3 AT Commands, Result Codes, and S-Registers

S-Registers

S-registers generally affect how the AT commands perform. You can read or alter the contents of an S-register by using the S command (see AT Commands).

Register

Unit

Range

Default

Description

S0

rings

0, 1–255

0

Sets the number of rings before the

 

 

 

 

modem answers. ATS0=0 disables

 

 

 

 

auto-answer completely.

S1

rings

0–255

0

Counts the number of rings that have

 

 

 

 

occurred.

S2

decimal

0–127

43 (+)

Sets ASCII code for the escape

 

 

128–255

 

character. Values greater than 127

 

 

 

 

disable the escape sequence.

S3

decimal

0–127

13 (^M)

Sets ASCII code for the carriage

 

 

 

 

return character.

S4

decimal

0–127

10 (^J)

Sets ASCII code for the line feed

 

 

 

 

character.

S5

decimal

0–32

8 (^H)

Sets ASCII code for the backspace

 

 

33–127

 

character. Values greater than 32

 

 

 

 

disable the backspace character.

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 com-

 

 

 

 

mand.

S10

100 ms

1–254

20

Sets how long a carrier signal must be

 

 

 

 

lost before the modem disconnects.

Note: These values may be different outside North America.

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Multi-Tech Systems MT5634ZPX-PCI owner manual Registers