9. Troubleshooting
9.1 No connection/communication with the modem
If there is no communication with the modem do the following steps:
Check all external connections of the modem (RS-232 or USB, Power supply)
Verify if power supply is correct (see Power supply)
Check if COM port is correctly parametrized
Check if program used for communication works properly and if there is none other
program interfering. If yes close the interfering program.
9.2 Receiving ERROR message
Modem answers ERROR on AT command in following cases:
Syntax of typed AT command is incorrect – check the command syntax in [1]
Parameters of typed AT command are incorrect – type AT+CMEE=1 for enabling
wide description of error which occurred. The response now will be in format:
ERROR
+CME ERROR: <err>
where <err> is a description of error which has occurred
Refer to [1] for further details about occurred error
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