RBVND-Lite Troubleshooting
From Elproma Wiki Knowledge Base
No connection with the modem
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 Power supply).
- check that the COM port is correct.
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)
- Check if the COM port is correctly parametrized
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.
Receiving NO CARRIER message 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 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.