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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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