The Common Logic Unit (CLU) module is the central unit of the Grenton hybrid (wired - wireless) system. It handles device logics and stores configurations (e.g. button configuration, light scenes, logic, scenarios). CLU communicates with the other extension modules included in the Smart Home via wire bus (Grenton TF-Bus) and by Z-wave radio if necessary. In larger and more advanced systems it is also possible to build a grid of CLUs by connecticg them through an Ethernet interface.