3Com DIGITAL MODEM User Manual page 44

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PPENDIX
Follow these steps to use AT commands:
1 Launch your communications software.
Be sure your communications software is in terminal mode.
2 Be sure the digital modem is in command mode
(sometimes called local mode or terminal mode) so that it
interprets your commands.
When your computer is powered on, the digital modem
automatically starts in command mode. If you have recently
used the digital modem to make a call and have not yet
disconnected, type +++ to switch to command mode.
3 Type:
AT <commands> [Enter]
An AT command line starts with the characters AT. The
command line can accept up to 40 command characters in
the line (not including the two AT characters, spaces, or
[Enter]).
After completing its tasks, the 3Com Impact digital modem
sends a message to the screen.
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VERVIEW