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T
ECHNICAL
R
EFERENCE
8-26
Register Default
Function
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 the duration, in minutes, for the inactivity timer. The 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 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
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