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To integrate your intercom system (Not the Openpath Avigilon Alta Video Intercom Reader Pro) with Avigilon Alta, connect a dry contact relay from each intercom to a REX input on the Openpath Avigilon Alta ACU. Twisted pair wiring is recommended.

Additionally, you can wire a REX sensor in parallel with the intercom (figures 1 and 2) or directly to your locking hardware (figures 3 and 4), depending on the door location and building code requirements. 

Option 1: Wiring REX in parallel with the intercom

Figure 1: Wiring intercom with optional in-parallel REX to 4-Port Board.

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Option 2: Wiring REX to locking hardware

Figure 3: Wiring intercom with optional REX to mag lock on 4-Port Board.

Figure 4: Wiring intercom with optional REX to mag lock on 4-Door Controller.

Note on using the intercom for access:

• If you plan on using the intercom’s card reader for access (without an Openpath Avigilon Alta Smart Reader), run the W0, W1, and GND signals from the 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 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 Avigilon Alta Smart Reader at the same entry as the intercom, connect the Wiegand W0 and W1 signals from the 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 intercom separately, since it may require heavier gauge wires.

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