User manual

UNO-4672 User Manual 16

2.5.4 Terminal Resistor (JP9~JP16)

The onboard termination resistor (120 ohm) for COM3~COM10 can be

used for long distance transmission or device matching. (Default Open.)

Please also refer to Table 2.9 for the mapping table of Jumper and COM

port.

Table 2.8: Jumper setting of terminal resistor

JPx Description

Add termial resistor on Tx+/Tx- of RS-422 or Data+/Data-

of RS-485

Add termial resistor on Rx+/Rx- of RS-422

Table 2.9: Mapping table of Jumper/DIP for COM port

COM port Jumper for RS-232

and RS-422/485

selection

SW2 DIP switch

for Auto-flow

control

Jumper for

Terminal

Resistor

COM3 JP2 DIP1 JP10

COM4 JP3 DIP2 JP11

COM5 JP1 DIP3 JP9

COM6 JP4 DIP4 JP12

COM7 JP6 DIP5 JP14

COM8 JP7 DIP6 JP15

COM9 JP5 DIP7 JP13

COM10 JP8 DIP8 JP16