Terminal Resistor (Sw6,Sw8); Table 2.6:Jumper Setting Of Terminal Resistor - Advantech UNO-4683 User Manual

2.4.4 Terminal Resistor (SW6,SW8)

The onboard termination resistor (120 ohm) for COM1, COM2 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 2.6: Jumper setting of terminal resistor
DIP Status
ON
1
OFF
ON
2
OFF
Table 2.7: Mapping table of Jumper/DIP for COM port
Jumper for RS-232
COM port and RS-422/485
selection
COM1 CN12
COM2 CN14
Description
Add terminal resistor on Tx+/Tx- of RS-422 or Data+/Data-
of RS-485
No terminal resistor (Default)
Add terminal resistor on Rx+/Rx- of RS-422
No terminal resistor (Default)
SW3 DIP switch
for Auto-flow
control
DIP1
DIP2
17
Jumper for
Terminal
Resistor
SW6
SW8
Chapter 2