Multi-Tech Systems ISI5634PCI/4/8 Data Carrier Detect DCD Control, DataTerminalReadyDTRControl

	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 modem’s carrier signal
	is detected, and goes low when the carrier signal is not
	detected.
Command: &Dn	DataTerminalReady(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	LoadFactorySettings
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.

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