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Troubleshooting
Symptom
Modem keeps dropping connection.
Modem does not respond to hang-up command from the software’s command mode.
Computer screen appears distorted.
Troubleshooting Tips
Check the signal strength and signal quality icon to be sure the signal is not weak or poor.
Make sure that:
• The Drop DTR on Hang-up is enabled in the communication software.
• The hang-up string setting is
‘+++ATH’.
Turn off Auto Baud by initiating AT+IPR command. Make sure that the baud rate setting in your communication software matches the baud rate setting of the modem.
Turn on Local Echo by initiating the ATE1 command.
No characters are displayed on the computer screen
Images transmitted/received are of poor quality.
Ensure that the RTS/CTS flow control is enabled in the communication software and is set to &K3.
Error Messages
The following table outlines error messages that you may receive when sending or receiving data. These error messages will appear on the computer screen
Message
ERROR
Explanation
• The command was not recognized.
• The command line maximum length was exceeded.
RFM-4002-5015 Rev 3 93
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