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KNX is approved as:

  • International Standard (ISO/IEC14543-3)
  • European Standard (CENELEC EN50090 and CEN EN 13321-1 and 13321-2)
  • Chinese Standard (GB/T 20965)
  • ANSI/ASHRAE Standard (ANSI/ASHRAE 135)

From an Industry to an International Standard:

Convergence of Batibus, EIB and EHS

The predecessor specifications to KNX: Batibus, EIB and EHS, came into being in the early 1990s. At that time nobody could foresee their individual future. These three highly important home grown European solutions for home and building control initially tried to develop their markets separately and tried to find their own places in European standardisation. Batibus did particularly well in France, Italy and Spain, whereas EIB enjoyed success in the German speaking and north European countries. EHS was the preferred solution for manufacturers of white and brown goods. 

In 1997, the three consortia in charge of the above mentioned specifications decided to join forces to develop the market for intelligent homes with the agreed goal to develop a new, common industrial standard that could also be proposed as an international standard. The KNX specification was published by the newly set-up KNX Association in the spring of 2002. It is based on the EIB specification, supplemented with new configuration mechanisms and communication media originally developed by Batibus and EHS.

Batibus, EIB, EHS


In December 2003, the KNX protocol as well as the two media, TP (twisted pair) and PL (power-line) was approved by the European national committees and ratified by the CENELEC Bureau Technique as the EN 50090 European Standard. The KNX Radio Frequency communication medium was approved in May 2006.

EN 50090


As KNX increasingly provides specifications that are not only used for the automation of electrical installation equipment but also for HVAC applications, the KNX Association proposed its specifications to CEN for publication as a European standard for building automation control systems. CEN accepted the proposal and the KNX specifications were published by CEN as EN 13321-1 and EN13321-2 .

EN 13321


In view of the large interest in KNX compatible products outside European countries and its proven technology, the KNX Association also initiated the necessary steps to have the KNX standard approved on an international level. Countries active in CENELEC proposed the European EN 50090 norm for standardization by ISO/IEC at the end of 2004. In November 2006 the KNX protocol, including all transmission media (TP, PL, RF and IP) was approved for publication as the ISO/IEC 14543-3-x International Standard. This makes KNX the only worldwide open standard for home and building control.

ISO 14543


The great interest in China for compatible KNX products and KNX technology was the main reason for the KNX Association to have the international ISO/IEC 14543 Standard translated into Chinese. The Chinese standardisation committee, SAC TC 124  introduced the KNX standard in China and adopted it as standard GB/T 20965 in July 2013.

GBZ 20965


Also the coupling of KNX to other automation systems is internationally standardized: both the US  ANSI/ASHRAE Standard 135 as well as the ISO 16484-5 documents the mapping between KNX and BACnet.