Siemens M1 User Manual
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GSM M1 Module, English: A24859-N4000-A100-1-7677
gsm-m1-e.fm
Installation / startup
6.3.96
• Duplicate characters on screen
Cause:
Your communication program is set to half-duplex or echo.
Remedy: Enter ATE0 to deactivate command echo in command mode or
deactivate the echo in the communication program.
• Only the characters from the distant station are incorrect
Cause:
The GSM module’s data format does not match that of the distant sta-
tion.
Remedy:
Set the parameters in your communication program accordingly (data
bits, parity, stop bits to 8, N, 1).
Cause:
A cable has been disconnected.
Remedy: Make sure that all cables are securely connected. Tighten all connecting
screws.
Cause:
The GSM network does not or does not yet support the fax/data
modes. The GSM module returns
NO CARRIER
.
Remedy: Ask your network operator when these modes will be supported in
your network.
Cause:
The GSM module has activated barred dialing.
Remedy:
Switch the GSM module off and then on.
Cause:
Some fax programs that support TR-29.2 Class 2 expect the bits of the
fax code to arrive in an order different from the one defined in the
SP2388 specification. If the GSM module transmits the fax data bits to
the computer in the wrong order, the fax program cannot receive whole
fax pages. For this reason, the GSM module has been equipped with
the AT+FOPT=n command.
Remedy:
Enter one of the following two commands and then check whether the
system is functioning correctly: AT+FOPT=1,0 (bit order as specified in
TR-29.2 Class 2, Draft SP2388); AT+FOPT=1,1 (opposite bit order, fac-
tory configuration for all countries).
Cause:
The GSM network does not yet support the fax/data modes. The GSM
module returns
NO CARRIER
.
Remedy:
Ask your network operator when these services will be supported in
your network.
Cause:
Your network operator has not released your SIM card for the fax/data
modes.
Remedy:
Ask your network/service operator to release these features.
Incorrect characters on screen
GSM module does not dial
Cannot receive fax