Silicon Laboratories SI2494/39, SI2493/57/34/15/04 manual All spaces 0s

AN93

Table 45. S-Register Descriptions (Continued)

Definition

S Register	Function	Default	Range	Units
(Decimal)		(Decimal)
10	Carrier loss timer—The time a remote modem carrier	14	1–255	0.1 second
	must be lost before the ISOmodem disconnects. Set-
	ting this timer to 255 disables the timer, and the
	modem does not time out and disconnect. If S10 is
	less than S9, even a momentary loss of carrier causes
	a disconnect. Use for V.22bis and lower data rates.
12	Escape code guard timer—Minimum guard time	50	10–255	0.02 second
	before and after +++ to recognize a valid escape
	sequence.
14	Wait for dial tone delay timer. This timer starts when	12	0–255	seconds
	the W command is executed in the dial string.
24	Sleep inactivity time—This is the time the modem	0	0–255	seconds
	operates in normal power mode with no activity on the
	UART, parallel port, SPI port, or telephone line before
	entering the low-power sleep mode and waking on
	ring. The modem remains in the normal power mode,
	regardless of activity, if the timer is set to 0.
30	Disconnect activity timer—Sets the length of time that	0	0–255	minutes
	the modem stays online before disconnecting with no
	activity on the UART, parallel port, SPI port, or tele-
	phone line (ring, hookswitch flash, or Caller ID). This
	feature is disabled if set to 0.
38	Hang up delay time—Maximum delay between receipt	20	0–255	seconds
	of the ATH0 command and hang up. If time out occurs
	before all data can be sent, the NO CARRIER (3)
	result code is sent. An OK response is sent if all data
	are transmitted prior to time out. This register applies
	to V.42 mode only. S38=255 disables time out, and the
	modem only disconnects if data are successfully sent
	or carrier lost.
40	Data Pattern - Data pattern generated during &T4 and	0	0–2	–
	&T5 transmit tests.
	0 – All spaces (0s)
	1 – All marks (1s)
	2 – Random data

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