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MT3334HD8 User Guide
46 CommPlete Communications Server
Introduction
This chapter describes the MT3334HD8’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
or
when
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: 1
S0
defines the number of rings the modem waits before answering an incoming call. The default value is
one ring, which causes the modem to answer the call immediately after the first ring. The maximum
number of rings that can be configured is 255. Setting the value to zero disables auto answer.
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: 0–127
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)