Extended AT Commands

O1	Return to Data Mode and initiate an equalizer retrain
O2	Same as O1 with speed fall forward
O3	Same as O1 with speed fall backward

PSet Pulse dial as default

Q0	Modem sends responses
Q1	Modem does not send responses
Sr?	Read and display value in register r.
Sr=n	Set register r to value n (n = 0-255).
T	Set Tone Dial as default
V0	Numeric responses
V1	Word responses
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
Y0	Modem does not send or respond to break signals
Y1	Modem sends break signal for four seconds before
	disconnecting
Z0	Reset and retrieve active profile 0
Z1	Reset and retrieve active profile 1

Extended AT Commands
&C0	Force Carrier Detect Signal High (ON)
&C1	Turn on CD when remote carrier is present
&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
&E0	Disable automatic fall forward/back
&E1	Enable automatic fall forward/back
&F0	Recall factory default configuration (V.42bis/
	hardware flow control enabled)
&F1	Recall factory default with software flow control
	enabled
&F2	Recall factory default with hardware flow control
	enabled (same as &F)
&F3	Same as &F1 except for Macintosh computers (&F1