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Chapter 4—AT Commands, S-Registers, Result Codes
Command: &Cn Data Carrier Detect (DCD) Control
Values: n = 0 or 1
Default: 1
Description: &C0 Forces the DCD circuit to be always high.
&C1 DCD goes high when the remote modems carrier signal
is detected, and goes low when the carrier signal is not
detected.
Command: &Dn Data Terminal Ready (DTR) Control
Values: n = 0, 1, 2, or 3
Default: 2
Description: &D0 Modem ignores the true status of the DTR signal and
responds as if it is always on.
&D1 If DTR drops while in online data mode, the modem en-
ters command mode, issues an OK, and remains con-
nected.
&D2 If DTR drops while in online data mode, the modem
hangs up. If the signal is not present, the modem will
not answer or dial.
&D3 If DTR drops, the modem hangs up and resets as if an
ATZ command were issued.
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.