EN 1434-3:2015

European foreword
1 Scope
2 Normative references
3 Meter interfaces and protocols overview
4 Physical layer
5 Link layer
6 Application layer
7 Application
Annex A (informative) - Recommendation for heat meter
        test interface
Annex B (informative) - Additional information for heat
        meters
Annex C (informative) - Automatic protocol detection
         and wake-up for the optical interface
Annex D (informative) - Usage of heat meters in control
        applications
Annex E (informative) - Protection techniques for M-Bus
        meters against surge/lightning
Annex F (informative) - Additional information about the
        master-unit for the M-Bus
Bibliography

This European Standard specifies the general requirements and applies to heat meters. Heat meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-conveying liquid. The meter indicates heat in legal units.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.