Black Box MD403A user manual Registers, Unit Range Default Description

CHAPTER 4: AT Commands, S-Registers, and Result Codes

4.2 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 character. Values
		128–255		greater than 127 disable ESC.
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
		33–127		backspace character. 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.

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