INTERNATIONAL
STANDARD
IEC
62056-42
First edition
2002-02
Electricity metering –
Data exchange for meter reading,
tariff and load control –
Part 42:
Physical layer services and procedures
for connection-oriented asynchronous
data exchange
Reference number
IEC 62056-42:2002(E)
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INTERNATIONAL
STANDARD
IEC
62056-42
First edition
2002-02
Electricity metering –
Data exchange for meter reading,
tariff and load control –
Part 42:
Physical layer services and procedures
for connection-oriented asynchronous
data exchange
PRICE CODE
IEC 2002 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
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For price, see current catalogue
Commission Electrotechnique Internationale
International Electrotechnical Commission
– 2 – 62056-42 IEC:2002(E)
CONTENTS
FOREWORD ..........................................................................................................................4
1 Scope...............................................................................................................................5
2 Normative references .......................................................................................................5
3 Terms, definitions and abbreviations ................................................................................6
4 Overview ..........................................................................................................................7
5 Service specification.........................................................................................................8
5.1 List of services ........................................................................................................8
5.1.1 Connection establishment/release related services......................................8
5.1.2 Data communication services ......................................................................8
5.1.3 Layer management services ........................................................................8
5.2 Use of the physical layer services ...........................................................................9
5.3 Service definitions ...................................................................................................9
5.3.1 PH-CONNECT.request ................................................................................9
5.3.2 PH-CONNECT.indication ...........................................................................10
5.3.3 PH-CONNECT.confirm ..............................................................................10
5.3.4 PH-ABORT.request ................................................................................... 11
5.3.5 PH-ABORT.confirm ...................................................................................11
5.3.6 PH-ABORT.indication ................................................................................11
5.3.7 PH-DATA.request ......................................................................................12
5.3.8 PH-DATA.indication...................................................................................12
6 Protocol specification ..................................................................................................... 13
6.1 Physical layer protocol data unit ............................................................................13
6.2 Transmission order and characteristics .................................................................13
6.3 Physical layer operation – description of the procedures .......................................13
6.3.1 General .....................................................................................................13
6.3.2 Setting up a physical connection ...............................................................14
6.3.3 The identification service ...........................................................................15
6.3.4 Data communications ................................................................................19
6.3.5 Disconnection of an existing physical connection.......................................19
Annex A (informative) An example: PH service primitives and Hayes commands ..................20
Annex B (informative) Data model and protocol ....................................................................25
Bibliography..........................................................................................................................26
Figure 1 – Typical PSTN configuration ....................................................................................7
Figure 2 – The location of the physical layer ...........................................................................8
Figure 3 – Protocol layer services of the COSEM 3-layer connection oriented profile ..............9
Figure 4 – MSC for physical connection establishment..........................................................15
Figure 5 – MSC for IDENTIFY.request/.response message exchange ...................................17
Figure 6 – Handling the identification service at the COSEM server side...............................17
Figure 7 – Partial state machine for the client side physical layer..........................................18
Figure A.1 – MSC for physical connection request ................................................................20
Figure A.2 – Physical connection establishment at the CALLING station...............................21
Figure A.3 – MSC for physical connection establishment ......................................................22
Figure A.4 – Data exchange between the calling and called stations.....................................23
Figure A.5 – MSC for a physical disconnection .....................................................................24
Figure B.1 – The three-step approach of COSEM .................................................................25
62056-42 IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICITY METERING – DATA EXCHANGE
FOR METER READING, TARIFF AND LOAD CONTROL –
Part 42: Physical layer services and procedures for
connection-oriented asynchronous 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
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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
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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 62056-42 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 for applicants throughout the world. In this respect, the
statement of the provider of the maintenance service is registered with the IEC. Information (see also 6.3.3) may
be obtained from:
DLMS
1
User Association
Geneva / Switzerland
www.dlms.ch
International Standard IEC 62056-42 has been prepared by IEC technical committee 13:
Equipment for electrical energy measurement and load control.
The text of this standard is based on the following documents:
FDIS Report on voting
13/1266/FDIS 13/1272/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.
_________
1
Device Language Message Specification.
