USRobotics V.34 user manual Analog Loopback

COURIER HIGH SPEED MODEMS

Register	Default	Function
S16	0	Bit-mapped test register. To set the
		register, see the instructions for S13. For
		information on testing, see Appendix H.

Bit	Value Result
0	1	Analog Loopback
1	2	Dial test
2	4	Test pattern
3	8	Remote Digital Loopback
4	16	Reserved
5	32	Reserved
6	64	Reserved

S17	0	Reserved.
S18	0	Test timer for software-initiated loopback
		testing (&Tn), disabled when S18 is set to
		0. See Appendix H. Used to set the
		duration of testing, in seconds, before the
		modem automatically times out and
		terminates the test.
S19	0	Sets the duration, in minutes, for the
		Inactivity Timer. The timer activates
		when there is no data activity on the
		phone line and at the timeout the modem
		hangs up. S19=0 disables the timer.
S20	0	Reserved.
S21	10	Sets, in 10-millisecond units, the length of
		Breaks sent from the modem to the
		computer or terminal. Applies to ARQ
		mode only.
S22	17	Stores the ASCII decimal code for the
		XON character.
S23	19	Stores the ASCII decimal code for the
		XOFF character.

B-20 Summaries and Tables