What is KNX Standard ?
KNX is, to make is simple, home automation standard for managing lighting, blinds, climate control, hvac, security systems and multimedia systems. Standard was created as evolution of three standards European Instillation Bus (known as EIB), European Home System Protocol (EHS) and BatiBUS. Device certification and all protocols used for communication are signed by KNX organization. This is guarantee that device will work inside KNX system.
Devices in system can be connected using several communication media: twisted pair wiring (most common way), power line, Radio (RF) or using Ethernet communication. When everything is connected, it is regardless how you have connected device to KNX system. Devices will communicate with all other devices in that system. For twisted pair communication media, 2x2x0.8 JY(sty)y cable need to be used.
Basic KNX system will include: power supply (to give power needed by BUS), sensor (to send some signal to BUS like touch sensor or lighting sensor) and actuator to do some action (open/close circuit or so). When you push sensor (or some level of lighting is detected) sistem will send telegram to BUS, and “search” for actuator that need to act if this sensor is pressed. Really simple 🙂
KNX system can link 57.375 devices, divided in several lines and areas. Yes, this is kind of limitation, but after that you can connect them over IP . Let’s say that system size is really endless.
One of big advantages is topology of system, because BUS (twisted pair as most common way of interconnection) can be created as line, parallel, star, tree or any other topology. Only thing that need to be respect is BUS limitation in length and number of devices connected per one system. Thought different couplers (IP or BUS) you can expand system limitless.
KNX is worldwide standard for Home and building control, based on 25 years of experience and data exchanging now with more that 450 manufactures. Point is that all of this manufactures that have “signed” KNX Standard uses same protocol for communication between devices. As result, all devices that have KNX standard (protocol) can communicate and exchange information’s. Home owner or installer have possibility to mix devices from different manufactures as they need it / like it! So, you have big pool of devices and systems that can be connected to KNX installation, and it is on installer or designer (at the end on homeowner) to choose design of functions that they need for every particular installation.
IoT in KNX
In last years, KNX is start to open to IoT technology. In another words start to lower barrier that he had in past with this kind of devices. This is big advantage of KNX, as IoT is growing really fast. Last several years it is common that all devices are somehow smart or have some smart capabilities. KNX is giving possibility to integrate some of that devices in your smart house system. In future, this will for sure be big segment of KNX standard.
Also, KNX Secyre is part of KNX association commitment to secure communication. This is still newbee, but with new devices and software solutions communication can be encrypted acording to AES128 standard. This will lower risk of unwanted connections and data exchange on system, and will give users and home owners possibility to protect their system.