Elsner KNX display Fabro KNX mounted on a white wall in a living room setting

KNX Basics: What KNX Is and How It Powers Smart Building Automation

Q: What happens if a KNX device fails?

KNX systems are very robust, and the devices are designed to continue functioning even if individual components fail.

Q: Is KNX also suitable for existing buildings?

Yes, KNX can easily be retrofitted into existing buildings. Especially KNX radio (KNX RF) is ideal for retrofitting without the need for complex cabling.

Q: How complex is the installation of a KNX system?

The complexity depends on the size of the building and the level of automation desired. In new builds, KNX can be integrated from the start; in existing buildings, KNX RF offers a simple and fast retrofit option.

Key features, benefits and use cases of KNX at a glance

What if your home could think for itself? Imagine a house that automatically adapts to your needs: the lights turn on as you enter a room, the heating knows when you're at home, and when you're away, the system quietly keeps things secure – without you having to lift a finger.

KNX is an internationally established standard that makes exactly this possible. On this page, you'll learn what KNX is all about – and why it's worth understanding the basics if you're looking to build a truly smart home.

Definition

What is KNX?

KNX is the world’s leading standard for building automation. It allows various systems and devices – such as lighting, heating, shading or security technology – to be networked and centrally controlled, creating an intelligent and flexible building.

The system originated in the 1990s as the EIB (European Installation Bus), the result of a collaboration between European manufacturers aiming to create an open standard for building automation. Since 2003, the standard has been globally established under the name KNX.

A major advantage of KNX is its manufacturer independence: there are over 500 manufacturers worldwide offering KNX-certified products. This makes it possible to combine devices from a wide range of brands – unlike proprietary systems, which are restricted to a single manufacturer.

In addition, there is a global network of thousands of system integrators and electricians who can plan, install and commission KNX systems. This is supported by a large and active community that ensures you’re never left alone when questions or challenges arise.

Visit the KNX Association website

Comfort, efficiency and flexibility

Why is KNX beneficial for your home?

Choosing KNX comes with many advantages – especially if you are building a new home or carrying out a major renovation:

Comfort: Control lighting, heating, shading and many other functions centrally – tailored to your daily routines.
Energy efficiency: Save energy by controlling heating, lighting and other consumers based on actual demand – automatically and without compromising on comfort.
Smart protection: KNX can also integrate systems such as smoke detectors or presence simulation to enhance your sense of security.
Future-proofing: As an open standard, KNX is continuously developed. With over 500 manufacturers worldwide, you will always find a wide range of compatible products – now and in the future.
Flexibility: KNX grows with your needs. New devices can be integrated without issue – even years after the initial installation.

And the best part: KNX can also be connected to many other systems via suitable interfaces – such as Modbus, BACnet, DALI, LON, EnOcean, Zigbee or MQTT. This keeps your smart home flexible and open to all kinds of future expansions.

With KNX, you lay the foundation for an intelligent home that adapts to your lifestyle – today and tomorrow.

Intelligent networking of devices

How does KNX work?

KNX is based on a bus system that connects all devices in a building. It is an open communication platform that allows different devices and systems to be integrated and controlled. This means you can centrally manage a wide range of functions in your home – from lighting and heating to shading, security and alarm systems.

Communication between devices takes place via a dedicated cable (in wired KNX systems) or wirelessly via radio frequency (KNX RF). Each KNX device is an active participant in the system and can both send and receive signals. For example, a motion detector can switch on the lights when someone enters a room, or a thermostat can regulate the heating according to the needs of the occupants and the current room temperature.

Control is carried out via various interfaces such as push-buttons, touchscreens, smartphone apps or even automated scenarios based on predefined conditions. For instance, you can set the lights to switch on at a specific time, or have the blinds open automatically when the sun rises.

Presence detectors from Elsner Elektronik mounted on the ceiling

New construction or retrofitting

Is KNX also suitable for my home?

Whether you are building a new home or modernising your existing one, KNX is a flexible solution in both cases.

In new buildings, the system can be planned from the outset. Classic wiring with KNX bus cables ensures a stable and powerful infrastructure that can be tailored to your individual requirements.
KNX can also be integrated into existing buildings, e.g. by using existing installations or targeted retrofits. KNX RF radio technology is also suitable for individual functions or extensions, for example if you want to automate a roller shutter or install an additional push button without new wiring.

KNX RF does not replace a complete bus installation, but offers a practical addition if you want to expand existing systems – without any major construction work.

Discover KNX RF Radio!

Elsner KNX devices in our Online Shop

KNX eTR 205/206 Light

Bouton de contrôle de la température
et lumière

KNX eTR 201/202 Sunblind

Bouton pour température, protection solaire

Cala KNX MultiTouch T

Boutons avec icônes de fonction

Cala KNX MultiTouch T

Boutons avec icônes de fonction

Cala KNX IL, blanc pur RAL 9010

Signal lumineux avec fonction de feu

Vari KNX GPS

Récepteur GPS

KNX B8-TH

Interface, 8 entrées binaires, 2 entrées capteurs

T-KTY82

Capteur de température

Collecteur de données P04i

Collecteur de données météo pour WS1/WS1000

Distributeur P04i

Distributeur de données météo pour P04i

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Bright, modern living room with KNX push button mounted on the wall

Investment with prospects

How much does KNX cost – and what does it depend on?

A KNX system is as individual as your home. The good news is that you do not have to implement everything at once. Even with just a few functions, such as lighting or heating control, you can enter the world of intelligent home automation.

The costs depend on how extensive you want your system to be and which equipment you choose. The spectrum ranges from individual room solutions to complete networking of the entire house.

KNX is a system that grows with your needs: you can add or adapt functions at any time – without being tied to a specific manufacturer. And thanks to intelligent control, you save energy and operating costs in the long term.

Good to know: a KNX system is not only worthwhile in everyday life, but also increases the value of your property.

Lighting, heating, blinds and more

Which devices can I control with KNX?

KNX can control a wide range of devices and systems in your home, including:

Lighting: Automated lighting control for different scenarios.
Heating and air conditioning: Optimisation of temperature depending on the time of day, weather conditions or occupancy.
Blinds and shutters: Automatic control depending on the position of the sun or the time of day.
Security: Integration of alarm systems, smoke detectors and surveillance cameras.
Multimedia: Control of audio, video and entertainment systems.

The possibilities are virtually unlimited and can be tailored to your individual needs.

Black KNX glass push button from Elsner Elektronik

Implementation

How do I find the right KNX system integrator?

An experienced and certified KNX system integrator will ensure that your system is installed correctly and tailored to your needs. You can find KNX system integrators via the KNX Association or ask friends and specialist retailers for recommendations. Make sure you choose a professional who has experience in planning and installing KNX systems.

Visit the KNX Association website

FAQ

Frequently asked questions about KNX

Can I control my KNX system when I am on the move?
Yes, with the right app, you can control your KNX system anytime, anywhere – whether via your smartphone or tablet.

Is KNX secure?
Yes, KNX offers a high level of security. All communication channels are encrypted, and regular updates keep the system up to date.

What happens if a KNX device fails?
KNX systems are very robust and the devices are designed to continue functioning even if individual components fail.

Is KNX also suitable for existing buildings?
Yes, KNX can be easily retrofitted into existing buildings. KNX radio (KNX RF) is an ideal solution for retrofitting, as it does not require any complex cabling.

How long does a KNX system last?
A KNX system is durable and designed for a long service life. The devices are of high quality and are regularly improved with new standards and technologies.

How complex is the installation of a KNX system?
The installation of a KNX system varies in complexity depending on the size of the house and the complexity of the desired automation. KNX can be perfectly integrated into the planning of a new building. In existing buildings, retrofitting with KNX radio is relatively simple and quick to implement.

Author: Elsner Elektronik Editorial Team | Last updated 10/2025

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