3Com 56K Command Reference Manual page 144

A-8 A A: S-R
PPENDIX EGISTERS
Register Default Function
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 Business Modem hangs
up. S19=0 disables the timer.
S21 10 Sets, in 10-millisecond units, the length of breaks sent from
the Business Modem 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.
S24 150 Sets the duration, in 20-millisecond units, between pulsed
DSR signals when the Business Modem is set to &S2 or &S3.
The default is 3 seconds.
S25 5 Sets DTR recognition time in 10-millisecond units.
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
Value Result
1 Enable ITU-T V.21 modulation at
300 bps for overseas calls. In V.21
mode, the Business 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.