Bit Value | Western Telematic Data/FaxModem manual

Register	Default	Function

S14	0	Reserved
S15	0	Bit-mapped register setup. To set the register, see
		instructions for S13.
			Bit	Value	Result
		0		1	Disable ARQ/MNP for V.22.
		1		2	Disable ARQ/MNP for .22bis.
		2		4	Disable ARQ/MNP V.32 / V.32bis
					/ V.32terbo.
		3		8	Disable MNP handshake.
		4		16	Disable MNP level 4.
		5		32	Disable MNP level 3.
		6		64	MNP incompatibility
		7		128	Disable V.42 operation.
S16	0	Bit-mapped register setup. To set the register, see
		instructions for S13.
			Bit	Value	Result
		0		—	Reserved.
		1		2	Touch tone dialing test.
		2-7		—	Reserved.
S17	0	Reserved.
S18	0	Test timer for &Tn loopback testing. Sets the length
		of time (in seconds) the modem will wait before
		automatically timing out and terminating the test.
		When set to 0, the timer is disabled.
		Valid range is 1 - 255
S19	0	Sets the duration (in minutes) for the Inactivity Timer.
		The timer activates when there is no data activity on
		the phone line. At time out, the modem hangs up.
		S19 = 0 disables the timer.
S20	0	Reserved.
S21	10	Sets the length (in 10 millisecond units) of Breaks
		sent from the modem to the computer. Applies to
		MNP or V.42 mode only.
S22	17	Stores the ASCII decimal code for the XON
		character.
S23	19	Stores the ASCII decimal code for the XOFF
		character.
S24	0	Reserved.

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