User manual. KNX communication protocol. 1MNUPRKNX KNX communication protocol for KNX modules. September edition By simply creating a personal MyKNX account you get access to the KNX software, online training sessions, documentation, KNX support and more! Register. KNX is a uniform, manufacturer-independent communication protocol for intelligently networking state-of-the-art home and building system.
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KNX devices can manage lighting, blinds and shutters, HVAC, security systems, energy management, audio video, white goods, displays, remote control, etc. It can use twisted pairpowerlineRFinfrared or Ethernet links in a treeline or star topology.
On this network, the devices form distributed applications and tight interaction is possible. This is implemented via interworking models with standardised datapoint types and objectsmodelling logical device channels.
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: It is administered by the KNX Association cvbaa non-profit organisation governed by Belgian law which was formed in The KNX Association had registered hardware and software vendor members from 44 nations as at 1 July It had partnership agreements with over 77, installer companies in countries and more than registered training centres.
KNX devices are commonly connected by a twisted pair bus and can be modified from a controller. The bus is routed in parallel to the electrical power supply to all devices and systems on the network linking:. Application software, together with system topology and commissioning software, is loaded onto the devices via a system interface component. Installed systems can be accessed via LAN, point to point links, or phone networks for central or distributed control of the system via computers, tablets and touch screens, and smartphones.
Blumotix – Partner Konnex KNX – building automation
Central to the KNX architecture concepts are datapoints inputs, outputs, parameters, and diagnostic data which represent process and control variables in the system. The standardised containers kojnex these datapoints are group objects and interface object properties. The communication system offers a reduced instruction set to read and write datapoint values.
Datapoints have to confirm to standardised datapoint typesthemselves grouped into functional blocks. These functional blocks and datapoint types are related to applications fields, but some of them are of general use such as date and time.
Datapoints may be accessed through unicast or multicast mechanisms. To logically link applications datapoints across the network, KNX has three underlying binding schemes: The common kernel sits on top of the kpnnex layers and the medium-specific data link layer and is shared by all the devices on the KNX Network.
It is OSI 7-layer model compliant:. An installation has to be configured at the network topology level and at individual nodes or devices. Configuration may be achieved through a combination of local activity on the devices such pushing a buttonkonnes active network management communication over the bus peer-to-peer, or konmex centralized master-slave.
Some modes require more active management over the bus, whereas some others are mainly oriented towards local configuration. There are three categories of KNX devices:.
KNX encompasses tools for project engineering tasks such as linking a series of individual devices into a functioning installation and integrating different media and configuration modes. A KNX installation always consists of a set of devices connected to the bus or network. Device models vary according to node roles, capabilities, management features and configuration modes, and are all laid down in the profiles.
Devices may be identified and subsequently accessed throughout the network either by their individual address, or by their unique serial number, depending on the configuration mode. Devices can also disclose both a manufacturer specific reference and functional manufacturer independent information when queried. A KNX wired network can be formed with treeline and star topologies, which can be mixed as needed; ring topologies are not supported.
A tree topology is recommended for a large installation. KNX can link up to 57, devices using bit addresses. Coupling units allow address filtering which helps to improve performance given the limited bus signal speed.
Every bus user has equal data transmission rights and data is exchanged directly peer-to-peer between bus users. SELV power is distributed via the same pair for low-power devices. PL power-line transmission is delivered using spread frequency shift keying signalling with asynchronous transmission of data packets and half duplex bi-directional communication. It also uses CSMA.
KNX Powerline is aimed at smart white goods, but the take-up has been low. An alternative variant, PLhas a carrier frequency centred on RF enables communication in the Ignoring any preamble for medium-specific access and collision control, a frame format is generally:.
Any product labeled with the KNX trademark must be certified to conform with the standards and thus interoperable with other devices by accredited third party test labs. Konndx Wikipedia, the free encyclopedia. For the jazz record label, see Konnex Records.
Actuators Hardware controllers Sensors. Audio and video Heating, ventilation and air conditioning Lighting control system Other systems Robotics Security Thermostat automation.
KNX Association KNX Association [Official website]
Elements Actuators Hardware controllers Sensors.