Siemens M1 - Manual (Page 69)

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gsm-m1-e.fm GSM M1 Module, English: A24859-N4000-A100-1-7677
Technical reference section
26.2.96
Software test loops
If you can still address your GSM module with your communication program, check
module functioning using the software test loops. Each test is initiated by means of an
AT command. Be sure to perform the tests in the sequence described.
You can terminate an active test at any time:
Step 1: Enter the escape command “+++“ . The GSM module
switches to command mode.
Step 2: Enter the AT&T0 command. The test is terminated.
Any commands that follow the AT&T0 command on the command line are ignored.
This test loop checks your GSM module and the mobile telephone. If this test is not
successfully completed, the problem is located in your GSM module or in a cable con-
nection. Start the test loop and enter a random test message via the keyboard. The
GSM module does not send this message to the distant station but, instead, receives
it itself. It returns the message to the computer, where it is displayed on the screen. If
the GSM module correctly echoes the test message to the computer, the module has
successfully completed the local digital test.
Please note:
You can initiate this test only if no connection is set up; otherwise, the GSM module
returns
ERROR .
Situation: Command mode, no connection.
Example:
Enter: AT&T1
GSM module: OK
Enter: ABC
GSM module: ABC
You can enter additional test data and check the echo.
Terminate this test by entering the following:
Enter: +++ Escape command
GSM module: OK Acknowledges escape command
Enter: AT&T0 Terminate test.
GSM module: OK Test terminated.
AT&Tn - Test functions
AT&T0 - Terminate an active test
AT&T1 - Initiate local digital test loop