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Extended AT commands
Command
&C_
&C0
&C1
&D0
&D_
&D1
&D2
&D3
&F
&F_
&G_
&G0
&G1
&G2
&K_
&K0
&K3
&K4
&K5
&K6
&M_
&M0
&P_
&P0
&P1
&P2
&P3
&R_
&R0
&R1
&S_
&S0
&S1
&T_
&T0
&T1
&T3
&T4
&T5
&T6
&T7
&T8
&V
&V0
Function
Force Carrier Detect Signal High (ON)
Turn on CD when remote carrier is present
Modem ignores the DTR signal
Modem returns to Command Mode after DTR
toggle
Modem hangs up, returns to the Command
Mode after DTR toggle
Resets modem after DTR toggle
Recall factory default configuration
Guard tone disabled
Guard tone disabled
1800 Hz guard tone
Disable flow control
Enable RTS/CTS hardware flow control
Enable XON/XOFF software flow control
Enable transparent XON/XOFF flow control
Enable both RTS/CTS and XON/XOFF flow
control
Asynchronous operation
US setting for off-hook-to-on-hook ratio
UK and Hong Kong off-hook-to-on-hook ratio
Same as &P0 setting but at 20 pulses per
minute
Same as &P1 setting but at 20 pulses per
minute
Reserved
CTS operates per flow control requirements
Force DSR Signal High (ON)
DSR off in command mode, on in on-line
mode
Ends test in progress
Perform Local Analog Loopback Test
Perform Local Digital Loopback Test
Grant Remote Digital Loopback Test request
by remote modem
Deny Remote Digital Loopback Test request
Perform a Remote Digital Loopback Test
Perform a Remote Digital Loopback Test and
Self-Test
Perform Local Analog Loopback Test and
Self-Test
Displays Active and Stored Profiles
Appendix C. Manual modem commands
43
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