How to add RS422 RS485 Termination Resistor to UC840IS

To add RS485 Termination Resistor

Add a Dip type resistor to D+ & D- as a loop (see below photo).

The resistor value is around 100R~120R depending on transmission distance.

To add RS422 Termination Resistor

Add a Dip type resistor to T+ & T- as a loop, and to R+ & R- as a loop (see below photo).

The resistor value is around 100R~120R depending on transmission distance.