User`s guide

TECHNICAL REFERENCE

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 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 is Bell 103

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