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Chapter 6 – Troubleshooting
22 Multi-Tech Systems, Inc. MT9234ZBA-Series User Guide (S000387C)
Data Is Being Lost
• If you are using data compression and a high speed serial port, set the serial port baud rate to two to six times
the data rate.
• Make sure the flow control method you selected in software matches the method selected in the modem.
• Try entering the I11 command in online mode or the &V command in command mode to display information
about the last connection, making a screen print of the connection statistics, and checking for parameters that
might be unacceptable.
There Are Garbage Characters on the Monitor
• Your computer and the remote computer might be set to different word lengths, stop bits, or parities. If you have
connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communication software.
• You might be experiencing line noise. Enable error correction, if it is disabled, or hang up and call again; you
might get a better connection the second time.
• At speeds above 2400 bps, the remote modem might not use the same transmission or error correction
standards as your modem. Try connecting at a slower speed or disabling error correction. (With no error
correction, however, line noise can cause garbage characters.)
• Try entering the I11 command in online mode or the &V command in command mode to display information
about the last connection, making a screen print of the connection statistics, and checking for parameters that
might be unacceptable.
The Modem Doesn’t Work with Caller ID
• Caller ID information is transmitted between the first and second rings, so if autoanswer is turned off (S0=0) or if
the modem is set to answer after only one ring (S0=1), the modem will not receive Caller ID information. Check
your initialization string, and if necessary change it to set the modem to answer after the second ring (S0=2).
• Make sure that you have Caller ID service from your telephone company.
Fax and Data Software Can’t Run at the Same Time
• Communication devices can be accessed by only one application at a time. In Windows 2000 and higher, you
can have data and fax communication applications open at the same time, but they cannot use the same
modem at the same time.