Technical Reference
66
Register Default
Function
S22
17
Stores the ASCII decimal code for the Xon character
S23
19
Stores the ASCII decimal code for the Xoff character
S24
0
Reserved
S25
20
Sets the duration, in hundredths of a second, that DTR must be dropped so that the modem
does not interpret a random glitch as a DTR loss
Most users will want to use the default
This 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 instructions for S13
Bit
Value
Result
0
1
Enables ITU-T V.21 modulation at 300 bps for UK calls
1
2
Enables unencoded (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 faster
4
16
Enables V.23 fallback mode
5
32
Disables V.32
bis
mode
Содержание U.S. Robotics 56K Voice
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