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17-4
C
17: T
HAPTER
ROUBLESHOOTING
Problems that
Occur After
Connecting
Your screen displays random or "garbage" characters
Many CRC errors
and a Line Feed before and after the RING and CONNECT messages.
Sending the Quiet mode command, ATQ1, should solve the problem
Make sure that the Courier V.Everything 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 Courier V.Everything 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
Send AT&F1 to enable hardware flow control and other optimised
settings.
Try a different file transfer protocol (use ZMODEM if it's available t
you).
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