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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.
