Chapter 4 - AT Commands, S-Registers and Result Codes

MT4X56USB 49

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).

S0 1 ring 0, 1–255 1 Sets the number of rings until the modem answers. ATS0=0

disables autoanswer 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 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 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 5 0–150* 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 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 selected. (See S48.)

S37 decimal 0–19 0 Sets the maximum V.34 “upstream” speed at which the

modem attempts to connect.

0 = maximum modem speed

1 = reserved

2 = 1200/75 bps

3 = 300 bps

4 = reserved

5 = 1200 bps

6 = 2400 bps

7 = 4800 bps

8 = 7200 bps

9 = 9600 bps

10 = 12000 bps

11 = 14400 bps

12 = 16800 bps

13 = 19200 bps

14 = 21600 bps

15 = 24000 bps

16 = 26400 bps

17 = 28800 bps

18 = 31200 bps

19 = 33600 bps

* These values may be different outside North America.

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