V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
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5. S-Registers
Certain modem values, or parameters, are stored in memory locations called S-Registers. Use the S command
to read or alter the contents of the S-Registers.
S-Reg
Unit
Range
Default
Description
S0
1 ring
0, 1–255
country
Number of Rings to Auto-Answer: Sets the number of rings
dependent
required before the modem automatically answers a call.
ATS0=0 disables autoanswer completely.
S1
1 ring
0–255
0
Ring Counter: Counts the rings that have occurred.
S2
decimal
0–127
43(+)
Escape Character: Sets ASCII code for the escape sequence
128–255 character. Values greater than 127 disable escape.
S3
decimal
0–127
13(^M)
Carriage Return Character: Sets the ASCII code for the
carriage return character.
S4
decimal
0–127
10(^J)
Line Feed Character: Sets the ASCII code for the line feed
character.
S5
decimal
0–32
8(^H)
Backspace Character: Sets the ASCII code for the
backspace 33–127 character. Values greater than 32 disable
backspace.
S6
seconds
2–255
country
Wait Time Before Blind Dialing or for Dial Tone: Sets the
dependent
time the modem waits after it goes off-hook before it begins
to dial the phone number.
S7
seconds
1–255
country
Wait Time for Carrier, Silence, or Dial Tone: Sets the time
dependent
the modem waits for a carrier signal before aborting a call.
Sets the wait for silence time for the @ dial modifier. Sets
the time the modem waits for a dial tone after
encountering W in the dial string.
S8
seconds
0–255
2
Pause Time for Dial Delay: Sets the length of the pause
caused by a comma character in a dialing command.
S9
100 ms
1–255
6
Carrier Detect Response Time: Sets the time, in tenths of a
second that the carrier must be present before the modem
considers it valid.
S10
100 ms
1–255
14
Lost Carrier to Hang Up Delay: Sets how long a carrier
signal must be lost before the modem disconnects.
S11
1 ms
50–255
country
DTMF Tone Duration: Sets spacing and duration of dialing
dependent
tones.
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