I wanted to share my recent success in integrating the Tegui TG-374455 bus intercom with the Nuki Opener. After extensive research and experimentation, I’ve managed to establish a functional connection between the two devices. I believe this information could be valuable to others facing similar challenges.
The Tegui TG-374455 bus intercom is a two-wire system, making it compatible with the Nuki Opener. For the wiring configuration, I referred to the Nuki documentation, specifically the “HOWTO Connect the Nuki Opener to an unknown intercom” guide, from which I derived the connection diagram provided in the image below.
In line with Nuki’s instructions, many intercoms disregard the polarity of the connection, but he Nuki Opener requires correct polarity. The Tegui TG-374455 also behaves similarly and is indifferent to polarity. However, determining the correct BUS polarity is crucial. To achieve this, I used a multimeter to measure the voltage on the bus, toggling the probes until I discerned the positive and negative terminals. In my experience, and as a standard practice in Spain, the light blue wire signifies the positive polarity.
For a visual representation of my wiring setup, you can refer to the image I’ve provided
During the App setup process, I selected the following options:
- Brand: Generic
- Model: Bus(Koch)
It’s worth noting that I initially attempted the “Btcino Bus” configuration, but this led to instability issues. The system exhibited intermittent behavior—sometimes successfully triggering the door, while other times failing to do so.
I hope my experience and the information I’ve shared here prove to be helpful to fellow Nuki users facing the integration of the Tegui TG-374455 intercom with the Nuki Opener. If you have any questions or require further assistance, please don’t hesitate to ask.