How to wire a smart relay to a CAME ZN8 gate — yourself, step by step

1. Switch off the drive (breaker in the panel). Open the board cover and find the command terminal block.
2. Find the button terminals (1)(2) by the labels on the board — not from memory, board revisions differ.
3. Connect the two wires of the relay dry output to those two terminals. Polarity does not matter (dry contact).
4. Relay power: Remootio — from the board 12–24 V terminals or USB; Shelly — per its model. Never from the command terminals.
5. In the app: output mode «pulse / momentary» 0.5–1 s. Connect the status sensor if you have one.
6. Power on, test from the button, then from the app. Photocells and force limiting must work as before.

• ❌ Mistake: a relay with a 230 V output (power relay) on the command input — the board burns.
• ❌ Mistake: bridging command to STOP or removing STOP/PHOT jumpers — the gate stops moving or the fuse blows.
• ❌ Mistake: relay output left «on» — the board sees a held button and ignores further commands.

The relay bridges (1)(2) — points (1) and (2) in the drawing. A short pulse = one command (open → stop → close). CAME terminals are numbered.

Wire the relay in parallel with the existing button — the same two terminals. Button and remotes keep working.

1. Relay output in momentary / pulse mode (0.5–1 s), like a button press. Not «permanently on».
2. App command → relay click → the gate moves just like from the button.
3. Open / closed status: limit switch or magnetic sensor → relay sensor input → state visible in the app (Remootio ships with a sensor).
4. Scenes: geofence opening, schedule, voice, camera-at-gate linkage.

This board has no separate «always open / always close» inputs — control is one toggle command.

Relay and modules for this board: