ISO 15765-4:2021 道路車両—コントローラーエリアネットワーク（DoCAN）を介した診断通信—パート4：排出量関連システムの要件 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31, Data communication.

This fourth edition cancels and replaces the third edition (ISO 15765-4:2016), which has been technically revised.

The main changes compared to the previous edition are as follows:

• changed all time-related parameters to t_{Parameter_Name};
• corrected all occurrences of ⊣⫤ P2_{CAN_max} and changed to Δt_{P2_CAN_Client_Max};
• Clause 6 title has been changed to application;
• subclause 6.1 title has been changed to vehicle communication initialisation sequence;
• subclause 6.2 title has been changed to external test equipment communication initialisation sequence;
• changed N_As to t_{N_As} and changed timeout value to 33 ms;
• changed N_Ar to t_{N_Ar} and changed timeout value to 33 ms;
• added clarification in 10.3.3 regarding the acceptance of physically addressed request messages.

A list of all parts in the ISO 15765 series can be found on the ISO website.

Introduction

This document has been established in order to define common requirements for vehicle diagnostic systems implemented on a controller area network (CAN) communication link, as specified in ISO 11898-1 and ISO 11898-2. Although primarily intended for diagnostic systems, it also meets requirements from other CAN-based systems needing a network layer protocol.

To achieve this, it is based on the Open Systems Interconnection (OSI) basic reference model specified in ISO/IEC 7498-1 and ISO/IEC 10731, which structures communication systems into seven layers.

When mapped on this model, the application protocol and lower OSI layers framework requirements specified/referenced in the ISO 15765 series are structured according to Figure 1.

Figure 1 illustrates a standards-based documentation concept, which consists of the lower OSI layers framework, which specifies requirements related to the transport layer, network layer, data link layer and physical layer standards of the OSI layers 4, 3, 2, and 1.

1 Scope

This document specifies requirements for CAN-based communication systems between the in-vehicle network and the diagnostic link connector of the vehicle. This document does not specify any requirements related to the in-vehicle CAN network architecture. This document specifies the requirements to enable the in-vehicle CAN-based communication systems to establish, maintain, and terminate communication with the devices connected to the diagnostic link connector.

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.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/IEC 7498-1, ISO 11898-1, ISO 11898-2, ISO 15765-2 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography