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

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.)

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C)

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Multi-Tech Systems MT5634SMI V.92, MT5634SMI V.34 manual Registers
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MT5634SMI V.34, MT5634SMI V.92 specifications

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