Jetway Computer ADE4COMCB - Manual (Page 4)

5. JP_COM_A：Select RS232/RS422/RS485
━ RS232：1-2 close
━ RS422：1-2 and 3-4 close together
━ RS485：3-4 close or all open
Driver Receiver
━ SLEW RATE CONTROL：5-6
Open：Maximum data rate
Close：Data rate is 250Kbps
6. JP_COM_B：Select RS232/RS422/RS485, please refer to JP_COM_A
7. JP_COM_C：Select RI#/+12V/+5V
6 5
2 1
3 4
6 5
2 1
3 4
6 5
2 1
3 4
6 5
2 1
3 4
6 5
2 1
3 4
1-2 Close = RS232
3-4 Close = +12V
5-6 Close = +5V