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smartify SIEDLE 611+ZER-622 with Shelly plus UNI

make the door opener from the old intercom available on a smartphone

christoph-winklerChristoph Winkler
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In an apartment building, we use an old analogue door intercom system that is no longer supported by the manufacturer. The front door lock can be unlocked by pressing a button on the intercom in the flat.
The system itself must not be changed.

I wanted to be able to unlock the front door from my smartphone, just in case:
a) for myself if I don't have a front door key with me
b) for others when I'm at home to open the front door more quickly for expected guests (not having to walk to the intercom first, but from anywhere in the flat)

I have now installed a Shelly Plus UNI in the intercom system and bridged the lever handle with the Shelly relay.
All I had to do was connect two wires to terminals in the intercom system and connect the Shelly to a USB power supply unit (for the 5 V power supply).
After a few configuration steps in the Shelly's web interface, I can now open the front door from anywhere.

the 611 is usually a 6+n wire intercom working analogue and pretty straight:

2 wires connect the opener at the door to the button in the intercom and the button shortens the wire on pressing. two other wires are connected to the bell.

however, with the ZER 622, this system is changed to become a 1+n wire system working with different voltage levels to indicate functions. So the bell is no longer two separate wires. it is indicated by a rise in the power level from 16 to 24 Volt.

luckily, the opener still works by shortening the 2 wires. :-)

I assume the central module recognises this short circuit to trigger the opener relais at the door.

so it is easy to use the Shelly plus UNI relais to create such a short circuit.

  • 1 × Shelly plus UNI
  • 1 × 5V power supply for the Shelly

View project log

  • 1
    connect Shelly plus UNI

    just connect the two wires of the Shelly Releais (OUT 1) to clamp C and 11 in parallel to the already clamped wires.

    power the Shelly with a separate transformer at 5 

    (I assume you should not take the power of the intercom in order not to disturb their logic of power levels)

    now configure your shelly to your needs an you can trigger the opener from the Shelly Web UI

View all instructions

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