Delta RMC101 - Manual (Page 578)

RMC100 and RMCWin User Manual
6-34
Encoder Wiring
5 Volt differential driver:
NPN Open Collector (NOT RECOMMENDED):
Note: Open collector encoders should only be used in lab environments with very little electrical
noise and short wire runs.
Noise immunity can be improved in the diagram above by adding a capacitor across each RMC
encoder input: from +A to -A, from +B to -B, and from +Z to -Z. Notice the capacitors are
connected to the minus inputs even though no signal wires are connected there. The capacitor
will limit the frequency response of the input. Some suggested capacitor values are listed along
with the resultant frequency response limit:
Capacitor
(µF)
Frequency