Multi-Tech Systems MT2834ZDX manual Registers, Register Unit Range Default Description

Chapter 3 – AT Commands, S-Registers, and Results Codes

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

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 code character.
S3	decimal	0–127	13 (^M)	Sets ASCII code for the RETURN character.
S4	decimal	0–127	10 (^J)	Sets ASCII code for the LINE FEED character.
S5	decimal	0–127	8 (^H)	Sets ASCII code for the BACKSPACE character.
S6	1 sec.	2–255	2	Sets the time the modem will wait for a dial tone before aborting a
				call.
S7	1 sec.	1–255	45	Sets the time the modem.
S8	1 sec.	0–255	2	Sets the length of a pause caused by a comma character in a
				dialing command.
S9	100 ms	1–255	6	Sets delay between when the modem detects a valid carrier
				signal and when it turns on its CD circuit.
S10	100 ms	1–254	7	Sets how long a carrier signal must be lost before the modem
				disconnects. S10=255 causes the modem to not disconnect with
				loss of carrier.
S11	1 ms	1–255	70	Sets spacing and duration of dialing tones. Recommended
				minimum is 50 ms.
S13	decimal	0, 1–127	37 (%)	Sets ASCII code for remote configuration escape character.
				S13=0 disables remote configuration.
S17	10 ms	1–255	25	Sets the length of the break time (space) sent to the local PC
				when the modem receives a remote break.
S24	50 ms	0–255	20	Sets the time the DSR, CTS, and CD signals drop before going
				high again. Used for some PBX and CBX phone systems.
S25	100 ms	0, 1–255	0	Sets the time the DTR signal must be dropped before the modem
				disconnects. The 0 default equals 50 ms.
S30	1 min.	0, 1–255	0	Sets how long the modem waits after the last character is
				received or transmitted before it disconnects. The 0 default
				disables the timer.
S32	100 ms	0–255	20	Sets the time the modem will wait for a RETURN to be entered
				during escape sequence execution.
S34	1 char	0–60	10	Sets the number of command characters allowed after +++AT.
S36	1 sec.	0, 1-255	5	Sets the time between DTR inactive and modem offhook. S36=0
				disables DTR busy-out.
S37	1 sec.	0-255	5	Sets the time between DTR active and modem on-hook.
S43	decimal	28, 26,	0	Sets fixed V.34 connect speed. 28 = 28800 bps; 26 = 26400 bps;
		24, 21,		48 = 4800 bps. 0 default disables this feature.
		19, 16,
		14, 12,
		96, or 48
S48	decimal	33, 31,	0	Sets maximum V.34 connect speed. 33 = 33600 bps; 31 = 31200
		28, 26,		bps;…48 = 4800 bps. 0 default disables feature (same as
		24, 21,		S48=33).
		19, 16,
		14, 12,
		96, or 48

Multi-Tech Systems, Inc. MT2834ZDX User's Guide 18