USRobotics V.34 - Manual (Page 115)

COURIER HIGH SPEED MODEMS
Summaries and Tables B-21
Register Default Function
S24 150 Sets the duration, in 20-millisecond units,
between pulsed DSR signals when the
modem is set to &S2 or &S3. The default
is 3 seconds.
S25 5 Sets DTR recognition time in 1/100th of a
second units.
S26 1 Sets the duration, in 1/100th of a second
units, of the delay between RTS and the
modem's CTS response in synchronous
mode.
S27 0 Bit-mapped register. To set the register,
see the instructions for S13.
Bit ValueResult
0 1 Enable ITU-T V.21 modulation
at 300 bps for overseas calls. In
V.21 mode, the modem an-
swers both Bell 103 and V.21
calls, but only originates V.21
calls.
1 2 Enable unencoded (non-trellis-
coded) modulation in V.32
mode; this option is part of the
ITU-T V.32 recommendation,
but is rarely used.
2 4 Disable V.32 modulation; used
for testing HST modulation in
Dual Standard modems.
3 8 Disable 2100 Hz answer tone to
allow two V.42 modems to
connect more quickly.
4 16 See next page.
5 32 See next page.
6 64 Reserved.