RFL 9660 RFL Electronics Inc.
April 24, 2007 13-26 (973) 334-3100
13.4 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 auto answer completely.
S1
1 ring 0–255 0 Counts the rings that have occurred.
S2
decimal 0–127 43 (+) Sets ASCII code for the escape sequence character.
128–255
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 character.
33–127
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.
S7
seconds 35-65*
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 0–65 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 1–254 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 length of time that the modem waits before
disconnecting when no data is sent or received. A value of
zero disables the timer. See also the \T command
S35
decimal 0–1 1 0 disables, 1 enables the V.25 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 selected. (See S48).
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