Editing KNX (section)

== Standard ==
The KNX standard has been built on the [[OSI model|OSI]]-based [[European Installation Bus|EIB]] [[Protocol stack|communication stack]] extended with the [[physical layer]]s, configuration modes and application experience of [[BatiBUS]] and [[European Home Systems Protocol|EHS]].

KNX installations can use several physical communication media:

* [[Twisted pair]] wiring (TP1 Cable) (inherited from the EIB standard). (The previously inherited [[BatiBUS]] communication medium (TP0) is no longer part of the KNX Specifications.) 
*[[Power-line communication|Power-line]] networking (inherited from EIB standard). (The previously inherited [[European Home Systems Protocol|EHS]] communication medium (PL132) is no longer part of the KNX Specifications.)
* [[Radio frequency|Radio]] (KNX-RF) 
* IP (also referred to as EIBnet/IP or KNXnet/IP)

KNX is not based on a specific hardware platform and a network can be controlled by anything from an 8-bit [[microcontroller]] to a PC, according to the demands of a particular building. The most common form of installation is over twisted pair medium.

KNX is an approved standard by the following organisations, ([[inter alia]]):<ref>{{Cite web|url=https://www2.knx.org/no/knx/association/what-is-knx/index.php|title=What is KNX?|website=National KNX Norway|access-date=2018-07-07|archive-date=2015-09-25|archive-url=https://web.archive.org/web/20150925082921/http://www.knx.org/no/knx/association/what-is-knx/index.php|url-status=dead}}</ref>

* International standard (ISO/IEC 14543-3)
* European standard ([[European Committee for Electrotechnical Standardization|CENELEC]] EN 50090 and CEN EN 13321–1)
*US standard ([[American National Standards Institute|ANSI]]/[[ASHRAE]] 135)
* China [[Guobiao standards|Guobiao]] (GB/T 20965)

It is administered by the KNX Association [[List of business entities|cvba]], a non-profit organisation governed by Belgian law which was formed in 1999. The KNX Association had 500 registered hardware and software vendor members from 45 nations as at 1 July 2021. It had partnership agreements with 100,000 installer companies in 172 countries and more than 500 registered training centres.<ref>The current vendor list can be found at knx.org: {{Cite web|url=https://www.knx.org/knx-en/for-professionals/community/index.php|title=KNX Community}}</ref> This is a royalty-free [[open standard]] and thus access to the KNX specifications is unrestricted.<ref>{{Cite web|url=https://my.knx.org/en/shop/knx-specifications|title=KNX Specifications|website=KNX}}</ref>