Multi-Tech Systems MT3334ZDX Result Code Selection, Long Space Disconnect, Modem Reset

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DCD turns on when the remote modem’s carrier signal is detected and DCD is off when the carrier signal is not detected.

		3 - AT Commands, S-Registers and Result Codes
Command:	Xn	Result Code Selection
Values:	n = 0–4
Default:	4
Description:	X0	Basic Result Codes (e.g., CONNECT); does not
		look for dial tone or busy signal.
	X1	Extended Result Codes (CONNECT 33600 V42bis,
		etc.); does not look for dial tone or busy signal.
	X2	Extended Result Codes with NO DIALTONE; does
		not look for busy signal.
	X3	Extended Result Codes with BUSY; does not look
		for dial tone.
	X4	Extended Result Codes with NO DIALTONE and
		BUSY.
Command:	Yn	Long Space Disconnect
Values:	n = 0
Default:	0
Description:	Y0	Disable sending or responding to long space break
		signal on disconnect.
	Y1	Enable sending or responding to long space break
		signal on disconnect. (Not supported.)
Command:	Zn	Modem Reset
Values:	n = 0 or 1
Default:	None
Description:	Z0	Reset modem to profile saved by the last &W
		command.
	Z1	Same as Z0.
Command:	&Cn	Data Carrier Detect (DCD) Control
Values:	n = 0 or 1
Default:	1
Description: &C0		Ignores the state of carrier on the remote modem
		and DCD circuit is always on.
	&C1