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Chapter 4 - AT Commands, S-Registers and Result Codes
Command: &Fn Load Factory Settings
Values: n = 0
Default: None
Description:&F0 Load factory settings as active configuration.
Note: See also the Z command.
Command: &Gn V.22bis Guard Tone Control
Values: n = 0, 1, or 2
Default: 0
Description:&G0 Disable guard tone.
&G1 Set guard tone to 550 Hz.
&G2 Set guard tone to 1800 Hz.
Note: The &G command is not used in North America.
Command: &Jn Auxiliary Relay Control
Values: n = 0
Default: 0
Description:&J0 The auxiliary relay is never closed.
&J1 Not supported—responds ERROR.
Command: &Kn Flow Control Selection
Values: n = 0, 3, or 4
Defaults: 3
Description:&K0 Disable flow control.
&K3 Enable CTS/RTS hardware flow control.
&K4 Enable XON/XOFF software flow control.
Command: &Mn Communications Mode
Values: n = 0
Defaults: 0
Description:&M0 Asynchronous mode.
&M1 Not supported—responds ERROR.
Command: &Qn Asynchronous Communications Mode
Values: n = 0, 5, 6, 8, or 9
Default: 5
Description:&Q0 Asynchronous with data buffering. Same as \N0.
&Q5 Error control with data buffering. Same as \N3.
&Q6 Asynchronous with data buffering. Same as \N0.
&Q8 MNP error control mode. If MNP error control is not established, the modem falls back ac-
cording to the setting in S36.
&Q9 V.42 or MNP error control mode. If neither error control is established, the modem falls
back according to the setting in S36.
Command: &Sn Data Set Ready (DSR) Control
Values: n = 0 or 1
Default: 0
Description:&S0 Force DSR always high (on).
&S1 Let DSR go high only during a connection.
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