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Modem S-Registers: Mini PCI Type 3B Data Fax Modem by 3Com User's Guide
 Modem S-Registers
The AT command settings are stored in the S-Registers. S-Register values can be changed either by entering an AT command or by entering the
new value of the S-Register, preceded by AT, like this:
 
ATSn=v
where n is the number of the S-Register you want to change and v is the new value of that S-Register.
Suppose you want to change from manual answer (when you answer the call) to auto-answer (where the modem picks up the call after a certain
number of rings), and have the call answered after three rings. Follow these steps:
1. Check the table below to find the S-Register that controls answering.
2. Enter your communications software.
3. Enter Terminal mode.
4. Type
and press Enter. The modem will now answer a call after three rings.
ATS0=3
Register
Function
 
 
S0
Number of rings before the modem
auto-answers a call. If set to 0, auto-
answer is disabled and manual answer
is in effect
 
 
S1
Counts and logs the number of rings
 
 
S2
Designates the ASCII character used to
indicate an escape character (refer to an
ASCII character conversion chart)
 
 
S3
Designates the ASCII character used
for carriage returns (refer to an ASCII
character conversion chart)
 
 
S4
Designates the ASCII character used
for line feeds (refer to an ASCII
character conversion chart)
 
 
S5
Designates the ASCII character used
for backspaces
 
 
S6
Dial tone wait time; if AT command X is
set to X2 or X4, the modem ignores this
register and dials as soon as it detects a
dial tone
 
 
S7
Carrier wait time
 
 
S8
Pause in dialing time (comma in dialing
string)
 
 
S9
Carrier detect validation time (1/10
second)
 
 
S10
Delay time between lost carrier and
Range
Default
 
 
0-255
0 rings
 
 
0-255
0 rings
 
 
0-127
ASCII 43
 
 
0-127
ASCII 13
 
 
0-127
ASCII 1
 
 
0-127
ASCII 8
 
 
2-255
6 seconds 
 
 
1-255
60 seconds
 
 
0-255
2 seconds
 
 
1-255
6
 
 
1-255
7