IEC 62056-5-3:2016
(Main)Electricity metering data exchange - The DLMS/COSEM suite - Part 5-3: DLMS/COSEM application layer
Electricity metering data exchange - The DLMS/COSEM suite - Part 5-3: DLMS/COSEM application layer
IEC 62056-5-3:2016 specifies the DLMS/COSEM application layer in terms of structure, services and protocols for COSEM clients and servers, and defines how to use the DLMS/COSEM application layer in various communication profiles. It defines services for establishing and releasing application associations, and data communication services for accessing the methods and attributes of COSEM interface objects, defined in IEC 62056-6-2:2016, using either logical name (LN) or short name (SN) referencing. This second edition cancels and replaces the first edition of IEC 62056-5-3 published in 2013.
Echange des données de comptage de l'électricité - La suite DLMS/COSEM - Partie 5-3: Couche application DLMS/COSEM
L'IEC 62056-5-3:2016 indique la couche application DLMS/COSEM en termes de structure, de services et de protocoles pour les clients et serveurs COSEM, et définit comment utiliser la couche application DLMS/COSEM dans différents profils de communication. Elle définit les services permettant d'établir et de libérer des associations d'applications, ainsi que les services de communication de données permettant d'accéder aux méthodes et aux attributs des objets d'interface COSEM, définis dans l'IEC 62056-6-2, à l'aide du référencement par nom logique (LN) ou par nom abrégé (SN). Cette deuxième édition annule et remplace la première édition de l'IEC 62056-5-3 parue en 2013.
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IEC 62056-5-3 ®
Edition 2.0 2016-03
REDLINE VERSION
INTERNATIONAL
STANDARD
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Electricity metering data exchange – The DLMS/COSEM suite –
Part 5-3: DLMS/COSEM application layer
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IEC 62056-5-3 ®
Edition 2.0 2016-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Electricity metering data exchange – The DLMS/COSEM suite –
Part 5-3: DLMS/COSEM application layer
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220; 35.110; 91.140.50 ISBN 978-2-8322-3218-7
– 2 – IEC 62056-5-3:2016 RLV IEC 2016
CONTENTS
FOREWORD. 8
INTRODUCTION . 2
1 Scope . 11
2 Normative references . 11
3 Terms, definitions and abbreviations . 13
3.1 Terms and definitions . 13
3.2 Abbreviations . 13
4 Overview . 15
4.1 DLMS/COSEM application layer structure . 15
4.2 DLMS/COSEM application layer services . 17
4.2.1 ASO services . 17
4.2.2 Services provided for application association establishment and release . 17
4.2.3 Services provided for data transfer . 18
4.2.4 Layer management services . 23
4.2.5 Summary of DLMS/COSEM application layer services . 23
4.3 DLMS/COSEM application layer protocols . 25
5 Information security in DLMS/COSEM . 25
5.1 Definitions . 25
5.2 General . 25
5.3 Data access security . 26
5.3.1 Overview . 26
5.3.2 No security (lowest level security) authentication . 26
5.3.3 Low Level Security (LLS) authentication . 26
5.3.4 High Level Security (HLS) authentication . 27
5.4 Data transport security . 30
5.4.1 Applying, removing or checking the protection: ciphering and
deciphering . 30
5.4.2 Security context . 31
5.4.3 Security policy . 31
5.4.4 Security suite . 32
5.4.5 Security material . 32
5.4.6 Ciphered xDLMS APDUs . 32
5.4.7 Cryptographic keys . 36
5.4.8 The Galois/Counter Mode of Operation (GCM) . 39
6 DLMS/COSEM application layer service specification . 48
6.1 Service primitives and parameters . 48
6.2 The COSEM-OPEN service . 50
6.3 The COSEM-RELEASE service . 55
6.4 COSEM-ABORT service . 58
6.5 Security parameters .
6.5 Protection and general block transfer parameters . 58
6.6 The GET service . 63
6.7 The SET service . 66
6.8 The ACTION service . 68
6.9 The DataNotification service . 72
6.10 The EventNotification service . 73
6.11 The TriggerEventNotificationSending service . 74
6.12 Variable access specification . 75
6.13 The Read service . 75
6.14 The Write service . 79
6.15 The UnconfirmedWrite service . 82
6.16 The InformationReport service . 83
6.17 Client side layer management services: the SetMapperTable.request . 84
6.18 Summary of services and LN/SN data transfer service mapping . 85
7 DLMS/COSEM application layer protocol specification . 85
7.1 The control function . 85
7.1.1 State definitions of the client side control function . 85
7.1.2 State definitions of the server side control function . 87
7.2 The ACSE services and APDUs . 88
7.2.1 ACSE functional units, services and service parameters . 88
7.2.2 Registered COSEM names . 91
7.2.3 APDU encoding rules . 93
7.2.4 Protocol for application association establishment . 93
7.2.5 Protocol for application association release . 99
7.3 Protocol for the data transfer services . 102
7.3.1 Negotiation of services and options – the conformance block . 102
7.3.2 Confirmed and unconfirmed service invocations . 103
7.3.3 Protocol for the GET service . 105
7.3.4 Protocol for the SET service . 108
7.3.5 Protocol for the ACTION service . 111
7.3.6 Protocol of the DataNotification service . 113
7.3.7 Protocol for the EventNotification service . 113
7.3.8 Protocol for the Read service . 113
7.3.9 Protocol for the Write service . 117
7.3.10 Protocol for the UnconfirmedWrite service . 121
7.3.11 Protocol for the InformationReport service . 122
7.3.12 Protocol of general block transfer mechanism . 123
8 Abstract syntax of ACSE and COSEM APDUs . 134
Annex A (normative) Using the COSEM application layer in various communications
profiles . 149
A.1 General . 149
A.2 Targeted communication environments . 149
A.3 The structure of the profile . 149
A.4 Identification and addressing schemes . 149
A.5 Supporting layer services and service mapping . 150
A.6 Communication profile specific parameters of the COSEM AL services . 150
A.7 Specific considerations / constraints using certain services within a given
profile . 150
A.8 The 3-layer, connection-oriented, HDLC based communication profile . 150
A.9 The TCP-UDP/IP based communication profiles (COSEM_on_IP) . 150
A.10 The S-FSK PLC profile . 150
Annex B (normative) SMS short wrapper . 151
Annex C (informative) AARQ and AARE encoding examples . 152
C.1 General . 152
C.2 Encoding of the xDLMS InitiateRequest / InitiateResponse APDUs . 152
– 4 – IEC 62056-5-3:2016 RLV IEC 2016
C.3 Specification of the AARQ and AARE APDUs . 155
C.4 Data for the examples . 156
C.5 Encoding of the AARQ APDU . 157
C.6 Encoding of the AARE APDU . 160
Annex D (informative) Encoding examples: AARQ and AARE APDUs using a ciphered
application context . 166
D.1 A-XDR encoding of the xDLMS InitiateRequest APDU, carrying a dedicated
key . 166
D.2 Authenticated encryption of the xDLMS InitiateRequest APDU . 167
D.3 The AARQ APDU . 168
D.4 A-XDR encoding of the xDLMS InitiateResponse APDU . 169
D.5 Authenticated encryption of the xDLMS InitiateResponse APDU . 170
D.6 The AARE APDU. 171
D.7 The RLRQ APDU (carrying a ciphered xDLMS InitiateRequest APDU) . 172
D.8 The RLRE APDU (carrying a ciphered xDLMS InitiateResponse APDU) . 173
Annex E (informative) Data transfer service examples . 174
Annex F (informative) Overview of cryptography . 190
F.1 General . 190
F.2 Hash functions . 190
F.3 Symmetric key algorithms . 191
F.3.1 General . 191
F.3.2 Encryption and decryption . 191
F.3.3 Advanced Encryption Standard (AES) . 192
F.3.4 Encryption Modes of Operation . 192
F.3.5 Message Authentication Code . 193
F.3.6 Key establishment . 194
F.4 Asymmetric key algorithms . 194
F.4.1 General . 194
F.4.2 Digital signatures . 195
F.4.3 Key establishment . 195
Annex G (informative) Significant technical changes with respect to IEC 62056-53
62056-5-3 Ed.1.0:2013 . 196
Bibliography . 200
Index . 203
Figure 1 – Structure of the COSEM Application layers . 16
Figure 2 – Summary of DLMS/COSEM AL services . 24
Figure 3 – LLS and HLS authentication .
Figure 3 – Authentication mechanisms during AA establishment . 29
Figure 4 – Data transport security in DLMS/COSEM .
Figure 4 – Structure of service specific global ciphering and dedicated ciphering
APDUs . 34
Figure 5 – Ciphered xDLMS APDUs .
Figure 5 – Structure of general global ciphering and dedicated ciphering APDUs . 35
Figure 6 – Cryptographic protection of xDLMS APDUs using GCM . 42
Figure 7 – Service primitives . 48
Figure 8 – Time sequence diagrams . 49
Figure 9 – Additional service parameters to control cryptographic protection and
general block transfer . 60
Figure 10 – Partial state machine for the client side control function . 86
Figure 11 – Partial state machine for the server side control function . 87
Figure 12 – MSC for successful AA establishment preceded by a successful lower
layer connection establishment . 95
Figure 13 – Graceful AA release using the A-RELEASE service . 100
Figure 14 – Graceful AA release by disconnecting the supporting layer . 101
Figure 15 – Aborting an AA following a PH-ABORT.indication . 102
Figure 16 – MSC of the GET service . 105
Figure 17 – MSC of the GET service with block transfer . 106
Figure 18 – MSC of the GET service with block transfer, long GET aborted . 108
Figure 19 – MSC of the SET service . 109
Figure 20 – MSC of the SET service with block transfer . 109
Figure 21 – MSC of the ACTION service . 111
Figure 22 – MSC of the ACTION service with block transfer . 112
Figure 23 – MSC of the Read service used for reading an attribute . 116
Figure 24 – MSC of the Read service used for invoking a method . 116
Figure 25 – MSC of the Read Service used for reading an attribute, with block transfer . 117
Figure 26 – MSC of the Write service used for writing an attribute . 120
Figure 27 – MSC of the Write service used for invoking a method . 120
Figure 28 – MSC of the Write service used for writing an attribute, with block transfer . 121
Figure 29 – MSC of the Unconfirmed Write service used for writing an attribute . 122
Figure 30 – Partial service invocations and GBT APDUs . 125
Figure 31 – GET service with GBT, switching to streaming . 127
th
Figure 32 – GET service with partial invocations, GBT and streaming, recovery of 4
block sent in the 2nd stream . 128
th
Figure 33 – GET service with partial invocations, GBT and streaming, recovery of 4
th
and 5 blocks . 129
Figure 34 – GET service with partial invocations, GBT and streaming, recovery of last
block . 130
Figure 35 – SET service with GBT, with server not supporting streaming, recovery of
3rd block . 131
Figure 36 – ACTION-WITH-LIST service with bi-directional GBT and block recovery . 132
Figure 37 – DataNotification service with GBT with partial invocation . 133
Figure B.1 – Short wrapper . 151
Figure F.1 – Hash function . 191
Figure F.2 – Encryption and decryption . 192
Figure F.3 – Message Authentication Codes (MACs) . 193
Table 1 – Clarification of the meaning of PDU Size for DLMS/COSEM . 19
Table 2 – Security suites . 32
Table 3 – Security control field .
Table 3 – Ciphered xDLMS APDUs . 33
Table 4 – Use of the fields of the ciphered APDUs . 36
– 6 – IEC 62056-5-3:2016 RLV IEC 2016
Table 5 – Cryptographic keys and their management . 39
Table 6 – Security control byte . 43
Table 7 – Plaintext and additional authenticated data . 43
Table 8 – Example for ciphered APDUs . 45
Table 9 – HLS example with GMAC . 47
Table 10 – Codes for AL service parameters . 50
Table 11 – Service parameters of the COSEM-OPEN service primitives . 51
Table 12 – Service parameters of the COSEM-RELEASE service primitives . 55
Table 13 – Service parameters of the COSEM-ABORT service primitives . 58
Table 14 – Additional service parameters . 61
Table 15 – Security parameters . 62
Table 16 – Service parameters of the GET service . 63
Table 17 – GET service request and response types . 64
Table 18 – Service parameters of the SET service . 66
Table 19 – SET service request and response types . 67
Table 20 – Service parameters of the ACTION service . 69
Table 21 – ACTION service request and response types . 70
Table 22 – Service parameters of the DataNotification service primitives . 72
Table 23 – Service parameters of the EventNotification service primitives . 73
Table 24 – Service parameters of the TriggerEventNotificationSending.request service
primitive . 74
Table 25 – Variable Access Specification . 75
Table 26 – Service parameters of the Read service . 76
Table 27 – Use of the Variable_Access_Specification variants and the Read.response
choices . 77
Table 28 – Service parameters of the Write service . 80
Table 29 – Use of the Variable_Access_Specification variants and the Write.response
choices . 80
Table 30 – Service parameters of the UnconfirmedWrite service . 82
Table 31 – Use of the Variable_Access_Specification variants . 83
Table 32 – Service parameters of the InformationReport service . 84
Table 33 – Service parameters of the SetMapperTable.request service primitives . 84
Table 34 – Summary of ACSE services . 85
Table 35 – Summary of xDLMS services for LN referencing . 85
Table 36 – Summary of xDLMS services for SN referencing . 85
Table 37 – ACSE functional units, services and service parameters . 89
Table 38 – Use of ciphered / unciphered APDUs . 92
Table 39 – xDLMS Conformance block . 103
Table 40 – GET service types and APDUs . 105
Table 41 – SET service types and APDUs . 108
Table 42 – ACTION service types and APDUs . 111
Table 43 – Mapping between the GET and the Read services . 114
Table 44 – Mapping between the ACTION and the Read services . 114
Table 45 – Mapping between the SET and the Write services . 118
Table 46 – Mapping between the ACTION and the Write service . 119
Table 47 – Mapping between the SET and the UnconfirmedWrite services . 122
Table 48 – Mapping between the ACTION and the UnconfirmedWrite services . 122
Table 49 – Mapping between the EventNotification and InformationReport services . 123
Table B.1 – Reserved Application Processes . 151
Table C.1 – Conformance block . 153
Table C.2 – A-XDR encoding of the xDLMS InitiateRequest APDU . 154
Table C.3 – A-XDR encoding of the xDLMS InitiateResponse APDU . 155
Table C.4 – BER encoding of the AARQ APDU . 158
Table C.5 – Complete AARQ APDU . 160
Table C.6 – BER encoding of the AARE APDU . 161
Table C.7 – The complete AARE APDU . 165
Table D.1 – A-XDR encoding of the xDLMS InitiateRequest APDU . 166
Table D.2 – Authenticated encryption of the xDLMS InitiateRequest APDU . 167
Table D.3 – BER encoding of the AARQ APDU . 168
Table D.4 – A-XDR encoding of the xDLMS InitiateResponse APDU . 170
Table D.5 – Authenticated encryption of the xDLMS InitiateResponse APDU . 170
Table D.6 – BER encoding of the AARE APDU . 171
Table D.7 – BER encoding of the RLRQ APDU . 173
Table D.8 – BER encoding of the RLRE APDU . 173
Table E.1 – Objects used in the examples . 174
Table E.2 – Example: Reading the value of a single attribute without block transfer . 175
Table E.3 – Example: Reading the value of a list of attributes without block transfer. 176
Table E.4 – Example: Reading the value of a single attribute with block transfer . 178
Table E.5 – Example: Reading the value of a list of attributes with block transfer . 180
Table E.6 – Example: Writing the value of a single attribute without block transfer . 183
Table E.7 – Example: Writing the value of a list of attributes without block transfer . 184
Table E.8 – Example: Writing the value of a single attribute with block transfer . 185
Table E.9 – Example: Writing the value of a list of attributes with block transfer . 187
– 8 – IEC 62056-5-3:2016 RLV IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –
Part 5-3: DLMS/COSEM application layer
FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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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 62056-5-3 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 may be obtained from:
DLMS User Association
Zug/Switzerland
www.dlms.com
______________
Device Language Message Specification.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
International Standard IEC 62056-5-3 has been prepared by IEC technical committee 13:
Electrical energy measurement and control.
This second edition cancels and replaces the first edition of IEC 62056-5-3 published in 2013.
It constitutes a technical revision.
The significant technical changes with respect to the previous edition are listed in Annex G
(informative).
The text of this standard is based on the following documents:
FDIS Report on voting
13/1648/FDIS 13/1657/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 62056 series, published under the general title Electricity
metering data exchange– The DLMS/COSEM suite, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 10 – IEC 62056-5-3:2016 RLV IEC 2016
INTRODUCTION
This second edition of IEC 62056-5-3 has been prepared by IEC TC13 WG14 with a
significant contribution of the DLMS User Association, its D-type liaison partner.
This edition is in line with the DLMS UA Green Book Edition 7.0 Amendment 3. The main new
features are the DataNotification service, the general protection and the general block
transfer mechanisms and the SMS short wrapper.
In 2014, the DLMS UA has published Green Book Edition 8.0 adding several new features
regarding functionality, efficiency and security while keeping full backwards compatibility.
The intention of the DLMS UA is to bring also these latest developments to international
standardization. Therefore, IEC TC13 WG14 launched a project to bring these new elements
also to the IEC 62056 series that will lead to Edition 3.0 of the standard.
Clause 5 and Annex F are based on parts of NIST documents. Reprinted courtesy of the
National Institute of Standards and Technology, Technology Administration, U.S. Department
of Commerce.
ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –
Part 5-3: DLMS/COSEM application layer
1 Scope
This part of IEC 62056 specifies the DLMS/COSEM application layer in terms of structure,
services and protocols for COSEM clients and servers, and defines how to use the
DLMS/COSEM application layer in various communication profiles.
It defines services for establishing and releasing application associations, and data
communication services for accessing the methods and attributes of COSEM interface
objects, defined in IEC 62056-6-2 :2016, using either logical name (LN) or short name (SN)
referencing.
Annex A (normative) defines how to use the COSEM application layer in various
communication profiles. It specifies how various communication profiles can be constructed
for exchanging data with metering equipment using the COSEM interface model, and what are
the necessary elements to specify in each communication profile. The actual, media-specific
communication profiles are specified in separate parts of the IEC 62056 series.
Annex B (normative) specifies the SMS short wrapper.
Annex C, Annex D and Annex E (informative) include encoding examples for APDUs.
Annex F (informative) provides an overview of cryptography.
Annex G (informative) lists the main technical changes in this edition of the standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61334-4-41:1996, Distribution automation using distribution line carrier systems – Part 4:
Data communication protocols – Section 41: Application protocols – Distribution line message
specification
IEC 61334-6:2000, Distribution automation using distribution line carrier systems – Part 6:
A-XDR encoding rule
IEC TR 62051:1999, Electricity metering – Glossary of terms
______________
To be published simultaneously with this part of IEC 62056.
– 12 – IEC 62056-5-3:2016 RLV IEC 2016
IEC TR 62051-1:2004, Electricity metering – Data exchange for meter reading, tariff and load
control – Glossary of terms – Part 1: Terms related to data exchange with metering equipment
using DLMS/COSEM
IEC 62056-1-0, Electricity metering data exchange – The DLMS/COSEM suite – Part 1-0:
Smart metering standardisation framework
IEC 62056-6-1:2015, Electricity metering data exchange – The DLMS/COSEM suite –
Part 6-1: Object Identification System (OBIS)
IEC 62056-6-2:2016, Electricity metering data exchange – The DLMS/COSEM suite –
Part 6-2: COSEM interface classes
IEC 62056-8-3:2013, Electricity metering data exchange – The DLMS/COSEM suite –
Part 8-3: Communication profile for PLC S-FSK neighbourhood networks
ISO/IEC 8824-1:2008, Information technology – Abstract Syntax Notation One (ASN.1):
Specification of basic notation
ISO/IEC 8825-1:2008, Information technology – ASN.1 encoding rules: Specification of Basic
Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules
(DER)
ISO/IEC 15953:1999, Information technology – Open Systems Interconnection – Service
definition for the Application Service Object Association Control Service Element
NOTE This standard cancels and replaces ISO/IEC 8649-1:1999 and its Amd. 1:1997 and Amd. 2:1998, of which it
constitutes a technical revision.
ISO/IEC 15954:1999, Information technology – Open Systems Interconnection – Connection-
mode protocol for the Application Service Object Association Control Service Element
NOTE This standard cancels and replaces ISO/IEC 8650-1:1999 and its Amd. 1:1997 and Amd. 2:1998, of which it
constitutes a technical revision.
FIPS PUB 180-1:2002, Secure hash standard
FIPS PUB 180-4:2012, Secure hash standard
FIPS PUB 197:2001, Advanced Encryption Standard (AES)
NIST SP 800-38D:2007, Recommendation for Block Cipher Modes of Operation:
Galois/Counter Mode (GCM) and GMAC
NIST SP 800-57:2006, Recommendation for Key Management – Part 1: General (Revised)
The following RFCs are available online from the Internet Engineering Task Force (IETF):
http://www.ietf.org/rfc/s
...
IEC 62056-5-3 ®
Edition 2.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electricity metering data exchange – The DLMS/COSEM suite –
Part 5-3: DLMS/COSEM application layer
Échange des données de comptage de l'électricité – La suite DLMS/COSEM –
Partie 5-3: Couche application DLMS/COSEM
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IEC 62056-5-3 ®
Edition 2.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electricity metering data exchange – The DLMS/COSEM suite –
Part 5-3: DLMS/COSEM application layer
Échange des données de comptage de l'électricité – La suite DLMS/COSEM –
Partie 5-3: Couche application DLMS/COSEM
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220; 35.110; 91.140.50 ISBN 978-2-8322-3019-0
– 2 – IEC 62056-5-3:2016 IEC 2016
CONTENTS
FOREWORD. 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 11
3 Terms, definitions and abbreviations . 13
3.1 Terms and definitions . 13
3.2 Abbreviations . 13
4 Overview . 15
4.1 DLMS/COSEM application layer structure . 15
4.2 DLMS/COSEM application layer services . 16
4.2.1 ASO services . 16
4.2.2 Services provided for application association establishment and release . 16
4.2.3 Services provided for data transfer . 17
4.2.4 Layer management services . 22
4.2.5 Summary of DLMS/COSEM application layer services . 22
4.3 DLMS/COSEM application layer protocols . 22
5 Information security in DLMS/COSEM . 23
5.1 Definitions . 23
5.2 General . 23
5.3 Data access security . 24
5.3.1 Overview . 24
5.3.2 No security (lowest level security) authentication . 24
5.3.3 Low Level Security (LLS) authentication . 24
5.3.4 High Level Security (HLS) authentication . 25
5.4 Data transport security . 27
5.4.1 Applying, removing or checking the protection: ciphering and
deciphering . 27
5.4.2 Security context . 28
5.4.3 Security policy . 28
5.4.4 Security suite . 29
5.4.5 Security material . 29
5.4.6 Ciphered xDLMS APDUs . 29
5.4.7 Cryptographic keys . 31
5.4.8 The Galois/Counter Mode of Operation (GCM) . 34
6 DLMS/COSEM application layer service specification . 43
6.1 Service primitives and parameters . 43
6.2 The COSEM-OPEN service . 45
6.3 The COSEM-RELEASE service . 50
6.4 COSEM-ABORT service . 52
6.5 Protection and general block transfer parameters . 53
6.6 The GET service . 57
6.7 The SET service . 59
6.8 The ACTION service . 62
6.9 The DataNotification service . 66
6.10 The EventNotification service . 67
6.11 The TriggerEventNotificationSending service . 68
6.12 Variable access specification . 69
6.13 The Read service . 69
6.14 The Write service . 73
6.15 The UnconfirmedWrite service . 76
6.16 The InformationReport service . 77
6.17 Client side layer management services: the SetMapperTable.request . 78
6.18 Summary of services and LN/SN data transfer service mapping . 78
7 DLMS/COSEM application layer protocol specification . 79
7.1 The control function . 79
7.1.1 State definitions of the client side control function . 79
7.1.2 State definitions of the server side control function . 81
7.2 The ACSE services and APDUs . 82
7.2.1 ACSE functional units, services and service parameters . 82
7.2.2 Registered COSEM names . 85
7.2.3 APDU encoding rules . 87
7.2.4 Protocol for application association establishment . 87
7.2.5 Protocol for application association release . 92
7.3 Protocol for the data transfer services . 95
7.3.1 Negotiation of services and options – the conformance block . 95
7.3.2 Confirmed and unconfirmed service invocations . 96
7.3.3 Protocol for the GET service . 98
7.3.4 Protocol for the SET service . 101
7.3.5 Protocol for the ACTION service . 104
7.3.6 Protocol of the DataNotification service . 106
7.3.7 Protocol for the EventNotification service . 106
7.3.8 Protocol for the Read service . 106
7.3.9 Protocol for the Write service . 110
7.3.10 Protocol for the UnconfirmedWrite service . 114
7.3.11 Protocol for the InformationReport service . 115
7.3.12 Protocol of general block transfer mechanism . 116
8 Abstract syntax of ACSE and COSEM APDUs . 127
Annex A (normative) Using the COSEM application layer in various communications
profiles . 142
A.1 General . 142
A.2 Targeted communication environments . 142
A.3 The structure of the profile . 142
A.4 Identification and addressing schemes . 142
A.5 Supporting layer services and service mapping . 143
A.6 Communication profile specific parameters of the COSEM AL services . 143
A.7 Specific considerations / constraints using certain services within a given
profile . 143
A.8 The 3-layer, connection-oriented, HDLC based communication profile . 143
A.9 The TCP-UDP/IP based communication profiles (COSEM_on_IP) . 143
A.10 The S-FSK PLC profile . 143
Annex B (normative) SMS short wrapper . 144
Annex C (informative) AARQ and AARE encoding examples . 145
C.1 General . 145
C.2 Encoding of the xDLMS InitiateRequest / InitiateResponse APDUs . 145
C.3 Specification of the AARQ and AARE APDUs . 148
– 4 – IEC 62056-5-3:2016 IEC 2016
C.4 Data for the examples . 149
C.5 Encoding of the AARQ APDU . 150
C.6 Encoding of the AARE APDU . 153
Annex D (informative) Encoding examples: AARQ and AARE APDUs using a ciphered
application context . 159
D.1 A-XDR encoding of the xDLMS InitiateRequest APDU, carrying a dedicated
key . 159
D.2 Authenticated encryption of the xDLMS InitiateRequest APDU . 160
D.3 The AARQ APDU . 161
D.4 A-XDR encoding of the xDLMS InitiateResponse APDU . 162
D.5 Authenticated encryption of the xDLMS InitiateResponse APDU . 163
D.6 The AARE APDU. 164
D.7 The RLRQ APDU (carrying a ciphered xDLMS InitiateRequest APDU) . 165
D.8 The RLRE APDU (carrying a ciphered xDLMS InitiateResponse APDU) . 166
Annex E (informative) Data transfer service examples . 167
Annex F (informative) Overview of cryptography . 183
F.1 General . 183
F.2 Hash functions . 183
F.3 Symmetric key algorithms . 184
F.3.1 General . 184
F.3.2 Encryption and decryption . 184
F.3.3 Advanced Encryption Standard (AES) . 185
F.3.4 Encryption Modes of Operation . 185
F.3.5 Message Authentication Code . 186
F.3.6 Key establishment . 187
F.4 Asymmetric key algorithms . 187
F.4.1 General . 187
F.4.2 Digital signatures . 188
F.4.3 Key establishment . 188
Annex G (informative) Significant technical changes with respect to IEC 62056-5-3
Ed.1.0:2013 . 189
Bibliography . 191
Index . 194
Figure 1 – Structure of the COSEM Application layers . 15
Figure 2 – Summary of DLMS/COSEM AL services . 22
Figure 3 – Authentication mechanisms during AA establishment . 27
Figure 4 – Structure of service specific global ciphering and dedicated ciphering
APDUs . 30
Figure 5 – Structure of general global ciphering and dedicated ciphering APDUs . 30
Figure 6 – Cryptographic protection of xDLMS APDUs using GCM . 37
Figure 7 – Service primitives . 43
Figure 8 – Time sequence diagrams . 44
Figure 9 – Additional service parameters to control cryptographic protection and
general block transfer . 54
Figure 10 – Partial state machine for the client side control function . 80
Figure 11 – Partial state machine for the server side control function . 81
Figure 12 – MSC for successful AA establishment preceded by a successful lower
layer connection establishment . 88
Figure 13 – Graceful AA release using the A-RELEASE service . 93
Figure 14 – Graceful AA release by disconnecting the supporting layer . 94
Figure 15 – Aborting an AA following a PH-ABORT.indication . 95
Figure 16 – MSC of the GET service . 98
Figure 17 – MSC of the GET service with block transfer . 99
Figure 18 – MSC of the GET service with block transfer, long GET aborted . 101
Figure 19 – MSC of the SET service . 102
Figure 20 – MSC of the SET service with block transfer . 102
Figure 21 – MSC of the ACTION service . 104
Figure 22 – MSC of the ACTION service with block transfer . 105
Figure 23 – MSC of the Read service used for reading an attribute . 109
Figure 24 – MSC of the Read service used for invoking a method . 109
Figure 25 – MSC of the Read Service used for reading an attribute, with block transfer . 110
Figure 26 – MSC of the Write service used for writing an attribute . 113
Figure 27 – MSC of the Write service used for invoking a method . 113
Figure 28 – MSC of the Write service used for writing an attribute, with block transfer . 114
Figure 29 – MSC of the Unconfirmed Write service used for writing an attribute . 115
Figure 30 – Partial service invocations and GBT APDUs . 118
Figure 31 – GET service with GBT, switching to streaming . 120
th
Figure 32 – GET service with partial invocations, GBT and streaming, recovery of 4
block sent in the 2nd stream . 121
th
Figure 33 – GET service with partial invocations, GBT and streaming, recovery of 4
th
and 5 blocks . 122
Figure 34 – GET service with partial invocations, GBT and streaming, recovery of last
block . 123
Figure 35 – SET service with GBT, with server not supporting streaming, recovery of
3rd block . 124
Figure 36 – ACTION-WITH-LIST service with bi-directional GBT and block recovery . 125
Figure 37 – DataNotification service with GBT with partial invocation . 126
Figure B.1 – Short wrapper . 144
Figure F.1 – Hash function . 184
Figure F.2 – Encryption and decryption . 185
Figure F.3 – Message Authentication Codes (MACs) . 186
Table 1 – Clarification of the meaning of PDU Size for DLMS/COSEM . 18
Table 2 – Security suites . 29
Table 3 – Ciphered xDLMS APDUs . 29
Table 4 – Use of the fields of the ciphered APDUs . 31
Table 5 – Cryptographic keys and their management . 34
Table 6 – Security control byte . 38
Table 7 – Plaintext and additional authenticated data . 38
Table 8 – Example for ciphered APDUs . 40
Table 9 – HLS example with GMAC . 42
– 6 – IEC 62056-5-3:2016 IEC 2016
Table 10 – Codes for AL service parameters . 45
Table 11 – Service parameters of the COSEM-OPEN service primitives . 46
Table 12 – Service parameters of the COSEM-RELEASE service primitives . 50
Table 13 – Service parameters of the COSEM-ABORT service primitives . 53
Table 14 – Additional service parameters . 55
Table 15 – Security parameters . 56
Table 16 – Service parameters of the GET service . 57
Table 17 – GET service request and response types . 58
Table 18 – Service parameters of the SET service . 60
Table 19 – SET service request and response types . 61
Table 20 – Service parameters of the ACTION service . 63
Table 21 – ACTION service request and response types . 64
Table 22 – Service parameters of the DataNotification service primitives . 66
Table 23 – Service parameters of the EventNotification service primitives . 67
Table 24 – Service parameters of the TriggerEventNotificationSending.request service
primitive . 68
Table 25 – Variable Access Specification . 69
Table 26 – Service parameters of the Read service . 70
Table 27 – Use of the Variable_Access_Specification variants and the Read.response
choices . 71
Table 28 – Service parameters of the Write service . 74
Table 29 – Use of the Variable_Access_Specification variants and the Write.response
choices . 74
Table 30 – Service parameters of the UnconfirmedWrite service . 76
Table 31 – Use of the Variable_Access_Specification variants . 77
Table 32 – Service parameters of the InformationReport service . 78
Table 33 – Service parameters of the SetMapperTable.request service primitives . 78
Table 34 – Summary of ACSE services . 79
Table 35 – Summary of xDLMS services for LN referencing . 79
Table 36 – Summary of xDLMS services for SN referencing . 79
Table 37 – ACSE functional units, services and service parameters . 83
Table 38 – Use of ciphered / unciphered APDUs . 86
Table 39 – xDLMS Conformance block . 96
Table 40 – GET service types and APDUs . 98
Table 41 – SET service types and APDUs . 101
Table 42 – ACTION service types and APDUs . 104
Table 43 – Mapping between the GET and the Read services . 107
Table 44 – Mapping between the ACTION and the Read services . 108
Table 45 – Mapping between the SET and the Write services . 111
Table 46 – Mapping between the ACTION and the Write service . 112
Table 47 – Mapping between the SET and the UnconfirmedWrite services . 115
Table 48 – Mapping between the ACTION and the UnconfirmedWrite services . 115
Table 49 – Mapping between the EventNotification and InformationReport services . 116
Table B.1 – Reserved Application Processes . 144
Table C.1 – Conformance block . 146
Table C.2 – A-XDR encoding of the xDLMS InitiateRequest APDU . 147
Table C.3 – A-XDR encoding of the xDLMS InitiateResponse APDU . 148
Table C.4 – BER encoding of the AARQ APDU . 151
Table C.5 – Complete AARQ APDU . 153
Table C.6 – BER encoding of the AARE APDU . 154
Table C.7 – The complete AARE APDU . 158
Table D.1 – A-XDR encoding of the xDLMS InitiateRequest APDU . 159
Table D.2 – Authenticated encryption of the xDLMS InitiateRequest APDU . 160
Table D.3 – BER encoding of the AARQ APDU . 161
Table D.4 – A-XDR encoding of the xDLMS InitiateResponse APDU . 163
Table D.5 – Authenticated encryption of the xDLMS InitiateResponse APDU . 163
Table D.6 – BER encoding of the AARE APDU . 164
Table D.7 – BER encoding of the RLRQ APDU . 166
Table D.8 – BER encoding of the RLRE APDU . 166
Table E.1 – Objects used in the examples . 167
Table E.2 – Example: Reading the value of a single attribute without block transfer . 168
Table E.3 – Example: Reading the value of a list of attributes without block transfer. 169
Table E.4 – Example: Reading the value of a single attribute with block transfer . 171
Table E.5 – Example: Reading the value of a list of attributes with block transfer . 173
Table E.6 – Example: Writing the value of a single attribute without block transfer . 176
Table E.7 – Example: Writing the value of a list of attributes without block transfer . 177
Table E.8 – Example: Writing the value of a single attribute with block transfer . 178
Table E.9 – Example: Writing the value of a list of attributes with block transfer . 180
– 8 – IEC 62056-5-3:2016 IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –
Part 5-3: DLMS/COSEM application layer
FOREWORD
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
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 62056-5-3 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 may be obtained from:
DLMS User Association
Zug/Switzerland
www.dlms.com
______________
Device Language Message Specification.
International Standard IEC 62056-5-3 has been prepared by IEC technical committee 13:
Electrical energy measurement and control.
This second edition cancels and replaces the first edition of IEC 62056-5-3 published in 2013.
It constitutes a technical revision.
The significant technical changes with respect to the previous edition are listed in Annex G
(informative).
The text of this standard is based on the following documents:
FDIS Report on voting
13/1648/FDIS 13/1657/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 62056 series, published under the general title Electricity
metering data exchange– The DLMS/COSEM suite, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 10 – IEC 62056-5-3:2016 IEC 2016
INTRODUCTION
This second edition of IEC 62056-5-3 has been prepared by IEC TC13 WG14 with a
significant contribution of the DLMS User Association, its D-type liaison partner.
This edition is in line with the DLMS UA Green Book Edition 7.0 Amendment 3. The main new
features are the DataNotification service, the general protection and the general block
transfer mechanisms and the SMS short wrapper.
In 2014, the DLMS UA has published Green Book Edition 8.0 adding several new features
regarding functionality, efficiency and security while keeping full backwards compatibility.
The intention of the DLMS UA is to bring also these latest developments to international
standardization. Therefore, IEC TC13 WG14 launched a project to bring these new elements
also to the IEC 62056 series that will lead to Edition 3.0 of the standard.
Clause 5 and Annex F are based on parts of NIST documents. Reprinted courtesy of the
National Institute of Standards and Technology, Technology Administration, U.S. Department
of Commerce.
ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –
Part 5-3: DLMS/COSEM application layer
1 Scope
This part of IEC 62056 specifies the DLMS/COSEM application layer in terms of structure,
services and protocols for COSEM clients and servers, and defines how to use the
DLMS/COSEM application layer in various communication profiles.
It defines services for establishing and releasing application associations, and data
communication services for accessing the methods and attributes of COSEM interface
objects, defined in IEC 62056-6-2:2016, using either logical name (LN) or short name (SN)
referencing.
Annex A (normative) defines how to use the COSEM application layer in various
communication profiles. It specifies how various communication profiles can be constructed
for exchanging data with metering equipment using the COSEM interface model, and what are
the necessary elements to specify in each communication profile. The actual, media-specific
communication profiles are specified in separate parts of the IEC 62056 series.
Annex B (normative) specifies the SMS short wrapper.
Annex C, Annex D and Annex E (informative) include encoding examples for APDUs.
Annex F (informative) provides an overview of cryptography.
Annex G (informative) lists the main technical changes in this edition of the standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61334-4-41:1996, Distribution automation using distribution line carrier systems – Part 4:
Data communication protocols – Section 41: Application protocols – Distribution line message
specification
IEC 61334-6:2000, Distribution automation using distribution line carrier systems – Part 6:
A-XDR encoding rule
IEC TR 62051:1999, Electricity metering – Glossary of terms
IEC TR 62051-1:2004, Electricity metering – Data exchange for meter reading, tariff and load
control – Glossary of terms – Part 1: Terms related to data exchange with metering equipment
using DLMS/COSEM
IEC 62056-1-0, Electricit
...
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