The CTD Controller (Patent Pending) is the heart of your QBus system. The Controller controls and supplies power to all Qbus modules connected via the usual two-wire bus: flexible and easy to install.   Each controller has an on-board SD memory card on which all actions that happen on the bus are stored. That data can be used by the Qbus EQOmmand software to visualize, predict and optimize energy consumption.   Each CTD has a standard USB port to adapt your system to your liking in an easy way. Optionally, each controller can have an Ethernet port via which you can securely communicate with your controller over the internet.