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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
The modem ignores DTR.
AT&D1
The modem switches from data mode to command mode when an
on-to-off transition of DTR occurs.
AT&D2
An off-to-on transition of DTR causes the modem to go on-hook (hang
up) and disable auto-answer mode. Auto-answer mode (when S0 is
not equal to zero) is enabled when DTR is turned on. (DEFAULT)
AT&D3
An off-to-on transition of DTR re-initializes the modem. This performs a
power-up reset, except that the UART registers are not re-configured.
Load Factory Defaults
AT&F
Recalls factory defaults. Instructs the modem to use the factory-set
parameters.
Guard Tone Options
.
Controls whether or not guard tones while connected to a
remote modem. Guard tones may be required in some countries but are not needed in
the United States.
AT&G0
Guard tone disabled. (DEFAULT)
AT&G1
550-Hz guard tone enabled.
AT&G2
1800-Hz guard tone enabled.
Modem Command Reference
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