I'm wiring up a quadrature rotary encoder with differential outputs to the spindle of my mill drill.
I'm running a 1 meter shielded twisted pair from the encoder to my speed controller. The encoder outputs using a uA9638C differential line driver, and the speed controller receives using a uA9637C differential line receiver, with a 100 ohm termination resistor.
What I need to do now is add an additional connection to my rotary table controller, so I can synchronise the motion between the rotary table and spindle. This cable will only be connected when the rotary table is used.

What do I need to do with the termination resistor? The datasheet seems to imply I should only have one termination resistor in the circuit. Is it ok to just have it in the first receiver and not on the 2nd one 2 meters away?
