When wiring REX devices as standalone and in sequence/serial, all of the REX devices have to be Normally Closed (NC). If any are Normally Open (NO), they won't work properly. If they are wired in parallel, they need to be Normally Open (NO).
NOTE: If using Bosch or WBOX brand REX devices, they need to be wired to NO (Normally Open) and C (Common) instead of NC (Normally Closed) and C (Common).
The ground wire from the power supply runs through the NC (Normally closed) and the C (Common) of the REX.
The basic standalone connection consists of the REX (Request to Exit) device and a power supply. The power supply voltage must be between 12 and 24 VDC.
The REX is mounted in the desired location with an 18/5 wire from the REX to the controller (18/3 for a non-powered REX).
Use the designated (+) or (-) board voltage out of NO and NC. If the jumper is off, the relay is a standard dry contact needing input into common (C).
Connect a wire from the REX negative (V-) to the negative of the door controller terminal block.
Connect a wire from the REX positive (V+) to the positive of the door controller terminal block.
- Connect a wire from the REX Common (C) to the NC (Normally Closed) door controller terminal block.
- Connect the green wire from the REX Normally Open (NO) to the B port of the door controller DPS terminal block (if reporting is needed).