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AT Command Set Operation
AT Command Reference Tables
This section provides a description of the basic and extended AT commands. They are in
alphabetical order, grouped with command variations, if any. All commands are assumed to be
preceded by an AT and followed by a carriage return. The only exception is the A/ command,
which is used to repeat the last AT command that was entered.
$
AT command setting
AT& command setting
&$
AT% command setting
%$
\$
AT\ command setting
AT: command setting
:$
AT* command setting
*$
S-Register command
S$
setting
AT-$ command setting
-$
A
Answer call
&A n
Auto fallback/fallforward
Auto-reliable fallback
%A n
character
\A n
Overspeed correction
Repeat command
A/
Auto Dial Restoral
&B n
%B n
Make busy
060R122-000
Issue 15
Displays the menu for the basic AT command set.
Displays the menu for the extended AT& command set.
Displays the menu for the extended AT% command set.
Displays the menu for the extended AT\ command set.
Displays the menu for the extended AT: command set.
Displays the menu for the extended AT* command set.
Display the S-Register menu.
Only S-Registers not containing bit mapped options will be displayed.
Displays the menu for the extended AT- command set.
Instructs the modem to answer an incoming call.
It is used to go off-hook and generate the proper answer sequence.
Controls the automatic fallback and fallforward capabilities.
Disables the fallforward/fallback feature.
&A0
&A1
Enables the fallforward/fallback feature.
Only functions when the modem is optioned for synchronous data mode or for
asynchronous with speed buffering, and only for V.34, V.32, and V.32 bis modes.
Selects the ASCII character number (0 - 127) that the modem uses with auto-answer
to negotiate an auto-reliable (\N3) error correcting link on the VF line. If the modem
detects two successive fallback characters, it will terminate the negotiation process
and go directly to a non-error correcting mode. The
which non-error correcting mode (wire or direct) the modem will fall back to, and what
will become of data transferred to the modem during the negotiation process.
Refer to the Appendix A for a listing of the
Selects overspeed correction for V.14 asynchronous data modes.
Selects 1.25% (nominal) overspeed correction.
\A0
\A1
Selects 2.5% (extended) overspeed correction.
Re-executes the most recent AT command line sent to the modem. This command
can instruct the modem to redial a previous number when a handshake attempt fails.
Controls Auto Dial Restoral.
&B0
Disables Auto Dial Restoral.
Enables Auto Dial Restoral, with line failure indicator.
&B1
Enables Auto Dial Restoral, without line failure indicator.
&B2
Controls the Make Busy option.
Make busy disabled.
%B0
Make busy on loss of DTR.
%B1
Make busy in ANALOOP (ITU-T V.54 Loop 3 test)
%B2
Make busy on loss of RTS, loss of DTR, or in ANALOOP (ITU-T V.54 Loop 3 test).
%B3
%B4
Make busy on loss of RTS.
SpectraComm Dual V.34 Modem
Installation and Operation
AT Command Reference Tables
\C
command determines
ASCII Character Set
.
4-3
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