Jetway Computer NF9C - Manual (Page 18)

13
(11) JP16 (6-pin): COM4 Pin9 Function Select
3-4 closed : +12V
JP16
1-2 closed: RS232
1
5-6 closed : +5V
(12) JP17 (6-pin): COM4 RS232/485/422 Function Select
3-4 closed : RS485
JP17
1
1-2 closed: RS232
1 1
5-6 closed : RS422