National foreword

This British Standard is the UK implementation of ISO 11898‑1:2015.

The UK participation in its preparation was entrusted to Technical Committee AUE/16, Data Communication (Road Vehicles).

A list of organizations represented on this committee can be obtained on request to its secretary.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2016.

Foreword

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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).

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The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 31, Data communication.

This second edition cancels and replaces the first edition (ISO 11898‑1:2003), which has been technically revised. It also incorporates the Corrigendum ISO 11898‑1:2003/Cor 1:2006.

ISO 11898 consists of the following parts, under the general title Road vehicles - Controller area network (CAN):

Part 1: Data link layer and physical signalling
Part 2: High-speed medium access unit1)
Part 3: Low-speed, fault-tolerant, medium-dependent interface
Part 4: Time-triggered communication
Part 5: High-speed medium access unit with low-power mode1)
Part 6: High-speed medium access unit with selective wake-up functionality1)

Introduction

ISO 11898 was first published as one document in 1993. It covered the CAN data link layer, as well as the high-speed physical layer.

In the reviewed and restructured ISO 11898 series:

Part 1 defines the data link layer including the logical link control (LLC) sub-layer and the medium access control (MAC) sub-layer, as well as the physical signalling (PHS) sub-layer;
Part 2 defines the high-speed physical medium attachment (PMA);
Part 3 defines the low-speed fault-tolerant physical medium attachment (PMA);
Part 4 defines the time-triggered communication;
Part 5 defines the power modes of the high-speed physical medium attachment (PMA);
Part 6 defines the selective wake-up functionality of the high-speed physical medium attachment (PMA).

NOTE ISO 11898‑2 is updated in parallel to the update of this part of ISO 11898 to combine the functions described in ISO 11898‑2, ISO 11898‑5 and ISO 11898‑6. (The future edition of ISO 11898‑2 will cancel and replace the current ISO 11898‑2:2003, ISO 11898‑5:2007 and ISO 11898‑6:2013)

Figure 1 shows the relations between the OSI reference layers and the parts of the ISO 11898 series.

1 Scope

This part of ISO 11898 specifies the characteristics of setting up an interchange of digital information between modules implementing the CAN data link layer. Controller area network is a serial communication protocol, which supports distributed real-time control and multiplexing for use within road vehicles and other control applications.

This part of ISO 11898 specifies the Classical CAN frame format and the newly introduced CAN Flexible Data Rate Frame format. The Classical CAN frame format allows bit rates up to 1 Mbit/s and payloads up to 8 byte per frame. The Flexible Data Rate frame format allows bit rates higher than 1 Mbit/s and payloads longer than 8 byte per frame.

This part of ISO 11898 describes the general architecture of CAN in terms of hierarchical layers according to the ISO reference model for open systems interconnection (OSI) according to ISO/IEC 7498‑1. The CAN data link layer is specified according to ISO/IEC 8802‑2 and ISO/IEC 8802‑3.

This part of ISO 11898 contains detailed specifications of the following (see Figure 2):

logical link control sub-layer;
medium access control sub-layer;
physical coding sub-layer.

There are three implementation options. They are the following:

support of the Classical CAN frame format only, not tolerating the Flexible Data Rate frame format;
support of the Classical CAN frame format and tolerating the Flexible Data Rate frame format;
support of the Classical CAN frame format and the Flexible Data Rate frame format.

The last option is recommended to be implemented for new designs.

NOTE Implementations of the first option can communicate with implementations of the third option only as long as the Flexible Data Rate frame format is not used; otherwise, Error Frames are generated. There are opportunities to run implementations of the first option also in CAN networks using the Flexible Data Rate frame format, but these are not in the scope of this part of ISO 11898.

2 Conformance

3 Normative references

4 Terms and definitions

5 Symbols and abbreviated terms

6 Basic concepts of CAN

6.1 CAN properties

6.2 Frames

6.3 Bus access method

6.4 Information routing

6.5 Network flexibility

6.6 Data consistency

6.7 Remote data request

6.8 Error detection

6.9 Error signalling and recovery time

6.10 ACK

6.11 Automatic retransmission

6.12 Fault confinement

6.13 Error-active

6.14 Error-passive

6.15 Bus-off

7 Layered architecture of CAN

7.1 Reference to OSI model

7.2 Protocol specification

7.3 Format description of services

7.4 LLC interface

8 Description of LLC sub-layer

8.1 General

8.2 Services of LLC sub-layer

8.3 Functions of LLC sub-layer

8.4 Structure of LLC frames

8.5 Limited LLC frames

9 Interface between LLC and MAC

9.1 Services

9.2 Time and time triggering

9.3 Disabling automatic retransmission

9.4 Message time stamping

10 Description of MAC sub-layer

10.1 General

10.2 Services of MAC sub-layer

10.3 Functional model of MAC sub-layer architecture

10.4 Structure of MAC frames

10.5 Frame coding

10.6 Frame acknowledgement

10.7 Frame validation

10.8 Order of bit transmission

10.9 Medium access method

10.10 MAC data consistency

10.11 Error detection

10.12 Error signalling

10.13 Overload signalling

10.14 Bus monitoring

10.15 Restricted operation

11 PL specification

11.1 General and functional modelling

11.2 Services of PL

11.3 PCS specification

11.4 AUI specification

12 Description of supervisor FCE

12.1 Fault confinement

12.2 Bus failure management

Bibliography

BS ISO 11898-1:2015

Road vehicles. Controller area network (CAN) - Data link layer and physical signalling

Published:

31 Jan 2016

Withdrawn:

30 May 2024