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Troubleshooting
Table A-1. Modem Health
Symptom
Modem does not
respond
Use Table A-2 isolate problems with the connection between
your modem and computer. This table focuses on the modem
not accepting AT commands from the computer.
Table A-2. Modem — Computer Connection
Symptom
Modem does not
accept or echo
back AT
commands
A-2
Issue 1 November 1994
Action
Make sure the modem is properly seated in the
PCMCIA slot.
Make sure the PC is PCMCIA compliant.
Make sure the PC is turned ON.
Make sure that the COM port selected by the card
enabler on your PC is available and is not being used
by another device.
Reinstall the modem.
Action
Make sure that the communications software has the
correct COM port selected.
Make sure that the IRQ setting for the COM port is not
being used by any other COM ports.
Make sure that the communications software is set to
the DTE speed allowed by the modem.
Make sure that all AT commands are terminated with
a carriage return.
Use your communications software to verify:
G that the computer has a valid character format.
Valid format consists of 8 data bits with no parity
or 7 data bits with even, odd, mark or space
parity.
G that the computer's nominal data rate
(57,600 bps–300 bps) is supported by the
modem.
Issue the ATE1 command to make sure that
characters can be echoed back to your monitor. An
OK response should appear. Then, enter an AT and
carriage return to make sure characters display to
your monitor.
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