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15-4
C
HAPTER
15: T
ROUBLESHOOTING
Problems that
Occur After
Connecting
Your screen displays random or "garbage" characters
Make sure that the Business Modem is set to the same bit rate, word
length, parity, and number of Stop bits as the device to which you are
connecting.
If the settings are correct, the problem may be with the phone line. Try
the following measures:
■
Place the call again. The phone company routes even local calls
differently each time you call.
■
Call a different device to see if the problem persists. The problem may
be with the device you first tried to call.
If the modem is set to a fixed serial port rate (&B1) and your software is
fixed at 19.2K, 38.4K, 57.6K, or 115.2K bps, the reason may be one of
the following:
■
Your computer may not support the higher serial port rate. If this is
the case, fix your software rate at 9600 bps.
■
If you use memory-resident programs (TSRs-Terminate and Stay
Resident programs) or disk-caching programs, they may be interfering.
Try disabling them before you run your communications software.
■
Check that your software and the Business Modem are set for the
same kind of flow control, either hardware or software. Some
communications programs also require that you disable the type you
are not using.
Many CRC errors
■
Send AT&F1 to enable hardware flow control and other optimized
settings.
■
Try a different file transfer protocol (use ZMODEM if it's available to
you)
■
If you use memory-resident programs (TSRs-Terminate and Stay
Resident programs) or disk-caching programs, they may be interfering.
Try disabling them before you run your communications software.