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
).