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Troubleshooting
RFM-4002-5015 Rev 3
93
Symptom Troubleshooting Tips
Modem keeps
dropping connection.
Check the signal strength and signal
quality icon to be sure the signal is not
weak or poor.
Modem does not
respond to hang-up
command from the
software’s command
mode.
Make sure that:
• The Drop DTR on Hang-up is enabled
in the communication software.
• The hang-up string setting is
‘+++ATH’.
Computer screen
appears distorted.
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.
No characters are
displayed on the
computer screen
Turn on Local Echo by initiating the ATE1
command.
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 Explanation
ERROR
• The command was not recognized.
• The command line maximum length
was exceeded.