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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:
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
ATS0=3
and press Enter. The modem will now answer a call after three rings.
ATS
n
=
v
Register
Function
Range
Default
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
0-255
0 rings
S1
Counts and logs the number of rings
0-255
0 rings
S2
Designates the ASCII character used to
indicate an escape character (refer to an
ASCII character conversion chart)
0-127
ASCII 43
S3
Designates the ASCII character used
for carriage returns (refer to an ASCII
character conversion chart)
0-127
ASCII 13
S4
Designates the ASCII character used
for line feeds (refer to an ASCII
character conversion chart)
0-127
ASCII 1
S5
Designates the ASCII character used
for backspaces
0-127
ASCII 8
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
2-255
6 seconds
S7
Carrier wait time
1-255
60 seconds
S8
Pause in dialing time (comma in dialing
string)
0-255
2 seconds
S9
Carrier detect validation time (1/10
second)
1-255
6
S10
Delay time between lost carrier and
1-255
7
