Multi-Tech Systems MT5600DSVD - Manual (Page 59)

MultiModemDSVD User Guide 5 Solving Problems
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4 Make sure the flow control method you selected in software matches the method
selected in the modem. If you are using the modem with a Macintosh, you might
have the wrong cable for hardware flow control.
4 If you are running under Windows 3.1 and have a 16550AFN UART, you might
need to turn on the 16550’s data buffers and/or replace the Windows serial driv-
er, COMM.DRV.
4 Try entering the &V1 command 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
4 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 communications software.
4 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.
4 At speeds above 2400 bps, the remote modem might not use the same transmis-
sion 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.)
4 Try entering the &V1 command 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
4 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 ini-
tialization string, and if necessary change it to set the modem to answer after the
second ring (S0=2).
4 Make sure that you have Caller ID service from your telephone company.
Fax and Data Software Can’t Run at the Same Time
4 Communications devices can be accessed by only one application at a time. Un-
der DOS or Windows 3.1x, you can run either your fax software or your
datacomm software, but not both at the same time, unless you have a special
communications device management application. In Windows 95, you can have
data and fax communication applications open at the same time, but they cannot
use the same modem at the same time.