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.
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Standard field bus system (EN13757-2 / EN13757-3)
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Two-wire bus with power supply of the bus users
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No special requirements to the bus cable (electricity installation cable or telephone cable is enough)
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Almost any wiring topology (line, star and tree)
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Large extension (up to some kilometers)
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Remote reading of consumption data (heat, water, gas and electricity ..)
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Communication with sensors and actuators of any type
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Energy monitoring and - optimisation
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Leakage monitoring
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Applicable in the industry and in private households
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Good availability of system components
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Superior costing / performance relation
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Remote read out with modem possible from any place