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

Figure 2: Wiring intercom with optional in-parallel REX to 4-Door Controller.

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

Using the Intercom for Access

1. Without an Avigilon Alta Smart Reader:

   • If you are using the intercom’s card reader for access without an Avigilon Alta Smart Reader, connect 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.

   • Ensure the intercom and ACU power supply share a common ground.

   • Refer to How to Wire Wiegand Devices to Core Series Hardware for more details.

2. With an Avigilon Alta Smart Reader:

   • If an Avigilon Alta Smart Reader is installed at the same entry as the intercom:

     • Connect the Wiegand W0 and W1 signals from the intercom to the Smart Reader pigtail’s WD0 (Green) and WD1 (White) wires.

3. Additional Considerations:

   • The REX signal can be routed back to the ACU using the same cable bundle as the Smart Reader wires, provided a spare twisted pair is available.

   • Run power for the intercom separately, as it may require heavier gauge wires.

Additional resources

Learn more about Avigilon Alta integrations