A door configured with entry and exit readers using AC1/AC1A will report door switch trouble after controller is reloaded.
NOTE: There is no problem if AC1Plus modules are used.
Attach resistors to exit side AC1's door switch, the resistor configuration on the exit AC1 must match the resistor configuration on the entry AC1. DO NOT wire the inputs on the exit AC1 to anything.
Only the door switch has this requirement, the REX input does not require adding resistors to the exit AC1.
See IO System Reference Guide connecting a dual reader door for wiring information.