Jetway Computer ADMPEOX4CA - Manual (Page 28)

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2. TX-RXCOM4: RS-422 or RS485
3.
JCOMP4: RS232 Power Function Select
RS422/485 Header
TX-RXCOM4
Pin 1
TXD
N
RXDN
TXD
P
2
RXDP
TX-RXCOM4
3-4 closed : +12V
JCOMP4
1
1-2 closed: RS232
1
1
5-6 closed : +5V