ISO 17987-1:2025
(Main)Road vehicles — Local Interconnect Network (LIN) — Part 1: General information and use case definition
Road vehicles — Local Interconnect Network (LIN) — Part 1: General information and use case definition
This document gives an overview of the structure and the partitioning of the ISO 17987 series. In addition, it outlines the use cases where the ISO 17987 series is used. The terminology defined in this document is common for all LIN communication systems and is used throughout the ISO 17987 series. This document has been established to define the use cases for LIN.
Véhicules routiers — Réseau Internet local (LIN) — Partie 1: Information générale et définition des cas d'usage
General Information
Relations
Standards Content (Sample)
International
Standard
ISO 17987-1
Second edition
Road vehicles — Local Interconnect
2025-05
Network (LIN) —
Part 1:
General information and use case
definition
Véhicules routiers — Réseau Internet local (LIN) —
Partie 1: Information générale et définition des cas d'usage
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Conventions . 2
6 Use case overview and principles . 3
6.1 Basic principles for use case definition .3
6.2 Use case clusters .3
7 LIN communications system use case definition . 3
7.1 UC 1 Commander task cluster .3
7.1.1 UC 1.1 Generate LIN frame header .3
7.2 UC 2 Responder task cluster .4
7.2.1 UC 2.1 Break/sync byte field sequence detector .4
7.2.2 UC 2.2 LIN frame processor .4
7.2.3 UC 2.3 Responder node configuration .4
7.2.4 UC 2.4 Responder error status reporting .5
7.2.5 UC 2.5 Diagnostic responder node capabilities.5
7.3 UC 3 LIN communication protocol cluster .6
7.3.1 UC 3.1 Synchronization.6
7.3.2 UC 3.2 Checksum .6
7.3.3 UC 3.3 Responder bit rate detection .6
7.4 UC 4 LIN physical layer cluster .7
7.4.1 UC 4.1 Performance in non-operation supply voltage range .7
7.4.2 UC 4.2 Loss of supply voltage .7
7.5 UC 5 LIN network management .7
7.5.1 UC 5.1 LIN cluster network management .7
Bibliography . 8
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 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.
This second edition cancels and replaces the first edition (ISO 17987-1:2016), which has been technically
revised.
The main changes are as follows:
— master and slave terms used for the LIN node types in the ISO 17987:2016 series are replaced within this
document with inclusive language terms commander and responder. This also applies for abbreviations
and file formats NCF and LDF;
— editorial updates.
A list of all parts in the ISO 17987 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.
iv
Introduction
The LIN protocol as proposed is an automotive focused low speed universal asynchronous receiver
transmitter (UART) based network. Some of the key characteristics of the LIN protocol are signal-based
communication, schedule table-based frame transfer, commander/responder communication with error
detection, node configuration and diagnostic service transportation.
The LIN protocol is for low-cost automotive control applications as, for example, door module and air
conditioning systems. It serves as a communication infrastructure for low-speed control applications in
vehicles by providing:
— signal-based communication to exchange information between applications in different nodes;
— bit rate support from 1 kbit/s to 20 kbit/s;
— deterministic schedule-table-based frame communication;
— network management that wakes up and puts the LIN cluster into sleep state in a controlled manner;
— status management that provides error handling and error signalling;
— transport layer that allows large amount of data to be transported (such as diagnostic services);
— specification of how to handle diagnostic services;
— electrical physical layer specifications;
— node description language describing properties of responder nodes;
— network description file describing behaviour of communication;
— application programming interface.
The ISO 17987 series is based on the open systems interconnection (OSI) basic reference model as specified
in ISO/IEC 7498-1 which structures communication systems into seven layers.
The OSI model structures data communication into seven layers called (top down) application layer (layer 7),
presentation layer, session layer, transport layer, network layer, data link layer and physical layer (layer 1). A
subset of these layers is used in the ISO 17987 series.
The ISO 17987 series distinguishes between the services provided by a layer to the layer above it and the
protocol used by the layer to send a message between the peer entities of that layer. The reason for this
distinction is to make the services, especially the application layer services and the transport layer services,
reusable also for other types of networks than LIN. In this way, the protocol is hidden from the service user
and it is possible to change the protocol if special system requirements demand it.
The ISO 17987 series provides all documents and references required to support the implementation of the
requirements related to the following.
— ISO 17987-1 (this document): provides an overview of the ISO 17987 series and structure along with the
use case definitions and a common set of resources (definitions, references) for use by all subsequent parts.
— ISO 17987-2: specifies the requirements related to the transport protocol and the network layer
requirements to transport the PDU of a message between LIN nodes.
— ISO 17987-3: specifies the requirements for implementations of the LIN protocol on the logical level of
abstraction. Hardware-related properties are hidden in the defined constraints.
— ISO 17987-4: specifies the requirements for implementations of active hardware components which are
necessary to interconnect the protocol implementation.
v
— ISO/TR 17987-5: specifies the LIN application programming interface (API) and the node configuration
and identification services. The node configuration and identification services are specified in the API
and define how a responder node is configured and how a responder node uses the identification service.
— ISO 17987-6: specifies tests to check the conformance of the LIN protocol implementation according
to ISO 17987-2 and ISO 17987-3. This comprises tests for the data link layer, the network layer and the
transport layer.
— ISO 17987-7: specifies tests to check the conformance of the LIN electrical physical layer implementation
(logical level of abstraction) according to ISO 17987-4.
vi
International Standard ISO 17987-1:2025(en)
Road vehicles — Local Interconnect Network (LIN) —
Part 1:
General information and use case definition
1 Scope
This document gives an overview of the structure and the partitioning of the ISO 17987 series. In addition,
it outlines the use cases where the ISO 17987 series is used. The terminology defined in this document is
common for all LIN communication systems and is used throughout the ISO 17987 series.
This document has been established to define the use cases for LIN.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
...
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