COMPREHENSIBLE GUIDE TO J1939 PDF

SAE J has become the accepted industry standard and the vehicle network technology of choice for off-highway machines in applications such as construction, material handling, and forestry machines. It provides serial data communications between microprocessor systems also called Electronic Control Units - ECU in any kind of heavy duty vehicles. The messages exchanged between these units can be data such as vehicle road speed, torque control message from the transmission to the engine, oil temperature, and many more. It provides profound information on the J message format and network management combined with a high level of readability.

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For the longest time the major misconception about Controller Area Network CAN was that it is merely used in automobiles. The truth is, CAN, since its introduction in , proved to be a robust, simple and versatile technology and, consequently, CAN found its way into all areas of applications where microprocessors need to communicate among each other. CAN proved to be superior to any other field-bus system in regards to low cost, the ability to function in a difficult electrical environment, a high degree of real time capability, excellent error detection and fault confinement capabilities and, almost contradictive to the previously mentioned features, ease of use.

Nowadays there is no special niche for CAN; its use is universal from any industrial application, space and aviation, maritime, medical, down to household appliances such as washers, dryers and even coffee machines. The ease of use is especially evident for the software engineer who is responsible for the development of a CAN based application. As a matter of fact, the actual CAN protocol, i. CAN controllers know per default what to do and how to do it.

This title is also available as a PDF Download. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections or of the United States Copyright Act, without the prior written permission of the Publisher. While the publisher and author have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied warranties or merchantability or fitness for a particular purpose.

No warranty may be created or extended by sales representatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation. You should consult with a professional where appropriate. Neither the publisher nor author shall be liable for any loss or profit or any other commercial damages, including but not limited to special, incidental, consequential, or other damages.

The main reason to write this book was the lack of good printed English literature on CAN basics, which is somewhat disconcerting considering that the technology was first officially introduced in All these documents, more often than not, leave ample room for interpretation of the explained topics by omitting elaborating comments, examples or pictures.

It was surprising to find that some special topics, for instance, the CAN Overload Flag, the Bit Stuffing procedure, Bit Resynchronization, and more, are still insufficiently documented. Other documents did provide interesting details, but were somewhat vague on other topics or, in some rare cases, plain wrong.

Some additional works, originally written in German due to the origination of the technology are hurt by poor translation, which in turn has a damaging effect on the readability. There are also a vast amount of web sites that contain information on CAN, but they mostly provide only bits and pieces and, after all, they all have commercial aspects in mind. The first three chapters provide an overview of Controller Area Network that will allow the reader to understand the basics of CAN without being overwhelmed by technical details:.

Explains in an overview the CAN message frames, bus access, message broadcasting, message priorities, data length and baud rate, bus arbitration and error handling.

Describes the various benefits such as low cost implementation, speed, reliability, error-resistance and worldwide acceptance. The heart of this book is represented, however, by chapters 4 through 9, which provide more detailed technical insights:.

Explains how errors in a CAN network are detected, the determination of sporadic and permanent failures, the fault confinement and error recovery. Explains the CAN bus medium, bus topology, bus level, bus connections and bus length considerations.

This book does not cover part 3 Low-speed, fault-tolerant, medium dependent interface or part 4 Time-triggered communication of the ISO CAN specification, since applications covered by this subject may only apply to automobiles. This book, besides automobile technologies, tries to include industrial automation aspects.

The Society of Automotive Engineers SAE Truck and Bus Control and Communications Subcommittee has developed a family of standards concerning the design and use of devices that transmit electronic signals and control information among vehicle components. Table of Content 1. Overview 1. Main Characteristics 2. Benefits of using CAN 3. Message Frame Architecture 4. About this book The main reason to write this book was the lack of good printed English literature on CAN basics, which is somewhat disconcerting considering that the technology was first officially introduced in Main Characteristics Explains in an overview the CAN message frames, bus access, message broadcasting, message priorities, data length and baud rate, bus arbitration and error handling.

Benefits of using CAN Describes the various benefits such as low cost implementation, speed, reliability, error-resistance and worldwide acceptance. The heart of this book is represented, however, by chapters 4 through 9, which provide more detailed technical insights: Message Frames Explains the detailed architecture of message frames.

Error Detection and Fault Confinement Explains how errors in a CAN network are detected, the determination of sporadic and permanent failures, the fault confinement and error recovery.

Physical Layer Explains the CAN bus medium, bus topology, bus level, bus connections and bus length considerations. Various technical information in this book is based on the International Standard ISO — Road vehicles — Controller area network CAN — Part 1: Data link layer and physical signaling and Part 2: High-speed medium access unit This book does not cover part 3 Low-speed, fault-tolerant, medium dependent interface or part 4 Time-triggered communication of the ISO CAN specification, since applications covered by this subject may only apply to automobiles.

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