3Com Courier, Reference

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A complete list of S-Registers A-7
5 32 Set Backspace key to delete.
6 64 Some earlier 2400 bps MNP Courier
V.Everything modems, not made by
3Com or Microcom, were not fully
compatible with the MNP protocol. If
you have difficulty making a successful
2400 bps MNP connection with a
remote MNP modem, it may be because
of this incompatibility. Set S15 to 64 and
try again to make the connection.
7 128 Custom applications only.
The default 1.5K byte non-ARQ buffer
allows data transfer with X- and
Y-modem type File Transfer Protocols
without using flow control.
The 128-byte option allows remote users
with slower modems to stop your
transmitted data from scrolling off their
screens. When remote users send your
computer an XOFF (<Ctrl-S>) and you
stop transmitting, the data in transit
doesn’t exceed the size of their screen.
S16 0 Bit-mapped register. ( See the beginning of this appendix for
information about setting bit-mapped registers). For testing, see
Chapter 15, Testing.
Bit Value Result
1 2 Dial Test
2 4 Test pattern.
3 8 Remote digital loopback.
S18 0 Test timer for software-initiated loopback testing (&Tn); disabled when
S18 is set to 0. Used to set the duration of testing, in seconds, before
the Courier V.Everything 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 R232 interface, and at
the timeout the Courier V.Everything mode
hangs up. S19=0
disables the timer.
S21 10 Sets, in 10-millisecond units, the length of breaks sent from the
Courier V.Everything mode
to the computer or terminal. Applies to
ARQ mode only.
S22 17 Stores the ASCII code for the XON character.
S23 19 Stores the ASCII code for the XOFF character.
Register Default Function