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USRobotics V.34 User Manual

Page 115

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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.