Jetway Computer JBC381F39 - Manual (Page 17)

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(7) JCOMP4 (6-pin): COM4 Header Pin9 Function Select
3-4 Closed : +12V
JCOMP4
1-2 Closed: RS232; 5-6 Closed : +5V
1
1 1
(6)COPEN1 (2-pin): Case Open Message Display Function Select
Pin 1-2 shorted: Case open display function enabled. Use needs to enter BIOS and
enable ‘Case Open Detect’ function. In this case if you case is removed, next time
when you restart your computer a message will be displayed onscreen to inform you
of this.