RS422/RS485 data input series resistor
Only single-ended, unidirectional signals can be terminated using a series resistor at the driver.

RS485 is balanced so termination is different. The resistor goes between the balanced pair at the receiver for point-to-point. For multi-point, you daisy chain and terminate at each end of the daisy chain (not stubs) if the driver is not sitting there. The resistor is supposed to match the characteristic line impedance but not so high it forces the driver to source too much current. Usually 60-120 ohms.

For short distances (&lt;10m), you don't need one at all for RS-422/485, especially at low data rates (&lt;1MBPS).