M-Bus
Formal
M-Bus is a European standard covering remote readout of meters and can be used with different types of consumption meters and various types of valves and actuators.
Practical
Data (e.g. heat energy) can be read out electronically. In that case, transmission is serial via a 2-wire line with reversed polarity protection, from the connected slaves (meters) to a master. M-bus meters are available for the acquisition of heat, water, electricity and gas.
