DBC_File_Format_Documentation

Vector 公司的 DBC 文件格式说明。这类DBC文件可以作为整车CAN网络的描述文件,可以描述各个CAN message(包括ID、传递参数的物理含义等)。

DBC File Format Documentation DBC File Format

Documentation

Version 01/2007

This specification as released by Vector is intended for the purpose of

information only and is provided on an "AS IS" basis only. To the extent

admissible by law, Vector disclaims any warranties or liabilities from the

use of this specification. The unauthorized use, e.g. copying, displaying

or other use of any content from this document is a violation of the law

and intellectual property rights. You must not distribute this specification

to anyone outside of the department or the project for which your com-

pany has received this specification, and in particular the distribution

outside your company is expressly inadmissible.

© 2007 Vector Informatik GmbH

All rights reserved. I

Vector 公司的 DBC 文件格式说明。这类DBC文件可以作为整车CAN网络的描述文件,可以描述各个CAN message(包括ID、传递参数的物理含义等)。

DBC File Format Documentation II

Document Management Revision History

Version Editor Description

Specification created 1.0 of 2007-02-09 Qu

Table of contents

1 Introduction..................................................................................................................1

2 General Definitions......................................................................................................1

3 Structure of the DBC File.............................................................................................2

4 Version and New Symbol Specification......................................................................3

5 Bit Timing Definition....................................................................................................3

6 Node Definitions...........................................................................................................3

7 Value Table Definitions................................................................................................3

7.1 Value Descriptions (Value Encodings).................................................................................4

8 Message Definitions.....................................................................................................4

8.1 Signal Definitions..................................................................................................................4

8.2 Definition of Message Transmitters......................................................................................6

8.3 Signal Value Descriptions (Value Encodings)......................................................................6

9 Environment Variable Definitions...............................................................................6

9.1 Environment Variable Value Descriptions............................................................................7 10

11

12 Signal Type and Signal Group Definitions.........................................................7 Comment Definitions...........................................................................................7 User Defined Attribute Definitions......................................................................8

12.1 Attribute Definitions..............................................................................................................8

12.2 Attribute Values....................................................................................................................8 13

Examples..............................................................................................................8

Vector 公司的 DBC 文件格式说明。这类DBC文件可以作为整车CAN网络的描述文件,可以描述各个CAN message(包括ID、传递参数的物理含义等)。

DBC File Format Documentation Version 01/2007 1

1 Introduction

The DBC file describes the communication of a single CAN network. This informa-tion is sufficient to monitor and analyze the network and to simulate nodes not physically available (remaining bus simulation).

The DBC file can also be used to develop the communication software of an elec-tronic control unit which shall be part of the CAN network. The functional behavior of the ECU is not addressed by the DBC file.

2 General Definitions

The following general elements are used in this documentation:

unsigned_integer: an unsigned integer

signed_integer: a signed integer

double: a double precision float number

char_string: an arbitrary string consisting of any printable charac-

ters except double hyphens ('"').

C_identifier: a valid C_identifier. C_identifiers have to start with

am alpha character or an underscore and may further consist of

alpha-numeric characters and underscores.

C_identifier = (alpha_char | '_') {alpha_num_char | '_'}

C-identifiers used in DBC files may have a length of up to 128 characters. To be compatible to older tools the length should not exceed 32 characters.

Other strings used in DBC files may be of an arbitrary length.

The keywords used in DBC files o identify the type of an object are given in the following table: Keyword

BU_

BO_

SG_

EV_ Object Type Network Node Message Signal Environment Variable

The syntax is described using the extended BNF notation (Backus-Naur-Format). Symbol

=

;

| Meaning A name on the left of the = is defined using the syntax on the right (syntax rule). The semicolon terminates a definition. The vertical bar indicates an alternative.

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