Multi-Tech Systems MT3334SMI manual Registers, Register Unit Range Default Description

ModemModule Developer’s Guide

S-Registers

Certain modem values, or parameters, are stored in memory locations called S-registers. Use the S command to read or to alter the contents of S-registers (see previous section).

Register	Unit	Range	Default	Description
S0	1 ring	0, 1–255	1	Sets the number of rings until the modem answers. ATS0=0
				disables autoanswer completely.
S1	1 ring	0–255	0	Counts the rings that have occurred.
S2	decimal 0–127		43 (+)	Sets ASCII code for the escape sequence character.
		128–255		Values greater than 127 disable escape.
S3	decimal 0–127		13 (^M)	Sets the ASCII code for the carriage return character.
S4	decimal 0–127		10 (^J)	Sets the ASCII code for the line feed character.
S5	decimal 0–32		8 (^H)	Sets the ASCII code for the backspace character.
		33–127		Values greater than 32 disable backspace.
S6	seconds 2–65*		2*	Sets the time the modem waits after it goes off-hook before it
				begins to dial the telephone number.
S7	seconds 1–255*		50*	Sets the time the modem waits for a carrier signal before aborting
				a call. Also sets the wait for silence time for the @ dial modifier.
S8	seconds 0–65		2	Sets the length of a pause caused by a comma character in a
				dialing command.
S9	decimal 0, 1–127		37 (%)	Sets ASCII code for remote configuration escape character. S9=0
				disables remote configuration.
S10	100 ms	1–254	20	Sets how long a carrier signal must be lost before the modem
				disconnects.
S11	1 ms	50–150*	95*	Sets spacing and duration of dialing tones.
S28	decimal 0, 1–255		1	0 disables, 1–255 enables V.34 modulation.
S30	1 minute0, 1–255		0	Sets the length of time that the modem waits before disconnecting
				when no data is sent or received. A value of zero disables the
				timer. See also the \T command
S35	decimal 0–1		0	0 disables, 1 enables the V.25 data calling tone, which allows
				remote data/fax/voice discrimination.
S36	decimal 0–7		7	Specifies the action to take in the event of a negotiation failure
				when error control is selected. (See S48.)
S37	decimal 0–19		0	Sets the maximum V.34 “upstream” speed at which the modem
				attempts to connect.
				0	= maximum modem speed
				1	= reserved
				2 = 1200/75 bps
				3	= 300 bps
				4	= reserved
				5	= 1200 bps
				6	= 2400 bps
				7	= 4800 bps
				8	= 7200 bps
				9	= 9600 bps
				10	= 12000 bps
				11 = 14400 bps
				12	= 16800 bps
				13	= 19200 bps
				14	= 21600 bps
				15	= 24000 bps
				16	= 26400 bps
				17	= 28800 bps
				18	= 31200 bps
				19	= 33600 bps

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