ComStar SVD Owner’s Manual
30
software’s COM port setting matches the modem’s COM port
setting.
The modem takes too long to hang up at the end of a call.
Your modem may not be receiving the required initialization string,
which should include the &C1 setting, from your software.
In your software, make sure you have selected your modem. If
not, select it and exit and restart your communications software.
If you still have problems, add &C1 to the initialization string and
exit and restart the software. (See “Tips for Selecting Setup
Options” in Chapter 2.)
You type an AT command line and press Enter, but your
modem fails to execute the command line.
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. For example, if the modem is
configured for COM4, the software should be configured for
COM4.
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.)
No response appears after executing a command.
If you typed a command but did not receive an OK response from
your modem:
Make sure the communications software and modem are
configured for the same COM port.
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
AT E1 Q0
and press Enter.
Be sure your modem is in terminal mode and not in data mode
when you type the command.
You receive an ERROR response when trying to execute a
command.
Check whether you typed the command correctly.
Check whether the command is a valid one.
