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Register Default Function
S25 5 Sets the duration (in hundredths of a second) that
DTR must be dropped in order to be interpreted as a
DTR loss. Allows the modem to differentiate
between a random glitch and a true DTR loss.
In most cases, the default value can be used. The S25
register is useful for setting compatibility with older
systems running under older operating software.
S26 0 Reserved.
S27 0 Bit-mapped register setup. To set the register see the
instructions for S13.
Bit
Value Result
0 1 Enables ITU-T V.21 modulation at
300 bps for overseas calls; in V.21
mode, the modem answers both
overseas and domestic (U.S. And
Canada) calls, but only originates
V.21 calls. (Default Bell 103)
1 2 Enables un-encoded (non-trellis
coded) modulation in V.32 mode.
2 4 Disables V.32 modulation.
3 8 Disables 2100 Hz answer tone to
allow two V.42 modems to
connect more quickly.
4 16 Enables V.23 fallback mode.
5 32 Disables V.32bis mode.
6 64 Reserved.
7 128 Software compatibility code. This
setting disables the codes and
displays the 9600 code instead.
The actual rate of the call can be
viewed on the ATI6 screen. Used
for unusual software
incompatibilities. Some software
may not accept 7200, 12000 and
14400 bps or greater result codes.
S28 0 Eliminates the V.32 answer tones for a faster
connection.
8 Default item, all times are in tenths of a second.
255 Disables all connections except V.32 at 9600 bps.
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S-Registers