To integrate your existing ButterflyMX video intercom system with Openpath, connect a dry contact relay from each intercom touchscreen to a REX input on the Openpath ACU. Twisted pair wiring is recommended. For new installations, note that 18 AWG wire is recommended for ButterflyMX power connections.
Additionally, you can wire a REX sensor in parallel with the intercom (figure figures 1 and 2) or directly to your locking hardware (figure 2figures 3 and 4), depending on the door location and building code requirements.
Option 1: Wiring REX in parallel with the intercom
Figure 12: Wiring ButterflyMX intercom with optional in-parallel REX to 4-Door ControllerPort Board
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Figure 2: Wiring ButterflyMX intercom with optional in-parallel REX to 4-Port BoardDoor Controller
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Option 2: Wiring REX to locking hardware
Figure 34: Wiring ButterflyMX intercom with optional REX to mag lock on 4-Door ControllerPort Board
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Figure 4: Wiring ButterflyMX intercom with optional REX to mag lock on 4-Port BoardDoor Controller
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Note on using ButterflyMX intercom for access:
If you plan on using the ButterflyMX Card Reader intercom’s card reader for access (without an Openpath Smart Reader), run the W0, W1 and GND signals from the ButterflyMX intercom to a Wiegand input on the 4-Door Controller or any I/O pair on the 4-Port, 8-Port, or 16 I/O Elevator Board. The ButterflyMX intercom power supply and the ACU power supply should share a common ground. See How to wire Wiegand devices to Core Series hardware.
If you are installing an Openpath Smart Reader at the same entry as the ButterflyMXintercom, connect the Wiegand W0 and W1 signals from the ButterflyMX intercom directly to the WD0 (Green) and WD1 (White) wires on the Smart Reader pigtail.
The REX signal can also pass back to the ACU in the same cable bundle as the Smart Reader wires if there is a spare twisted pair available. Run power for the ButterflyMX intercom separately, since it requires may require heavier gauge wires.
Additional resources
Learn more about Openpath integrationsLearn more about the ButterflyMX integration