Multi-Tech Systems MT5600SMI-P32, MT5600SMI-XL34 manual Command Rlsd DCD Option, Command DTR Option

			Chapter 5 – AT Commands, S-Registers, and Result Codes
Command:	&C	RLSD (DCD) Option
Description:		The modem controls the RLSD output in accordance with the parameter
		supplied. The parameter value, if valid, is written to S21 bit 5.
Default:		1
Defined Values:		0	RLSD remains ON at all times.
		1	RLSD follows the state of the carrier.
Result Codes:		OK
		Otherwise ERROR
Command:	&D	DTR Option
Description:		Interprets the ON to OFF transition of the DTR signal from the DTE in
		accordance with the parameter supplied. The parameter value, if valid, is
		written to S21 bits 3 and 4. Also, see S25.
Default:		2
Defined Values:		&D0	DTR drop is interpreted according to the current &Q setting as
			follows:
			&Q0, &Q5, &Q6: DTR is ignored (assumed ON). Allows operation
			with DTEs, which do not provide DTR.
			Q1 DTR drop causes the modem to hang up. Auto-answer is not
			affected.
			&Q2, &Q3 DTR drop causes the modem to hang up. Auto-answer is
			inhibited.
		&D1	DTR drop is interpreted according to the current &Q setting as
			follows:
			&Q0, &Q1, &Q5, &Q6 DTR drop is interpreted by the modem as if
			the asynchronous escape sequence had been entered. The modem
			returns to asynchronous Command State without disconnecting.
			&Q2, &Q3 DTR causes the modem to hang up Auto-answer is
			inhibited.
		&D2	DTR drop is interpreted according to the current &Q setting as
			follows:
			&Q0 through &Q6 drop caused the modem to hang up. Auto-answer
			is inhibited.
		&D3	DTR drop is interpreted according to the current &Q setting as
			follows:
			&Q0, &Q1, &Q5, &Q6 DTR drop causes the modem to perform a soft
			reset as if the Z command were received. The &Y setting determines
			which profile is loaded.
			&Q2, &Q3 DTR drop causes the modem to hang up. Auto-answer is
			inhibited.
			If &Q5, &Q6, +FCLASS=1 or +FCLASS=2 is in effect, the action
			taken is the same as for &Q0.
Command:	&K	Flow Control
Description:		Defines the DTE/DCE (terminal/modem) flow control mechanism. The
		parameter value, if valid, is written to S39 bits 0, 1, and 2.
Default:		3 (for data modem modes)
Defined Values:		0	Disables flow control.
		3	Enables RTS/CTS flow control.
		4	Enables XON/XOFF flow control.
		5	Enables transparent XON/XOFF flow control.
		Note: Upon reset, both RTS/CTS and XON/XOFF flow control is enabled
			for fax modem and voice modes.
Result Codes:		OK
		Otherwise ERROR

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 38