How to connect Push-to-Exit Button and Motion Sensor to REX Input (ButterflyMX 2 Door Controller) – ButterflyMX Help Center

Purpose

This guide explains how to connect a push-to-exit (PTE) button and a motion sensor in parallel to a REX input on the ButterflyMX 2 Door Controller to enable door unlocking from either device.

Prerequisites

ButterflyMX 2 Door Controller installed and powered
Door lock connected and functioning
Access to REX terminals (REX & SNS)
Push-to-exit button (dry contact)
Motion sensor with relay output (dry contact)
Low-voltage wiring (18–22 AWG recommended)

Important Warning

All connections must be hardwired

Devices must provide dry contact outputs (NO/COM)

Do NOT apply voltage to REX terminals

Ensure proper and secure wiring

Wiring Summary (Parallel Connection)

Push To Exit	Motion Sensor	2-Door Controller Terminal
COM	COM	SNS
NO	NO	REX

Procedure

Locate REX and SNS terminals on the controller.
Prepare wiring using 18–22 AWG cable and strip ends.
Connect PTE COM and Motion Sensor COM to the SNS terminal.
Connect PTE NO and Motion Sensor NO to the REX terminal.
Secure all connections and check for loose wires.
Test push-to-exit button and verify door unlock.
Test the motion sensor and verify door unlock.
Validate that both devices trigger independently.

Troubleshooting

Issue: Neither device works
Solution: Check wiring and confirm dry contact output.

Issue: Only one device works
Solution: Inspect the wiring of the non-working device.

Issue: Door unlocks randomly
Solution: Adjust motion sensor sensitivity and check wiring.

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