SI3015-F-FS View Datasheet(PDF) - Silicon Laboratories
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Description
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SI3015-F-FS Datasheet PDF : 68 Pages
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Si2403
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.
Table 13. S-Register Descriptions
Definition
S-Register
(Decimal)
Function
0
Automatic answer—Number of rings the Si2403 must
detect before answering a call. 0 disables auto answer.
1
Ring counter.
2
ESC code character.
3
Carriage return character.
4
Linefeed character.
5
Backspace character.
6
Dial tone wait timer—Number of seconds the Si2403
waits before blind dialing. Only applicable if blind dial-
ing is enabled (X0, X1, X3).
7
Carrier wait timer—Number of seconds the Si2403
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 Y2A command.
8
Dial pause timer for , and < dial command modifiers.
9
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.â€
10
Carrier loss timer—Time the carrier must be lost
before the Si2403 disconnects. Setting 255 disables
disconnect entirely. If S10 is less than S9, even a
momentary loss of carrier causes a disconnect.
12
Escape code guard timer—Minimum guard time
required before and after “+++†for the Si2403 to rec-
ognize a valid escape sequence.
14
Wait for dial tone delay value (in relation to the W dial
modifier). Starts when “W†is executed in the dial
string.
24
Sleep Inactivity Time—Sets the time that the modem
operates in normal power mode with no activity on the
serial port, parallel port, or telephone line before enter-
ing low-power sleep mode. This feature is disabled if
the timer is set to 0.
Default
(Decimal)
0
0
43 (+)
13 (CR)
10 (LF)
08 (BS)
02
80
02
06
14
50
12
0
Range
0–255
0–255
0–255
0–255
0–255
0–255
0–255
Units
Rings
Rings
ASCII
ASCII
ASCII
ASCII
seconds
0–255
seconds
0–255
1–255
seconds
0.1 seconds
1–255 0.1 seconds
1–255 0.02 seconds
0–255
seconds
0–255
seconds
Rev. 1.2
33
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