Tekst źródłowy strony Szablon:Troubleshooting

<b>No connection with the modem</b>

If there is no communication with the modem take the following steps:
* check all external connections with the modem (serial interfaces, USB, power supply).
* check that the power supply is correct (see [[{{{model}}} Connectors#Power supply connector|Power supply]]).
* check that the COM port is correct.
{{#ifeq: {{{model}}} | RB900SG | * when connecting the modem with the meter, check whether the meter is powered and the POWER diode in the modem is on.
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<b>No connection/communication with the modem</b>

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 [[{{{model}}} Connectors#Power supply connector|Power supply]])
* Check if the COM port is correctly parametrized
{{#ifeq: {{{model}}} | RB900SG | * Check if the program used for communication works properly and if there is no other program interfering. If yes, close the interfering program.
}}

<b>Receiving ERROR message</b>
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.

<b>Receiving NO CARRIER message</b>
There are some common cases when the modem answers NO CARRIER:
* If a data/voice/fax connection cannot be established
* Right after hanging up the data/voice/fax connection
* If there is no connection with the network – check antenna and registration status (see Network registration)
* If there is no power supply (see [[{{{model}}} Connectors#Power supply connector|Power supply]])
* If modem answers NO CARRIER, you can check extended error code using AT#CEERNET command. A list of codes can be found in AT commands reference guide manual.

[[Category:{{{model}}} User Manual]]