Keyboard Lock Function(Jp4) - Aaeon PCM-4335 Manual

Keyboard lock function (JP4)
You can use a switch (or a lock) to disable the keyboard. In this
state, the PC will not respond to any input. This is useful if you
don't want anyone to change or stop a running program. Simply
connect the switch between Pins 1 and 2. The pin assignments
appear in the following table:
Keyboard lock function (JP4)
Pin
1
2
26 PCM-4335 User's Manual
1 2
(JP4)
Function
Keyboard lock
Ground
1 14
13 26
1 4
2 5
3 6
14 13
ST
P C
CLIENT
2 1