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COURIER HIGH SPEED MODEMS
B-20 Summaries and Tables
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.