What is the KNX Protocol?

May 18, 2015

The KNX Protocol, an open standard for intelligent buildings, communicates over a 2-wire bus and addresses a range of applications. The European market has seen growth in the adoption rates in recent years and the standard could become a useful tool for home technology professionals in the U.S. market. 

We asked CEDIA EMEA volunteer Simon Buddle, Education Director of CEDIA EMEA, to answer a few questions about KNX and give us some information on how it will affect the home technology industry. 

CEDIA: What is the KNX protocol?

SIMON BUDDLE: The KNX protocol was developed from the European Installation Bus originally created by Siemens. 

One of the strengths of the KNX system, is that any product labeled with the KNX trademark is not a mere declaration of the manufacturer but rather is based on conformity testing carried out by KNX-accredited third-party test labs. During these tests, it is not only checked that the device supports the KNX protocol but also that its useful data is coded according to the KNX standardized data types.
Any manufacturer can get one of their products KNX certified should they wish.

CEDIA: How does the KNX protocol affect the home technology industry?

SB: KNX offers end-users with a wide choice of products that interconnect and communicate without the need for expensive bridges or interfaces. Keypad choices grow daily, so many aesthetic options are available for clients to choose from. With dynamic displays, heating/lighting/blinds/audio, and door intercom capabilities from a single manufacturer/product set, the aesthetic argument becomes very compelling. It is therefore bringing wider choice, greater control features, and at a lower price point. 

CEDIA: The European market has seen growth in adoptions rates recently. Do you see this happening in the U.S. and other countries as well? If so, why?

SB: It really started life in the commercial arena, but M&E consultants and architects are seeing value in it for use in high-end homes.
Because it is not tied to a single manufacturer, typically there is a wider selection of products, and they can be chosen for the right function rather than (on occasion) either interfacing or simply creating a one-off bespoke product or code module.  
In Europe, the heating functionality is key; most keypads can provide PI demand-based percentage requests that talk directly to the manifold/actuator valve heads. This means no interfacing between systems and a far more robust solution for the customer.

It is growing rapidly in many countries from Russia to India.

Will it come to the USA? I think it is inevitable but how wide spread I don’t know.

Looking to learn more about the KNX Protocol? Check out our related Emerging Trends webinar, What's the KNX Protocol? on May 21, 2015 at 1:00 p.m. (ET).


  1. 2 dwi 21 Jul
    That's really cool. I would be interested in seeing more graphs of different information you pull from these logs.

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  2. 1 Mary 14 Jun
    Love the way you take this opinion



CEDIA blog posts are intended to provide general information and should not be regarded as legal opinions or advice.

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