Lanner electronics AP-687VF Manual page 18

JUMPER SETTING AND CONNECTORS
JP3, JP4, JP5, JP6, JP7 : Select Serial Port#2 Type
JP3 JP4
1-2 1-2
3-4 2-3
5-6 2-3
RS-232
JP4 JP6
JP5 JP7
JP3 1 1 1 1
1 2
3 4
5 6
3 3 3 3
RS-422
RS-485
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JP5
1-2
2-3
2-3
JP4 JP6
JP5 JP7
JP3
1 1 1 1
1 2
3 4
5 6
3 3 3 3
JP3 JP6
JP4
JP5
JP7
AP-687VF/F 12
JP6 JP7
1-2 1-2
2-3 2-3
2-3 2-3
Default :
JP4 JP6
JP5
JP3 1 1 1 1
1 2
3 4
5 6
3 3
Serial Port#2 Type
RS-232 ( Default )
RS-422
RS-485
JP7
3 3