Jetway Computer JBC381F39 - Manual (Page 16)

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(5) JCOMP2 (6-pin): COM2 Header Pin9 Function Select
3-4 Closed : +12V
JCOMP2
1-2 Closed: RS232; 5-6 Closed : +5V
1
1 1
(6) JCOMP3 (6-pin): COM3 Header Pin9 Function Select
3-4 Closed : +12V
JCOMP3
1-2 Closed: RS232; 5-6 Closed : +5V
1
1 1