Chapter 1 – AT Commands, S-Registers, and Result Codes
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
S2
S3
S4
S5
1 ring
decimal
decimal
decimal
decimal
0–255
0–127
0–127
0–127
0–32
0
43 (+)
13 (^M)
10 (^J)
8 (^H)
Counts the rings that have occurred.
Sets ASCII code for the escape sequence character.
Sets the ASCII code for the carriage return character.
Sets the ASCII code for the line feed character.
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
S24
S28
1 ms
secs
decimal
50–150*
0, 5-65
0, 1–255
95*
0
1
Sets spacing and duration of dialing tones.
Sets the timer to control sleep mode. Default of 0 = Off.
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 .)
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
38
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