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.)

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Western Telematic MT5634 manual Registers, Register Unit Range Default Description