CSA C900.3:21

CSA 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.