EIB (European Installation Bus) has a decentralized structure, which supports linear, loop, tree or star topology. It is primarily designed for electrical installations in buildings, and the connected devices can be supplied by electricity directly over the bus. KNX is a successor to the EIB standard with more features. M-Bus is used for connecting gauges, e.g. electricity meters, water meters and so on. LON is a widespread bus for buildings with LonTalk protocol. BACnet protocol is today very often implemented in its version BACnet/IP – a complex protocol defining objects, services and their links.