53
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
