> is the alphanumeric name associated with the number.
•
wait for response:
Response
ERROR
Reason
Record has been successfully
written
some error occurred
+CME ERROR: 10
SIM not present
+CMS ERROR: 310
SIM not present
OK
Action
Proceed ahead
Enable extended result codes
(see par. 2.5.2.1), and retry.
Check SIM or require SIM
insertion and repeat from par.
2.5.2.2
Check SIM or require SIM
insertion and repeat from par.
2.5.2.2
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+CME ERROR: 11
+CME ERROR: 13
SIM is present and PIN is
required to continue operations
SIM is present and PIN is
required to continue operations
SIM is present and PUK is
required to continue operations
SIM is present and PUK is
required to continue operations
SIM defect
+CMS ERROR: 313
SIM defect
+CME ERROR: 14
+CMS ERROR: 314
+CME ERROR: 15
SIM is busy
SIM is busy
SIM is wrong type
+CMS ERROR: 315
SIM is wrong type
+CME ERROR: 21
invalid index
+CME ERROR: 20
+CMS ERROR: 322
memory full
memory full
+CMS ERROR: 311
+CME ERROR: 12
+CMS ERROR: 316
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insert SIM PIN (see par.
2.5.2.3)
insert SIM PIN (see par.
2.5.2.3)
insert SIM PUK (see
par.2.5.2.4)
insert SIM PUK (see
par.2.5.2.4)
Check SIM insertion or require
a new SIM not defected and
repeat from par. 2.5.2.2
Check SIM insertion or require
a new SIM not defected and
repeat from par. 2.5.2.2
retry later
retry later
Check SIM, it must be a GSM
SIM.
Check SIM, it must be a GSM
SIM.
Change index number or leave
it empty and retry.
PB storage is full.
PB storage is full.
For example:
1- Let's assume you want to select the "SM" normal phonebook for operations,
command:
AT+CPBS="SM"<cr>
response
OK
- Now you might want to write a new record on the PB:
command:
AT+CPBW=,"0404192123",129,"NewRecord"<cr>
response:
OK
-Now you may want to check if operation has really succeeded and where the new record has been
written. (obviously operation was successful, since the device returned OK)
command:
AT+CPBF="NEW"<cr>
response:
+CPBF= 8,"0404192123",129,"NewRecord"
OK
The new record was written at the position index 8. (The first free record index found).
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3.1.5 Phonebook entry Delete
As first thing, the desired storage must be active (see par.3.1.1.1). Then:
•
send command AT+CPBW=<index><cr>
where:
<index> is the index number of the desired PB record to be deleted.
•
wait for response:
Response
OK
ERROR
+CME ERROR: 21
Reason
Record has been successfully
deleted
some error occurred
+CME ERROR: 10
invalid index, out of PB storage
limits
SIM not present
+CMS ERROR: 310
SIM not present
+CME ERROR: 11
+CME ERROR: 13
SIM is present and PIN is
required to continue operations
SIM is present and PIN is
required to continue operations
SIM is present and PUK is
required to continue operations
SIM is present and PUK is
required to continue operations
SIM defect
+CMS ERROR: 313
SIM defect
+CME ERROR: 14
+CMS ERROR: 314
+CME ERROR: 15
SIM is busy
SIM is busy
SIM is wrong type
+CMS ERROR: 315
SIM is wrong type
+CMS ERROR: 311
+CME ERROR: 12
+CMS ERROR: 316
Action
proceed ahead
Enable extended result codes
(see par. 2.5.2.1), and retry.
check index number and retry.
Check SIM or require SIM
insertion and repeat from par.
2.5.2.2
Check SIM or require SIM
insertion and repeat from par.
2.5.2.2
insert SIM PIN (see par.
2.5.2.3)
insert SIM PIN (see par.
2.5.2.3)
insert SIM PUK (see
par.2.5.2.4)
insert SIM PUK (see
par.2.5.2.4)
Check SIM insertion or require
a new SIM not defected and
repeat from par. 2.5.2.2
Check SIM insertion or require
a new SIM not defected and
repeat from par. 2.5.2.2
retry later
retry later
Check SIM, it must be a GSM
SIM.
Check SIM, it must be a GSM
SIM.
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TIP: The delete operation simply overwrites the record number <index> with an empty record.
If the record to be deleted was already empty, no error messages will be shown, but it will be
only filled again with empty values.
3.1.6 Phonebook entry Dial
You may want to dial a number previously stored in the phonebook. As first thing, you must find the
desired phone number index position, to do it use the +CPBF command. Once the <index> number is
known set up the device for the type of call you want to dial. Then:
•
send command ATD> <index><cr>
where:
<index> is the index number of the desired PB record to be dialed.
wait for response according to the call type you issued.
For example:
1- Let's assume you want to make a Voice call on the internal audio path MT to "Fabio" whose number
is stored on the SIM PB:
- Select the PB as active storage
command:
AT+CPBS="SM"<cr>
response
OK
- Now find the index number where "Fabio" is recorded:
command:
AT+CPBF="Fabio"<cr>
the response may look like:
+CPBF= 7,"+39404192369",145,"Fabio"
OK
- the first field is the index position: 7 in this case.
- Now set up Voice call:
command:
AT+FCLASS=8<cr>
response:
OK
AT#CAP=2 <cr>
OK
AT+CLVL=8<cr>
OK
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AT+CMUT? <cr>
+CMUT: 0
- and Dial:
ATD> 7<cr>
OK
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3.2 Distinguish Calls
3.2.1 Identify the Call type
The GM862-GPS is able to identify the call type before answering it, it is so possible to have different
ring indications (unsolicited codes) depending on the call type:
Unsolicited code
RING
+CRING: VOICE
+CRING: ASYNC
+CRING: SYNC
+CRING: REL ASYNC
+CRING: REL SYNC
+CRING: FAX
Reason
The extended format of incoming call indication is
disabled and a call (voice or data) is incoming.
The extended format of incoming call indication is
enabled and a voice call is incoming.
The extended format of incoming call indication is
enabled and an asynchronous transparent data call
is incoming.
The extended format of incoming call indication is
enabled and a synchronous transparent data call is
incoming.
The extended format of incoming call indication is
enabled and an asynchronous not transparent data
call is incoming.
The extended format of incoming call indication is
enabled and a synchronous not transparent data
call is incoming.
The extended format of incoming call indication is
enabled and a fax call is incoming.
In order to use this feature you must enable the extended format of incoming calls
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3.2.1.1 Set the extended incoming call indication
•
Send command
AT+CRC=<n><cr>
where:
<n> is the operation mode selected:
0 – extended results Disabled (device reports RING only)
1 – extended results Enabled (device reports +CRING: <type> indication)
• wait for OK response
3.2.2 Identify the Caller
The GM862-GPS is able to identify the caller number and give indication of it before the call is
answered.
The calling number is presented after each RING or +CRING indication in the format:
+CLIP: "<number>",<type>[,"<subaddress>",<satype>[,"<alpha>"[,<CLI validity>]]]
OK
where:
<Number> is the phone number;
<type> is the type of number:
145 – international numbering scheme
129 – national numbering scheme
<subaddress> is the subaddress of the calling party
<satype> is the type of subaddress
<alpha> is an optional string type alphanumeric representation of <number> corresponding to
the entry found in phonebook;
<CLI validity> is the validity status of CLI presentation:
0 CLI valid.
1 CLI has been withheld by the originator.
2 CLI is not available due to interworking problems or limitation or originating
network.
In order to use this feature you must enable the caller ID indication presentation, if feature is disabled
then no CLI indication is given after the RING or +CRING code.
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3.2.2.1 Set Caller line ID indication presentation
•
Send command
AT+CLIP=<n><cr>
where:
<n> is the operation mode selected:
0 – Calling Line Indication Presentation Disabled
1 – Calling Line Indication Presentation Enabled
• wait for OK response
For example:
1- Let's assume you receive a call from the national number 1234567890 and extended incoming calls
indication is disabled while CLIP is enabled, you'll see:
ring indication:
RING
+CLIP: "1234567890",129
2- Let's assume you receive a call from the international number +391234567890 and extended
incoming calls indication is disabled while CLIP is enabled, you'll see:
ring indication:
RING
+CLIP: "+391234567890",145
NOTE: this does not mean that the incoming call is an international one, it simply means that the
numbering scheme used to identify the caller is the international one.
3.2.3 Restricting Calling Line Indication
The GM862-GPS is able to send the calling line indication (CLI) to the other party through the network
when an outgoing call is made. This indication can be restricted (CLIR) in various ways:
• CLI sent always
• CLI never sent
• CLI temporary sent (normally not sent)
• CLI temporary not sent (normally sent)
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3.2.3.1 CLIR Service status query
•
•
send command AT+CLIR?<cr>
wait for response in the format:
+CLIR: <n>,<m>
OK
where:
<n> is the facility status on the Mobile
0 – CLIR facility according to CLIR service network status
1 – CLIR facility active (CLI not sent)
2 – CLIR facility not active (CLI sent)
<m> is the facility status on the Network
0 - CLIR service not provisioned (service unavailable)
1 - CLIR service provisioned (service available)
2 - unknown (e.g. no network present, etc.)
3 - CLI temporary mode presentation restricted
4 - CLI temporary mode presentation allowed
NOTE: The <m> parameter reports the status of the service at network level.
If the CLIR service is not provisioned, then it is not possible to use this service and changing
the first parameter <n> will not change the CLI presentation to the other party behavior of the
network.
For example:
1- Let's assume you want to check your CLIR settings:
command:
AT+CLIR? <cr>
response:
+CLIR: 2,4
In this case the CLIR service is temporary mode allowed on the network and the mobile sends the CLI
when calling. (CLI Restriction not active).
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3.2.3.2 Restrict/Allow Caller line ID indication
•
Send command
AT+CLIR=<n><cr>
where:
<n> is the operation mode selected:
0 – Calling Line Indication to the other party According to Network service status.
1 – Calling Line Indication Restriction Enabled (CLI not sent)
2 – Calling Line Indication Restriction Disabled (CLI sent)
•
wait for OK response
For example:
1- Let's assume you want to disable the CLI presentation to the other party permanently:
command:
AT+CLIR=1<cr>
response:
OK
3.2.4 Call Barring Control
The call Barring is a GSM service that allows the user to block certain types of calls:
• Barring All Outgoing Calls
• Barring Outgoing International Calls
• Barring Outgoing International Calls except to Home Country
• Barring All Incoming Calls
• Barring Incoming Calls when Roaming outside the home country
• All Barring services (applicable only for disabling command)
• All Outgoing barring services (applicable only for disabling command)
• All Incoming barring services (applicable only for disabling command)
The service can be queried, enabled and disabled.
NOTE: The call Barring service is handled by the network, hence all the relative commands
issue a network request and it may take several seconds to have the response from the
network.
Furthermore, all the Call Barring service commands must be issued when the mobile is
Registered on some Network, else an error code is returned ( no network service ).
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3.2.4.1 Call Barring Service status query
•
send command AT+CLCK=<fac>,2<cr>
where:
<fac> is the facility to be queried:
AO - Barring All Outgoing Calls
OI - Barring Outgoing International Calls
OX- Barring Outgoing International Calls except to Home Country
AI - Barring All Incoming Calls
IR - Barring Incoming Calls when Roaming outside the home country
AB - All Barring services (applicable only for disabling command)
AG - All Outgoing barring services (applicable only for disabling command)
AC - All Incoming barring services (applicable only for disabling command)
•
wait for response:
Response
+CLCK: 0
+CLCK: 1
+CME ERROR: 4
+CME ERROR: 30
Reason
facility is disabled
facility is enabled
operation not supported, the
service required is not available
no network service
Action
calls are allowed
calls are barred
Check command syntax and
service code
Check for registration (see par.
2.5.3.1) and signal strength.
NOTE: The call Barring service is handled by the network, hence all the relative commands
issue a network request and it may take several seconds to have the response from the
network.
Furthermore all the Barring service commands must be issued when the mobile is Registered
on some Network, else an error code is returned ( no network service ).
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For example:
1- Let's assume you want to check whether the incoming calls when roaming outside Home Country
are barred or not:
command:
AT+CLCK=IR,2<cr>
response:
+CLCK: 0
In this case, the incoming (received) calls ARE NOT BARRED when in Roaming outside the Home
Country.
2- Let's assume you want to check whether the Outgoing (originated) international calls are barred or
not:
command:
AT+CLCK=OI,2<cr>
response:
+CLCK: 1
In this case, the outgoing international calls ARE BARRED.
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3.2.4.2 Barring/Unbarring All Incoming Calls
•
Send command
AT+CLCK=AI,<en>,<pwd><cr>
where:
<en> is the operation selected:
0 – Call Barring Disable (Unbarring)
1 – Call Barring Enable (Barring)
<pwd> is the network password required to change facility status
•
wait for response:
Response
OK
ERROR
+CME ERROR: 4
+CME ERROR: 30
+CME ERROR: 16
Reason
Action
Barring is now enabled/disabled all incoming calls will be
barred/unbarred
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
operation not supported, the
Check command syntax
service required is not available
no network service
Check for registration (see par.
2.5.3.1) and signal strength.
wrong network password
check network password and
retry
For example:
1- Let's assume you want to bar all the incoming calls and the network password of your operator is
0000:
command:
AT+CLCK=AI,1,0000<cr>
response:
OK
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3.2.4.3 Barring/Unbarring Incoming Calls when in International Roaming
•
Send command
AT+CLCK=IR,<en>,<pwd><cr>
where:
<en> is the operation selected:
0 – Call Barring Disable (Unbarring)
1 – Call Barring Enable (Barring)
<pwd> is the network password required to change facility status
•
wait for response:
Response
OK
ERROR
+CME ERROR: 4
+CME ERROR: 30
+CME ERROR: 16
Reason
Action
Barring is now enabled/disabled all incoming calls when is
international Roaming will be
barred/unbarred
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
operation not supported, the
Check command syntax
service required is not available
no network service
Check for registration (see par.
2.5.3.1) and signal strength.
wrong network password
check network password and
retry
For example:
1- Let's assume you want to bar all the incoming calls when the mobile is roaming outside its home
country and the network password of your operator is 0000:
command:
AT+CLCK=IR,1,0000<cr>
response:
OK
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3.2.4.4 Barring/Unbarring All Outgoing Calls
•
Send command
AT+CLCK=AO,<en>,<pwd><cr>
where:
<en> is the operation selected:
0 – Call Barring Disable (Unbarring)
1 – Call Barring Enable (Barring)
<pwd> is the network password required to change facility status
•
wait for response:
Response
OK
ERROR
+CME ERROR: 4
+CME ERROR: 30
+CME ERROR: 16
Reason
Action
Barring is now enabled/disabled all outgoing calls will be
barred/unbarred
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
operation not supported, the
Check command syntax
service required is not available
no network service
Check for registration (see par.
2.5.3.1) and signal strength.
wrong network password
check network password and
retry
For example:
1- Let's assume you want to bar all the outgoing calls (originated by mobile) and the network password
of your operator is 0000:
command:
AT+CLCK=AO,1,0000<cr>
response:
OK
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3.2.4.5 Barring/Unbarring All Outgoing International Calls
•
Send command
AT+CLCK=OI,<en>,<pwd><cr>
where:
<en> is the operation selected:
0 – Call Barring Disable (Unbarring)
1 – Call Barring Enable (Barring)
<pwd> is the network password required to change facility status
•
wait for response:
Response
OK
ERROR
+CME ERROR: 4
+CME ERROR: 30
+CME ERROR: 16
Reason
Action
Barring is now enabled/disabled all outgoing international calls
will be barred/unbarred
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
operation not supported, the
Check command syntax
service required is not available
no network service
Check for registration (see par.
2.5.3.1) and signal strength.
wrong network password
check network password and
retry
For example:
1- Let's assume you want to bar all the outgoing international calls (originated by mobile and to a
number outside the home country of the mobile) and the network password of your operator is 1234:
command:
AT+CLCK=OI,1,1234<cr>
response:
OK
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3.2.4.6 Barring/Unbarring All Outgoing International Calls except to Home
Country
•
Send command
AT+CLCK=OX,<en>,<pwd><cr>
where:
<en> is the operation selected:
0 – Call Barring Disable (Unbarring)
1 – Call Barring Enable (Barring)
<pwd> is the network password required to change facility status
•
wait for response:
Response
OK
ERROR
+CME ERROR: 4
+CME ERROR: 30
+CME ERROR: 16
Reason
Action
Barring is now enabled/disabled all outgoing international calls
except to Home Country will be
barred/unbarred
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
operation not supported, the
Check command syntax
service required is not available
no network service
Check for registration (see par.
2.5.3.1) and signal strength.
wrong network password
check network password and
retry
For example:
1- Let's assume you want to bar all the outgoing international calls except the ones towards the Home
Country and the network password of your operator is 1234:
command:
AT+CLCK=OX,1,1234<cr>
response:
OK
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3.2.4.7 Unbarring all the Calls
•
Send command
AT+CLCK=AB,0,<pwd><cr>
where:
<pwd> is the network password required to change facility status
•
wait for response:
OK
Response
Reason
Barring is now disabled
ERROR
some error occurred
+CME ERROR: 4
operation not supported, the
service required is not available
no network service
Check for registration (see par.
2.5.3.1) and signal strength.
wrong network password
check network password and
retry
+CME ERROR: 30
+CME ERROR: 16
Action
all calls will be allowed
(unbarred)
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
Check command syntax
For example:
1- Let's assume you want to disable all the barring services you might have previously activated and
the network password of your operator is 0000:
command:
AT+CLCK=AB,0,0000<cr>
response:
OK
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3.3 DTMF tones
DTMF tones are managed by specific AT commands. These tones are generated with AT commands
only during voice calls. The minimum duration of a DTMF tone can be set on 10 ms but it should be
considered that this value can vary with the limitations on network.
Group high
Group low
1209 Hz
1336 Hz
1477 Hz
697 Hz
1
2
3
770 Hz
852 Hz
4
7
5
8
6
9
941 Hz
*
0
#
NOTE: The GSM system architecture defines that the audio signal of the DTMF tones is inserted by
the network switches on commands sent by the Mobile Station (MS). Thus, the default duration
parameters may vary from network to network. In case that the devices to be controlled by DTMF are
sensitive related to the duration of the tones and timing of the sequences, dedicated investigations on
the parameter settings have to be made.
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3.4 GSM Power Saving function
The Telit GM862-GPS has a special function that reduces the power consumption during the idle time,
thus allowing a longer standby time with a given battery capacity.
This function monitors the DTR line indicating that the OEM application is ready to send commands,
when it goes high (3V on UART) then the OEM application is not going to send any commands and
the GM862-GPS module can save energy by shutting down its internal serial port.
When the OEM application becomes again ready, then the line DTR is tied low (0V on UART); the
GM862-GPS detects this condition and powers up the serial port.
If the power saving function is activated, then the serial port must support the DTR line since when this
line is high (Data Terminal is NOT ready) the device goes into a sleep condition and will not respond
to commands until the DTR is tied low (Data Terminal is ready).
NOTE: The power saving function does not affect the network behavior of the GM862-GPS,
even during the power save condition the module remains registered on the network and
reachable for incoming calls or SMS. If a call income during the power save, then the module
will wake up and proceed normally with the unsolicited incoming call code.
The DTR functionality is usable only when +CFUN=5 is selected.
TIP: When the GM862-GPS wakes up from the sleep mode, it takes a maximum of 150
milliseconds before it can exchange commands on the serial port. Hence place a delay of at
least 150 ms between the port opening (DTR lowering) and command sending.
According to the V24 standard, when the module is not ready to receive commands it will tie
up the CTS line, while it will pull it down when it's ready to receive commands; hence you can
monitor the CTS line to ensure the GM862-GPS is ready for commands.
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3.4.1.1 Enabling/Disabling the power saving function
•
send command AT+CFUN=<fun><cr>
where:
<fun> is the power saving function mode, the supported values are:
0 - minimum functionality, NON-CYCLIC SLEEP mode: in this mode, the AT interface is not
accessible.
1 - mobile full functionality with power saving disabled (factory default)
2 - disable TX
4 - disable both TX and RX
5 - mobile full functionality with power saving enabled
•
wait for response:
Response
OK
ERROR
Reason
The power save is now active
some error occurred
+CME ERROR: 4
operation not supported
Action
Enable extended result codes
(see par. 2.5.2.1), and retry.
Check command syntax and
<fun> value.
TIP: The power saving function is disabled by default when the device starts up, in order to
guarantee that even without the DTR line support it is possible to exchange commands with
the module; for this reason the power saving setting command shall be issued after every
power up.
NOTE: The power saving for GSM part will not be activated if the GPS part is switched on.
The DTR functionality is usable only when +CFUN=5 is selected.
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3.5 SMS handling
The Telit GM862-GPS supports the Short Message Service, it is possible to store, delete, write, send
and receive a SMS, which is a short text message up to 160 characters long.
3.5.1 SMS device setup
Before accessing the Short Message Service, the device has to be properly set up.
3.5.1.1 Select SMS format type
The GM862-GPS supports SMS in two different formats:
• PDU
• Text
The difference is that in the PDU mode the device returns and receives SMS encoded in the format
ready to be sent to the network; in TEXT mode the device converts automatically the read PDU into
text and viceversa. By using TEXT mode the PDU data encoding knowledge is not needed and
operations are easier. For this reason, we will use the TEXT mode to explain how to operate with
SMS. If you are familiar with PDU encoding then you can operate with PDU by selecting that format
and using appropriate command syntax.
• Send command AT+CMGF=<mode><cr>
where:
<mode> is the SMS format type:
0 – PDU
1 – Text
•
wait for response OK
TIP: This setting is stored and remains until the device is turned off. Hence, there's no need to
issue it more than one time. For TEXT mode use <mode>=1.
For example:
1- Let's assume you want to set TEXT format for the SMS:
command:
AT+CMGF=1<cr>
response:
OK
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3.5.1.2 Check SMS Service Centre number
The SMS are sent by the GM862-GPS to a service centre (SMSC) where the message is dispatched
towards its final destination or is kept until the delivery is possible. To ensure a correct behavior of this
service the number of the service centre must be the one your network operator supports.
To check which number is stored as the SMSC:
•
•
send command AT+CSCA?<cr>
wait for response in the format:
+CSCA: <number>,<type>
OK
where:
<number> is the SMSC number
<type> is the SMSC number type:
145 – international numbering scheme (number begins with "+")
129 – national numbering scheme
TIP: This settings remains stored in the SIM card until it is changed or deleted, so this
operation may be done only once if the SIM Card is not changed. The setting is maintained
even after power down.
For example:
1- Let's assume you want to check your SMSC number:
command:
AT+CSCA? <cr>
response:
+CSCA: +393359609600
OK
3.5.1.3 Add SMS Service Centre number (only if required)
If your previously check for SMSC returned an empty field:
+CSCA: ,129
or if the SMSC number stored does not correspond to the desired one, then the new number has to be
stored. In this way the previously stored number will be overwritten.
•
send command AT+CSCA=<number>,<type><cr>
where:
<number> is the desired SMSC number
<type> is the SMSC number type:
145 – international numbering scheme (number begins with "+")
129 – national numbering scheme
•
wait for OK
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For example:
1- Let's assume your desired SMSC number is +39335123456 (stored in international format):
command:
AT+CSCA=+39335123456,145<cr>
response:
OK
3.5.1.4 Select New Messages indication behavior
When the device receives a new message a unsolicited indication is generated, this indication may be
sent to the DTE, buffered if the DTE is busy (for example during a data call) or discarded.
To set the desired behavior:
•
send command AT+CNMI=<mode>,<mt>,<bm>,<ds>,<bfr><cr>
where:
Set command selects the behaviour of the device on how the receiving of new messages from the
network is indicated to the DTE.
Parameter:
<mode> - unsolicited result codes buffering option
0 - Buffer unsolicited result codes in the TA. If TA result code buffer is full, indications can be
buffered in some other place or the oldest indications may be discarded and replaced with the
new received indications.
1 - Discard indication and reject new received message unsolicited result codes when TA-TE link is
reserved, otherwise forward them directly to the TE.
2 - Buffer unsolicited result codes in the TA in case the DTE is busy and flush them to the TE after
reservation. Otherwise forward them directly to the TE.
3 - if <mt> is set to 1 an indication via 100 ms break is issued when a SMS is received while the
module is in GPRS online mode. It enables the hardware ring line for 1 s. too.
<mt> - result code indication reporting for SMS-DELIVER
0 - No SMS-DELIVER indications are routed to the TE.
1 - If SMS-DELIVER is stored into ME/TA, indication of the memory location is routed to the TE using
the following unsolicited result code:
+CMTI: <memr>,<index>
where:
<memr> - memory storage where the new message is stored
"SM"
"ME"
<index> - location on the memory where SM is stored.
2 - SMS-DELIVERs (except class 2 messages and messages in the message waiting indication
group) are routed directly to the TE using the following unsolicited result code:
(PDU Mode)
+CMT: <alpha>,<length><CR><LF><pdu>
where:
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<alpha> - alphanumeric representation of originator/destination number corresponding to the
entry found in MT phonebook
<length> - PDU length
<pdu> - PDU message
(TEXT Mode)
+CMT:<oa>,<alpha>,<scts>[,<tooa>,<fo>,<pid>,<dcs>,
<sca>,<tosca>,<length>]<CR><LF><data> (the information written in italics will be present
depending on +CSDH last setting)
where:
<oa> - originating address, string type converted in the currently selected character set (see
+CSCS)
<alpha> - alphanumeric representation of <oa>; used character set should be the one selected
with either command +CSCS or @CSCS.
<scts> - arrival time of the message to the SC
<tooa>, <tosca> - type of number <oa> or <sca>:
129 - number in national format
145 - number in international format (contains the "+")
<fo> - first octet of GSM 03.40
<pid> - Protocol Identifier
<dcs> - Data Coding Scheme
<sca> - Service Centre address, string type, converted in the currently selected character set
(see +CSCS)
<length> - text length
<data> - TP-User-Data
Class 2 messages and messages in the message waiting indication group (stored message)
result in indication as defined in <mt>=1.
3 - Class 3 SMS-DELIVERs are routed directly to TE using unsolicited result codes defined in
<mt>=2. Messages of other data coding schemes result in indication as defined in <mt>=1.
<bm> - broadcast reporting option
0 - Cell Broadcast Messages are not sent to the DTE
2 - New Cell Broadcast Messages are sent to the DTE with the unsolicited result code:
(PDU Mode)
+CBM: <length><CR><LF><PDU>
where:
<length> - PDU length
<PDU> - message PDU
(TEXT Mode)
+CBM:<sn>,<mid>,<dcs>,<pag>,<pags><CR><LF><data>
where:
<sn> - message serial number
<mid> - message ID
<dcs> - Data Coding Scheme
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<pag> - page number
<pags> - total number of pages of the message
<data> - CBM Content of Message
<ds> - SMS-STATUS-REPORTs reporting option
0 - status report receiving is not reported to the DTE
1 - the status report is sent to the DTE with the following unsolicited result code:
(PDU Mode)
+CDS: <length><CR><LF><PDU>
where:
<length> - PDU length
<PDU> - message PDU
(TEXT Mode)
+CDS: <fo>,<mr>,,,<scts>,<dt>,<st>
where:
<fo> - first octet of the message PDU
<mr> - message reference number
<scts> - arrival time of the message to the SC
<dt> - sending time of the message
<st> - message status as coded in the PDU
2 - if a status report is stored, then the following unsolicited result code is sent:
+CDSI: <memr>,<index>
where:
<memr> - memory storage where the new message is stored
"SM"
<index> - location on the memory where SM is stored
<bfr> - buffered result codes handling method:
0 - TA buffer of unsolicited result codes defined within this command is flushed to the TE when
<mode>=1..3 is entered (OK response shall be given before flushing the codes)
1 - TA buffer of unsolicited result codes defined within this command is cleared when <mode>=1..3
is entered.
NOTE: issuing AT+CNMI<CR> is the same as issuing the Read command.
NOTE: issuing AT+CNMI=<CR> is the same as issuing the command AT+CNMI=0<CR>.
•
wait for OK
TIP: In this command description the values that are always 0 are parameter reserved for future
use, in the current software revision the only value supported is 0.
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For example:
1- Let's assume you want to eliminate all the unsolicited codes that may be sent when receiving SMS
& Status Report:
command:
AT+CNMI= 0,0,0,0,0<cr>
response:
OK
For example about a new message indication:
1- Let's assume you receive a new SMS delivery (AT+CNMI=1,1,0,0,0) and this new message is
stored on the SIM "SM" storage at the location number 7; the unsolicited code you will receive (if code
is enabled) is:
unsolicited code:
+CMTI: "SM",7
2- Let's assume you receive a new SMS Status Report delivery (AT+CNMI=1,0,0,2,0) and this new
message is stored on the SIM "SM" storage at the location number 8; the unsolicited code you will
receive is:
unsolicited code:
+CDSI: "SM",8
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3.5.1.5 Set Text Mode Parameters (only in TEXT mode)
When the device is set to operate with Text SMS not with PDU, the SMS parameters that usually
reside on the header of the PDU must be set apart with the command +CSMP.
The parameters to be set are:
• Message Format
• Validity Period
• Protocol Identifier
• Data Coding Scheme
The meaning and format of the parameters is:
- Message format, like defined for the first octet of message according to GSM 3.40:
The format is an 8-bit parameter divided into 6 fields and then reported as an integer:
b7
RP
b6
UDHI
b5
SRR
b4
b3
VPF
b2
RD
b1
b0
MTI
where
MTI message type parameter:
0 1 - SMS Submit (only value supported)
RD reject duplicates parameter
0 - don't reject duplicates SMS in SC
1 - reject duplicates on SC
VPF validity period format
0 0 - Validity period NOT present
1 0 - VP integer represented (relative)
1 1 - VP semi octet represented (absolute)
0 1 - reserved
SRR status report request
0 - status report not requested
1 - status report requested
UDHI user data Header Information
0 - No Header on PDU
1 - Header present on PDU
RP reply path
0 - RP not set
1 - RP set
- Validity Period numerical if in relative format or string if in absolute format
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This parameter represents the validity period for the SMS after which the message should be
disregarded instead of being delivered.
If in relative format (see VPF parameter) it is an integer:
0 to 143 – corresponding to (VP + 1) x 5 minutes
144 to 167 – corresponding to 12 hours + ((VP -143) x 30 minutes)
168 to 196 – corresponding to (VP - 166) x 1 day
197 to 255 – corresponding to (VP - 192) x 1 week
If in absolute format it is a string in the format:
"gg/MM/YY,hh:mm:ss±tz"
where
gg day of expiration (2 characters)
MM month of expiration (2 characters)
YY year of expiration (2 characters)
hh hour of expiration (2 characters)
mm minute of expiration (2 characters)
ss second of expiration (2 characters)
± sign of the time zone ( + or - )
tz time zone (2 characters)
- Protocol Identifier in numerical format:
This parameter identifies the protocol used by the receiver entity and informs the SC that the
conversion from SMS to that protocol should be done while delivering the message.
Protocol ID
0
33
34
35
36
37
38
39
40
41
42
43
44
45
46-47
48
49
Conversion towards..
Implicit (default)
telex (or teletex reduced to telex
format)
group 3 telefax
group 4 telefax
voice telephone (i.e. conversion to
speech)
ERMES (European Radio Messaging
System)
National Paging system (known to the
SC)
Videotex (T.100/T.101)
teletex, carrier unspecified
teletex, in PSPDN
teletex, in CSPDN
teletex, in analog PSTN
teletex, in digital ISDN
UCI (Universal Computer Interface,
ETSI DE/PS 3 01-3)
(reserved, 2 combinations)
a message handling facility (known to
the SC)
any public X.400-based message
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handling system
Internet Electronic Mail
(reserved, 5 combinations)
values specific to each SC, usage
based on mutual agreement between
the SME and the SC (7 combinations
available for each SC)
A GSM mobile station. The SC
converts the SM from the received TPData-Coding-Scheme to any data
coding scheme supported by that MS
(e.g. the default).
Short Message Type 0
Replace Short Message Type 1
Replace Short Message Type 2
Replace Short Message Type 3
Replace Short Message Type 4
Replace Short Message Type 5
Replace Short Message Type 6
Replace Short Message Type 7
Reserved
Return Call Message
Reserved
SIM Data download
50
51-55
56-62
63
64
65
66
67
68
69
70
71
72..94
95
96..126
127
- Data coding Scheme as defined by GSM 3.38 – in numerical format
The DCS is an 8-bit parameter reported as an integer, the default value is 0, otherwise
for simplicity, we report only the most useful DCS, for further Schemes refer to GSM 3.38
b7
1
b6
1
b5
1
b4
1
b3
0
b2
Alpha
bet
b1
b0
Class
where
Alphabet
0 - default Alphabet
1 - 8 bit
Class
0 0 - Class 0
0 1 - Class 1
1 0 - Class 2
1 1 - Class 3
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TIP: The default value for DCS = 0 represents the default SMS sent by a mobile. If you don't
need any particular data coding scheme use DCS=0.
NOTE: Not all the DCS combinations described in the GSM 3.38 are supported, both by the
network and by the Telit GM862-GPS. Some features may be not implemented at network level
or at device level, resulting in a +CMS ERROR: 303 (operation not supported) result code. If
this happens then use a different DCS.
•
send command AT+CSMP=<fo>,<vp>,<pid>,<dcs><cr>
where:
<fo>: Message format
<vp>: Validity Period
<pid>: Protocol Identifier
<dcs>: Data coding Scheme
•
wait for OK
For example:
1- Let's assume you want to set the SMS parameters to the values:
- Message Format:
- SMS submit
- don't reject duplicates
- VP Format integer (relative)
- status report not requested
- No Header on PDU
- Reply path not set
Hence, the message format is the binary number 00010001 corresponding to the integer 17.
- Validity period 24 hours corresponding to an integer value 167.
12 hours + ((167 -143) x 30 min) = 24 hours
- Protocol ID implicit (SMS sent to a mobile terminal) corresponding to a value 0.
- DCS default value 0.
command:
AT+CSMP= 17,167,0,0
response:
OK
2- Let's assume you want to set the SMS parameters to the values:
- Message Format:
- SMS submit
- don't reject duplicates
- VP Format semi octet (absolute)
- status report requested
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- No Header on PDU
- Reply path not set
Hence, the message format is the binary number 00111001 corresponding to the integer 57.
- Validity period format is absolute, hence it represents the expiration date of the message and the
desired expiration date is for example 29/06/02 at 02:20 in the time zone of Italy (+1).
"29/06/02,02:20:00+1"
- Protocol ID implicit (SMS sent to a mobile terminal) corresponding to a value 0.
- Data Coding Scheme:
- Default Alphabet
- Class 0 (e.g. immediate display SMS)
Corresponding to the binary number 11110000 corresponding to the integer 240.
command:
AT+CSMP= 57,29/06/02,02:20:00+1,0,240
response:
OK
3.5.1.6 Select SMS Memory and check for memory space
There are various types of storage where the SMS can be stored, the Telit GM862-GPS provides two
different storage:
"ME" - mobile equipment memory
"SM" - SIM Card memory
The SMS are usually stored (this is true for both the originated and the received SMS) in the SM
storage, the "ME" storage is a read only one where the Class 0 messages received are stored
(regardless of the selected active storage which may be "SM").
For this reason the "ME" storage can be selected to read the Class 0 messages.
The GM862-GPS allows the user to select a different storage for the read-delete, write-send, and
reception-saving SMS operations.
•
send command AT+CPMS=<memr>,<memw>,<mems><cr>
where:
<memr>: memory storage for Read and Delete commands
- "SM"
- "ME" (No Delete operations allowed)
<memw>: memory storage for Write and Send commands
<mems>: memory storage for new incoming message saving
- "SM" only
• wait for response in the format:
+CPMS:<usedr>,<totalr>,<usedw>,<totalw>,<useds>,<totals>
OK
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where
<usedr> - number of SMS stored into <memr>
<totalr> - max number of SMS that <memr> can contain
<usedw> - number of SMS stored into <memw>
<totalw> max number of SMS that <memw> can contain
<useds> - number of SMS stored into <mems>
<totals> max number of SMS that <mems> can contain
From this response you can check if the selected storage has room for new SMSs, the free positions
in the storage X (where X can be r,w,s ) are <totalX> -<usedX>.
3.5.2 IRA character set
The character set used in SMS text mode is the IRA.
This set defines each char as a 7-bit value, hence from 0x00 to 0x7F. The table below reports all the
chars supported and their hexadecimal code. To obtain the code for a char in the table remember that
in the row it is reported the least significant nibble (4 bits) and in the column the most significant
nibble. The empty cells correspond to reserved combinations.
0x
Least Significant Nibble
x0
x1
x2
x3
x4
x5
x6
x7
x8
x9
xA
xB
xC
xD
xE
xF
LF2
CR3
Most Significant Nibble
1x 2x 3x 4x 5x
SP1 0 @ P
!
1
A
Q
"
2
B
R
#
3
C
S
$
4
D
T
%
5
E
U
&
6
F
V
'
7
G W
(
8
H
X
)
9
I
Y
*
:
J
Z
+
;
K
,
<
L
=
M
.
>
N
/
?
O
£
6x
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
7x
p
q
r
s
t
u
v
w
x
y
z
1
- SP stands for space character
- LF stands for Line Feed character
3
- CR stands for Carriage Return character
2
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For example:
1- Let's assume you want to find the IRA code for the character '&':
From the table you find:
- most significant Nibble: 2
- least significant Nibble: 6
Hence the IRA code for the '&' character is the hexadecimal 0x26.
2- Let's assume you have the IRA code 0x6B and you want to find the corresponding character:
From the table you find at the position
- most significant Nibble: 6
- least significant Nibble: B
Hence, the character corresponding to the 0x6B IRA code is 'k'.
TIP: With the command AT+CSCS is possible to select the character set; the available types
are:
“IRA” - ITU-T.50
”8859-1” - ISO 8859 Latin 1
”PCCP437” - PC character set Code Page 437.
”UCS2” - 16-bit universal multiple-octet coded character set (ISO/IEC10646)
Please refer to the AT Commands Reference Guide for the full command description
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3.5.3 Writing a New SMS to storage
A new SMS can be written in the selected storage <memw> (in the current SW version only "SM" is
supported) and then can be sent to the desired destination.
To write the new SMS:
•
send command AT+CMGW="<da>"<cr>
where:
<da>: destination address
• wait for prompt ">"
• send SMS text (MAX 160 characters)
• end command with CTRL-Z character (0x1A hexadecimal) or abort command with ESC character
(0x1B hexadecimal)
• wait for response:
Response
+CMGW: <index>
OK
ERROR
+CMS ERROR: 330
+CMS ERROR: 322
Reason
Action
Message has been successfully proceed ahead
written in position number
<index>
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
SMSC address unknown
Insert SMSC address (see par.
3.5.1.3)
Memory Full
memory is full, hence delete
some records and retry.
NOTE: if command is aborted with ESC character, then only the OK result code is returned.
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For example:
1- Let's assume you want to write a new SMS to the storage and the destination address is the
number +39338123456789. We suppose you already have set up the device for text SMS mode as
described on the previous paragraphs:
command:
AT+CMGW="+39338123456789"
response:
>
now you can insert the message text in IRA format (note that the IRA format and ASCII format
coincide for the alphabet characters but not for the other).
…. here will be inserted the SMS message text….
conclude text with the character CTRL-Z
response:
+CMGW: 3
OK
In this case, the new SMS was successfully written to the location index 3 of the selected write
memory (always "SM" SIM Card memory).
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3.5.4 Sending an SMS previously stored
An already written SMS can be sent from the selected storage <memw> (in the current SW version
only "SM" is supported).
To send the written SMS its location index is needed:
•
send command AT+CMSS=<index><cr>
where:
<index>: SMS location index
• wait for response:
Response
Reason
Action
+CMSS: <mr>
Message has been successfully proceed ahead
sent. <mr> represents the
OK
message reference number.
ERROR
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
+CMS ERROR: 330
SMSC address unknown
Insert SMSC address (see par.
3.5.1.3)
+CMS ERROR: 41
"Temporary Failure", may be
Check for signal strength and
that the device is not registered network registration
on any network
+CMS ERROR: 331
No network service
Check for signal strength and
network registration
+CMS ERROR: 1
Unassigned number
The destination address
number does not exist. Check it
and repeat command.
+CMS ERROR: 42
network congestion
Retry later
+CMS ERROR: 96
Mandatory information missing Check for destination address
in the SMS, overwrite it and
retry.
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For example:
1- Let's assume you want to send a SMS that was written to the storage index position number 3. We
suppose you already have set up the device for text SMS mode as described on the previous
paragraphs:
command:
AT+CMSS=3
response:
+CMSS: 1
OK
In this case, the SMS was successfully sent to the destination and its network message reference
number is 1.
3.5.5 Sending a new SMS without storing it
A new SMS can be sent directly to the network without storing it.
• send command AT+CMGS="<da>"<cr>
where:
<da>: destination address
• wait for prompt ">"
• send SMS text (MAX 160 characters)
• end command with CTRL-Z character (0x1A hexadecimal) or abort command with ESC character
(0x1B hexadecimal)
• wait for response:
Response
+CMGS: <mr>
OK
ERROR
+CMS ERROR: 330
+CMS ERROR: 41
+CMS ERROR: 331
+CMS ERROR: 1
Reason
Action
Message has been successfully proceed ahead
sent. <mr> represents the
message reference number.
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
SMSC address unknown
Insert SMSC address (see par.
3.5.1.3)
"Temporary Failure", may be
Check for signal strength and
that the device is not registered network registration
on any network
No network service
Check for signal strength and
network registration
Unassigned number
The destination address
number does not exist. Check it
and repeat command.
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+CMS ERROR: 42
+CMS ERROR: 96
network congestion
Mandatory information missing
OK
command aborted by user
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Retry later
Check for destination address
in the SMS, overwrite it and
retry.
you issued a ESC char
For example:
1- Let's assume you want to directly send a new SMS to the destination address number
+39338123456789. We suppose you already have set up the device for text SMS mode as described
on the previous paragraphs:
command:
AT+CMGS="+39338123456789"
response:
>
now you can insert the message text in IRA format (note that the IRA format and ASCII format
coincide for the alphabet characters but not for the other).
…. here will be inserted the SMS message text to be sent….
conclude text with the character CTRL-Z
response:
+CMGW: 4
OK
In this case, the new SMS was successfully sent to the SC and its network reference number is 4.
Do not confuse message reference with message index position, the first indicates the network
reference for identifying the sent message (the eventually requested status report will have the same
reference) while the second indicates the position where the message has eventually been stored in
memory.
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3.5.6 Deleting an SMS
An already written/received SMS can be deleted from the selected storage (in the current SW version
only "SM" is supported).
To delete the SMS its location index is needed:
•
send command AT+CMGD=<index><cr>
where:
<index>: SMS location index
• wait for response:
Response
OK
ERROR
+CMS ERROR: 321
Reason
Action
Message has been successfully proceed ahead
deleted.
some error occurred
Enable the extended error
codes report (see par.2.5.2.1)
and retry.
Invalid memory index
Check the <index> number and
e.g. the given record was
retry.
already empty
For example:
1- Let's assume you want to delete a previously written SMS that was written to the storage index
position number 3. We suppose you already have set up the device for text SMS mode as described
on the previous paragraphs:
command:
AT+CMGD=3
response:
OK
In this case, the SMS was successfully deleted.
2- Let's assume you want to delete a received SMS that was stored to the index position number 7:
command:
AT+CMGD=7
response:
OK
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3.5.7 Reading an SMS
A new SMS can be read with the command:
•
send command AT+CMGR=<index><cr>
where:
<index>: SMS location index
•
wait for response in the format:
Output format for received messages (the information written in italics will be present depending on
+CSDH last setting):
+CMGR: <stat>,<oa>,<alpha>,<scts>[,<tooa>,<fo>,<pid>,
<dcs>,<sca>,<tosca>,<length>]<CR><LF><data>
Output format for sent messages:
+CMGR: <stat>,<da>,<alpha>[,<toda>,<fo>,<pid>,<dcs>,,
<sca>,<tosca>,<length>]<CR><LF><data>
Output format for message delivery confirm:
+CMGR: <stat>,<fo>,<mr>,,,<scts>,<dt>,<st>
where:
<stat> - status of the message
"REC UNREAD" - new received message unread
"REC READ" - received message read
"STO UNSENT" - message stored not yet sent
"STO SENT" - message stored already sent
<fo> - first octet of the message PDU
<mr> - message reference number
<scts> - arrival time of the message to the SC
<dt> - sending time of the message
<st> - message status as coded in the PDU
<pid> - Protocol Identifier
<dcs> - Data Coding Scheme
<oa> - Originator address, string type represented in the currently selected character set (see
+CSCS)
<da> - Destination address, string type represented in the currently selected character set (see
+CSCS)
<alpha> - string type alphanumeric representation of <da> or <oa>, corresponding to an entry found
in the phonebook; used character set is the one selected with command +CSCS. NB: this
optional field is currently not supported.
<sca> - Service Centre number
<tooa>,<toda >,<tosca> - type of number <oa>,<da>,<sca>
129 - number in national format
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145 - number in international format (contains the "+")
<length> - text length
<data> - TP-User_data
• If <dcs> indicates that GSM03.38 default alphabet is used , each character of GSM alphabet will
be converted into current TE character set (see +CSCS)
• If <dcs> indicates that 8-bit or UCS2 data coding scheme is used, each 8-bit octet will be
converted into two IRA character long hexadecimal number (e.g. octet 0x2A will be converted as
two characters 0x32 0x41)
NOTE: in both cases if status of the message is 'received unread', status in the storage changes to
'received read'.
NOTE: an error result code is sent on empty record <index>.
For example:
1- Let's assume you want to read the SMS that is stored at the position index 4. We suppose you
already have set up the device for text SMS mode as described on the previous paragraphs:
command:
AT+CMGR=4
response:
+CMGR: "STO UNSENT","+393351234565"
Telit Test Message for Text Mode SMS.
OK
In this case the SMS was successfully read, the text contained was:
" Telit Test Message for Text Mode SMS."
The message was written to the storage by user (STO) but still not sent (UNSENT) to the destination
address that's the number +393351234565
2- Let's assume you want now to read the SMS that is stored at the position index 5:
command:
AT+CMGR=5
response:
+CMGR: "REC UNREAD","+393381234567890", ,"29/06/01,12:30:04+01"
Telit Test Message for Text Mode SMS RECEIVING.
OK
In this case the SMS was successfully read, the text contained was:
" Telit Test Message for Text Mode SMS RECEIVING."
The message was received (REC) from the number +393381234567890 at 12:30:04 the day 29/06/01
in the European time zone +1.
After this read command the message at index 5 becomes REC READ.
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3.5.8 Listing a group of SMSs
The SMS can be grouped into 5 different groups depending on their status:
ƒ REC UNREAD
- received messages still not read
ƒ REC READ
- received messages already read
ƒ STO UNSENT
- written messages not yet sent
ƒ STO SENT
- written messages already sent
ƒ ALL
- all types of messages
It is possible to have the list of all the messages in one group:
•
send command AT+CMGL=<stat><cr>
where:
<stat> - status group of the message
"REC UNREAD"
- new message
"REC READ"
- read message
"STO UNSENT"
- stored message not yet sent
"STO SENT"
- stored message already sent
"ALL"
- all messages
• wait for response in the format:
For every message in the group:
+CMGL: <index>,<stat>,<oa/da> [,,,<tooa/toda>,<length>]
<CR><LF><text>
where:
<index> - message index position on the storage
<stat> - status of the message
"REC UNREAD" - new message
"REC READ" - read message
"STO UNSENT" - stored message not yet sent
"STO SENT" - stored message already sent
<oa/da> - sender number/destination number
< tooa/toda > - type of number <oa/da>
145 - international number (contains "+" character)
129 - national number
<length> - length of the message text in characters
<text> - message text
NOTE: If status of the message is 'received unread', status in the storage changes to 'received read'.
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For example:
1- Let's assume you want to list all the SMS received read that are stored. We suppose you already
have set up the device for text SMS mode as described on the previous paragraphs:
command:
AT+CMGL="REC READ"
response:
+CMGL: 5, "REC READ","+393381234567890"
Telit Test Message for Text Mode SMS RECEIVING.
+CMGL: 8, "REC READ","+393381234567890"
Telit Second Test Message for Text Mode SMS RECEIVING.
OK
In this case the SMS group was successfully read, the messages Received UNREAD were two in the
position indexes 5 & 8. The optional parameters <tooa/toda> and <length> were not shown.
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3.6 Using General Purpose Input/Output pins
The Telit GM862-GPS provides various General Purpose Input/Output pins, these pins can be
configured via AT commands as Inputs, Outputs and two of them as "alternate function".
The "alternate function" are supported by pins GPIO5, which can be configured to become a RF
Transmission monitor output pin that reflects the RF transmission activation, GPIO6, which can be
configured to become an alarm output pin that reflects the alarm status, and GPIO7 which can be
configured to become a buzzer output pin.
With these pins your application can control external hardware directly using the Telit GM862-GPS
pins, with little or even no hardware added.
3.6.1 GPIO pin setup
Before using the GPIO pin, you must configure them to select their direction or alternate function
3.6.1.1 Setting GPIO pin as OUTPUT
When you set a GPIO as output, you must specify also the value that the pin output must take:
• Send command AT#GPIO=<pin>,<value>,1<cr>
where:
<pin> is the GPIO pin number at which the command applies:
7 – GPIO7
2 – GPIO2
8 – GPIO8
3 – GPIO3
9 – GPIO9
4 – GPIO4
10 – GPIO10
5 – GPIO5
11 – GPIO11
6 – GPIO6
12 – GPIO12
13 – GPIO13
<value> is the GPIO pin value that the pin will assume:
0 – LOW
1 – HIGH
•
wait for response OK
NOTE: The #GPIO setting is not saved and will be lost on power off, so at start-up repeat pin
initialization commands. At start-up the setting for GPIO5, GPIO6 and GPIO7 instead is
maintained even after a shutdown to permit RFTXMON, alarm & buzzer feature to work always.
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For example:
1- Let's assume you want to set GPIO3 pin as Output and you want it to be in LOW status:
command:
AT#GPIO=3,0,1<cr>
response:
OK
In this case, the GPIO3 pin was successfully put in output direction and its status has been set to
LOW.
3.6.1.2 Setting GPIO pin as INPUT
When you set a GPIO as input, you must specify also a dummy value for the pin state:
• Send command AT#GPIO=<pin>,<dummy_value>,0<cr>
where:
<pin> is the GPIO pin number at which the command applies:
1 – GPI1
7 – GPIO7
8 – GPIO8
3 – GPIO3
9 – GPIO9
4 – GPIO4
10 – GPIO10
5 – GPIO5
11 – GPIO11
6 – GPIO6
12 – GPIO12
13 – GPIO13
<value> is a dummy value can be either:
0 – dummy value
1 – dummy value
•
wait for response OK
NOTE: The #GPIO setting for all GPIO except from GPIO6, GPIO7, is not saved and will be lost
on power off, so at start-up repeat pin initialization commands.
At start-up all the GPIOs except from GPIO6 & GPIO7 are configured by default as INPUT, but
the setting for GPIO6 and GPIO7 instead is maintained even after a shutdown to permit alarm &
buzzer feature to work always.
For example:
1- Let's assume you want to set GPIO4 pin as Input:
command:
AT#GPIO=4,0,0<cr>
response:
OK
In this case, the GPIO4 pin was successfully put in input direction.
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3.6.2 GPIO pin use
After having set-up the GPIO pin direction you can query the input status of an INPUT pin or set the
output status of an OUTPUT pin.
3.6.2.1 Querying GPIO pin status
To query for the pin status:
• Send command AT#GPIO=<pin>,2<cr>
where:
<pin> is the GPIO pin number at which the command applies:
1 – GPIO1
7 – GPIO7
2 – GPIO2
8 – GPIO8
3 – GPIO3
9 – GPIO9
4 – GPIO4
10 – GPIO10
5 – GPIO5
11 – GPIO11
6 – GPIO6
12 – GPIO12
13 – GPIO13
• wait for response in the format:
#GPIO: <dir>,<stat>
OK
where:
<dir> - GPIO<pin> direction setting
<stat> - status of the pin
0 - LOW
1 - HIGH
NOTE: In case the GPIO pin direction is set to ALTERNATE FUNCTION (2), then the reported
<stat> has no meaning and shall not kept as valid, but shall be threaten as a dummy value.
TIP: The query reports depending on the pin direction:
- the read pin status in case the direction is input;
- the previously set pin status in case the direction is output.
In any case, you can know if the pin at the query moment is high or low and the pin direction.
For example:
1- Let's assume you want to query the GPIO3 pin for its status:
command:
AT#GPIO=3,2<cr>
response:
#GPIO: 0,1
OK
In this case, the GPIO3 pin was set in input direction and its status has been measured to be HIGH.
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2- Let's assume you want to query the GPIO4 pin for its status:
command:
AT#GPIO=4,2<cr>
response:
#GPIO: 1,0
OK
In this case, the GPIO4 pin was set in output direction and its status is LOW.
3- Let's assume you want to query the GPIO6 pin for its status:
command:
AT#GPIO=6,2<cr>
response:
#GPIO: 2,0
OK
In this case, the GPIO6 pin was set in "alternate function" direction and therefore works as alarm
output. The reported status = LOW has no meaning.
3.6.2.2 Setting GPIO pin output status
To set the pin status (when pin is set as OUTPUT):
• Send command AT#GPIO=<pin>,<value>,1<cr>
where:
<pin> is the GPIO pin number at which the command applies:
7 – GPIO7
2 – GPIO2
8 – GPIO8
3 – GPIO3
9 – GPIO9
4 – GPIO4
10 – GPIO10
5 – GPIO5
11 – GPIO11
6 – GPIO6
12 – GPIO12
13 – GPIO13
<value> is the pin value to be set and can be:
0 – LOW
1 – HIGH
•
wait for response OK
For example:
1- Let's assume you want to set the GPIO3 pin HIGH:
command:
AT#GPIO=3,1,1<cr>
response:
OK
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In this case, the GPIO3 pin was set in output direction and its status has been set to HIGH.
3.6.2.3 Using GPIO5 pin as RFTXMON OUTPUT (alternate function)
When you set the GPIO5 pin as RFTXMON output function, the pin reports the Transmitter active
status. To set the pin in alternate function you must specify also a dummy value for the pin state:
• Send command AT#GPIO=5,<dummy_value>,2<cr>
where:
<value> is a dummy value can be either:
0 – dummy value
1 – dummy value
•
wait for response OK
TIP: Remember that the alternate function places the GPIO5 pin always in OUTPUT direction.
NOTE: The #GPIO5 direction setting is saved and will be kept after a power off.
The saving can be applied only for the alternate mode.
For example:
1- Let's assume you want to set GPIO5 pin as RFTXMON OUTPUT:
command:
AT#GPIO=5,0,2<cr>
response:
OK
In this case, the GPIO5 pin was successfully put in RFTXMON output direction.
3.6.2.4 Using GPIO6 pin as ALARM OUTPUT (alternate function)
When you set the GPIO6 pin as alarm output function, the pin reports the alarm state following the
+CALA settings. To set the pin in alternate function you must specify also a dummy value for the pin
state:
• Send command AT#GPIO=6,<dummy_value>,2<cr>
where:
<value> is a dummy value can be either:
0 – dummy value
1 – dummy value
•
wait for response OK
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TIP: Remember that the alternate function places the GPIO6 pin always in OUTPUT direction
and since the GPIO6 pin value is controlled by the internal software, the corresponding
function (+CALA) must be setup properly.
NOTE: The #GPIO6 direction setting is saved and will be kept after a power off.
The saving can be applied only for the alternate mode.
For example:
1- Let's assume you want to set GPIO6 pin as ALARM OUTPUT:
command:
AT#GPIO=6,0,2<cr>
response:
OK
In this case, the GPIO6 pin was successfully put in alarm output direction.
3.6.2.5 Using GPIO7 pin as BUZZER OUTPUT (alternate function)
When you set the GPIO7 pin as buzzer output function, the pin will output a waveform suitable to drive
a Buzzer, provided a simple external mosfet driver is developed and that the #SRP settings are
adequate. To set the pin in alternate function you must specify also a dummy value for the pin state:
• Send command AT#GPIO=7,<dummy_value>,2<cr>
where:
<value> is a dummy value can be either:
0 – dummy value
1 – dummy value
•
wait for response OK
TIP: Remember that the alternate function places the GPIO7 pin always in OUTPUT direction
and since the GPIO7 pin value is controlled by the internal software, the corresponding
function (#SRP) must be setup properly.
NOTE: The #GPIO7 direction setting is saved and will be kept after a power off.
The saving can be applied only for the alternate mode.
For example:
1- Let's assume you want to set GPIO7 pin as BUZZER OUTPUT:
command:
AT#GPIO=7,0,2<cr>
response:
OK
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In this case, the GPIO7 pin was successfully put in buzzer output direction.
3.7 Clock/Alarm function
The Telit GM862-GPS provides a Real Time Clock and Alarm embedded in the product; it is therefore
possible to set-up the proper time, check the actual time, set-up an alarm time at which the alarm will
be triggered with various behavior depending on the +CALA setting.
The only requirement is that the power input to the Telit GM862-GPS has to be guaranteed without
interruptions, the Telit GM862-GPS has no backup battery; therefore it will lose the time setting if its
power supply is interrupted.
On Alarm trigger the Telit GM862-GPS can:
• automatically Wake-up fully operative from shutdown as if the ON/OFF
• automatically Wake-up from shutdown in a special status namely "alarm status" where it will not
look for or try to register into any network, as if it would be off, except from the fact that it proceeds
with the alarm action and it can receive commands to return completely operative or shutdown
immediately.
• If already ON at alarm trigger time, simply proceed with the Alarm action
Once Woken-up the Telit GM862-GPS proceeds with the chosen action that can be
• issue an unsolicited code "+ALARM: <user_text>" on the serial port until a 90s timeout expires or a
special Wake-up command is received
• play an Alarm tone until a 90s timeout expires or a special Wake-up command is received
• rise the pin GPIO6 until a 90s timeout expires or a special Wake-up command is received
• any combination of these actions
With these features, the Telit GM862-GPS for example can:
• Wake-up itself and its controlling hardware by using the GPIO6 pin at the desired time, so timely
surveys can be programmed without the need to keep the any hardware on and therefore reducing
power consumption to a minimum.
• Activate some special hardware on time trigger event with the GPIO6 pin.
• Alert the controlling application that the alarm time has come with the unsolicited code
"+ALARM:<user_text>"
• Alert the user with the alarm tone played
3.7.1 Clock date/time
Before using the Alarm feature, you must regulate the internal clock.
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3.7.1.1 Regulate the Clock
• Send command AT+CCLK="<time>"<cr>
where:
<time> - current time as quoted string in the format : "yy/MM/dd,hh:mm:ss±zz"
yy - year (two last digits are mandatory), range is 00..99
MM - month (two last digits are mandatory), range is 01..12
dd - day (two last digits are mandatory), range is 01..31 (if the month MM has less than 31 days, the
clock will be set for the next month)
hh - hour (two last digits are mandatory), range is 00..23
mm - minute (two last digits are mandatory), range is 00..59
ss - seconds (two last digits are mandatory), range is 00..59
±zz - time zone (indicates the difference, expressed in quarter of an hour, between the local time and
GMT; two last digits are mandatory), range is -47..+48
NOTE: If the parameter is omitted the behavior of Set command is the same as Read command.
• wait for response OK
TIP: Remember that the string time has to be encapsulated in double brackets.
NOTE: The time will start immediately after the time setting command.
For example:
1- Let's assume you want to regulate your clock to 7 November 2002 at 12h 24m 30s for the time zone
+01h central Europe:
command:
AT+CCLK="02/11/07,12:24:30+04"<cr>
response:
OK
In this case, the time was successfully set.
3.7.1.2 Read the current date/time
•
Send command
AT+CCLK?<cr>
• wait for response in the format:
+CCLK: <time>
OK
NOTE: the three last characters of <time> are not returned by +CCLK? because the ME doesn’t
support time zone information.
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For example:
1- Let's assume you want now to read the current time:
command:
AT+CCLK?<cr>
response:
+CCLK="02/11/07,12:26:47"<cr>
OK
In this case the current date/time is: 7 November 2002 12h 26m 47s
3.7.2 Alarm function
Once the current time has been set, the alarm function can be setup.
3.7.2.1 Regulate the Alarm time & behavior
• Send command AT+CALA="<time>",0,<type>,"<text>"<cr>
where:
<time> is the Alarm time string in the same format of the clock setting command:
yy/MM/dd,hh:mm:ss±zz
where:
yy : two digits year (00-99)
MM : two digits month (01-12)
dd : two digits day (01-31)
hh : two digits hour (00-24)
mm : two digits minute (00-60)
ss : two digits seconds (00-60)
±zz: signed two digits timezone (-11 - +11)
<type> is the Alarm behavior:
0 - reserved for other equipment use.
1 - the MODULE simply wakes up fully operative as if the ON/OFF button had been pressed. If the
device is already ON at the alarm time, then it does nothing.
2 - the MODULE wakes up in "alarm mode" if at the alarm time it was off, otherwise it remains fully
operative. In both cases the MODULE issues an unsolicited code every 3s:
+ALARM: <text>
where <text> is the +CALA optional parameter previously set.
The device keeps on sending the unsolicited code every 3s until a #WAKE or #SHDN command is
received or a 90s timeout occurs. If the device is in "alarm mode" and it does not receive the
#WAKE command within 90s then it shuts down. (default)
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3 - the MODULE wakes up in "alarm mode" if at the alarm time it was off, otherwise it remains fully
operative. In both cases the MODULE starts playing the alarm tone on the selected path for the
ringer (see command #SRP)
The device keeps on playing the alarm tone until a #WAKE or #SHDN command is received or a
90s timeout occurs. If the device is in "alarm mode" and it does not receive the #WAKE command
within 90s then it shuts down.
4 - the MODULE wakes up in "alarm mode" if at the alarm time it was off, otherwise it remains fully
operative. In both cases the MODULE brings the pin GPIO6 high, provided its <direction> has
been set to alarm output, and keeps it in this state until a #WAKE or #SHDN command is received
or a 90s timeout occurs. If the device is in "alarm mode" and it does not receive the #WAKE
command within 90s then it shuts down.
5 - the MODULE will make both the actions as for <type>=2 and <type>=3.
6 - the MODULE will make both the actions as for <type>=2 and <type>=4.
7 - the MODULE will make both the actions as for <type>=3 and <type>=4.
<text> - unsolicited alarm code text string. It has meaning only if <type> is equal to 2 or 5 or 6.
•
wait for response OK
TIP: Remember that the string time has to be encapsulated in double brackets, furthermore the
Alarm time will not be computed for different timezone, therefore the alarm time will always
refer to the same timezone as the clock setting regardless the timezone set in the +CALA
command.
NOTE: if you use the GPIO6 pin as ALARM OUTPUT, then you MUST set its direction to
"alternate function" (see par. 3.6.2.4) otherwise the pin will not respond to the alarm settings.
In case the alarm mode is equal to 1,3,7 then a dummy empty text shall be inserted "".
NOTE: if you use the unsolicited codes +ALARM: <text>, then you must fix the port speed rate
(see par. 2.5.1) and store it in the active profile (see command &W), in order to make the Telit
GM862-GPS boot with the desired port speed, otherwise at the alarm wakeup, the module will
start with the default port speed that may differ from yours.
3.7.2.2 Stop the Alarm activity
When the alarm time expires, the module starts the alarm activity according to the alarm behavior
parameter <type> selected.
To stop the Alarm activity there are three ways, you can either decide to exit from alarm and shutdown
the device or exit from alarm and entering the normal operational status; otherwise you can leave the
alarm go on until the 90s timeout is reached.
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3.7.2.2.1 Exit from the alarm status and shutdown
•
•
Send command AT#SHDN<cr>
wait for response OK
At the OK result code, the device will end alarm activity and shutdown.
3.7.2.2.2 Exit from the alarm status and enter the normal operating mode
•
•
Send command AT#WAKE=0<cr>
wait for response OK
At the OK result code, the device will end alarm activity and enter normal operating mode. If the
device was already in normal operating mode (alarm has started when the module was already ON),
then with the command only the alarm activity is terminated.
3.7.2.3 Querying the Alarm status
When the device awakes by means of an alarm time expire, the module starts the alarm activity but
not the network activity, permitting some operations to be done by the controlling application without
registering the mobile in the network.
To check if the mobile is in the "alarm status" and therefore no network activity is done or if the device
is in the normal operating status:
• Send command AT#WAKE?<cr>
• wait for response in the format:
+WAKE: <status>
OK
where:
<status> is the operating mode:
0 - normal operating mode
1 - alarm mode
NOTE: if the device is in the alarm mode no network activity is done, therefore the only
commands that are accepted are the #WAKE and #SHDN ones.
When in the alarm mode, no operation is allowed towards the network, therefore it is not
possible to receive or send calls, SMS and whatever GSM/GPRS services.
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3.7.2.3.1 Alarm operation example
For example:
1- Let's assume you have a battery powered device, a meteorological unit that measures every hour
the conditions and therefore needs to send a new SMS every hour to the central server, for example
indicating the whether status just measured. Let say your application shall consume the absolute
minimum power to achieve the job, since it will be placed in a remote position where its battery shall
last as long as possible and therefore it should shutdown completely and wake up every hour for just
the time needed to measure & send the whether, successively shutdown.
- set up the time in the internal clock (only the first time..)
command:
AT+CCLK="02/11/07,12:24:30+01"<cr>
response:
OK
- set up the next alarm in order to raise the GPIO6 pin to power up the controlling application too.
command:
AT+CALA="02/11/07,13:24:30+01",0,6,"TIME TO MEASURE & SMS…!"<cr>
response:
OK
- shutdown the GM862-GPS and successively the controlling application.
command:
AT#SHDN<cr>
response:
OK
… after an hour..
The GM862-GPS will turn itself ON in "Alarm Mode" and contemporarily both rise the GPIO6 pin which
turns on the power to the controlling application and issue every 3s an unsolicited code +ALARM:
TIME TO MEASURE & SMS…!
- turn on the keep alive line in the controlling application that keeps itself ON.
- stop the alarm activity in the GM862-GPS (recognized by the +ALARM unsolicited code) and bring
the GM862-GPS in operating mode
command:
AT#WAKE=0<cr>
response:
OK
- take the whether measure
- send the SMS with the whether data (see Sending a new SMS without storing it par. 3.5.5).
- read the current time.
command:
AT+CCLK?<cr>
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response:
+CCLK="02/11/07,13:24:47"<cr>
OK
- calculate & set up the next alarm in order to raise the GPIO6 pin to power up the controlling
application too.
command:
AT+CALA="02/11/07,14:24:47+01",0,6,"TIME TO MEASURE & SMS…!"<cr>
response:
OK
- shutdown the GM862-GPS and successively the controlling application.
command:
AT#SHDN<cr>
response:
OK
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4 GPRS operations
4.1 Introduction
The General Packet Radio Services (GPRS) standard permits DATA transfers in a completely
different way with respect to previous point to point communications made with Circuit Switch Data
(CSD) GSM modems.
In CSD operations the modem establishes a connection with the other party (another modem) in such
a way that all the Network devices in between are transparent to the data exchanged, simulating a real
point to point connection, just as if the other party is directly connected with the controlling application
of the modem. The other party can be either an Internet Service Provider (ISP) or a private server, but
in any case, the arrival point must have a modem to connect to (Landline, ISDN or GSM CSD). The
connection establishment procedure defines a particular path where all the information exchanged
between the two peers flows and this path is reserved for exclusive use of these 2 peers for all the
time the connection is active.
This approach has the drawbacks of a long time to set-up the link between the two peers (up to a
minute) and a time counting bill which proceeds even if no data is exchanged because the path
resources are reserved anyway; furthermore the speed of the data transfer is limited to 14400 bps.
An example of this kind of operation is shown in the following picture, where the point to point
connection is between the two peers as if all the devices inside the dashed line are not present:
CSD interconnectivity
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In GPRS operations instead, the connection is made directly towards internet as if the GPRS modem
was a network IP socket interface. There's no data path reserved for the data exchange between the
two peers, instead the resources are allocated dynamically on demand and the data exchanged is
organized into packets typically TCP/IP, furthermore the maximum transfer speed can be much faster
than GSM CSD.
An example of GPRS connection is shown in the following picture, where the GPRS connection is
between the GPRS modem and the internet as if all the devices inside the dashed line are not
present:
GPRS interconnectivity
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Due to this kind of connection, when activating the GPRS connection you must provide the network
parameters to enter through the internet point of the GPRS network ISP (Internet Service Provider)
and not the phone number to be dialed; therefore it is not possible to establish a direct point to point
GPRS connection between two modems as in CSD case, instead an internet tunneling must be done
to achieve a point to point connection between two peers.
This approach as the immediate advantage of projecting the controlling application of the GPRS
modem directly on the internet, ready to be accessed virtually from anywhere in the world at the same
cost on the GPRS; actually the billing of the GPRS connection is based on the amount of data
exchanged (number of packets transferred) independently from the time the connection is active or
where these packet must be delivered. Therefore, it is possible to leave the controlling application
always connected and ready to receive/send data on demand, while paying only for the data really
exchanged.
The drawback of the GPRS connection is that the controlling application must have its own TCP/IP
protocol stack embedded to decode the packets that arrive from GPRS and encode the ones to be
sent through the internet.
There are few considerations than must be done on the GPRS connections:
- the GPRS connection speed with a GPRS class 10 multislot device is asymmetrical, 3 time slots in
reception (43200 bps max) and 2 time slot in sending (28800 bps max).
- The controlling application of the module must have a TCP/IP - PPP software stack to interface
with the GPRS modems.
- The controlling application must relay on some ISP that may be the Network Operator of the SIM
to gain access to the internet through the GPRS connection.
- Because of the point before, the receiving application must have internet access either.
- Since the communication is based upon TCP/IP packets, then it is possible to talk contemporarily
with more than one peer.
- When required, the data security in internet shall be guaranteed by security protocols over the
TCP/IP that must be managed by the controlling application.
4.1.1 CSD application example
Let's suppose you have several remote meteorological measurement units spread around the territory,
and you want to access them wirelessly through a GSM module in CSD operation.
For each remote unit, there's a modem to connect with the server application, with its own SIM card
and unique phone number.
Now there are two possibilities:
- the server application calls on demand the remote units, provided it has stored their phone
numbers in a private database.
- the remote units call the server application modem when needed and eventually retry in the case
they found it busy; this time the phone number to be stored is only one, the server number which
must be stored on the remote units.
In both cases, once connected, the remote unit sends the meteorological data to the server, which
places it in a central database for further reading by anyone who accesses the meteorological internet
site for example.
The drawback of this approach is that the CSD modem needs about 30s to establish the connection
and, depending on the amount of data to be transferred (usually few hundreds bytes), some seconds
to transfer them. So let say we pay a 40s call while we need only 10s to transfer data.
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4.1.2 GPRS application example
The same application can be made with the GM862-GPS using the GPRS feature.
The remote unit is always connected to the internet (at no charge) taking advance of the features of
the GPRS system, when it needs to send data to the server application it simply fills the TCP/IP
packets for the server with the meteorological data and gives them to the GM862-GPS to be delivered.
The central server has a single modem to connect to the internet, receives the TCP/IP packets from all
the remote units and places the contained data in the central database.
The advantage of using GPRS is that the remote unit is always connected and reachable and it pays
only for the amount of data (small) transferred and not for the connection time as in CSD operations;
in addiction the call billing is equal for devices placed anywhere in the Network Operator State and the
server can be anywhere in the World.
Furthermore, in the CSD operation the server shall have a set of modems and multiple phone lines to
ensure that the calling units will not find it busy, while a single modem is enough for GPRS operation.
The speed at which the packets can be transferred is up to 57600 bps (class 10 device, 4+1), 4 times
faster than CSD.
NOTE: For more detailed information about GPRS connections and practical examples refer to the
Easy GPRS User Guide
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5 GPS operations
5.1 Introduction
The GM862-GPS module is equipped with a SiRFStar III GPS receiver that is controllable by the GSM
modem using a setof AT commands or dedicated NMEA sentences.
5.2 GM862-GPS Serial Ports
2 serial ports are available on the module:
• MODEM SERIAL PORT
• GPS SERIAL PORT B (NMEA)
5.2.1 GPS SERIAL PORT B (NMEA)
This port is carrying out the GPS navigation data in NMEA 0183 format.
The default configuration is 4800 bps, 8, n, 1
It is available on the following pins:
PIN #
35
41
NAME
TX_GPS
RX_GPS
DESCRIPTION
GPS TX Data (NMEA)
GPS RX Data (NMEA)
TYPE
CMOS 2.8V
CMOS 2.8V
5.3 WGS 84
GPS receivers perform initial position and velocity calculations using an earth-centered earth-fixed
(ECEF) coordinate system. Results may be converted to an earth model (geoid) defined by the
selected datum. For GM862-GPS the default datum is WGS 84 (World Geodetic System 1984) which
provides a worldwide common grid system that may be translated into local coordinate systems or
map datums. (Local map datums are a best fit to the local shape of the earth and not valid worldwide).
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5.4 NMEA 0183
The NMEA 0183 is a specification created by the National Marine Electronics Association (NMEA) that
defines the interface between other marine electronic equipment.
The standard permits marine electronics to send information to computers and to other marine
equipment.
GPS receiver communication is defined within this specification.
The actually supported version is 2.2
The provided NMEA sentences are :
GGA
Time, position and fix type data.
GLL
Latitude, longitude, UTC time of position fix and status.
GSA
GPS receiver operating mode, satellites used in the
position solution and DOP values.
GSV
The number of GPS satellites in view satellite ID numbers,
elevation, azimuth, and SNR values.
VTG
Course and speed information relative to the ground.
RMC
Time, date, position, course and speed data.
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5.4.1 GGA - Global Positioning System Fixed Data
This sentence provides Time, position, and fix related data for a GPS Receiver
Table A contains the values for the following example:
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18
Table A
Name
Message ID
UTC Time
Latitude
N/S Indicator
Longitude
E/W Indicator
Position Fix
Indicator
Satellites
Used
HDOP
MSL Altitude
Units
Geoid
Separation
Units
Age of Diff.
Corr.
Diff. Ref.
Station ID
Checksum
<CR> <LF>
Example
Units
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
Description
GGA protocol header
hhmmss.sss
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
See Table B
07
Range 0 to 12
1.0
9.0
M
M
Horizontal Dilution of Precision
meters
meters
meters
meters
second
Null fields when DGPS is not used
0000
*18
End of message termination
Table B
Value
0
1
2
3-5
6
Description
Fix not available or invalid
GPS SPS Mode, fix valid
Differential GPS, SPS Mode, fix valid
Not supported
Dead Reckoning Mode, fix valid
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5.4.2 GLL - Geographic Position - Latitude/Longitude
This sentence provides latitude and longitude of vessel position, time of position fix
and status
Table C contains the values for the following example:
$GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41
Table C
Name
Message ID
Latitude
N/S Indicator
Longitude
E/W Indicator
UTC Time
Status
Mode
Example
Units
$GPGLL
3723.2475
N
12158.3416
W
161229.487
A
A
Checksum
<CR> <LF>
*41
Description
GLL protocol header
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
hhmmss.sss
A=data valid or V=data not valid
A=Autonomous, D=DGPS, E=DR
(Only present in NMEA version 3.00)
End of message termination
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5.4.3 GSA - GNSS DOP and Active Satellites
This sentence reports the GPS receiver’s operating mode, satellites used in the navigation solution
reported by the GGA sentence and DOP values.
Table D contains the values for the following example:
$GPGSA,A,3,07,02,26,27,09,04,15, , , , , ,1.8,1.0,1.5*33
Table D: GSA Data Format
Name
Message ID
Mode 1
Mode 2
Satellite
Used1.
Satellite used
in solution.1
Satellite
Used1
....
Satellite
Used1
PDOP
HDOP
VDOP
Checksum
<CR> <LF>
Example Units
$GPGSA
A
3
07
Description
GSA protocol header
See Table E
See Table F
Sv on Channel 1
02
Sv on Channel 2
1.8
1.0
1.5
*33
End of message termination
Table E: Mode 1
Value
M
A
Description
Manual—forced to operate in 2D or 3D
mode
2D Automatic—allowed to automatically
switch 2D/3D
Table F: Mode 2
Value
1
2
3
Description
Fix not available
2D (<4 SVs used)
3D (>3 SVs used)
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5.4.4 GSV - GNSS Satellites in View
This sentence reports the number of satellites (SV) in view, satellite ID numbers, elevation, azimuth
and SNR value.
There could be four satellites information per transmission so, if the number of satellites in view is
bigger, separated GSV sentences will be generated. The number of sentence in transmission and the
total to be transmitted is shown in the first 2 fields of the sentence.
Table G contains the values for the following example:
$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71
$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41
Table G: GSV Data Format
Name
Message ID
Number of
Messages
Message
Number1
Satellites in
View
Satellite ID
Elevation
Azimuth
SNR (C/No)
....
Satellite ID
Elevation
Azimuth
SNR (C/No)
Checksum
<CR> <LF>
Example Units
$GPGSV
2
Description
GSV protocol header
Range 1 to 3
1
Range 1 to 3
07
07
79
048
42
....
27
27
138
42
*71
Channel 1 (Range 1 to 32)
degrees
degrees
dBHz
....
Channel 4 (Range 1 to 32)
degrees Channel 4 (Maximum 90)
degrees Channel 4 (True, Range 0 to 359)
dBHz
Range 0 to 99, null when not tracking
End of message termination
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5.4.5 RMC - Recommended Minimum Specific GNSS Data
This sentence reports Time , date, position, course and speed data.
Table H contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10
Table H: RMC Data Format
Name
Message ID
UTC Time
Status
Latitude
N/S Indicator
Longitude
E/W Indicator
Speed Over
Ground
Course Over
Ground
Date
Magnetic
Variation
Mode
Checksum
<CR> <LF>
Example
Units
$GPRMC
161229.487
A
3723.2475
N
12158.3416
W
0.13
knots
Description
RMC protocol header
hhmmss.sss
A=data valid or V=data not valid
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
309.62
degrees True
120598
ddmmyy
degrees E=east or W=west
A
*10
A=Autonomous, D=DGPS, E=DR
End of message termination
NOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS84 directions.
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5.4.6 VTG - Course Over Ground and Ground Speed
This sentence reports the actual course and speed relative to the ground.
Table I contains the values for the following example:
$GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*23
Table I: VTG Data Format
Name
Message ID
Course
Reference
Course
Reference
Speed
Units
Speed
Units
Mode
Checksum
<CR> <LF>
Example
$GPVTG
309.62
T
M
0.13
N
0.2
K
A
*23
Units
Description
VTG protocol header
Measured heading
True
degrees Measured heading
Magnetic
knots
Measured horizontal speed
Knots
km/hr
Measured horizontal speed
Kilometers per hour
A=Autonomous, D=DGPS, E=DR
End of message termination
NOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS84 directions.
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5.5 Checking GPS device functionality
After a proper power on the device is ready to receive AT commands on the MODEM serial port.
The GPS receiver also will be automatically powered on and it will start the scan of the available GPS
signals.
On the NMEA serial port (default 4800 bps, 8, n, 1) there must be presence of the NMEA sentences.
5.6 CONTROLLING GPS RECEIVER
The GM862-GPS module is provided by a set of AT commands that permits to configure and use it
through the MODEM serial port.
For the full list of available commands please refer to the GM862-GPS AT Commands Reference
Guide.
5.6.1 POWER CONTROL OF GPS RECEIVER
The GPS receiver is by default switched on at the first power On.
If is necessary to switch it off or On is possible to use the AT$GPSP command.
The GPS part is supplied by the VAUX1 signal provided by the GSM part. The GPS receiver is usable
if the GSM module is switched on (or at least in power saving).
This command also switch off the GPS antenna supply.
Syntax of the command :
AT$GPSP=<status>
Where <status> means :
0 GPS controller is powered down
1 GPS controller is powered up (default)
? Returns the range of values accepted
AT$GPSP? will return the current status.
Example 1 : (to switch off the GPS)
AT$GPSP=0<CR>
OK
Example 2 : (to know the status)
AT$GPSP?<CR>
The answer will be:
$GPSP: 0
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OK
NOTE: Due to the fact that VAUX1 could also be used to supply the Camera, if this device is switched
on the command AT$GPSP=0 will not be executed
5.6.2 GPS RESET
With the command AT$GPSR=<reset type> is possible to reset the GPS module.
Parameter:
<reset type>
0 - Hardware reset: the GPS receiver is reset and restarts by using the values stored in the internal
memory of the GPS receiver.
1 - Coldstart (No Almanac, No Ephemeris): this option clears all data that is currently stored in the
internal memory of the GPS receiver including position, almanac, ephemeris, and time. The stored
clock drift however, is retained. It is available in controlled mode only.
2 - Warmstart (No ephemeris): this option clears all initialization data in the GPS receiver and
subsequently reloads the data that is currently displayed in the Receiver Initialization Setup
screen. The almanac is retained but the ephemeris is cleared. It is available in controlled mode
only.
3 - Hotstart (with stored Almanac and Ephemeris): the GPS receiver restarts by using the values
stored in the internal memory of the GPS receiver; validated ephemeris and almanac. It is available in
controlled mode only.
Example :
Let’s suppose to perform a cold start of the GPS receiver.
AT$GPSR=1<cr>
OK
The Receiver will clear all the parameters in its memory and it will start a new scanning of the
available satellites.
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5.6.3 GPS ANTENNA MANAGEMENT
The GPS receiver needs an active antenna. This antenna could be supplied by the module.
By default the antenna supply is set to ON (the provided voltage is related to VBATT so the GPS
antenna have to accept a range of supply voltage from 3.4 to 4.2V DC)
With the AT$GPSAT command is possible to define this setting.
The syntax is AT$GPSAT=<type>
Parameter:
<type>
0 - GPS Antenna not supplied by the module
1 - GPS Antenna supplied by the module (default)
NOTE: if current <type> is 0, either $GPSAV? and $GPSAI? have no meaning.
5.6.3.1 GPS Antenna Current and Voltage Readout
With the commands AT$GPSAV? and AT$GPSAI? is possible to measure the supply voltage and
consumption of the GPS antenna.
The answer is (in the case of 3.8V dc measurement)
$GPSAV:3800
OK
For the current with the commnand AT$GPSAI? The answer is :
<value>[, <status>]
<value> the measured current in mA
<status> (1
0 GPS antenna OK
1 GPS antenna consumption out of the limits
STATUS is available only if the SW antenna protection is activated.
$GPSAI:040,0
OK
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5.6.4 GPS PARAMETERS SAVE
This command allows saving the set parameters in the module’s memory
Syntax of the command :
AT$GPSSAV
After this command restart the module to update the modifications.
5.6.5 RESTORE GPS PARAMETERS
This command allows restoring the factory default parameters for the GPS module
Syntax of the command :
AT$GPSRST
After this command restart the module to update the modifications.
5.6.6 READ ACQUIRED GPS POSITION
This command allows reading the acquired position of the GPS receiver
Syntax of the command :
AT$GPSACP
The response sintax is:
$GPSACP:<UTC>,<latitude>,<longitude>,<hdop>,<altitude>,<fix>,<cog>,
<spkm>,<spkn>,<date>,<nsat>
The fields contain the following information:
<UTC>:
hhmmss
(referred to GGA sentence)
UTC of Position
Values:
hh (hour) 00 to 23
mm (minutes) 00 to 59
ss (seconds) 00 to 59
<latitude>:
ddmm.mmmm N/S
(referred to GGA sentence)
Values:
dd (degrees) 00 to 90
mm.mmmm (minutes) 00,0000 to 59.9999
N/S: North / South
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<longitude>:
dddmm.mmmm E/W
(referred to GGA sentence)
Values:
ddd (degrees) 00 to 180
mm.mmmm (minutes) 00,0000 to 59.9999
E/W: East / West
<hdop>:
x.x
<altitude>:
xxxx.x
(referred to GGA sentence)
Horizontal Diluition of Precision
(referred to GGA sentence)
Altitude – mean-sea-level (geoid)
(meters)
<fix>:
0 - Invalid Fix
2 - 2D fix
3 - 3D fix
<cog>:
ddd.mm
(referred to VTG sentence)
Course over Ground (degrees, True)
Values:
ddd: 000 to 360 degrees
mm 00 to 59 minutes
<spkm>:
xxxx.x
(referred to VTG sentence)
Speed over ground (Km/hr)
<spkn>:
xxxx.x
(referred to VTG sentence)
Speed over ground (knots)
<date>:
ddmmyy
(referred to RMC sentence)
Date of Fix
Values:
dd (day) 01 to 31
mm (month) 01 to 12
yy (year) 00 to 99 (2000 to 2099)
<nsat> :
nn
Number of satellites in Use (referred to GGA sentence)
00-12 (may be different from the number in view)
Example:
$GPSACP:080220,4542.82691N,01344.26820E,259.07,3,2.1,0.1,0.0,0.0,270705,09
OK
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6 Service and firmware update
The Telit GM862-GPS module firmware can be updated through the same serial interface, which is used
normally for the AT commands. Since the software group is continuously working, in order to improve
the overall performances and introduce new features on the product, we suggest, in order to keep
updated the modules firmware, to foresee an external access to that interface with level converters to
RS232, which allows connecting a Windows-based PC. It shall be possible to start the update
procedure at POWER OFF condition of the module and then switch it ON to continue.
During the application development or evaluation phase of the Telit GM862-GPS module, the RS232
interface with the level converters or the USB port implemented on the Telit Evaluation Kit EVK2 can
be used to connect to a Windows-based PC on which the specific program for updating the Software
(TFI) can be run.
6.1 Step-by-Step upgrade procedure
The firmware update can be done with a specific software tool provided by Telit that runs on Windows
based PCs.
First the program will erase the content of flash memory, then the program will write on the flash
memory. To update the firmware of the module, we suggest the following procedure:
•
Collect information about the Hardware and implemented version of Software by the command
AT+CGMR<enter>, which returns the Software version information;
AT+CGMM<enter>, which returns the Model Identification.
1. Switch OFF the module.
2. Run the file TFI_xxxx.exe. When the following window should be displayed select the
language preferred by pressing the correspondent button.
3. The End User License Agreement will appear. Please, read it and accept the terms if you are
going to proceed.
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4. Press OK to the initial message.
NOTE: In connection with the GM862-GPS modules, charged battery has to be
understood that the power supply must not be disconnected during the firmware update.
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5. Select the right COM port and speed. Note that to go faster than 115200 you need a
special hardware on the PC. Then Press the Download button and within 5 seconds
power-on the GM862-GPS.
Wait for the end of programming green message OK
The Telit GM862-GPS module is now programmed with the new firmware.
NOTE: the above pictures show how the application dialogs appear for the GM862-PCS product. The
GM862-GPS TFI application is similar.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 110 of 111
GM862-GPS Software User Guide
1vv0300729 Rev. 4 - 24/01/07
7 Document Change Log
Revision
ISSUE #0
ISSUE #1
ISSUE #2
ISSUE #3
Date
04/05/06
07/09/06
21/11/06
19/12/06
ISSUE #4 24/01/07
Changes
First release
Review of all the document
2.6.2.1
General review of the whole document
-removed GPRS part, camera
-added SW firmware update
Updated 5.6.3 GPS Antenna Management
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 111 of 111
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