si2493 Silicon Laboratories, si2493 Datasheet - Page 42

• Manufacturer Part Number: si2493
• Description: V.92 Isomodem With Global Daa
• Manufacturer: Silicon Laboratories

Si2493
5. S-Registers
The S command allows reading (Sn?) or writing (Sn = x) the S-registers. The S-registers store values for functions
that typically are rarely changed, such as timers or counters, and the ASCII values of control characters, such as
carriage return. Table 13 summarizes the S-register set.
42
S-Register
(Decimal)
10
12
14
0
1
2
3
4
5
6
7
8
9
Automatic answer—Number of rings the Si2493 must
detect before answering a call. 0 disables auto answer.
Ring counter.
ESC code character.
Carriage return character.
Linefeed character.
Backspace character.
Dial tone wait timer—Number of seconds the Si2493
waits before blind dialing. Only applicable if blind dial-
ing is enabled (X0, X1, X3).
Carrier wait timer—Number of seconds the Si2493
waits for carrier before timing out. This register also
sets the number of seconds the modem waits for ring-
back when originating a call before hanging up. This
register also sets the number of seconds the answer
tone will continue while using the AT
Dial pause timer for , and < dial command modifiers.
Carrier presence timer—Time after a loss of carrier
that a carrier must be detected before reactivating
DCD. S9 is referred to as “carrier loss debounce time.”
Carrier loss timer—Time the carrier must be lost before
the Si2493 disconnects. Setting 255 disables discon-
nect entirely. If S10 is less than S9, even a momentary
loss of carrier causes a disconnect.
Escape code guard timer—Minimum guard time
required before and after “+++” for the Si2493 to rec-
ognize a valid escape sequence.
Wait for dial tone delay value (in relation to the W dial
modifier). Starts when “W” is executed in the dial
string.
Function
Table 13. S-Register Description
*
Definition
Y2A command.
Rev. 1.3
(Decimal)
13 (CR)
Default
08 (BS)
10 (LF)
43 (+)
02
80
02
06
14
50
12
0
0
Range
0–255
0–255
0–255
0–255
0–255
0–255
0–255
0–255
0–255
1–255
1–255
1–255
0–255
0.02 second
0.1 second
0.1 second
seconds
seconds
seconds
seconds
Rings
Rings
ASCII
ASCII
ASCII
ASCII
Units