This European Standard applies to heat meters, that is to instruments intended for measuring the heat which,
in a heat-exchange circuit, is absorbed or given up by a liquid called the energy-conveying liquid. The meter
indicates heat in legal units.
Electrical safety requirements are not covered by this standard.
Part 3 specifies the data exchange between a meter and a readout device (POINT / POINT communication).
For these applications using the optical readout head, the EN 62056-21 protocol is recommended.
For direct or remote local readout of a single or a few meters via a battery driven readout device, the physical
layer of EN 13757-6 (local bus) is recommended.
For bigger networks with up to 250 meters, a master unit with AC mains supply according to EN 13757-2 is
necessary to control the M-Bus. For these applications the physical and link layer of EN 13757-2 and the
application layer of EN 13757-3 is required.
For wireless meter communications, EN 13757-4 describes several alternatives of walk/drive-by readout via a
mobile station or by using stationary receivers or a network. Both unidirectionally and bidirectionally transmitting
meters are supported by this standard.