Advantech UNO-2483G - Turn On;Off Termination Resistors (120 Ohm) for COM3;COM4 (SW1)

31 UNO-2483G/2473G User Manual
Appendix A System Settings and Pin Assignments
A.9 Turn On/Off Termination Resistors (120 ohm) for
COM3/COM4 (SW1)
Enable Termination Resistors
 COM3: Jumper (3-4) On
 COM4: Jumper (5-6) On
Disable Termination Resistors
 COM3: Jumper (3-4) Off
 COM4: Jumper (5-6) Off