3Com Courier Reference page 150

A-8 A A: S-R
PPENDIX EGISTERS
Register Default Function
S24 150 Sets the duration, in 20-millisecond units, between pulsed DSR signals
when the Courier V.Everything modem is set to &S2 or &S3. The
default is 3 seconds.
S25 5 Sets DTR recognition time in 10-millisecond units.
S26 1 Sets duration, in 10-millisecond units, of the delay between RTS and
the CTS in synchronous mode.
S27 0 Bit-mapped register. ( See the beginning of this appendix for
information about setting bit-mapped registers).
Bit
0
1
2
3
4
5
6
7
Error control handshaking options: Select the total value of bits 4
and 5
Bit 4
0
16
0
Value Result
1 Enable ITU-T V.21 modulation at 300
bps for overseas calls. In V.21 mode, the
Courier V.Everything modem answers
both Bell 103 and V.21 calls, but only
originates V.21 calls.
2 Enable unencoded (non- trelliscoded)
modulation in V.32 mode; this option is
part of the ITU-T V.32 recommendation,
but is rarely used.
4 Disable V.32 modulation; used for
testing HST modulation.
8 Disable 2100 Hz answer tone to allow
two V.42 devices to connect more
quickly.
16 See next page.
32 See next page.
48 Disable V.42 Detect Phase
128 Unusual software incompatibility. Some
software may not accept some result
codes. This setting disables the codes
and displays the 9600 code instead. The
call's actual rate can be viewed on the
ATI6 screen.
Bit 5 Result
0 Complete handshaking sequence: V.42
Detection, LAPM error control, MNP.
0 Disable MNP.
32 Disable V.42 Detection and LAPM.