8
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
