Sorry perhaps I should have been a little more clear. In the included link, they provide calculations for fail-safe resistor network. The calculations seems to imply that on a single pair, from TX to RX, you would have 120ohm on each end of the pair. No matter multi-drop or not, each RS422 pair is still considered "one direction", there is no TX enable like 485, so I don't see the point in terminating both ends.