CSA C900.3:21

Preface:

This is the third edition of CSA C900.3, Thermal energy meters — Part 3: Data exchange and interfaces, which is an adoption, with Canadian deviations, of CEN (European Committee for Standardization) Standard EN 1434-3 (third edition, 2015-12) titled Heat meters — Part 3: Data exchange and interfaces. It supersedes the previous edition published in 2013 as CAN/CSA-C900.3 (adopted EN 1434-3:2008).

This Standard is one of a group of Standards on Thermal energy meters being adopted by CSA Group, which consists of the following:
a) CSA C900.1 (adopted EN 1434-1) — Part 1: General requirements;
b) CSA C900.2 (adopted EN 1434-2) — Part 2: Constructional requirements;
c) CSA C900.3 (adopted EN 1434-3) — Part 3: Data exchange and interfaces;
d) CSA C900.4 (adopted EN 1434-4) — Part 4: Pattern approval tests;
e) CSA C900.5 (adopted EN 1434-5) — Part 5: Initial verification tests; and
f) CSA C900.6 (adopted EN 1434-6) — Part 6: Installation, commissioning, operational monitoring and maintenance.

This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.

Scope:

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.