For RS422
Add 120 ohm dip resistor to loop T+ and R+ (see below photo)
Add 120 ohm dip resistor to loop T- and R- (see below photo)

For RS485
Add 120 ohm dip resistor to loop D+ and D- (see below photo)

Terminal/shutdown resistor function usually not needed if distance is 200 meters or less.

Sometimes 120 ohm is not the proper resistance value depending on actual environment, if so, please try bigger or smaller resistance value of dip resistors to find the best fit.