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Chapter 4 - Commands
4.2 S-Registers
Certain Command Mode configurations are stored in memory registers
called, S-Registers. The S command is used to assign a value to, and to
read the current value of an S-Register.
To assign a value to an S-Register, enter the letter S, followed by the S-
Register number and an equals sign (=), and then a decimal response to
the message “ENTER THE NEW VALUE IN DECIMAL FORMAT”.
To read an S-Register value, enter the letter S followed by the S-Register
number and a question mark (?), then hit RETURN. To verify that the S-
Register value was entered correctly, enter for example, ATS8? and hit
RETURN. You should receive a response of the assigned value given to
that S-Register.
S0
Number of Rings Until Modem Answers
Unit: 1 ring
Range: 0-255
Default: 1
Description: Sets the number of rings before the modem answers.
S1
Rings Which Have Occurred
Unit: 1 ring
Range: 0-255
Default: 0
Description: Counts the number of rings that have occurred.
S2
Escape Code Character
Unit: ASCII Character
Range: 0-127
Default: 43 (+ sign)
Description: Defines the escape code character.
S3
Return Character
Unit: ASCII Character
Range: 0-127
Default: 13
Description: Defines the character recognized as Carriage Return
(RETURN) or “Enter”.