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9. Troubleshooting
9.1 No connection/communication with the modem
If there is no communication with the modem take the following steps:
•
Check all external connections of the modem (RS-232 or USB, Power supply)
•
Verify if the power supply is correct (see Power supply Power supply)
•
Check if the COM port is correctly parametrized
•
Check if the program used for communication works properly and if there is no
other program interfering. If yes, close the interfering program.
9.2 Receiving ERROR message
The modem answers ERROR on AT command in the following cases:
•
The syntax of typed AT commands 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 the error which has occurred
Refer to [1] for further details about the occurred error
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