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V_ V0 Numeric responses
V1 Word responses
X_ X0 Hayes Smartmodem 300 compatible
responses/blind dialing
X1 Same as X0 plus all CONNECT responses/
blind dialing
X2 Same as X1 plus dial tone detection
X3 Same as X1 plus busy signal detection/blind
dialing
X4 All responses and dial tone and busy signal
detection
Y_ Y0 Modem does not send or respond to break
signals
Y1 Modem sends break signal for four seconds
before disconnecting
Z_ Z0 Reset and retrieve active configuration
profile 0
Z1 Reset and retrieve active configuration
profile 1
3.4 Extended AT Commands
&C_ &C0 Force Carrier Detect Signal High (ON)
&C1 Turn on Carrier Detect signal when remote
carrier signal is present
&D_ &D0 Modem ignores the Data Terminal Ready
signal
&D1 Modem returns to Command Mode after DTR
toggle
&D2 Modem hangs up, returns to the Command
Mode after DTR toggle
&D3 Resets modem after DTR toggle
&F_ &F Recall factory default configuration
&G_ &G0 Guard tone disabled
&G1 550 Hz guard tone
&G2 1800 Hz guard tone
&M_ &M0 Asynchronous operation
&P_ &P0 United States setting for off-hook (make) -
to-on-hook (break) ratio
&P1 UK and Hong Kong off-hook (make)-to-on-
hook (break) ratio
&S_ &S0 Force DSR Signal High (ON)
&S1 DSR is off in command mode, on in on-line