M-Bus is a standard widely used for remote reading of various types of utility meters and sensors. The interface receives the measurement data from the Energy Meters by its infrared side port and power supply directly from the bus, so that only the bus wiring (a standard twisted pair telephone cable) must be connected. The interface is suitable for both single phase and three phase Energy Meters and allows the remote reading of all the measure registers. Status bytes are available as well, containing information about the status of the Energy Meters (running tariff nominal, voltage and current range overflow). Commands can be sent via M-Bus for resetting the energy accounts.