User`s guide

62 56K Message Modem
Register Default Function
S21 10 Sets the length, in 10-millisecond units, of breaks
sent from the modem to the computer; applies to
MNP or V.42 mode only.
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 doesn’t
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. 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 modulation.
5 32 Disables V.32bis mode.
6 64 Disable V.42 selective reject.