The BMS in InterContinental hotel includes all subsystems: boiler rooms, heating rooms, air conditioning units, fan coil systems, water heaters, swimming pool technics etc. It is specifi c for its size and network topology. LON-IP routers were used here, which convert the LON communication by fl oors into TCP/IP and thus enable a large fl ow in the central part of the network which connects all subsystems by fl oors to the control center.