KNX is an open standard (see EN 50090, ISO/IEC 14543) for commercial and residential building automation. KNX devices can manage lighting, blinds and shutters, HVAC, security systems, energy management, audio video, white goods, displays, remote control, etc. KNX evolved from three earlier standards; the European Home Systems Protocol (EHS), BatiBUS, and the European Installation Bus (EIB or Instabus).
It can use twisted pair (in a tree, line or star topology), powerline, RF, or IP links. On this network, the devices form distributed applications and tight interaction is possible. This is implemented via interworking models with standardised datapoint types and objects, modelling logical device channels.

In May 1999 , a member of the following associations founded the KNX Association CVBA:

EIBA (European Tire Assembly Association)

EHSA (European Home Systems Association)

BCI (BatiBUS International Club)

The Association is the owner of the World STANDARD for Home and Building Management: KNX, as well as the owner of the KNX trademark logo worldwide. The KNX Association is a non-profit organization whose activities are regulated by Belgian law. Members are manufacturers developing devices for several KNX-based home and building management applications, such as lighting control, blinds control, heating, ventilation, air conditioning, energy management, measurement, monitoring, alarm/security systems, home appliances, audio/video and more. more.