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Chapter 4 - AT Commands, S-Registers, Result Codes
36
MultiModemDID User 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 0–255 1 Sets the number of rings until the modem
answers. ATS0=0 disables autoanswer
completely. Range varies by country. Set
S0=2 for Caller ID.
S1
1 ring 0–255 0 Counts the rings that have occurred.
S2
decimal 0–255 43 (+) Sets ASCII code for the escape sequence
character. 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 line feed character.
S5
decimal 0–127 8 (^H) Sets the ASCII code for the backspace
character. Values over 32 disable it.
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 2–65 2 Sets the length of a pause caused by a
comma character in a dialing command.
S9
decimal 0–127 37 (%) Sets ASCII code for remote configuration
escape character. S9=0 disables remote
configuration.
S10
100 ms 1–255 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.
S18
50 ms 0–255 20 Sets the time the CD signal drops before
going high again. Used for some PBX and
CBX phone systems. See &C2 command.
S28
decimal 0, 1–255 1 0 disables, 1–255 enables V.34 modulation.
S30
1 minute 0, 1–255 0 Sets the time the modem waits before it
disconnects 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.