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Troubleshooting 17
Problem
:
You type an AT command line in a terminal applica-
tion and press Enter, but your modem fails to exe-
cute the command line. Or there was no response af-
ter executing a command.
Solution
:
Be sure you type
AT
at the beginning of the command
line.
If you type more than one AT command, type a semico-
lon (;) immediately after each one.
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 terminal 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
re-
sponse 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 re-
sponses, type
ATE1Q0
and press
Enter
.
Problem
:
The modem speaker volume is too low or too high.
Solution:
Your modem has a small speaker on board that provides
audible feedback of dial tones and remote connection
signals (“handshaking”). This is not the same as the
speaker that you may have connected to your sound
card.
If the software allows you to control the volume, make
sure the speaker is enabled and set to a comfortable
volume.
If the software does not have speaker settings, add one
of the
AT
commands listed below to the initialization
string: