SIST EN 62056-21:2004

SLOVENSKI STANDARD
SIST EN 62056-21:2004
01-januar-2004
1DGRPHãþD
SIST EN 61107:1997
Electricity metering - Data exchange for meter reading, tariff and load control - Part
21: Direct local data exchange (IEC 62056-21:2002)
Electricity metering - Data exchange for meter reading, tariff and load control -- Part 21:
Direct local data exchange
Messung der elektrischen Energie - Zählerstandsübertragung, Tarif- und Laststeuerung -
- Teil 21: Datenübertragung für festen und mobilen Anschluss
Equipements de mesure de l'énergie électrique - Echange des données pour la lecture
des compteurs, le contrôle des tarifs et de la charge -- Partie 21: Echange des données
directes en local
Ta slovenski standard je istoveten z: EN 62056-21:2002
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
35.100.01 Medsebojno povezovanje Open systems
odprtih sistemov na splošno interconnection in general
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST EN 62056-21:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 62056-21:2004

---------------------- Page: 2 ----------------------

SIST EN 62056-21:2004
EUROPEAN STANDARD EN 62056-21
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2002
ICS 17.220.20;35.100;91.140.50 Supersedes EN 61107:1996
English version
Electricity metering -
Data exchange for meter reading, tariff and load control
Part 21: Direct local data exchange
(IEC 62056-21:2002)
Equipements de mesure Messung der elektrischen Energie -
de l'énergie électrique - Zählerstandsübertragung,
Echange des données pour la lecture Tarif- und Laststeuerung
des compteurs, le contrôle des tarifs Teil 21: Datenübertragung für festen
et de la charge und mobilen Anschluss
Partie 21: Echange des données (IEC 62056-21:2002)
directes en local
(CEI 62056-21:2002)
This European Standard was approved by CENELEC on 2002-05-01. CENELEC 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.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62056-21:2002 E

---------------------- Page: 3 ----------------------

SIST EN 62056-21:2004
EN 62056-21:2002 - 2 -
Foreword
The text of document 13/1271/FDIS, future edition 1 of IEC 62056-21, prepared by IEC TC 13,
Equipment for electrical energy measurement and load control, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as EN 62056-21 on 2001-05-01.
This European Standard supersedes EN 61107:1996.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-05-01
The International Electrotechnical Commission (IEC) and CENELEC draw attention to the fact that it is
claimed that compliance with this International Standard / European Standard may involve the use of a
maintenance service concerning the stack of protocols on which the present standard IEC 62056-21 /
EN 62056-21 is based.
The IEC and CENELEC take no position concerning the evidence, validity and scope of this
maintenance service.
The providers of the maintenance service have assured the IEC that they are willing to provide services
under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In
this respect, the statements of the providers of the maintenance service are registered with the IEC.
Information may be obtained :
Manufacturer's identification, item 12) of 6.3.2: from
The FLAG Association, UK
www.dlms.com/flag
Enhanced identification character, item 24) of 6.3.2: from
1)
DLMS User Association
Geneva / Switzerland
www.dlms.ch
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes A, B, E and ZA are normative and annexes C and D are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62056-21:2002 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 62056-61 NOTE Harmonized as EN 62056-61:2002 (not modified).
IEC 62056-62 NOTE Harmonized as EN 62056-62:2002 (not modified).
__________

1)
Device Language Message Specification

---------------------- Page: 4 ----------------------

SIST EN 62056-21:2004
- 3 - EN 62056-21:2002
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60050-300 2001 International Electrotechnical --
Vocabulary - Electrical and electronic
measurements and measuring
instruments
Part 311: General terms relating to
measurements
Part 312: General terms relating to
electrical measurements
Part 313: Types of electrical measuring
instruments
Part 314: Specific terms according to
the type of instrument
IEC/TR 62051 1999 Electricity metering - Glossary of terms - -
IEC 62056-42 2002 Electricity metering - Data exchange for EN 62056-42 2002
meter reading, tariff and load control
Part 42: Physical layer services and
procedures for connection-oriented
asynchronous data exchange
IEC 62056-46 2002 Part 46: Data link layer using HDLC EN 62056-46 2002
protocol
IEC 62056-53 2002 Part 53: COSEM application layer EN 62056-53 2002
ISO/IEC 646 1991 Information technology - ISO 7-bit--
coded character set for information
interchange
ISO/IEC 1155 1978 Information processing - Use of --
longitudinal parity to detect errors in
information messages
ISO/IEC 1177 1985 Information processing - Character--
structure for start/stop and synchronous
character-oriented transmission
ISO/IEC 1745 1975 Information processing - Basic mode--
control procedures for data
communication systems

---------------------- Page: 5 ----------------------

SIST EN 62056-21:2004
EN 62056-21:2002 - 4 -
Publication Year Title EN/HD Year
ISO/IEC 7480 1991 Information technology - --
Telecommunications and information
exchange between systems - Start/stop
transmission signal quality at DTE/DCE
interfaces
ITU-T 2000 List of definitions for interchange circuits--
Recommendation between data terminal equipment (DTE)
V.24 and data circuit-terminating equipment
(DCE)
ITU-T 1993 Electrical characteristics for unbalanced--
Recommendation double-current interchange circuits
V.28

---------------------- Page: 6 ----------------------

SIST EN 62056-21:2004
����� ���
�������������� ���
��������
�������������
����������������
��������
�������������
�������
�����������������������������������������������
���������������������������������������
������������������� �����������!�������������������
"��������#
�������������������������������������
����������$�����������
%�����&�������!�����������������
����!!�������������������
"������#
%������������������&������
����������������� �
������� �����!��
"��#��"�$���$��%&����

---------------------- Page: 7 ----------------------

SIST EN 62056-21:2004
62056-21 © IEC:2002 – 3 –
CONTENTS
FOREWORD.9
INTRODUCTION.13
1 Scope.15
2 Normative references.15
3 Terms, definitions and abbreviations .17
3.1 Terms and definitions .17
3.2 Abbreviations.19
4 Physical properties .19
4.1 Electrical current loop interface.19
4.2 Electrical interface V.24/V.28 .23
4.3 Optical interface .25
4.3.1 Construction of the reading head.25
4.3.2 Characteristic data of the magnet.25
4.3.3 Arrangement of components in the tariff device.29
4.3.4 Alignment .29
4.3.5 Optical characteristics.29
5 Character transmission .33
5.1 Type of transmission.33
5.2 Transmission speed.33
5.3 Signal quality.33
5.4 Character format .33
5.5 Character code.33
5.6 Character security .33
6 Data transmission protocol.35
6.1 General .35
6.2 Calculation of the block check character .35
6.3 Message definitions .37
6.3.1 Request message .37
6.3.2 Identification message .37
6.3.3 Acknowledgement/option select message .37
6.3.4 Data message (except in programming mode).37
6.3.5 Acknowledgement message.37
6.3.6 Repeat-request message .37
6.3.7 Programming command message .39
6.3.8 Programming command message using optional partial blocks.39
6.3.9 Data message (programming mode) .39
6.3.10 Data message (programming mode) using optional partial blocks .39
6.3.11 Error message (programming mode) .39
6.3.12 Break message (programming mode).39
6.3.13 Block message (other protocols) .39
6.3.14 Explanations of message contents .41

---------------------- Page: 8 ----------------------

SIST EN 62056-21:2004
62056-21 © IEC:2002 – 5 –
6.4 Communication modes .47
6.4.1 Protocol mode A .47
6.4.2 Protocol mode B .49
6.4.3 Protocol mode C .53
6.4.4 Protocol mode D .61
6.4.5 Protocol mode E (other protocols) .61
6.4.6 Entering programming mode (unknown tariff device) .63
6.4.7 Partial block communication (optional, only in protocol mode C) .65
6.5 Syntax diagrams.71
6.5.1 Readout mode .73
6.5.2 Programming mode .75
6.6 Data set structure .77
Annex A (normative) Flow chart for direct local data exchange protocol, protocol mode C .81
Annex B (normative) Wake-up methods for battery-operated tariff devices.85
Annex C (informative) Formatted codes.89
Annex D (informative) Levels of access – system security . 127
Annex E (normative) METERING HDLC protocol using protocol mode E for direct local
data exchange . 129
Bibliography . 137
Index . 139
Figure 1 – Circuit diagrams .23
Figure 2 – Construction of the reading head .25
Figure 3 – Characteristic data of the magnet .27
Figure 4 – View into optical port .29
Figure 5 – Test arrangement for the transmitter.31
Figure 6 – Test arrangement for the receiver .31
Figure 7 – Setting up a block check character (example according to ISO/IEC 1155) .35
Figure 8 – Diagram protocol mode A .47
Figure 9 – Transmission protocol for protocol mode A .49
Figure 10 – Diagram protocol mode B .51
Figure 11 – Transmission protocol for protocol mode B.51
Figure 12 – Diagram protocol mode C .55
Figure 13 – Transmission protocol for protocol mode C giving data readout without
acknowledgement from the HHU .57
Figure 14 – Transmission protocol for protocol mode C giving data readout with
confirmation of the suggested baud rate .57
Figure 15 – Transmission protocol for protocol mode C giving data readout with rejection
of the suggested baud rate.59
Figure 16 – Transmission protocol for protocol mode C. Switching to programming mode
with acceptance of the suggested baud rate .59

---------------------- Page: 9 ----------------------

SIST EN 62056-21:2004
62056-21 © IEC:2002 – 7 –
Figure 17 – Transmission protocol for protocol mode C. Switching to programming mode
with rejection of the suggested baud rate.59
Figure 18 – Diagram protocol mode D .61
Figure 19 – Transmission protocol for protocol mode D .61
Figure 20 – Diagram for entering programming mode .63
Figure 21 – Example of a partial block unformatted read.67
Figure 22 – Example of a partial block formatted write.69
Figure 23 – Example of a partial block formatted write (with errors) .71
Figure 24 – Syntax diagrams – readout mode .73
Figure 25 – Syntax diagrams – programming mode – command.75
Figure 26 – Syntax diagram – programming mode – answer .77
Figure 27 – Data set structure .77
Figure A.1 – Flow chart for direct local data exchange protocol, protocol mode C.81
Figure B.1 – The start sequence for battery-operated devices.85
Figure B.2 – Diagram for the start sequence of battery-operated devices by fast
wake-up mode .87
Figure C.1 – Example of channel types.91
Figure C.2 – Register coding diagram.97
Figure C.3 – Bit assignment for group data. 111
Figure C.4 – Vector diagrams for quadrants I to IV . 125
Figure E.1 – Entering protocol mode E (HDLC). 129
Figure E.2 – Flow chart and switchover to METERING HDLC in protocol mode E. 131
Figure E.3 – Physical layer primitives . 133
Figure E.4 – Physical layer primitives, simplified example with one mode change only . 133
Table 1 – Electrical interface .19
Table 2 – Read, Write and Execute commands .65

---------------------- Page: 10 ----------------------

SIST EN 62056-21:2004
62056-21 © IEC:2002 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICITY METERING –
DATA EXCHANGE FOR METER READING,
TARIFF AND LOAD CONTROL –
Part 21: Direct local data exchange
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this International Standard may involve the use of a maintenance
service concerning the stack of protocols on which the present standard IEC 62056-21 is
based.
The IEC takes no position concerning the evidence, validity and scope of this maintenance
service.
The provider of the maintenance service has assured the IEC that he is willing to provide
services under reasonable and non-discriminatory terms and conditions with applicants
throughout the world. In this respect, the statement of the provider of the maintenance service
is registered with the IEC. Information may be obtained:
Manufacturer's identification, item 12) of 6.3.2: from
The FLAG Association, UK
www.dlms.com/flag
Enhanced identification character, item 24) of 6.3.2: from
DLMS User Association
Geneva / Switzerland
www.dlms.ch

---------------------- Page: 11 ----------------------

SIST EN 62056-21:2004
62056-21 © IEC:2002 – 11 –
International Standard IEC 62056-21 has been prepared by IEC Technical Committee 13:
Equipment for electrical energy measurement and load control.
This first edition IEC 62056-21 cancels and replaces the second edition of IEC 61107
published in 1996 and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
13/1271/FDIS 13/1277/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
Annexes A, B and E form an integral part of this standard.
Annexes C and D are for information only.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
The committee has decided that the contents of this publication will remain unchanged until
2006. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

---------------------- Page: 12 ----------------------

SIST EN 62056-21:2004
62056-21 © IEC:2002 – 13 –
INTRODUCTION
IEC TC 13 has the task of preparing standards for data exchange for the purposes of meter
reading, tariff and load control, and consumer information using various alternative
communication media, with reference to ISO and ITU standards.
Meter data exchange can be local or remote. This part of IEC 62056 is restricted to local data
exchange, whereas remote data exchange is covered by other standards of the IEC 62056
series.

---------------------- Page: 13 ----------------------

SIST EN 62056-21:2004
62056-21 © IEC:2002 – 15 –
ELECTRICITY METERING –
DATA EXCHANGE FOR METER READING,
TARIFF AND LOAD CONTROL –
Part 21: Direct local data exchange
1 Scope
This part of IEC 62056 describes hardware and protocol specifications for local meter data
exchange. In such systems, a hand-held unit (HHU) or a unit with equivalent functions is
connected to a tariff device or a group of devices.
The connection can be permanent or disconnectable using an optical or electrical coupling. An
electrical interface is proposed for use with a permanent connection, or when more than one
tariff device needs to be read at one site. The optical coupler should be easily disconnectable
to enable data collection via an HHU.
The protocol permits reading and programming of tariff devices. It is designed to be particularly
suitable for the environment of electricity metering, especially as regards electrical isolation
and data security. While the protocol is well-defined, its use and application are left to the user.
This standard is based on the reference model for communication in open systems. It is
enhanced by further elements such as an optical interface, protocol controlled baud rate
switchover, data transmission without acknowledgement of receipt. The protocol offers several
modes for implementation in the tariff device. The HHU or equivalent unit acts as a master
while the tariff device acts as a slave in protocol modes A to D. In protocol mode E, the HHU
acts as a client and the tariff device acts as a server.
As several systems are in practical use already, particular care was taken to maintain
compatibility with existing systems and/or system components and their relevant protocols.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this International Standard are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. Members of
IEC and ISO maintain registers of currently valid International Standards.
IEC 60050-300:2001, International Electrotechnical Vocabulary (IEV) – Electrical and electronic
measurements and measuring instruments – Part 311: General terms relating to measurements
– Part 312: General terms relating to electrical measurements – Part 313: Types of electrical
measuring instruments – Part 314: Specific terms according to the type of instrument

---------------------- Page: 14 ----------------------

SIST EN 62056-21:2004
62056-21 © IEC:2002 – 17 –
IEC 62051:1999, Electricity metering – Glossary of terms
IEC 62056-42:2002, Electricity metering – Data exchange for meter reading, tariff and load
control – Part 42: Physical layer services and procedures for connection oriented
asynchronous data exchange
IEC 62056-46:2002, Electricity metering – Data exchange for meter reading, tariff and load
control – Part 46: Data link layer using HDLC-protocol
IEC 62056-53:2002, Electricity metering – Data exchange for meter reading, tariff and load
control – Part 53: COSEM application layer
ISO/IEC 646:1991, Information technology – ISO 7-bit coded character set for information
interchange
ISO/IEC 1155:1978, Information processing – Use of longitudinal parity to detect errors in
information messages
ISO/IEC 1177:1985, Information processing – Character structure for start/stop and
synchronous character-oriented transmission
ISO/IEC 1745:1975, Information processing – Basic mode control procedures for data
c
...