M-Bus, what is it?

The M-Bus (meter bus) is a cost-optimized field bus for the transfer of energy consumption data. A central master - in the simplest case a PC with level converter - communicates by a 2 wire bus with the bus users (up to 250 slaves per segment: Heat meter, water meter, electrical meter, gas meter... and also sensors and actuators of any type). 
More and more manufacturer implement the electrical M-Bus interface with protocol layer into their meters. The M-Bus is european standard and described in the standards EN13757-2 and EN13757-3.

• standard field bus system (EN13757-2 / EN13757-3)
• two-wire bus with power supply of the bus users
• no special requirements to the bus cable (electricity installation cable or telephone cable is enough)
• almost any wiring topology (line, star and tree)
• large extension (up to some kilometers)
• remote reading of consumption data (heat, water, gas and electricity ..)
• communication with sensors and actuators of any type
• energy monitoring and - optimization
• leakage monitoring
• applicable in the industry and in private households
• good availability of system components
• superior costing / performance relation
• remote read out with modem possible from any place