The two-door Mercury controller, expandable to 34 readers with Alarm.com expansion modules. The board most Alarm.com access installs of any size are built on.
Selora does not recommend this device
Alarm.com access control hardware is licensed to an Alarm.com for Business account. The controllers are standard HID Aero and Mercury boards, but as sold their configuration and credential database live in Alarm.com's cloud, with no local API for Home Assistant.
This is the most reversible lock-in in the range, which is worth knowing. HID Aero and Mercury are open controller platforms that many access control vendors build on, so the panels, readers and wiring are not wasted if a client later changes software. What is bought from Alarm.com is the licence and the cloud, not the boards. For an install that needs door state and unlock events in Home Assistant, choose an access platform with a local API or an on-premise controller, and keep the same Mercury or Aero hardware underneath it.
- An access control platform with a documented local API, running on the same Mercury or HID Aero hardware
- Ubiquiti
- For a single door in a home, a Z-Wave or Matter lock Home Assistant drives directly
Two doors on the controller itself, and up to 34 readers once expansion modules are added, which makes it the board a site of any size is actually built around.
Also sold as the -PSE kit with power supply and enclosure.
Plan the expansion early. The difference between a controller at its limit and one with room is a cabinet and a few boards at first fit, and a second cabinet and a new cable route later.
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