Dedicated to all things KNX

What is KNX?

KNX was formed in 1999 and is a bus system standard for commercial and domestic building automation,
it is ratified by the International Standards Organisation (ISO/IEC 13543 EN 50090).
KNX is administered by the not for profit KNX association.

KNX evolved from three earlier standards; European Home Systems Protocol (EHS), BatiBUS,
and the European Installation Bus (EIB or Instabus).

Each device has its own device file and memory, devices are programmed from the ETS software.
Data travels from one device to another on the bus (in the case of twisted pair both the power for the device (30V) and data travel along the same single pair)
KNX cable is coloured green and available in single pair (black and red used for bus) or double pair (additional yellow and white pair ).
A device will instigate the same set of commands wherever it is located on the bus, so for example if a light switch is moved
from room A to room B it will still operate the original set of instructions for room A unless it its re-programmed to operate room B.

KNX devices can manage items such as: lighting, blinds and shutters, HVAC, security systems,
energy management, audio video, white goods, displays etc and be controlled from different interfaces such as apps, touch screens, PC’s.

KNX has well over 8,000 products from over 500 companies. Over 500 training centres around the world have trained 90,000 partners.

KNX installations can use communication using:
• Twisted pair wiring (in a tree, line or star topology)
• 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.