ISO 17987-2:2016

DRAFT INTERNATIONAL STANDARD
ISO/DIS 17987-2.2
ISO/TC 22/SC 31 Secretariat: DIN
Voting begins on: Voting terminates on:
2015-10-05 2015-12-05
Road vehicles — Local Interconnect Network (LIN) —
Part 2:
Transport protocol and network layer services
Véhicules routiers — Réseau Internet local (LIN) —
Partie 2: Protocole de transport et couches de services réseau
ICS: 35.240.60; 43.040.15
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ISO/DIS 17987-2.2:2015(E)
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ISO/DIS 17987-2.2:2015(E)
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

ISO/DIS 17987-2.2
Contents Page
1 Scope . 1
2 Normative references . 2
3 Terms, definitions, symbols and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Symbols . 3
3.3 Abbreviated terms . 3
4 Conventions . 4
5 Network management . 4
6 Network layer overview . 8
6.1 General . 8
6.2 Format description of network layer services . 8
6.3 Internal operation of network layer . 9
6.4 Service data unit specification . 9
6.5 Services provided by network layer to higher layers . 12
7 Transport layer protocol . 14
7.1 Protocol functions . 14
7.2 Single frame transmission. 14
7.3 Multiple frame transmission . 14
7.4 Transport layer protocol data units . 16
7.5 Protocol control information specification . 17
7.6 Network layer timing . 20
8 Data link layer usage . 28
8.1 Data link layer service parameters . 28
8.2 Data link layer interface services . 28
8.3 Mapping of the N_PDU fields . 29
8.4 Transport layer PDU structure and communication . 29
9 Diagnostic communication requirements . 32
9.1 Definition of diagnostic classes . 32
9.2 Diagnostic messages . 33
9.3 Using the transport layer . 33
9.4 Slave node diagnostic timing requirements . 34
9.5 Response Pending . 36
9.6 Transport protocol handling in LIN master . 37
9.7 Transmission handler requirements . 43
9.8 Diagnostic service prioritization . 48
10 LIN node capability language (NCL) . 50
10.1 General . 50
10.2 Plug and play workflow concept . 50
11 Node capability file (NCF) . 52
11.1 Overview of NCF syntax . 52
11.2 Global structure definition. 52
11.3 Node definition . 53
11.4 NCF example . 58
12 LIN description file (LDF) . 59
12.1 General . 59
12.2 Overview of LDF syntax . 59
12.3 LDF definition . 59
ISO/DIS 17987-2.2
12.4 LDF example . 74

iv © ISO 2015 – All rights reserved

ISO/DIS 17987-2.2
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 17987-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Electrical and electronic equipment.
ISO 17987 consists of the following parts, under the general title Road vehicles — Local Interconnect Network
(LIN):
 Part 1: General information and use case definition
 Part 2: Transport protocol and network layer services
 Part 3: Protocol specification
 Part 4: Electrical Physical Layer (EPL) specification (12 V/24 V)
 Part 5: Application Programmers Interface (API)
 Part 6: Protocol conformance test specification
 Part 7: Electrical Physical Layer (EPL) conformance test specification
ISO/DIS 17987-2.2
Introduction
This document set specifies the use cases, the communication protocol and physical layer requirements of an
in-vehicle communication network called "Local Interconnect Network (LIN)".
The LIN protocol as proposed is an automotive focused low speed UART-based network (Universal
Asynchronous Receiver Transmitter). Some of the key characteristics of the LIN protocol are signal based
communication, schedule table based frame transfer, master/slave communication with error detection, node
configuration and diagnostic service transportation.
The LIN protocol is for low cost automotive control applications, for example door module and air condition
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;
 Bitrate 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 mode 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 slave nodes;
 Network description file describing behaviour of communication;
 Application programmer's interface;

ISO 17987 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 ISO 17987.
ISO 17987 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.

vi © ISO 2015 – All rights reserved

ISO/DIS 17987-2.2
This document set provides all documents and references required to support the implementation of the
requirements related to.
 Part 1: General information and use case definitions
This part provides an overview of the document set and structure along with the use case definitions and
a common set of resources (definitions, references) for use by all subsequent parts.
 Part 2:
This part specifies the requirements related to the transport protocol and the network layer requirements
to transport the PDU of a message between LIN nodes.
 Part 3:
This part specifies the requirements for implementations of the LIN protocol on the logical level of
abstraction. Hardware related properties are hidden in the defined constraints.
 Part 4:
This part specifies the requirements for implementations of active hardware components which are
necessary to interconnect the protocol implementation.
 Part 5 (published as a non-normative technical report):
This part specifies the LIN API (Application Programmers Interface) and the node co
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