FprEN 1434-3

SLOVENSKI STANDARD
oSIST prEN 1434-3:2023
01-november-2023
Nadomešča:
SIST EN 1434-3:2016
Merilniki toplote - 3. del: Izmenjava podatkov in vmesniki
Thermal energy meters - Part 3: Data exchange and interfaces
Thermische Energiezähler - Teil 3: Datenaustausch und Schnittstellen
Compteurs d'énergie thermique - Partie 3 : Échange de données et interfaces
Ta slovenski standard je istoveten z: prEN 1434-3
ICS:
17.200.10 Toplota. Kalorimetrija Heat. Calorimetry
oSIST prEN 1434-3:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 1434-3:2023
oSIST prEN 1434-3:2023
DRAFT
EUROPEAN STANDARD
prEN 1434-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2023
ICS Will supersede EN 1434-3:2015
English Version
Thermal energy meters - Part 3: Data exchange and
interfaces
Compteurs d'énergie thermique - Partie 3 : Échange de Thermische Energiezähler - Teil 3: Datenaustausch und
données et interfaces Schnittstellen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 294.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1434-3:2023 E
worldwide for CEN national Members.

oSIST prEN 1434-3:2023
prEN 1434-3:2023(E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Meter interfaces and protocols overview . 4
5 Physical layer . 5
5.1 General. 5
5.2 Physical layer optical interface . 5
5.3 Physical layer M-Bus . 5
5.4 Physical layer wireless interface. 5
6 Link layer . 5
6.1 Link layer optical interface . 5
6.1.1 Link layer optical interface with the EN 13757-2 protocol . 5
6.1.2 Link layer optical interface with automatic protocol recognition . 5
6.2 Link layer of M-Bus . 5
6.3 Link layer wireless interface . 6
7 Application layer . 6
7.1 Application layer optical interface . 6
7.2 Application layer M-Bus and Local Bus . 6
7.2.1 General. 6
7.2.2 Coding of data records . 6
8 Application . 6
8.1 General. 6
8.2 Physical layer . 6
8.3 Link layer . 6
8.4 Application layer . 7
8.5 Control applications . 7
Annex A (informative) Recommendation for thermal energy meter test interface . 8
Annex B (informative) Additional information for thermal energy meters . 9
Annex C (informative) Automatic protocol detection and wake-up for the optical interface
................................................................................................................................................................... 10
Annex D (informative) Usage of thermal energy meters in control applications . 11
Annex E (Informative) Protection techniques for M-Bus meters against surge/lightning . 14
Annex F (informative) Additional information about the master-unit for the M-Bus . 15
Bibliography . 18
oSIST prEN 1434-3:2023
prEN 1434-3:2023 (E)
European foreword
This document (prEN 1434-3:2023) has been prepared by Technical Committee CEN/TC 294
“Communication systems for meters”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1434-3:2015.
EN 1434-3:2023 includes the following significant technical changes with respect to EN 1434-3:2015:
a) Editorial change from heat to thermal energy meters in accordance to the EN 1434-series,
b) deletion of Annex B,
c) protocol modes according to EN 62056-21 for the optical interface of heat meters are no longer
supported,
d) deletion of (sub)Clauses 6.1.2, 6.4, and C.3 (regarding EN 62056-21 protocol) as well as in subclause
7.1,
e) Clause 5.5 Physical layer current loop interface was deleted and Table 1 updated,
f) Clause 5.6 Physical layer local bus was deleted in accordance with the withdrawal of EN 13757-6,
g) Clause 6.4 Link layer current-loop interface was deleted,
h) Annex E was moved to EN 13757-2.
EN 1434 consists of the following parts, under the general title “Thermal energy meters”:
— Part 1: General requirements
— Part 2: Constructional requirements
— Part 3: Data exchange and interfaces (this document)
— Part 4: Pattern approval tests
— Part 5: Initial verification tests
— Part 6: Installation, commissioning, operational monitoring and maintenance
oSIST prEN 1434-3:2023
prEN 1434-3:2023(E)
1 Scope
This document specifies the general requirements of data exchange and interfaces for thermal energy
meters.
This document is applicable to unidirectionally and bidirectionally transmitting thermal energy meters.
This document applies also to networks with up to 250 meters, for which a master unit with AC mains
supply is necessary to control the M-Bus. In these cases, the document is only applicable in conjunction
with EN 13757-2 (physical and link layer) and EN 13757-3 (application layer).
For wireless thermal energy meter communications, this document is only applicable in conjunction with
EN 13757-4, which describes several alternatives of walk/drive-by readout via a mobile station or by
using stationary receivers or a network.
NOTE Thermal energy 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
thermal energy in legal units.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13757-2, Communication systems for meters - Part 2: Wired M-Bus communication
EN 13757-3:2023, Communication systems for meters and remote reading of meters — Part 3: Dedicated
application layer
EN 13757-4, Communication systems for meters - Part 4: Wireless M-Bus communication
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Meter interfaces and protocols overview
Table 1 — Possible combinations of interfaces and standards
Hardware interface type Recommended standard Alternative standards
Optical EN 13757-2 No alternative
EN 62056-21:2002, 3.2
M-Bus EN 13757-2 No alternative
Wireless EN 13757-4 and EN 13757-5 No alternative
Application layer EN 13757-3 EN 13757-1
(All interfaces)
oSIST prEN 1434-3:2023
prEN 1434-3:2023 (E)
5 Physical layer
5.1 General
A meter can have either none or a number of interfaces to communicate with the outside world. If a meter
has an interface in accordance with this standard, it shall fulfil at least one of the following requirements
for the physical layer.
5.2 Physical layer optical interface
The optical interface is used for local data readout. A hand-held unit, equipped with an optical readout
head, is temporarily connected to one thermal energy meter and the data are read out, one thermal
energy meter at a time. The physical properties of the optical interface are defined in EN 62056-21.
5.3 Physical layer M-Bus
The physical layer of the M-Bus is described in EN 13757-2. It can be used for “point to point” or for
“multi-point” communication in bus systems. If a thermal energy meter presents more than one unit load
to the bus, the number of unit loads has to be shown on the meter documentation as “xUL” where x is the
number of unit loads. Only integer values are allowed. Especially in extended installation, meters with an
M-Bus interface might need additional protection against surge and lightning. EN 13757-2:2023Error! B
ookmark not defined., Annex B shows various techniques for either constructing meters with an M-bus
interface and integrated enhanced protection elements. In addition, it shows how to construct external
protection elements for meters with a standard (unprotected) M-Bus interface. Two variants are given:
one (preferred) for situation where a ground connection is available and a variant with weaker protection
if no ground connection is available. An enhanced version of the protection additionally protects the
meter and its interface from destruction if mains power is connected to the M-Bus terminals of the meter.
If the readout frequency of the meter is limited either by software or by the battery capacity, the meter
documentation shall signal the readout frequency as “x per day”, “y per h” or “z per min” where x, y or z
are the number of readouts within the corresponding period allowed by the software without impairing
the battery lifetime. Thermal energy meters with unlimited readout frequency do not need such
information.
5.4 Physical layer wireless interface
The physical layer wireless interface shall be according to EN 13757-4.
6 Link layer
6.1 Link layer optical interface
6.1.1 Link layer optical interface with the EN 13757-2 protocol
If the optical interface is used with the EN 13757-2 protocol, a wake-up message can be sent after every
idle time of > 330 bit times to the thermal energy meter. The wake up message consists of zeroes and
ones alternating at the desired baud rate for a duration of (2,2 ± 0,1) s. After an idle time of 33 bit times
to 330 bit times, the communication can start.
6.1.2 Link layer optical interface with automatic protocol recognition
If the user or the hand-held unit does not know
...