SI2457-C-FSR Silicon Laboratories Inc, SI2457-C-FSR Datasheet - Page 39

• Manufacturer Part Number: SI2457-C-FSR
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-C-FSR

• Lead Free Status / RoHS Status: Compliant

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 15 summarizes the S-register set.
S-Register
(Decimal)
10
12
14
0
1
2
3
4
5
6
7
8
9
Automatic answer—Number of rings the Si2457/34/15/
04 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 Si2457/
34/15/04 waits before blind dialing. Only applicable if
blind dialing is enabled (X0, X1, X3).
Carrier wait timer—Number of seconds the Si2457/34/
15/04 waits for carrier before timing out. This register
also sets the number of seconds the modem waits for
ringback when originating a call before hanging up.
This register also sets the number of seconds the
answer tone will continue while using the AT
command.
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 Si2457/34/15/04 disconnects. Setting 255
disables disconnect 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 Si2457/34/15/
04 to recognize 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 15. S-Register Description
Definition
Rev. 1.1
*
Y2A
(Decimal)
13 (CR)
Default
08 (BS)
10 (LF)
43 (+)
02
80
02
06
14
50
12
0
0
Si2457/34/15/04
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
ASCII
ASCII
ASCII
Rings
Rings
ASCII
Units
39