Troubleshooting
A-3
Issue 2 May 1995
Use Table A-2 to 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. Computer Connection
Symptom
Action
Modem does not
accept or echo back
AT commands
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 a 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 formats are listed on page 3-4.
G
that the computer’s data rate is supported by
the modem. Refer to the %B command on
page 4-18 for more information.
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.
