ISO/DPAS 15118-202

Road vehicles — Vehicle to grid communication interface — Part 202: Extensible SECC Discovery Protocol and Event Notification Protocol

Véhicules routiers — Interface de communication entre véhicule et réseau électrique — Partie 202: Protocole de découverte SECC extensible et protocole de notification d'événements

General Information

• Status: Not Published
• ICS: 43.120 - Electric road vehicles
• Technical Committee: ISO/TC 22/SC 31 - Data communication
• Drafting Committee: ISO/TC 22/SC 31 - Data communication
• Current Stage: 5000 - FDIS registered for formal approval
• Start Date: 28-Mar-2025
• Completion Date: 03-May-2025

Standards Content (Sample)

FINAL DRAFT
Publicly
Available
Specification
ISO/TC 22/SC 31
Road vehicles — Vehicle to grid
Secretariat: DIN
communication interface —
Voting begins on:
2025-05-12
Part 202:
Extensible SECC Discovery Protocol
Voting terminates on:
2025-07-07
and Event Notification Protocol
Véhicules routiers — Interface de communication entre véhicule
et réseau électrique —
Partie 202: Protocole de découverte SECC extensible et protocole
de notification d'événements
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
Publicly
Available
Specification
ISO/TC 22/SC 31
Road vehicles — Vehicle to grid
Secretariat: DIN
communication interface —
Voting begins on:
Part 202:
Extensible SECC Discovery Protocol
Voting terminates on:
and Event Notification Protocol
Véhicules routiers — Interface de communication entre véhicule
et réseau électrique —
Partie 202: Protocole de découverte SECC extensible et protocole
de notification d'événements
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 SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 2
5 Conventions . 3
5.1 Provision identifiers .3
6 Extensible SECC Discovery Protocol . . 3
6.1 General .3
6.2 Message structure .3
6.2.1 General .3
6.2.2 ESDPSetupReq/Res .4
6.2.3 ESDPReq/Res .5
6.3 Communication .5
6.3.1 General .5
6.3.2 EVCC.5
6.3.3 SECC .7
6.4 Encoding .7
6.5 ESDP extensions .8
6.5.1 General .8
6.5.2 Charging Interface extension .10
6.5.3 Electrical Charging System extension .11
6.5.4 IPv6 Socket extension . 13
6.5.5 TLS 1.2 Info extension .14
6.5.6 Charging Service extension .14
6.5.7 EMSP Info extension .19
6.5.8 AC Charging Parameters extension .19
6.5.9 Conductive Charging Interface Limitations extension. 20
6.5.10 EV Characteristics extension . 20
6.5.11 EVSE Characteristics extension .21
7 Event Notification Protocol .21
7.1 General .21
7.2 Message structure . 22
7.3 Communication . 22
7.3.1 General . 22
7.3.2 EVCC. 23
7.3.3 SECC . 23
7.4 Encoding .24
7.5 ENP extensions .24
7.5.1 General .24
7.5.2 EVSE Grid Information extension . 26
7.5.3 Grid Code Impact Level extension .27
7.5.4 EV Stop Reason extension . 28
7.5.5 EVSE Stop Reason extension . 29
7.5.6 EV Derating Reason extension . 29
7.5.7 EVSE Derating Reason extension . 30
8 Security considerations.32
Bibliography .33

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee
...

ISO/TC 22/SC 31/JWG 1
Secretariat: DIN
Date: 2025-03-2704-25
Road vehicles — Vehicle to grid communication interface — —
Part 202:
Extensible SECC Discovery Protocol and Event Notification
Protocol
DPAS stage
Warning for WDs and CDs
This document is not an ISO International Standard. It is distributed for review and comment. It is subject to
change without notice and may not be referred to as an International Standard.
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.

© ISO #### – All rights reserved

ISO #####-#:####(X)
Véhicules routiers — Interface de communication entre véhicule et réseau électrique —
Partie 202: Protocole de découverte SECC extensible et protocole de notification d'événements
2 © ISO #### – All rights reserved

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
© ISO #### 2025 – All rights reserved
iii
Contents
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 2
5 Conventions . 3
5.1 Provision identifiers . 3
6 Extensible SECC Discovery Protocol . 4
6.1 General. 4
6.2 Message structure . 4
6.3 Communication . 6
6.4 Encoding . 10
6.5 ESDP extensions . 10
7 Event Notification Protocol . 36
7.1 General. 36
7.2 Message structure . 36
7.3 Communication . 37
7.4 Encoding . 39
7.5 ENP extensions . 40
8 Security considerations . 52
Bibliography . 54

© ISO #### 2025 – All rights reserved
iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31, Data
communication.
A list of all parts in the ISO 15118 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
© ISO #### 2025 – All rights reserved
v
Road vehicles — Vehicle to grid communication interface — —
Part 202:
Extensible SECC Discovery Protocol and Event Notification Protocol
1 Scope
This document specifies the Extensible SECC Discovery Protocol (ESDP) as well as the Event Notification
Protocol (ENP) that are intended to be used in conjunction with other protocols as defined in ISO 15118-2 and
ISO 15118-20 as well as documents from other organizations such as DIN or SAE (e.g.,. DIN/TS 70121 or SAE
J2847/2).
These protocols can be used in addition to the existing SECC Discovery Protocol defined by the aforementioned
documents. They offer additional functionality that makes the digital communication for EV charging more
robust and allows to better determine the reason of failures.
In this document, the scope is limited to the already existing communication protocols. Thus, it is only an
addition to already existing communication protocols. Basic requirements regarding for example IP
communication, or the Vehicle-To-Grid Transport Protocol (V2GTP) are not needed, as they are already
specified in the respective document of the used communication protocol.
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.
ISO 3779, Road vehicles — Vehicle identification number (VIN) — Content and structure
ISO 15118-2, Road vehicles — Vehicle-to-grid communication interfaceGrid Communication Interface — Part 2:
Network and application protocol requirements
ISO 15118-20, Road vehicles — Vehicle to grid communication interface — Part 20: 2nd generation network
layer and application layer requirements
ISO 5474-2, Electrically propelled road vehicles — Functional and safety requirements for power transfer
between vehicle and external electric circuit — Part 2: AC power transfer
ISO 5474-3, Electrically propelled road vehicles — Functional and safety requirements for power transfer
between vehicle and external electric circuit — Part 3: DC power transfer
ISO/IEC 8824-1, Information technology — Abstract Syntax Notation One (ASN.1) — Part 1: Specification of
basic notation,
ISO/IEC 8825-7, Information technology — ASN.1 encoding rules — Part 7: Specification of Octet Encoding
Rules (OER)
IEC 61851-1, Electric vehicle conductive charging system - Part 1: General requirements
IEC 61851-23, Electric vehicle conductive charging system - Part 23: DC electric vehicle charging station
IEC 61851-23-3, DC electric vehicle supply equipment for Megawatt charging systems
© ISO #### 2025 – All rights reserved
RFC 4122, A Universally Unique IDentifier (UUID) URN Namespace
RFC 6066, Transport Layer Security (TLS) Extensions: Extension Definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15118-2, ISO 15118-20, IEC 61851-
1, ISO 61851-23 and the following apply.
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/
3.1 3.1
SI unit
unit of measurement
Note 1 to entry: As defined by the "Bureau International des Poids et Mesures" and published in "The International
th
System of Units 9 edition (2019)".
[SOURCE: Reference [0]]]
3.2 3.2
element
complex structure which can contain other complex structures or parameters (3.4(3.4))
EXAMPLE A SEQUENCE or SEQUENCE OF.
3.3 3.3
local grid
electrical grid to which the EV is connected to
Note 1 to entry: It includes all attached energy providers and energy consumers until the grid connection point.
3.4 3.4
parameter
variable whose name and type of values are specified
EXAMPLE Types may be INTEGER or UTF8 string.
[SOURCE: ISO 13584-31:1999, 3.2.4]
4 Abbreviated terms
ASN.1 Abstract Syntax Notation One
CCS Combined Charging System
CSMS Charging Station Management System
EMSP E-Mobility Service Provider
ENP Event Notification Protocol
ENPMsg Event Notification Protocol Message
© ISO #### 2025 – All rights reserved
ESDP Extensible SECC Discovery Protocol
ESDPReq Extensible SECC Discovery Protocol Request
ESDPRes Extensible SECC Discovery Protocol Response
EV electric vehicle
EVCC Electric Vehicle Communication Controller
IPv6 Internet Protocol version 6
MCS Megawatt Charging System
OER Octet Encoding Rules
SDP SECC Discovery Protocol
SDPReq SECC Discovery Protocol Request
SDPRes SECC Discovery Protocol Response
SECC Supply Equipment Communication Controller
TCP Transmission Control Protocol
TLS Transport Layer Security
UDP User Datagram Protocol
5 Conventions
5.1 Provision identifiers
This document uses a provision structure, i.e.,. a unique number identifies each individual provision included
in this document. This provision structure allows for easier provision tracking and test case specification. The
following format is used:
[V2G-] ; where:
— "V2G" represents the ISO 15118 set of standardsseries,
— represents the document part of the ISO 15118 document setseries,
— represents the individual provision number, and
— includes the actual text of the provision.
Please note that a provision can include different types:
— Requirementsrequirements, indicated by “shall””;
— Recommendationsrecommendations, indicated by “should””;
— Permissionspermissions, indicated by “may””.
© ISO #### 2025 – All rights reserved
6 Extensible SECC Discovery Protocol
6.1 General
The ESDP allows both the electric vehicle and the EV supply equipment to detect what the other entity
supports. Based on this information, both entities can decide how to proceed. If they find a common ground,
they can continue with the communication, otherwise they will already know at this point that proceeding
with the communication will not lead to a successful charging session. The information provided in ESDP can
allow manufacturers and operators of EVs and EV supply equipment to reduce unsuccessful charging sessions
in the future.
6.2 Message structure
6.2.1 General
This subclause describes the structure of the messages that are part of the ESDP. Namely, the
ESDPSetupReq/Res message pair and the ESDPReq/Res message pair. Table 1 provides an overview of the
ESDP messages defined in this subclaus
...