Command
Function
V_
V0
Numeric responses
V1
Word responses
W_
W0
Report DTE speed only
W1
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
Extended AT commands
Command
Function
&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
Appendix A. Manual modem commands
A-3
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