Multi-Tech Systems MT2834BL Series, MT2834BA Series manual $SBn

		Appendix C - AT Command Summary
$SBn	n = speed	$SB300 selects 300 bps at serial port.
		$SB1200 selects 1200 bps at serial port.
		$SB2400 selects 2400 bps at serial port.
		$SB4800 selects 4800 bps at serial port.
		$SB9600 selects 9600 bps at serial port.
		$SB19200 selects 19,200 bps at serial port.
		$SB38400 selects 38,400 bps at serial port.
		* $SB57600 selects 57600 bps at serial port.
		$SB115200 selects 115200 bps at serial port.
&SFn	n = 0 or 1	* &SF0 selects DSR follows CD.
		&SF1 selects DSR independent.
&Sn	n = 0, 1 or 2	&S0 forces Data Set Ready On.
		* &S1 lets Data Set Ready act normally.
		&S2 Data Set Ready drop is regulated by S24 on
		disconnect.
$SPn	n = 0 or 1	* $SP0 disables UUCP Spoofing
		$SP1 enables UUCP Spoofing
T		Modem will tone-dial numbers following the T.
&Tn	n = 4 or 5	&T4 means Enable Response to Request for
		Remote Digital Loopback.
		* &T5 means Disable Response to Request for
		Remote Digital Loopback.
#Tn	n = 0 or 1	#T0 turns off Trellis Coded Modulation
		* #T1 turns on Trellis Coded Modulation
Un	n = 0, 1, 2, or 3	U0 places modem in Analog Loop Originate Mode.
		U1 places modem in Analog Loop Answer Mode.
		U2 places modem in Remote Digital Loopback test
		mode.
		U3 places modem in Local Digital Loopback test
		mode.
$VDn	n= 0 or 1	* $VD0 disables Voice/Data Dialing
		$VD1 enables Voice/Data Dialing
Vn	n = 0 or 1	V0 means Result Codes sent as digits (terse
		response).
		* V1 means Result Codes sent as words (verbose
		response).
W		Wait for new dial-tone.
&Wn	n = 0 or 1	&W0 causes modem to store its current parameters
		in non-volatile RAM, and modem will load these for
		future sessions instead of reading factory ROM
		defaults, unless &F command used.
		* &W1 causes modem to not store parameters.

*Factory Default

Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 103