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W 1 Report line speed, error correction protocol,
and DTE speed.
W2 Report DCE speed only
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 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 profile 0
Z1 Reset and retrieve active profile 1
3.4 Extended AT Commands
&C_ &C0 Force Carrier Detect Signal High (ON)
&C1 Turn on CD when remote carrier is present
&D_ &D0 Modem ignores the DTR 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 Guard tone disabled
&G2 1800 Hz guard tone
&K_ &K0 Disable flow control
&K3 Enable RTS/CTS hardware flow control
&K4 Enable XON/XOFF software flow control
&K5 Enable transparent XON/XOFF flow control
&K6 Enable both RTS/CTS and XON/XOFF
flow control
&L_ &L0 Modem is set up for dial-up operation
&M_ &M0 Asynchronous operation
&P_ &P0 US setting for off-hook-to-on-hook ratio
&P1 UK and Hong Kong off-hook-to-on-hook
ratio