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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.