

The most common form of installation is over twisted pair medium. 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. IP (also referred to as EIBnet/IP or KNXnet/IP).(The previously inherited EHS communication medium (PL132) is no longer part of the KNX Specifications.) Power-line networking (inherited from EIB standard).(The previously inherited BatiBUS communication medium (TP0) is no longer part of the KNX Specifications.) Twisted pair wiring (TP1 Cable) (inherited from the EIB standard).KNX installations can use several physical communication media: The KNX standard has been built on the OSI-based EIB communication stack extended with the physical layers, configuration modes and application experience of BatiBUS and EHS. This is implemented via interworking models with standardised datapoint types and objects, modelling logical device channels. On this network, the devices form distributed applications and tight interaction is possible. It can use twisted pair (in a tree, line or star topology), powerline, RF, or IP links. KNX evolved from three earlier standards the European Home Systems Protocol (EHS), BatiBUS, and the European Installation Bus (EIB or Instabus). KNX devices can manage lighting, blinds and shutters, HVAC, security systems, energy management, audio video, white goods, displays, remote control, etc. KNX is an open standard (see EN 50090, ISO/IEC 14543) for commercial and residential building automation.
