Digi 90000583_A manual There is no Nvram support currently

AT	Function	Result
Command		Code
	RTS/CTS Option
	This selects how the Digi Device Server controls CTS. CTS is modified if
	hardware flow control is selected (see &K command). The parameter value,
	if valid, is written to S21 bit2.
	&R0CTS reflects the ability of the modem to transmit data. For example,	OK n=0 or 1
AT&Rn	CTS will drop during retrains. In sync mode, CTS tracks the state of RTS;
		ERROR
	the RTS-to-CTS delay is defined by S26. In async mode, CTS is normally
		Otherwise
	ON and will turn OFF only if required by flow control.
	&R1CTS forced on (default). In sync mode, CTS is always ON (RTS transi-
	tions are ignored). tracks the state of RTS. In async mode, CTS is normally
	ON and will turn OFF only if required by flow control.
	&R2CTS follows RTS.
	DSR Override
	This command selects how the modem will control DSR. The parameter	OK n=0 or 1
AT&Sn	value, if valid, is written to S21 bit 6.
		ERROR
	&S0DSR will remain ON at all times. (Default.)
		Otherwise
	&S1DSR will become active after answer tone has been detected and inac-
	tive after the carrier has been lost.
AT&Tn	Accepted but ignored.	OK n= 0
		ERROR
		Otherwise
AT&V	Display Current Configuration and Stored Profiles	OK
	There is no NVRAM support currently.
AT&Vn	Accepted but ignored.	OK n=0 to 5
		ERROR
		Otherwise
AT&V6	Display current IP settings of the Device Server	OK
AT&Wn	Accepted but ignored.	OK n=0 or 1
		ERROR
		Otherwise
AT&Xn	Accepted but ignored.	OK n=0 or 1
		ERROR
		Otherwise
AT&Yn	Accepted but ignored.	OK n=0 or 1
		ERROR Other-
		wise
AT&Zn	&Zn=x - Store Telephone Number.	OK n=0 or 3
		ERROR
	Currently not supported
		Otherwise
AT\An	Accepted but ignored.	OK n=0 to 3
		ERROR
		Otherwise
AT\Gn	Accepted but ignored.	OK n=0 or 1
		ERROR
		Otherwise
AT\Kn	Accepted but ignored.	OK n=0 to 5
		ERROR
		Otherwise

50 Chapter 7 Special Features: Modem Emulation