Filter
Top Products
4 AT Commands, S-Registers, and Result Codes
40
MultiModemZPX 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, 1–255 0 Sets the number of rings until the modem
answers. ATS0=0 disables autoanswer com-
pletely. 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 char-
acter. 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 the line feed character.
S5 decimal 0–32, 8 (^H) Sets the ASCII code for the backspace char-
33–127 acter. Values over 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.
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, 1–127 37 (%) Sets ASCII code for remote configuration
escape character. S9=0 disables remote
configuration.
S10 100 ms 20–255 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.
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 dis-
connects 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.
S36 decimal 0–7 7 Specifies the action to take in the event of a
negotiation failure when error control is se-
lected. See S48.
* These values may be different outside North America.