GPS Engine Board EB-3531
EB-3531
GPS Engine Board EB-3531
Version 1.0
08/13/2007
Globalsat Technology Corporation Headquarters (Far East Century Park)
16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235, Taiwan
Tel: 886-2-8226-3799/ Fax: 886-2-8226-3899
E-mail : [email protected]
Website: www.globalsat.com.tw
Page 1 of 27
Version 1.0
EB-3531
Version 1.0
1. Product Information
Product Name: EB-3531
Product Description:
EB-3531 is a compact, high performance, and low power consumption GPS engine board. It uses SiRF
Star III chipset which can track up to 20 satellites at a time and perform fast TTFF in weak signal
environments. EB-3531 is suitable for the following applications:
‧
‧
‧
‧
‧
Automotive navigation
Personal positioning
Fleet management
Mobile phone navigation
Marine navigation
Product Features:
SiRF star III high performance GPS Chipset
Very high sensitivity (Tracking Sensitivity: -159 dBm)
Extremely fast TTFF (Time To First Fix) at low signal level
Two serial ports
4Mb flash
Built-in LNA
Compact size (15mm * 13mm * 2.2mm) suitable for space-sensitive application
One size component, easy to mount on another PCB board
Support NMEA 0183 and SiRF binary protocol
Product Specifications
GPS Receiver
Chipset
SiRF GSC3f/LP
Frequency
L1, 1575.42 MHz
Code
C/A Code
Protocol
NMEA 0183 v3.0
Default:GGA,GSA,GSV,RMC
Support:VTG,GLL,ZDA)
SiRF binary and NMEA Command
Available Baud Rate
4,800 to 57,600 bps adjustable
The Specifications are subject to be changed without notice.
Page 2 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Channels
20
Flash
4Mbit
Sensitivity
Tracking:-159dBm
Cold Start
42 seconds, average
Warm Start
38 seconds, average
Hot Start
1 second, average
Reacquisition
0.1 second, average
Accuracy
Position: 10 meters, 2D RMS
5 meters, 2D RMS, WAAS enabled
Velocity: 0.1 m/s
Time: 1us synchronized to GPS time
Maximum Altitude
< 18,000 meter
Maximum Velocity
< 515 meter/second
Maximum Acceleration
< 4G
Update Rate
1 Hz
DGPS
WAAS, EGNOS, MSAS
Datum
WGS-84
Interface
I/O Pins
2 serial ports
Physical Characteristic
Type
22-pin stamp holes
Dimensions
15 mm * 13mm * 2.2 mm ±0.2mm
DC Characteristics
Power Supply
3.3Vdc ± 5%
Backup Voltage
2.0 ~ 3.6Vdc
Power Consumption
Acquisition: 42mA
Environmental Range
Humidity Range
5% to 95% non-condensing
Operation Temperature
-30℃ to 85℃
Storage Temperature
-40℃ to 125℃
The Specifications are subject to be changed without notice.
Page 3 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
2. Technical Information
Block Diagram
Module Pin Assignment:
The Specifications are subject to be changed without notice.
Page 4 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Pin NO.
Pin Name
I/O
Version 1.0
Remark
1.
RXB
I
For user’s application (not currently used).
2.
TXB
O
For user’s application (not currently used).
3.
TIMEMARK
I/O
One pulse per second.
4.
TXA
O
This is the main transmits channel for outputting navigation and
measurement data to user’s navigation software or user written software.
Output TTL level, 0V ~ 2.85V.
5.
RXA
I
This is the main receive channel for receiving software commands to the
engine board from SiRFdemo software or from user written software.
6.
NC
7.
GPIO0
I/O
General purpose I/O
8.
GPIO1
I/O
General purpose I/O
9.
RF_PWR
CTR
RF Power ON/OFF.
10.
ON_OFF
I
Edge triggered soft on/off request. It must be low for normal application.
11.
VBAT
I
This is the battery backup input that powers the SRAM and RTC, The battery
voltage should be between 2.0v and 3.6
12.
VCC
PWR
13.
GPIO13
I/O
General purpose I/O
14.
GPIO14
I/O
General purpose I/O
15.
GPIO15
O
GPS status output.
16.
BOOTSEL
I/O
Set this pin to high for programming flash.
17.
VCC_RF
18.
GND
G
Ground.
19.
RF IN
RF
GPS antenna input.
20.
GND
G
Ground.
21.
GND
G
Ground.
22.
GND
G
Ground.
NC
PWR
Main power supply to the engine board.
Regulated RF power output.
The Specifications are subject to be changed without notice.
Page 5 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Application Circuit
GPS_3V3
A1
GPS_ANTENNA
1
R7
10K
1
L3
TXA
2
3
BLM18AG121SN1D
4
L4
5
RXA
BLM18AG121SN1D
21
6
7
8
9
10
RXB
GND
TXB
RF_IN
1PPS
GND
TXA
VCC_RF
RXA
BOOTSEL
M1
GND
EB-3531
NC
GND
GPIO15
GPIO0
GPIO14
GPIO1
GPIO13
RF_PWR
VCC
ON_OFF
VBAT
20
19
18
17
16
22
15
14
13
GPS_3V3
12
11
C7
GPS_3V3
10UF
C6
RB521S
0.1UF
R6
270R
1
1
1UF
2
C5
2
2
D1
D2
1
1
RB512S
BATTERY
2
MS518S-FL35E
G PS PO WER
VIN
L1
U1
1
2
3
C1
VIN VOUT
GND
CE
NC
GPS_3V3
5
BLM18AG121SN1D
4
C2
C3
10UF/16V
470PF
XC6209B332MRN 3.3V
22UF/10V
GPS Active Antenna Specifications (Recommendation)
Frequency: 1575.42 + 2MHz
Axial Ratio: 3 dB Typical
Output Impedance: 50Ω
Polarization: RHCP
Amplifier Gain: 18~22dB Typical
Output VSWR: 2.0 Max.
Noise Figure: 2.0 dB Max
Antenna Input Voltage: 2.85V (Typ.)
The Specifications are subject to be changed without notice.
Page 6 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Dimensions
The Specifications are subject to be changed without notice.
Page 7 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Recommend Layout PAD
Tolerances : ±0.1mm
The Specifications are subject to be changed without notice.
Page 8 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
EB-3531 Application guideline
Application Circuit
1.
GPS_3V3
R7
10K
4
L4
5
RXA
BLM18AG121SN1D
21
6
7
8
9
10
GND
TXB
RF_IN
1PPS
GND
TXA
VCC_RF
RXA
BOOTSEL
M1
GND
GND
EB-3531
NC
GPIO15
GPIO0
GPIO14
GPIO1
GPIO13
RF_PWR
VCC
ON_OFF
VBAT
19
1
24-20003-12030N
1
2
3
BLM18AG121SN1D
RXB
RF Switch
18
17
2
TXA
2
50 Ohm Micro strip line
16
50 Ohm Micro
strip line
1
L3
20
22
J1_I-PEX connect
15
External antenna
14
13
2
1
GPS_3V3
12
11
C7
10UF
GPS_3V3
C5
RB521S
0.1UF
R6
270R
1
1
1UF
C6
2
2
2
D1
D2
1
1
RB512S
BATTERY
2
MS518S-FL35E
2.
GPS POWER
VIN
L1
U1
1
2
3
C1
VIN VOUT
GND
CE
NC
GPS_3V3
5
BLM18AG121SN1D
4
C2
C3
10UF/16V
470PF
XC6209B332MRN 3.3V
22UF/10V
The Specifications are subject to be changed without notice.
Page 9 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Layout Rules
Do not routing the other signal or power trace under the engine board.
* RF:
This pin receives signal of GPS analog via external active antenna. It has to be a controlled
impedance trace at 50ohm.
Do not place the RF traces close to the other signal path and not routing it on the top layer.
Keep the RF traces as short as possible.
* Antenna:
Keep the active antenna on the top of your system and confirm the antenna radiation pattern、axial
ratio、power gain、noise figure、VSWR are correct when you Setup the antenna in your case.
GPS Passive (or Active ) Antenna Specifications (Recommendation)
Frequency: 1575.42±2 MHz
Axial Ratio: 3 dB Typical
Output Impedance: 50Ω
Polarization: RHCP
Output VSWR: 1.5 Max.
Active option
Low Noise Amplifier:
Amplifier Gain :18~22dB Typical
Output VSWR: 2.0 Max.
Noise Figure: 2.0 dB Max.
Antenna Input Voltage : 2.85V Typical
The Specifications are subject to be changed without notice.
Page 10 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Definition of Pin assignment
VCC
This is the main power supply to the engine board. (3.3Vdc ± 5%)
GND
Ground pin for the baseband circuit.
RXA
This is the main channel for receiving software commands from SiRFdemo software or from your
proprietary software.
RXB
For user’s application (not currently used).
TXA
This is the main channel for transmitting navigation and measurement data to a navigation software
or user written software.
Output TTL level, 0V ~ 2.85V
TXB
For user’s application (not currently used).
RF_IN
This pin receives signal of GPS analog via external active antenna. It has to be a controlled
impedance trace at 50ohm. Do not have RF traces closed the other signal path and routing it on the
top layer.
Keep the RF traces as short as possible.
VBAT
This is the battery backup power input for the SRAM and RTC when main power is removed.
Typically, the current draw is 15uA. Without the external backup battery, the module/engine board
will always execute a cold star after turning on. To achieve the faster start-up offered by a hot or
warm start, a battery backup must be connected. The battery voltage should be between 2.0v and
3.6v.
The Specifications are subject to be changed without notice.
Page 11 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
GPIO
User can use this I/O pin for special functions. (For example, control LED)
BOOTSEL
Set this pin to high for programming flash.
VCC_RF
Provide Active Antenna Power 2.85V
ON_OFF
Edge triggered soft on/off request. It must be low for normal application.
GPIO15
GPS status output. You can connect it to an LED.
Tracking:
Fixing: Hi
RF_PWR_CTRL
RF power ON/OFF control:
Hi : RF Power ON
Low : RF Power OFF
The Specifications are subject to be changed without notice.
Page 12 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
EB-3531 Demo Kit Test Description
Connect J2 of the demo kit (Male) to J5 of the Test Board (Female) as the diagram below.
Pin Assignment:
The Specifications are subject to be changed without notice.
Page 13 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
J2:
Pin
Signal Name
Pin
Signal Name
1
NC
2
VCC
3
NC
4
VCC
5
NC
6
NC
7
NC
8
NC
9
NC
10
GND
11
TXA
12
RXA
13
GND
14
TXB
15
RXB
16
GND
17
NC
18
GND
19
NC
20
NC
Pin
Signal Name
Pin
Signal Name
1
TIMEMARK
2
VCC_RF
3
NC
4
GPIO15
5
GPIO0
6
GPIO14
7
GPIO1
8
GPIO13
9
RF_PWR
10
NC
11
NC
12
NC
13
NC
14
NC
15
NC
16
NC
17
NC
18
NC
19
NC
20
NC
J3
JP1: VBAT
The Specifications are subject to be changed without notice.
Page 14 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Test Software (GPSinfo):
1. Select COM Port & Baud Rate
2. Press Start GPS
The Specifications are subject to be changed without notice.
Page 15 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
SOFTWARE COMMAND
NMEA Output Command
GGA-Global Positioning System Fixed Data
Table B-2 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 B-2 GGA Data Format
Name
Example
Message ID
UTC Time
Latitude
N/S Indicator
Longitude
E/W Indicator
Position Fix Indicator
Satellites Used
HDOP
MSL Altitude1
Units
Geoid Separation1
Units
Age of Diff. Corr.
Diff. Ref. Station ID
Checksum
<CR><LF>
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
07
1.0
9.0
M
M
Units
Description
GGA protocol header
hhmmss.sss
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
See Table B-3
Range 0 to 12
Horizontal Dilution of Precision
meters
meters
meters
meters
second
Null fields when DGPS is not used
0000
*18
End of message termination
SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights.
Table B-3 Position Fix Indicator
Value
Description
0
Fix not available or invalid
1
GPS SPS Mode, fix valid
2
Differential GPS, SPS Mode , fix valid
3
GPS PPS Mode, fix valid
GLL-Geographic Position-Latitude/Longitude
Table B-4 contains the values for the following example:
$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C
The Specifications are subject to be changed without notice.
Page 16 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Table B-4 GLL Data Format
Name
Message ID
Latitude
N/S Indicator
Longitude
E/W Indicator
UTC Position
Status
Checksum
<CR><LF>
Example
$GPGLL
3723.2475
n
12158.3416
W
161229.487
A
*2C
Units
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
End of message termination
GSA-GNSS DOP and Active Satellites
Table B-5 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 B-5 GSA Data Format
Name
Message ID
Mode1
Mode2
Satellite Used1
Satellite Used1
…..
Satellite Used1
PDOP
HDOP
VDOP
Checksum
<CR><LF>
Example
$GPGSA
A
3
07
02
Units
Description
GSA protocol header
See Table B-6
See Table B-7
Sv on Channel 1
Sv on Channel 2
Sv on Channel 12
Position dilution of Precision
Horizontal dilution of Precision
Vertical dilution of Precision
1.8
1.0
1.5
*33
1.
End of message termination
Satellite used in solution.
Table B-6 Mode1
Value
M
A
Description
Manual-forced to operate in 2D or 3D mode
2Dautomatic-allowed to automatically switch 2D/3D
Table B-7 Mode 2
Value
1
2
3
Description
Fix Not Available
2D
3D
GSV-GNSS Satellites in View
Table B-8 contains the values for the following example:
The Specifications are subject to be changed without notice.
Page 17 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
$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 B-8 GSV Data Format
Name
Message ID
Number of Messages1
Message Number1
Satellites in View
Satellite ID
Elevation
Azimuth
SNR(C/No)
…….
Satellite ID
Elevation
Azimuth
SNR(C/No)
Checksum
<CR><LF>
Example
$GPGSV
2
1
07
07
79
048
42
27
27
138
42
*71
Description
GSV protocol header
Range 1 to 3
Range 1 to 3
degrees
degrees
dBHz
Degrees
Degrees
dBHz
Channel 1(Range 1 to 32)
Channel 1(Maximum90)
Channel 1(True, Range 0 to 359)
Range 0 to 99,null when not tracking
…….
Channel 4 (Range 1 to 32)
Channel 4(Maximum90)
Channel 4(True, Range 0 to 359)
Range 0 to 99,null when not tracking
End of message termination
Depending on the number of satellites tracked multiple messages of GSV data may be required.
RMC-Recommended Minimum Specific GNSS Data
Table B-10 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,*10
Table B-10 RMC Data Format
Name
Example
Units
Description
Message ID
$GPRMC
RMC protocol header
UTC Time
161229.487
hhmmss.sss
Status
A
A=data valid or V=data not valid
Latitude
3723.2475
ddmm.mmmm
N/S Indicator
N
N=north or S=south
Longitude
12158.3416
dddmm.mmmm
E/W Indicator
W
E=east or W=west
Speed Over Ground
0.13
knots
Course Over Ground
309.62
degrees
True
Date
120598
ddmmyy
Magnetic Variation2
degrees
E=east or W=west
Checksum
*10
<CR><LF>
End of message termination
SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS48 directions.
The Specifications are subject to be changed without notice.
Page 18 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
VTG-Course Over Ground and Ground Speed
$GPVTG,309.62,T,,M,0.13,N,0.2,K*6E
Name
Example
Message ID
Course
Reference
Course
Reference
Speed
Units
Speed
Units
Checksum
<CR><LF>
2.2
$GPVTG
309.62
T
Units
degrees
degrees
M
0.13
N
0.2
K
*6E
knots
Km/hr
Description
VTG protocol header
Measured heading
True
Measured heading
Magnetic
Measured horizontal speed
Knots
Measured horizontal speed
Kilometers per hour
End of message termination
NMEA Input Command
A). Set Serial Port
ID:100 Set PORTA parameters and protocol
This command message is used to set the protocol(SiRF Binary, NMEA, or USER1) and/or the
communication parameters(baud, data bits, stop bits, parity). Generally,this command would be used to
switch the module back to SiRF Binary protocol mode where a more extensive command message set is
available. For example,to change navigation parameters. When a valid message is received,the parameters
will be stored in battery backed SRAM and then the receiver will restart using the saved parameters.
Format:
$PSRF100,<protocol>,<baud>,<DataBits>,<StopBits>,<Parity>*CKSUM
<CR><LF>
<protocol>
<baud>
<DataBits>
<StopBits>
0=SiRF Binary, 1=NMEA, 4=USER1
1200, 2400, 4800, 9600, 19200, 38400
8,7. Note that SiRF protocol is only valid f8 Data bits
0,1
The Specifications are subject to be changed without notice.
Page 19 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
<Parity>
Version 1.0
0=None, 1=Odd, 2=Even
Example 1: Switch to SiRF Binary protocol at 9600,8,N,1
$PSRF100,0,9600,8,1,0*0C<CR><LF>
Example 2: Switch to User1 protocol at 38400,8,N,1
$PSRF100,4,38400,8,1,0*38<CR><LF>
**Checksum Field: The absolute value calculated by exclusive-OR the 8 data bits of
each character in the Sentence,between, but excluding “$” and “*”. The
hexadecimal value of the most significant and least significant 4 bits of the result are
convertted to two ASCII characters (0-9,A-F) for transmission. The most
significant character is transmitted first.
**<CR><LF>
: Hex 0D 0A
B). Navigation lnitialization ID:101 Parameters required for start
This command is used to initialize the module for a warm start, by providing current position (in X, Y, Z
coordinates),clock offset, and time. This enables the receiver to search for the correct satellite signals at
the correct signal parameters.
Correct initialization parameters will enable the receiver to acquire signals
more quickly, and thus, produce a faster navigational solution.
When a valid Navigation Initialization command is received, the receiver will restart using the input
parameters as a basis for satellite selection and acquisition.
Format:
$PSRF101,<X>,<Y>,<Z>,<ClkOffset>,<TimeOfWeek>,<WeekNo>,<chnlCount>,<ResetCfg>
*CKSUM<CR><LF>
<X>
<Y>
<Z>
X coordinate position
INT32
Y coordinate position
INT32
Z coordinate position
INT32
The Specifications are subject to be changed without notice.
Page 20 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
<ClkOffset>
Version 1.0
Clock offset of the receiver in Hz, Use 0 for last saved value
if available.
If this is unavailable, a default value of 75000
for GSP1, 95000 for GSP 1/LX will be used.
INT32
<TimeOf Week>
GPS Time Of Week
UINT32
<WeekNo>
GPS Week Number
UINT16
( Week No and Time Of Week calculation from UTC time)
<chnlCount>
Number of channels to use.1-12. If your CPU throughput
is not high enough, you could decrease needed
throughput by reducing the number of active channels
UBYTE
<ResetCfg>
bit mask
0×01=Data Valid warm/hotstarts=1
0×02=clear ephemeris warm start=1
0×04=clear memory. Cold start=1
UBYTE
The Specifications are subject to be changed without notice.
Page 21 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
Example: Start using known position and time.
$PSRF101,-2686700,-4304200,3851624,96000,497260,921,12,3*7F
C). Set DGPS Port
ID:102
Set PORT B parameters for DGPS input
This command is used to control Serial Port B that is an input only serial port
used to receive
RTCM differential corrections.
Differential receivers may output corrections using different
communication parameters.
The default
communication parameters for PORT B are 9600
Baud, 8data bits, 0 stop bits, and no parity.
If a DGPS receiver
is used which has different communication parameters, use this command to allow the receiver to
correctly decode the data.
When a valid message is received, the parameters will be stored in
battery backed SRAM and then the receiver will restart using the saved parameters.
Format:
$PSRF102,<Baud>,<DataBits>,<StopBits>,<Parity>*CKSUM<CR><LF>
<baud>
1200,2400,4800,9600,19200,38400
<DataBits>
8
<StopBits>
0,1
The Specifications are subject to be changed without notice.
Page 22 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
<Parity>
Version 1.0
0=None,Odd=1,Even=2
Example: Set DGPS Port to be 9600,8,N,1
$PSRF102,9600,8,1.0*12
D). Query/Rate Control
ID:103
Query standard NMEA message and/or set output rate
This command is used to control the output of standard NMEA message GGA, GLL, GSA,
GSV
RMC, VTG.
Using this command message, standard NMEA message may be polled once,
or
setup for periodic output. Checksums may also be enabled or disabled depending
on
the needs of the receiving program. NMEA message settings are saved in battery
backed memory for each entry when the message is accepted.
Format:
$PSRF103,<msg>,<mode>,<rate>,<cksumEnable>*CKSUM<CR><LF>
<msg>
0=GGA,1=GLL,2=GSA,3=GSV,4=RMC,5=VTG
<mode>
0=SetRate,1=Query
<rate>
Output every <rate>seconds, off=0,max=255
<cksumEnable>
0=disable Checksum,1=Enable checksum for specified
message
Example 1: Query the GGA message with checksum enabled
The Specifications are subject to be changed without notice.
Page 23 of 27
Copyright © 2007, GlobalSat Technology.
EB-3531
Version 1.0
$PSRF103,00,01,00,01*25
Example 2: Enable VTG message for a 1Hz constant output with checksum enabled
$PSRF103,05,00,01,01*20
Example 3: Disable VTG message
$PSRF103,05,00,00,01*21
E). LLA Navigation lnitialization ID:104
Parameters required to
start using Lat/Lon/Alt
This command is used to initialize the module for a warm start, by providing current position (in
Latitude, Longitude, Altitude coordinates), clock offset, and time.
This enables
to search for the correct satellite signals at the correct signal parameters.
the
Correct
receiver
initialization
parameters will enable the receiver to acquire signals more quickly, and thus, will produce a
faster navigational soution.
When a valid LLANavigationInitialization command is received,the receiver will restart using the
input parameters as a basis for satellite selection and acquisition.
Format:
$PSRF104,<Lat>,<Lon>,<Alt>,<ClkOffset>,<TimeOfWeek>,<WeekNo>,
<ChannelCount>, <ResetCfg>*CKSUM<CR><LF>
<Lat>
Latitude position, assumed positive north of equator and negative south of
The Specifications are subject to be changed without notice.
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equator float, possibly signed
<Lon>
Longitude position, it is assumed positive east of Greenwich
and negative west of Greenwich
Float, possibly signed
<Alt>
Altitude position
float, possibly signed
<ClkOffset>
Clock Offset of the receiver in Hz, use 0 for last saved value if available. If
this is unavailable, a default value of 75000 for GSP1, 95000 for GSP1/LX
will be used.
INT32
<TimeOfWeek>
GPS Time Of Week
UINT32
<WeekNo>
GPS Week Number
UINT16
<ChannelCount>
Number of channels to use. 1-12
UBYTE
<ResetCfg>
bit mask
0×01=Data Valid warm/hot starts=1
0×02=clear ephemeris warm start=1
The Specifications are subject to be changed without notice.
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0×04=clear memory. Cold start=1
UBYTE
Example: Start using known position and time.
$PSRF104,37.3875111,-121.97232,0,96000,237759,922,12,3*37
F). Development Data On/Off
ID:105
Switch Development Data Messages On/Off
Use this command to enable development debug information if you are having trouble getting
commands
enable
the
accepted.
user
Invalid commands will generate debug information that
should
to determine the source of the command rejection. Common reasons for
input command rejection are invalid checksum or parameter out of specified range. This setting is
not preserved across a module reset.
Format: $PSRF105,<debug>*CKSUM<CR><LF>
<debug>
0=Off,1=On
Example: Debug On
$PSRF105,1*3E
Example: Debug Off
$PSRF105,0*3F
G). Select Datum
ID:106
Selection of datum to be used for coordinate
Transformations
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. The default datum is WGS 84 (World Geodetic System 1984) which provides a
The Specifications are subject to be changed without notice.
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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.)
Examples:
Datum select TOKYO_MEAN
$PSRF106,178*32
The Specifications are subject to be changed without notice.
Page 27 of 27
Copyright © 2007, GlobalSat Technology.
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