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Vehicle Multiplex Communication Serial Data Networking Applied to Vehicular Engineering

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Vehicle Multiplex Communication Serial Data Networking Applied to Vehicular Engineering 2004 Edition, May 28, 2004
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Description / Abstract: Overview

This text is an introductory overview of vehicle multiplexing. The intended audience is engineers and managers working in the field of automotive and other vehicular electronics. The content for this book was developed from a three-day class on in-vehicle networking that has been taught in the public sector since 1993. A series of classes covering this material, and much more, are available now through Dearborn Group Technology, Inc. (www.dgtech.com).

Multiplexing, or in-vehicle networking, is one of the most popular areas of vehicle electronics currently. All vehicle original equipment manufacturers (OEMs), electronic control unit (ECU) suppliers, and integrated circuit (IC) vendors to the automotive industry are working on multiplex products. Multiplexing is the technology of applying serial data communications to the electric/electronic functions of a vehicle.

Multiplexing can be best discussed at three levels: the vehicle level, the ECU or component level, and the IC level. Within each level are partitions for software and hardware, and within each partition are divisions of functionality such as buffer size.

The following chapters will help the reader to acquire a basic understanding of vehicle multiplexing systems primarily from the viewpoint of the passenger car and light truck. Some discussion of heavy-duty and off-road vehicle multiplexing will be presented, as will be a look at industrial automation—a fastgrowing multiplex field already eclipsing automotive usage. Hereafter, "automotive" will be used interchangeably with "vehicle."

Hardware and software issues will be presented for the more common protocols available. This survey should enable the reader to understand how multiplexing is generally done, so new protocols should present no difficulty as they arise. Much like software languages, all multiplex protocols have many things in common, and new schemes are simple to learn, once one or more are mastered.

Although this is an introductory and background text, information is presented on important technical issues such as electromagnetic compatibility (EMC). Within this realm, problems with electrostatic discharge (ESD), radiated emissions, and radiated immunity are important topics.

It is assumed that the reader has education and/or experience in electrical engineering. Some background in microcomputer operation and programming is also helpful. Basic techniques of binary/hexadecimal data conversion and computer architectures will not be presented.