48
SoundExpression
Extended AT Commands
Command Description
Data carrier detect (DCD) signal
AT&C0
Forces DCD signal to be on
at all times.
AT&C1
DCD on indicates presence
of data carrier. (default)
Data terminal ready (DTR) signal.
Interprets the ON to OFF transition of the
DTR signal from the DTE according to
the &Q settings.
AT&D0
&Q0,5,6. DTR ignored.
&Q1,4. Modem hangs up;
auto answer not affected.
&Q2,3. Modem hangs up;
auto answer inhibited.
AT&D1
&Q0,1,4-6. Asynchronous
escape sequence.
&Q2,3. Modem hangs up;
auto answer inhibited.
AT&D2
&Q0-6. Modem hangs up;
auto answer inhibited.
(default)
AT&D3
&Q0,1,4-6. Modem does a
soft reset as if the ATZ
command were received;
&Q2,3. Modem hangs up;
auto answer inhibited.
AT&F
Recalls factory defaults.
Instructs the modem to use
the factory set parameters.
Command Description
ERROR, DIAL TONE, NO
ANSWER and CONNECT
XXXX result codes.
ATX3
Enables monitoring of busy
tones; sends only OK,
CONNECT, RING, NO
CARRIER, ERROR, NO
DIALTONE, NO ANSWER
and CONNECT XXXX.
ATX4
Enables monitoring of busy
tones and sends all
messages. (default)
Control long space disconnect
ATY0
Disables long space
disconnect. (default)
ATY1
Enables long space connect.
Soft reset and restore profile
ATZ0
Restores stored profile 0.
ATZ1
Restores stored profile 1.
Escape Characters
+++
The escape characters are
known as
+++. They will
switch from on-line mode to
command mode while
preserving the connection
with the on line modem.
