System Manager AK-SM 720 is used for management of complex control systems with alarm and monitoring and for data logging of decentral refrigeration system. AK-SM 750 manages the controllers by means of a data communication network based on LON RS485 or MOD-BUS data communication. More System Managers can be applied by means of IP connections, in order to register measurements from up to 400 controllers. Remote operation is available through modem connection or an IP network. Operation is by means of software type AK-ST.