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18 PCI Modem User’s Guide
Problem
The software cannot find the modem and the modem does not
respond to AT commands. (The following comment applies to
many other problems as well.)
Solution
The most common error with modems is that the communica-
tions software is not configured for the same COM port as the
modem. Check which COM port the modem is using. Make sure
that the software’s COM port setting matches the modem’s COM
port setting.
Another problem is that COM port resources may be in use by
another device. Make sure that the COM port resources used by
the modem are not being used by any other device, such as a
soundcard.
Problem
You type an AT command line in a terminal application and press
Enter
, but your modem fails to execute the command line. Or
there was no response after executing a command.
Solution
Be sure you type
AT
at the beginning of the command line.
Make sure the communications software is configured for the
same COM port as your modem.
Be sure your modem is not in data mode when you type the
command. Use the escape character sequence to switch to ter-
minal (or command) mode (The default escape sequence is to
wait at least one second, type
+++
, and wait another second or
more.)
If you typed a command but did not receive an
OK
response
from your modem, the
E0
and
Q1
commands may be in effect,
disabling echo and responses. Verify this with the
&V
command.
To enable echo and responses, type
ATE1Q0
and press
Enter
.