PowerBook 3400: How Do I Use S-Registers?

I have read a document posted on the Internet titled "AT Command Set US 33.6" or "PB 3400 AT Commands". The article discusses S-Registers but does not tell me how they are used. Do they belong in the modem initialization string? Is there a particular format that an S-Register command must subscribe to?
The S command is used to assign values to various registers in a modem's memory. S-Registers are used to customize modem behavior, and most S-Registers are employed to adjust certain aspects of timing. An S-Register command should be entered as part of the modem initialization string, and it should conform to the following format:

Sn=r

The letter "S" establishes the command, the letter "n" represents the number of the register, and the letter "r" represents the assigned value.

For more information regarding AT commands and S-Registers see the TIL articles listed below.

Article 17931: Modem AT Command Set: Description Part 1/2
Article 17945: Modem AT Command Set: Description Part 2/2
Article 17946: Modem AT Command Set: S Registers


This article was published in the 29 May 1997 "Information Alley".
Published Date: Feb 18, 2012