Multi Tech Equipment ISIHI-2S Benutzerhandbuch

This chapter describes the ISIHI-2S’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

 

command to read the value stored in an S-register and the S

 command to

change it.

Number of Rings Until Modem Answers
Unit: 1 ring
Range: 0–255
Default: 0

 

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.

Ring Count
Unit: 1 ring
Range: 0–255
Default: 0

 

counts the number of rings that have occurred. It is a 

read 

type of register and is

seldom 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.

Escape Code Character
Unit: Decimal
Range: 0–255
Default: 43 (+)

 

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.