Manual - U.S. Robotics

U.S. Robotics and the U.S. Robotics logo are U.S. Robotics registered
trademarks. V.Fast Class (V.FC) is a Rockwell international registered
trademark. Minitel and Télétel are France Telecom registered trademarks.
IBM, IBM PC, PC/XT and PC/AT are International Business Machines
Corporation trademarks. Microcom Networking Protocol (MNP) is a
Microcom Inc. registered trademark. AutoSync is a Hayes registered
trademark.
Table of Contents
CHAPTER 1- INSTALLATION
5
WorldPort PCMCIA V.34 CE Installation
5
CHAPTER 2 - USING THE MODEM
7
Installation Test
Factory Settings
Resetting the modem to the factory settings
Remarks on using the modem
7
8
8
9
CHAPTER 3 - IN CASE OF PROBLEMS
11
Problems and Solutions
If you are still having problems
11
13
APPENDIX A - TECHNICAL REFERENCE
15
Main AT commands
Basic command set
Extended command set
S-Registers
AutoSync
15
15
20
23
31
APPENDIX B - TECHNICAL SPECIFICATIONS
33
WorldPort PCMCIA V.34 CE Specifications
Electrical Power
Electro-magnetic Compatibility
33
34
34
GLOSSARY
33
Chapter 1- Installation
WorldPort PCMCIA V.34 CE Installation
Turn the computer and any connected peripheral devices off.
1. Locate the PCMCIA 2.0 compatible slot on the computer. Insert the
modem in its slot with the side on which the product name is shown
facing up.
NOTE: an arrow on the top side of the card shows the proper direction to
use for insertion.
2. The modem must be inserted deeply into the slot in order to connect it to
the pins located at the back of the casing.
Insertion of the WorldPort modem in the PCMCIA slot
3. Connect the DAA connector (telephone line interface) to the modem.
Modem User’s Manual
5
Connecting the DAA cable to the WorldPort modem
4. Plug the telephone connector to the wall jack.
The modem is now ready to be tested and used.
NOTE: To remove the modem from its slot, see the computer
documentation. Most computers have a button next to the slot to eject the
modem in the same way as when you remove a diskette from its drive.
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Modem User’s Manual
Chapter 2 - Using the MODEM
Installation Test
Follow this procedure to check that the modem works correctly.
1. Turn the computer on.
NOTE: Computers with PCMCIA ports have a program that initializes
the PCMCIA port as a serial port when a modem is inserted in it. Check
the computer documentation for further information.
2. Load and run the communications software. Check the software
installation manual for further information.
3. In the software, set the serial port rate to 38.400 bits per second (bps) for
a V.34 model (in some software, this is referred to as the 'baud rate’).
The modem will automatically detect this setting when you send a
command to it.
4. Specify the serial communications port used by the modem: COM1,
COM2 or other.
5. Set the data format to an 8 bit length with no parity or to a 7 bit length
with
even or odd parity - either one will do - and 1 stop bit.
6. Execute the function that authorizes sending AT commands to the
modem: in other words, put the computer in terminal mode.
Verify that the computer and the modem can communicate with each
other by sending the following ATtention command (you can type the
command either with uppercase or lowercase letters, but you must not
combine the two different types of letters). Press the Enter key (carriage
return) , indicated in the following example by the word Enter
surrounded
by brackets.
AT <Enter>
If everything is OK, the modem will respond with the following message:
OK
NOTE: If the command is not echoed back (AT is not displayed on the
screen), it means that local echo is turned off. In order to turn it on, send
the following command to the modem.
Modem User’s Manual
7
ATE1 <Enter>
If, on the contrary, the screen displays double characters, it means that
local echo is turned on both at the modem and in the software. Turn the
software local echo off, if such an option is available, or turn the modem
local echo off with the following command:
ATE0 <Enter>
Factory Settings
The modem has been pre-configured at the factory. In most cases, it will
work properly with these factory settings. But, if necessary, you can modify
them with the communication commands:
In order to display the present modem settings, do the following:
Run the communications program.
Go into the program's terminal mode.
Type:
AT &V <Enter>.
The modem will respond to this command by displaying a list of the
configuration settings. To modify them, please refer to Appendix A.
Resetting the modem to the factory settings
Some transmission sessions can modify the modem's configurations. If you
are unsure of the current configuration of the modem or if it seems to be not
working correctly, you might want to reset it to the factory settings.
To do this:
Run the communications program.
Go into the program's terminal mode.
Type:
AT&F<Enter>
This re-initialization includes resetting the hardware data control, setting a
fixed speed on the communication port and complete result codes.
On the other hand, some communications programs let you choose the
modem in a menu list. If you can't find your modem there, you can enter
this initialization string in the settings screen of the application.
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Modem User’s Manual
Remarks on using the modem
Remember the following points when you use the modem:
•
The modem might not work with all modular telephone sets.
Specifically, you must not use the modem with multi-line telephone sets,
sets with indicator lights or line selection buttons.
•
Some voice mail message systems use a specific tone to indicate that a
voice message has been received. The modem will not be able to dial
as long as this signal is on the line. Listen to the waiting messages in
order to get the normal dial tone back so that the modem can dial.
•
The modem has an automatic speed reduction function. This means
that it automatically reduces its data transmission speed in order to
match the speed of the remote modem. This also means that it may
take the modem up to 30 seconds to establish communications with a
slower modem.
•
A comma (,) in the dialed number causes a pause during dialing. You
can insert multiple commas in the command line in order to obtain a
longer pause.
•
The modem must detect a carrier within a specific time interval,
otherwise it will display the message ‘NO CARRIER’ or ‘NO ANSWER’.
You can increase this interval (in seconds) by going into the terminal
mode of the communications application and typing in:
AT S7 = [value].
Note: This value must be between 1 and 255 seconds (refer to the AT
command table for further details).
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10
Modem User’s Manual
Chapter 3 - In case of problems
Problems and Solutions
If you encounter problems even though you have followed the installation
and use instructions of the modem, refer to the following table that lists the
most common failures and their solutions.
Identifying the current problem
Symptom
Solution
The software
indicates that the
modem is not
installed
Check the software configuration. Make sure that it is
configured for the appropriate COM port (in most cases
it should be set to COM2). Check also that no other
application is using this same port. Check also that the
modem is properly inserted in its casing.
The modem
displays double
characters on the
terminal screen.
Both the modem and the application local echoes are
turned on. To turn local echo off type:
The modem
cannot make a call
and sends the
message ‘NO DIAL
TONE’.
Check the connection to the telephone line. It could be
that the modem cannot detect the dial tone. Insert a
comma (,) at the start of the dial sequence..
The modem does
not respond when,
in terminal mode,
you send AT
commands.
Check that the COMmunications port to which the
modem is connected is properly declared. Check the
IRQ configuration in the communications software or in
the Windows Control Panel. Check that the
application is in terminal mode.
ATE0 <Enter>
If none of the preceding solutions solve the problem, it
means that the modem is certainly in conflict at the
COM port/IRQ level. Begin the installation procedure in
the Installation chapter. Don't forget, if you change the
COM/IRQ configuration, to also make these changes in
the application.
Modem User’s Manual
11
There is no
audible tone when
you try to call.
The speaker is turned off; reset the modem's settings to
the factory settings.
The cables are not correctly connected. Check all
connections from the telephone wall jack to the modem.
There is a problem with the telephone line; check it using
a standard telephone set.
You are connected to an incompatible telephone network.
Refer to the section: ‘Utilization Notes’ in this manual.
The modem does
not respond to
incoming calls
Check that the application's auto-answer mode is turned
on.
The modem
connects to the
remote modem,
but the text
received is
illegible.
Incorrect software configuration. Check that the
transmission speed, the parity and the number of stop
bits defined in the software correspond to the settings of
the remote modem. Data compression could be used on
one of the modems and not on the other. Check the flow
control. If required, reconfigure the modem to the factory
settings.
Some office networks use a low voltage call signal that
the modem cannot recognize. Try connecting the
modem to a line that is not part of this type of network.
The modem
connects itself
correctly to the
remote modem,
but the connection
is interrupted
during
communications
with the message:
NO CARRIER.
Someone probably hung up from another extension.
Connection
problem with a
2400 bps modem.
Some older modem models will not connect when the
error correction protocol is on. Turn this protocol off with
the following command:
The modem detected a call waiting signal on the line.
Contact the local telecommunications agency to find out
how to turn this signal off when you use the modem.
Try calling another modem to check if the problem is
general or unique to one specific modem.
The telephone line is of low quality: try communicating at
a lower speed.
AT\N0 <Enter>
High speed data
transmission
(V.32 bis, V.34)
failed.
12
Check if there are any time-share applications or
programs working in parallel to the communications
application.
The quality of the telephone line is too low to withstand
high speed data transfer; decrease the modem's
transmission speed.
Modem User’s Manual
International
connections
cannot be made..
Because of the length of the number dialed and the
differences in telephone networks, it may be the case that
some digits do not get interpreted during the dialing
process. Insert commas between parts of the dialing
number in order to create pauses. For example, if you
are calling 0044628668476, insert commas and dial
00,44,628,668476 instead..
Calls to foreign
countries
terminate with a
‘NO CARRIER’
message.
Increase the amount of time to wait for a carrier signal.
In terminal mode, type ATS7=60 and press the Enter key.
The wait period is then set to 60 seconds.
Intercontinental
connections are
sometimes
interrupted.
If the telephone line's quality is low, it is best to reduce the
transmission speed in order to insure that the connection
remains stable.
During file
transfer, the
modem sends
back many
transmission
errors or a very
low transfer rate.
The telephone line is bad, select a lower transmission
speed.
During
transmission of a
fax errors alter its
legibility or cut off
the connection.
Check the modem's and the software's flow control.
Re-initialize the modem to the factory settings.
Change the transfer protocol.
Remove all terminate and stay resident programs (TSRs)
that could be active during the connection.
If the problem occurs during the transmission of a fax
from Windows or OS/2 check that the communications
driver that you are using is the one corresponding to the
environment that you use (Windows, OS/2), or the one
supplied specifically with the communications software.
If you are still having problems
•
Re- read this manual, especially the 'Utilization notes'.
•
Contact your reseller who will be able to provide you with the necessary
assistance. This is much more efficient and less costly than sending the
modem back to us for a problem that is possibly only a simple matter of
adjusting the settings.
Modem User’s Manual
13
14
Modem User’s Manual
Appendix A - Technical Reference
Main AT commands
1. Type the commands entirely in upper case or lower case but do not type
commands using a combination of the two cases.
2. All commands, with the exception of A/ and +++, are preceded by the
AT prefix and are executed after pressing the Enter/ Carriage Return
key (<Enter>).
3. The maximum length of a command is 40 characters. The modem
does not count the AT prefix character, the Enter key or spaces. On the
other hand, it does count punctuation marks such as dashes and
parentheses.
4. Any missing numeric parameter is considered to be equal to zero, for
instance the disconnect command: ATH <Enter>, is equivalent to ATH0
<Enter>.
BASIC COMMAND SET
Command Function
AT
ATtention: informs the modem that a command is being
given to it. This prefix must precede all commands,
except for A/, and +++.
&
Refer to the extended command set summary that
follows this basic command set section.
A
Forces the answer/ auto-answer mode. The modem
answers in answer mode when it detects a ring on the
telephone line and it sends an answer tone. If it does
not detect a carrier signal from a calling modem within
60 seconds, it goes off hook and the manual answer
mode is canceled. Pressing any key after the modem
answers, cancels manual answer and causes the
modem to go on hook.
A/
Re-executes the last command once. A/ does not
require the AT prefix nor the Enter key.
Modem User’s Manual
15
Bn
CCITT or BELL
B0
V.22 status, 1200 bps connection or V.21 connection at
300 bps.
B1
Bell 212A status, connection at 1200 bps or Bell 103
connection at 300 bps.
Dn
Dialing
DL
Re-dial the last number
DP Pulse (rotary) dial
DT
Tone dial (DTMF)
DS=n Dial the stored number
!
Flash: Rapid on hook
W
Wait for tone before dialing
@
Wait for a quiet answer
,
Pause during dialing
;
Return to command mode
En
Command Echo
E0
Turns echo off
E1
Turns echo on
Fn
Selecting modulation speed
F0
Auto detect mode (equivalent to N1)
F1
V.21 or Bell 103 indication
F2
Reserved
F3
V.23 indication
F4
V.22 or Bell 212A status: 1200 bps speed
F5
V.22 bis status: 2400 bps speed
F6
V.32 bis or V.32 status: 4800 bps
F7
V.32 bis status: 7200 bps
F8
V.32 bis or V.32 status: 9600 bps
F9
V.32 bis status: 12.000 bps
F10 V.32 bis status: 14.400 bps
Hn
Disconnect (on/off hook)
H0
On hook
H1
If already on hook, goes off hook and into command mode
In
Identification codes
I0
Product code
I1
ROM checksum
I2
Checksum and status
I3
Firmware version number
I4
Specific information
I5
Returns the country code
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Modem User’s Manual
I6
Returns the Data pump model
Modem User’s Manual
17
Ln
Speaker level control
L0
Low volume
L1
Low volume
L2
Medium volume
L3
High volume
Mn
Speaker control
M0 Turns the speaker off
M1 Speaker active until connection
M2 Speaker always active (during dialing and connection)
M3 Speaker inactive during dialing but active during connection
Nn
Automode control
N0
Turns automatic speed detection off
N1
Turns automatic speed detection on
On
Return on-line (from command mode)
O0 Return to data transmission mode
O1 Return to data transmission mode with resync request
P
Forces pulse dialing
Qn
Control codes display
Q0 Displays DTE code results
Q1 Inhibits DTE code results
Sn
Read/Write to the S register
Sn
Selects the n register as the default register
Sn=v Sets register n to v
Sn? Returns the value contained in register n
T
Forces tone dialing (DTMF).
Vn
Result code format
V0
Abbreviated format
V1
Long format
Wn
Connection control message
W0 Returns the DTE speed
W1 Returns the line speed, data correction protocol and DTE
speed
W2 Returns DCE speed
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Modem User’s Manual
Xn
Extended result codes
X0
Displays the basic status messages of the call, ex: OK,
CONNECT, RING, NO CARRIER, NO ANSWER and
ERROR
X1
Displays the basic status messages of the call and connection
speeds (OK, CONNECT, RING, NO CARRIER, NO
ANSWER, CONNECT XXXX, and ERROR.
X2
Displays the basic status messages of the call and connection
speeds(OK, CONNECT, RING, NO CARRIER, NO
ANSWER,
CONNECT XXXX, and ERROR.
X3
Displays the basic status messages of the call and
transmission rates (OK, CONNECT, RING, NO CARRIER,
NO
ANSWER, CONNECT XXXX, and ERROR.
X4
Displays all status messages of the call and connection
speeds
Yn
On hook upon reception of a long break
Y0
Deactivates on hook upon reception of a long break
Y1
Activates on hook upon reception of a long break
Zn
Software re-initialization and reset of the configuration
Z0
Re-initialization and reset of settings stored in profile 0
Z1
Re-initialization and reset of settings stored in profile 1
+MS=<mod>, [<automod>, <mini>, <maxi>].
Selection of modulation speed
<mod> specifies modulation (0,1,2,3,9,10,11, 64,69, 74).
<automod> Negotiation of forced or automatic modulation (0 or 1).
<mini>
specifies the minimum speed that the modem will connect at
(according to the modulations given below). <maxi> specifies the
maximum speed at which the modem will connect at. Example:
AT+MS=11,1,14.400,28.800
+MS? Returns the modem's current settings
+MS=? Returns the list of values accepted by the modem
+MS=0 V.21 indication
+MS=1 V.22 status: 1200 bps speed
+MS=2 V.22 bis status: 1200 or 2400 bps speed
+MS=3 V.23 status: E/R at 75/1200. Answer: E/R at 1200/75.
Always specify the speed at 1200 bps.
+MS=9 V.32 status: 9600 bps or 4800 bps
+MS=10 V.32 bis status: 14.400, 12.000, 9600, 7200 or 4800 bps
+MS=11 V34 status: 28.800, 26.400, 24.000, 21.600, 19.200,
16.800, 14.400, 12.000, 9600, 7200, 4800 or 2400 bps
+MS=64 Bell status 103 at 300 bps
Modem User’s Manual
19
+MS=69 Bell status 212 at 1200
+MS=74 V.FC status at 28.800, 26.400, 24.000, 21.600, 19.200,
16.800 or 14.400 bps
EXTENDED COMMAND SET
\An
MNP Block size
\A0 Configures MNP maximum block size to 64
\A1 Configures MNP maximum block size to 128
\A2 Configures MNP maximum block size to 192
\A3 Configures MNP maximum block size to 256
\Bn
Transmits break signals n times 100 ms.(from 1 to 9)
\Gn
Enables/disables the modem to modem flow control
(XON/XOFF)
\G0 Disables flow control between modems
\G1 Enables flow control between modems
\Kn
Types of Break to send to the modem
\Ln
MNP transfer mode
\L0 MNP stream mode
\L1 MNP block mode
\Nn
Mode selection
\N0 Selects normal speed, buffer mode
\N1 Selects direct mode
\N2 Selects error correction mode: Goes on hook in case of failure
\N3 Selects error correction mode: Switches to buffer mode in
case
of failure
\N4 Forces LAPM mode
\N5 Forces MNP mode
&Cn RLSD (DCD) Option
&C0 Forces the DCD signal to 'ON'
&C1 True DCD according to the carrier detect signal
&Dn DTR Option
&D0 DTR signal override
&D1 Returns to command mode on falling edge of DTR
&D2 Returns to command mode and goes on hook on falling edge
of DTR
&D3 Re-initializes the modem and loads the configuration profile
indicated by the &Y command
20
Modem User’s Manual
&Fn Load the factory settings
&F0 Load factory configuration profile 0
&F1 Load factory configuration profile 1
Modem User’s Manual
21
&Gn Set the guard tone
&G0 Turns the guard tone off
&G1 Turns the guard tone off
&G2 Sets the guard tone to 1800 Hz.
&Jn Telephone plug control
&J0 Sets bit 1 of the S21 register to be
&J1 compatible with the Hayes command set
&Kn Flow control
&K0 Turns flow control off
&K3 Turns RTS/CTS flow control on
&K4 Turns XON/XOFF flow control on
&K5 Transparent flow control XON/XOFF DTE/DCE.
&K6 Turns RTS/CTS and XON/XOFF flow controls on
&Pn Select pulse (rotary) dial make/break ratio
&P0 10 ips with 39%/61% ratio
&P1 10 ips with 33%/67% ratio
&P2 20 ips with 39%/61% ratio
&P3 20 ips with 33%/67% ratio
&Qn Synchronous/Asynchronous modes
&Q0 Select direct asynchronous mode
&Q4 Select AutoSync mode
&Q5 The modem negotiates a connection with error control
&Q6 Select asynchronous operation in normal mode
&Rn RTS / CTS option
&R0 CTS follows RTS
&R1 CTS is always active
&Sn DSR management
&S0 DSR is always active
&S1 True DSR.
&Vn Displays the current configuration
&V Displays the current configuration profile
&Wn Store the current configuration
&W0 Store the current profile in NVRAM as profile 0
&W1 Store the current profile in NVRAM as profile 1
&Yn Specifies the default re-initialization configuration profile
&Y0 Upon power up the configuration is set to profile 0
&Y1 Upon power up the configuration is set to profile 0
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Modem User’s Manual
&Zn=x Stores the dial string x (35 char.) in position n (0 to 4).
%Cn Turns data compression on/off
%C0 Turns data compression off
%C1 Sets data compression to MNP 5
%C2 Sets data compression to V.42 bis
%C3 Sets data compression to both V.42 bis and MNP 5.
S Registers
Default values are appropriate for most users. The settings are
modified with the ATSr=n command, where r is the number of the S
register and n is a decimal value between 0 and 255 (unless otherwise
stated).
Use ATSr? To examine the configuration of a register. For example:
ATS0? Enter
Reg
Default
S0
2
Sets the number of rings on which to answer in Auto
Answer Mode When set to 0, Auto Answer is
disabled. Accepted values are 0 or 2.
S1
0
Counts and stores the number of rings from an
incoming call. The range of acceptable values is
from 0 to 255.
S2
43
Stores the ASCII decimal code for the escape code
character. The default character is '+'. A value
between 128 and 255 disables the escape code.
The range of acceptable values is from 0 to 255.
S3
13
Stores the ASCII decimal code for the carriage
return character. The range of acceptable values is
from 0 to 127.
S4
10
Stores the ASCII decimal code for the new line
character. The range of acceptable values is from 0
to 127.
S5
8
Stores the ASCII decimal code for the back space
character. The range of acceptable values is from
to 32.
0
Function
Modem User’s Manual
23
Reg
Default
S6
8
Sets the number of seconds the modem waits
before dialing. If it is set to X2 or X4, the modem
ignores this register and dials as soon as it detects a
dial tone (fast dials). The range of acceptable values
is from 6 to 12.
S7
55
Sets the number of seconds the modem waits for a
carrier. May be set for a much longer duration if, for
example, the modem is making an international
connection. The range of acceptable values is from
36 to 58.
S8
option
2
Sets the duration, in seconds, for the pause (,)
in the Dial command. The range of acceptable
values is from 0 to 255.
S9
6
Sets the required duration, in tenths of a second, of
the remote modem’s carrier signal before
by the modem. The range of acceptable values is
from 0 to 255.
S10
14
during
loss
the
other
momentarily
remote
Sets the required delay, in tenths of a second,
which the modem waits before hanging up after
of the carrier signal. This guard delay is used by
modem to differentiate between interference or
disturbance that interrupts a connection
and the disconnection (going on hook ) of the
modem. This waiting interval is set to the value of
S10 minus the value of S9. In any event S10 must
be greater than S9 or the modem will disconnect
before recognizing the carrier signal.
NOTE: If you set S10 = 255, the modem will not
hang up if the carrier signal is lost. Removal of the
DTR signal will force the modem to hang up.
recognition
S11
Function
95
Sets the duration and spacing, in milliseconds, for
tone dialing. The range of acceptable values is
0 to 255.
S12
50
Sets the duration, in fiftieths of a second, of the
guard time for the escape code sequence (+++).
S13
-
from
24
Reserved
Modem User’s Manual
Reg
Default
Function
S14
170
S15
-
Reserved
S16
0
Bit-mapped register: see the instructions for register
S14.
Bit-mapped register. Select the bits that should be
set to one and set S14 to the decimal total of the
found binary value. For example, if you want to set
bits 7 (value = 128) and 5 (value = 32), the S14
register should be set to 160 decimal. In the same
way ATS14=17 set bit 0 (value = 1) and bit 4
(value = 16).
1
Echo command
(Er - 0 = E0, 1 = E1)
2
Quiet mode
(Qr - 0 = Q0, 1 = Q1)
3
Result codes
(Vr - 0 = V0, 1 = V1)
4
Reserved
5
Tone (T)/Pulse (P)
(0 =T, 1 = P)
6
Reserved
7
Send/Answer
(0 = Answer, 1 = Send
Bit
0
1
2
3
4-6
Val
2
4
8
-
Result
Reserved
Dialing test
Specifications test
Remote digital loopback
Reserved
S17
-
Reserved
S18
0
Sets the duration of attempts, in seconds, before the
modem returns to command mode. If the value is
set to 0, the test will not terminate automatically. It
will have to be stopped using the &T0 or H
command.
S19
0
AutoSync
S20
0
AutoSync
Modem User’s Manual
25
Reg
Default
S21
4
Function
V.24
Bit
0
Val
0
1
2
1
3-4
0
5
0
6
0
7
0
2=&D2,
Result
Depends on the &J0. 1=&J1
command
Reserved
Equivalent to &R1 CTS always on.
0=&R0 CTS follows RTS.
Equivalent to &D0. 1=&D1,
3=&D3
Equivalent to &C0, for what
concerns the DCD. 1=&c1
Equivalent to &S0, for what
concerns the DSR. 1=&S1
Equivalent to Y0. 1=Y1
S22
117
Speaker and results code
Bit
Val
Result
0-1
1
Equivalent to L1. 0 = Low, 2 =
Medium, 3 = High
2-3
1
Equivalent to M1. 0 = Off, 2 =
always active, 3+ = Active during
handshaking period
4-6
7
Equivalent to X4. 0=X0, 4=X1,
5=X2, 6=X3
7
Reserved
S23
54
General
Bit
Val
0
0
1-3
3
4-5
3
6-7
0
S24
26
0
Result
RDL not allowed
DTE speed set to 2400 bps
Default DTE parity
Equivalent to &G0.
Sets, in seconds, the duration of operation of the
modem, in normal mode, with no activity on the line
before going into sleep mode. The timer is reinitialized as soon as there is any activity on the line.
If S24 is set to 0, the sleep mode is disabled.
Modem User’s Manual
Reg
Default
Function
S25
5
Sets, in hundredths of second, the duration in which
the DTR signal must be off for the modem not to
interpret a random problem as a loss of the DTR
signal. (Most users will use the default value; this
register is useful to insure compatibility with older
models that use older operating software.)
S26
1
Reserved
S27
9
S28
0
Select asynchronous/synchronous mode
Bit
Val
Result
0,1,3
5
Equivalent to &Q5. 0=&Q0,
1=&Q1, 2=&Q2.
3=&Q3, 4=&Q4, 6=&Q6.
2
0
Reserved
4,5
0
Reserved
6
0
Equivalent to B0. 1=B1.
7
Reserved
Bit
0-2
3-4
Val
0
5
6-7
0
2=&P2,
Result
Reserved
Equivalent to &P0. 1=&P1,
3=&P3
Reserved
Equivalent to *H0. 1=*H1, 2=*H2.
S29
0
Duration of the inactive period after a flash
Sets the duration, in tenths of a second, before the
modem hangs up after a Flash. From 0 to 255 in
10 ms intervals.
S30
0
Sets the duration, in tenths of a second for the timer
to be inactive. The timer is activated when there is
no activity on the telephone line. At the end of this
period the modem goes on hook (hangs up). If
S30=0 the timer is disabled.
S31
2
Reserved
S32
17
S33
19
Stores the decimal ASCII code of the XON
character.
Stores the decimal ASCII code of the XON
character.
Modem User’s Manual
27
Reg
Default
S34
S35
S36
7
Reserved
Reserved
LAPM mode error control. Answer failure in LAPM.
The value indicates what will happen in case of
failure.
Bit
Value
Result
0-2
7
0 = On hook, 1 = Stays on line and
toggles to direct mode,
2 = Reserved, 3 = Stays on line
and toggles to standard mode, 4 =
Attempt to make an MNP
connection, go on hook in case of
failure, 5 = Attempt to make an
MNP connection, in case of
failure, toggles to direct mode, 6 =
Reserved, 7 = Attempt to make an
MNP connection, in case of failure,
toggles to normal mode.
3-7
Reserved
S37
0
Connection line speed. Identical to the 'F' or '+MS'
commands.
0
Attempt to connect at the maximum
speed (F0)
1-3
Attempt to connect at 300 bps
(+MS=0 or F1)
4
Reserved
5
Attempt to connect at 1200 bps
(+MS=1 or F4)
6
Attempt to connect at 2400 bps
(+MS=2 or F5)
7
Attempt to connect in V.23
(+MS=3 or F3)
8
Attempt to connect at 4800 bps
(+MS=9,1,,4800 or F6)
9
Attempt to connect at 9600 bps
(+MS=9,1,,9600 or F8)
10
Attempt to connect at 12.000 bps
(+MS=10,1,,12000 or F9)
28
Function
Modem User’s Manual
Reg
Default
Function
11
Attempt to connect at 14.400 bps
(+MS=10,1,,14.400 or F10)
Attempt to connect at 7200 bps
(+MS=11,1,,7200 or F7)
12
S38
S39
20
Sets, in seconds, an optional delay, before forcing
disconnection and erasing the transmission buffer
when the DTR signal is removed during a call with
error control. This allows a remote modem to
acknowledge reception of all data before being
disconnected.
The default value is set to 0: the modem goes on
hook immediately when the DTR signal falls.
3
Flow control
Bit
Value
0-2
3
3-7
S40
105
S41
131
-
Result
RTS/CTS Equivalent to &K3.
0 = No checking 4=&K4, 5=&K5,
6=&K6.
Reserved
Extended MNP functions
0-1
0
Disables the extended functions,
Equivalent to -K0. 1=-K1, 2=-K2.
2
0
Level setting
3-5
5
Equivalent to \K5. 0=\K0, 1=\K1,
2=\K2,3=\K3, 4=\K4.
6-7
1
MNP block size, Equivalent to \A1.
0=A0, 2=\A2, 3=\A3.
0-1
3
2 and 6
3
4
5
7
0
1
Equivalent to %C3. 0=%C0,
1=%C1, 2=%C2
Equivalent to %E0. 2=%E1,
64=%E2.
Reserved
Equivalent to \L0. 1=\L1
Reserved
Equivalent to -Q1. 0=-Q0.
Modem User’s Manual
29
Reg
Default
S46
138
S48
7
V.42 Protocol
0
= Deactivates the V.42 handshaking and
proceeds directly with the LAPM protocol
7
= Enables V.42 handshaking.
128
= Disables handshaking and detection and
takes into account the S36 register (can be
used to force an MNP connection).
S80
-
Reserved
S82
-
Break management. This register exists only for
compatibility reasons. Modifying this register will
have no effect.
S86
-
Result code on call failure reasons
0
= Normal disconnect
4
= Carrier loss
5
= Handshaking failure during connection
with the remote modem
9
= No common protocols
12 = Normal disconnect initiated by the remote
modem
13 = No answer after 10 re-transmissions of
the same message
13 = Protocol violation
S91-S92
30
Function
Data compression
136 = Error control without compression
138 = Error control with compression
Reserved
Modem User’s Manual
Reg
Default
S95
Function
44
Bit
0
Value
1
1
2
2
3
4
8
4
5
16
32
6
7
64
128
S99
-
Reserved
S202
-
Reserved
Result
CONNECT indicates the DCE
speed
Adds ARQ to CONNECT in error
control mode
Enables display of CARRIER xxxx
Enables display of PROTOCOL
xxxx
Reserved
Enables display of
COMPRESSION xxxx
Reserved
Reserved
AutoSync
Modems are traditionally divided into two categories:
• asynchronous modems that communicate with the PC via an
asynchronous coupler called UART,
• synchronous modems, interfaced with an asynchronous coupler (SCC,
USART, etc.).
The function of the couplers mentioned above is to transform, on a
computer, the 'parallel' data on 8 wires, byte by byte, into a flow of 'serial'
data composed of bits following each other on one wire.
According to whether the coupler is synchronous or asynchronous, the
parallel to serial conversion is performed in a different manner. For this
reason, a synchronous modem cannot interpret the data coming from a
remote asynchronous modem.
The function of AutoSync is to allow an asynchronous modem to dialog with
a synchronous modem by reconverting the asynchronous/synchronous data
coming from a PC. AutoSync provides synchronous transmissions via the
asynchronous port of the modem. Synchronous transmissions can be in bit
mode (HDLC, SDLC) or in character mode (VIP, etc.).
Modem User’s Manual
31
32
Modem User’s Manual
Appendix B - Technical
specifications
WorldPort PCMCIA V.34 CE Specifications
Compatibility
Data: ITU-T V.34, V.FC, V.32 bis, V.32, V.23, V.22 bis, V.22, V.21 and
Bell 212A ,103.
Fax: Transmission/reception Group III Fax, Class 1, Class 2;
ITU-T V.17, V.29, V.27 ter
Speeds: Data: 28.8K, 26.4K, 24K, 21.6K, 19.2K, 16.8K, 14.4K, 12K,
9600, 7200, 4800, 2400, 1200, 1200/75, 75/1200, 300 bps
Fax: 14.4K, 12K, 9600, 7200, 4800, 2400 bps
Error correction
ITU-T V.42, MNP 2-4
Data compression
ITU-T V.42 bis, MNP level 5 and 10
Serial port speed
115.200 bps maximum
Operation
Full/Half duplex
Format (DTE-DCE) Serial, binary, asynchronous, synchronous,
AutoSync Hayes protocol for synchronous
transmissions
Command set Compatible with the AT command set; Fax mode:
EIA 578 Class 1, TR 29 Class 2
Flow control XON/XOFF, RTS/CTS
Data interface Bus, 16.550 compatible (FIFO)
Connector
68-pin compatible PCMCIA 2.0-2.1
Telephone interface RJ11
Dialing Pulse, tone (DTMF 0-9, #, *)
Audio capability Speaker on host
Call status Dial tone, busy tone
Store configuration Non volatile memory storing two modem
configurations and four telephone numbers
Transmission level
Country specific
Reception sensitivity Country specific
Size
54 x 85,6 x 5 mm
Operating temperature
from 0 to 50 °C
Modem User’s Manual
33
Storage temperature from -40 to +70 °C
Transportation temperature from -40 to +70 °C
Operating humidity
from 20 to 80% without condensation
Storage humidity
from 5 to 90% without condensation
Operating altitude
3000 meters
Electrical Power
Before making connections, check the safety levels on the various
interfaces:
Telephone line connector = TRT
PCMCIA 2.0 connector = TBTS
These indications are classified as per security standard EN 60-950/A2
dated October 1993.
TBTS: Very Low Safety Voltage
TRT:
Telecommunications Network Voltage, voltages in compliance with
standard NF EN 41-003 dated July 1993 criteria.
Electro-magnetic Compatibility
This device complies with the following standards in accordance with the
European Directives 91/263/CEE and 89/336/CEE:
- Immunity EN50082-1 class B
- Transmission EN 55022
34
Modem User’s Manual
Glossary
ARQ
General term qualifying error correction protocols that detect errors and
automatically re-transmit the incorrect data blocks. See MNP and V.42.
ASCII
Acronym for American Standard Code for Information Interchange. 7 bit
binary code (0 and 1) used to represent letters, numbers and special
characters such as $,! and /.
Bit
A 0 or a 1 reflecting the use of a binary numbering system (a system
that consists of 2 values). This system is used because the computer
only recognizes two states, off or on.
(Start/Stop bits) Signaling bits attached to a character before it is
transmitted; used for asynchronous transmissions.
Bps
The rate in bits per second. Thousands of bits per second are
expressed as kilobits.
Cps
Data transfer rate (Characters per second). It is generally estimated
from the binary rate and the length of characters. For example, at 2400
bits/s, 8-bit characters with a start and stop bit (for a total of 10 bits per
character) are transmitted at an approximate rate of 240 characters per
second (cps). Some protocols, such as the error correction protocols in
the modem use advanced techniques requiring longer transmission
frames and data compression to increase the number of characters per
second.
Flow control
A method that compensates for differences in the data flow coming in to
and going out from a modem or other device. See RTS/CTS and
XON/XOFF
Error correction
Various techniques that check the reliability of the characters or data
blocks. The V.42 and MNP2-2, 10 error correction protocols use error
detection (using a CRC type control code) and re-transmit erroneous
frames (ARQ).
Modem User’s Manual
35
DCE
(Data Carrier Equipment) Termination equipment of the data circuit. In
this manual, this term applies to modems that establish and control the
data link on the telephone network.
Transmission rate
Number of bits transmitted per second (bit/s). Communications
channels using modems on telephone lines are set to binary rates,
generally 2400, 9600, 14.400 or 28.800.
Baud rate
Number of state transitions per second on a communications channel.
Even though it is incorrect from a strict technical point of view, the baud
rate is often used to indicate the transmission rate.
DTE
(Data Terminal Equipment) Data processing terminal equipment.
Generally, a computer or terminal generates data or is the final
destination of data.
Duplex
Defines a communications channel capable of transmitting signals in
both directions (half duplex or full duplex).
Full duplex: Simultaneous flow of signals in two directions. In microcomputer communications, full duplex can refer to suppressing the local
echo of transmitted characters..
Half Duplex: Signal flow in two directions, but only in one at a given
time. In micro-computer communications, half duplex can refer to
enabling of the local echo that causes the modem or the software to
send a copy of transmitted data to the screen of the transmitting
computer.
Remote Echo
A copy of the data received by the remote system is sent back to the
transmitting system and displayed on the screen. Remote echo is a
function of the remote system and is often used in full duplex
transmissions.
Local Echo
A function of the modem used to display keyboard command and
transmitted data on the screen. This function is provided with most
communications software.
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Modem User’s Manual
IRQ
Interrupt Request. In a computer, IRQs are used to temporarily interrupt
current processing when an event requires immediate attention, such as
for example, the arrival of data at the serial port.
LAPM
Link Access Procedure for Modems. Error correction protocol
incorporated in the ITU-T V.42 recommendation. Just like the MNP
protocols, LAPM uses cyclical redundancy check (CRC) and automatic
re-transmission of data (ARQ) to guarantee data reliability.
NVRAM
Non Volatile Random Access Memory which can be programmed by the
user with data that are stored when the modem is powered down. The
modem includes this kind of memory to store a default configuration
defined by the user and loaded into random access memory (RAM)
upon power up.
MNP
Microcom Networking Protocol. Error correction protocol developed by
Microcom, Inc. and now in the public domain. MNP protocol guarantees
error-free transmissions using error detection (CRC) and re-transmission
of incorrect data frames. The modem uses MNP 2-4 and MNP 5 error
correction and data compression techniques that are incorporated in
recommendation ITU-T V.42.
Data mode
Mode in which the fax/modem can send and receive data files. A
standard modem without facsimile capabilities is always in data mode.
Fax mode
Mode in which the fax/modem can transmit and receive facsimiles.
Terminal mode
Required simulation mode for computers to transmit data. In terminal
mode, the computer acts as though it were a dumb terminal rather than
a data processing unit. Keystrokes go directly to the modem whether
they are modem commands or data to be transmitted via the telephone
lines. Received data are displayed directly on the screen.
Modem User’s Manual
37
Parity
Error detection method that checks the correctness of transmitted
characters. Verification of characters has been replaced by more
reliable and efficient block control methods, including Xmodem types of
protocols and the ARQ protocol implemented in the modem. Two
communicating computers must use the same kind of parity.
Carrier
Continuous frequency that can be modulated or act as a support to
another data carrier signal. Carrier waves are generated and
maintained by modems via the telephone companies' transmission
lines.
Protocol
Set of rules and procedures describing communications between
different devices. Protocols vary, but communications equipment must
use the same protocol in order to exchange data. Data formats, the
ready to receive or transmit states, error detection and correction are
some of the operations that can be defined in protocols.
Fallback
(Rate adjustment). A function that lets rapid modems with error
correction control the line quality and fall back to a lower speed if it
becomes degraded. Modems go back to a higher speed if the line
quality improves.
RTS/CTS
Hardware check used to tell an intelligent device to stop or resume data
transmission.
Analog signals
Variable and continuous waves, such as voice tones carried by
telephone lines. Compare with digital signals.
Digital signals
Discrete and uniform signals. In this manual, the term refers to bits 0
and 1.
Buffer
An area of memory used as temporary storage during input/output
operations. The modem has, for example, a command buffer.
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Modem User’s Manual
Terminal
A unit whose keyboard and screen are used to send and receive data
via a communications link. A terminal differs from a micro-computer in
that it has very little or no internal processing capabilities.
Asynchronous transmission
Data transmission during which the time between transmission of
characters can vary. Since the time delays between characters are not
uniform, the receiving modem must be signaled when the start and end
of a characters data bits occur. Stop and start bits are therefore added
to each character transmitted.
Serial transmission
Sequential data transfer, one bit at a time, using only one electrical
circuit.
Synchronous transmission
Data transmission during which both communicating devices are
synchronized by a common clock. Using this mode eliminates the need
to systematically add a stop bit and a start bit to each transmitted
character.
Xmodem
The first of a family of error correction software protocols used to
transfer files between modems. These protocols are in the public
domain and are available on many servers. Ymodem and Zmodem are
later protocols.
XON/XOFF
Standard ASCII control characters used to tell an intelligent device to
stop or resume data transmission. In most systems, typing <Ctrl>-S
sends the XOFF character (which tells the remote device to stop
transmitting). Some equipment, including your modem, interpret <Ctrl>Q as XON (which tells the remote device to resume transmission),
others interpret touching any key after <Ctrl>-S as an XON.
Modem User’s Manual
39