82 CHAPTER 6: TECHNICAL REFERENCE
S18 0 Test timer for &T loopback
testing. Sets the time in
seconds of testing before the
modem automatically times
out and terminates the test.
When set to 0, the timer is
disabled. Valid range is
1-255.
S19 0 Sets duration, in minutes, for
inactivity timer. This timer
activates when there is no
data activity on the phone
line; at time-out the modem
hangs up. S19 = 0 disables
the timer.
S20 0 Reserved
S21 10 Sets 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 ASCII decimal code for
the XON character.
S23 19 Stores ASCII decimal code for
the XOFF character.
S24 0 Reserved
S25 20 Sets duration, in hundredths
of a second, of a true DTR
drop. Prevents modem from
interpreting random glitches
as DTR loss. (Most users will
use the default; this register
is useful for compatibility
with older systems and
operating software.)
S26 0 Reserved
S27 0 Bit-mapped register setup. To
set the register, see
instructions for S13. Refer to
Table 6-6.
S28 0 Eliminates the V.32 answer
tones for a faster connection.
Table6-3
Register Default Function
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