Jetway Computer ADMPEOX4CA - Manual (Page 29)

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4. JCOM4: RS232, RS485, RS422 Function select
5. JCOMP3: RS232 Power Function Select
3-4 closed : RS485
JCOM4
1
1-2 closed: RS232
1
1
5-6 closed : RS422
3-4 closed : +12V
JCOMP3
1
1-2 closed: RS232
1
1
5-6 closed : +5V