Introduction; S-Registers - Multitech MT5634HD16 User Manual

MT5634HD8/16 User Guide

Introduction

This chapter describes the MT5634HD8/16's S-registers , which are small regions of memory where
modem configuration information is stored. Whereas AT commands tell a modem what to do, S-registers
tell the modem how to do it. Each S-register has a name that consists of the letter S and a number (S0, S1,
S2, etc.), hence the term S-register . Use the S r ? command to read the value stored in an S-register, and the
S r = n command to change it.

S-Registers

S0 Number of Rings Until Modem Answers
Unit: 1 ring
Range: 0–255
Default: 0
S0 defines the number of rings the modem waits before answering an incoming call. The default value is
zero (0), which effectively disables the auto-answer function. When auto-answer is disabled, the modem
can only answer via the ATA command. Set the S0 register value to one (1) to causes the modem to answer
the call immediately after the first ring. The maximum number of rings that can be configured is 255.
S1 Ring Count
Unit: 1 ring
Range: 0–255
Default: 0
S1 counts the number of rings that have occurred. It is a "read" type of register and is seldom, if ever, used
in typical operation. Each time an incoming ring signal is detected, S1 increases its value by one, up to a
maximum of 255. If you set S1 to a value other than its default value of zero, or if the value is increasing
with rings, this new value remains stored in S1 for eight seconds after the last ring is counted, after which
the value reverts back to zero.
S2 Escape Code Character
Unit: Decimal
Range: 0–255
Default: 43 (+)
S2 defines the escape code character by its decimal ASCII code. The default character is the plus (+) sign
(decimal 43). S2 may be set for any ASCII character. Setting an S2 value greater than 127 results in no
escape character, and therefore no means of entering command mode from online mode without breaking
the online connection, unless you use the BREAK method.
Note: If you change the S2 value, you must make corresponding changes in your data communications
software.
S3 Return Character
Unit: Decimal
Range: 0–127
Default: 13 (^M)
34 CommPlete Communications Server