KNX is technology which controls the automation of integral functions of any residential, commercial, or industrial building such as HVAC, lighting systems, multimedia, security, energy management and more.

In this article you will learn everything you need to know about KNX technology, how KNX works and why you should consider integrating KNX systems either in existing buildings or during construction for your next building project.

What is KNX?

To transfer control data to all building management components (or smart home devices/functions), a system is required that avoids the problem of having isolated devices speaking ‘different languages’.

KNX devices can manage lighting, blinds and shutters, HVAC, security systems, energy management, audio video, white goods, displays, remote control, etc.

Unlike proprietary protocols (which only the manufacturer supports), KNX is an open worldwide standard with over 300 different manufacturers producing products that all inter-work and operate together seamlessly.

KNX works by ensuring all components, devices, features, and functions of any building (or outdoor space) communicate via one common language instantly and remotely.

How does KNX work?

The KNX bus line is the main central nervous system for all automatons. It is a green cable which is installed in addition to the conventional mains supply during a new build or renovation project.

All the various building technology elements are then connected to one another vis the main KNX bus line in accordance with the KNX standard for building automation.

The cable system is then managed by such things as sensors, detectors, parameters, etc. — which can then be conveniently controlled by end users with a laptop, smart phone or tablet device.

The KNX bus is routed in parallel to the electrical power supply to all devices and systems on the network linking:

  • Sensors (e.g., push buttons, thermostats, anemometers, movement) gather information and send it on the bus as a data telegram.
  • Actuators (dimming units, heating valves, displays) receive data telegrams which are then converted into actions;
  • Controllers and other logic functions (room temperature controllers, shutter controllers and other)
  • System devices and components (e.g., line couplers, backbone couplers).