User`s guide

S19 0 Sets the duration, in minutes, for the inactivity timer.

The timer activates when there is nodata activity on the phone line; at

time-out the modem hangs up. S19 = 0 disables the timer.

S20 0 Reserved.

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.