SAE1939标准资源-CSDN文库

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SURFACE

VEHICLE

RECOMMENDED

PRACTICE

Vehicle Application Layer (through December 2004)

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is

entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”

SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.

recording, or otherwise, without the prior written permission of SAE.

TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)

Tel: 724-776-4970 (outside USA)

Fax: 724-776-0790

Email: CustomerService@sae.org

SAE WEB ADDRESS: http://www.sae.org

Issued 1994-08

Revised 2006-06

Superseding

J1939-71 DEC2004

REV.

J1939-71 JUN2006

Foreword

This series of SAE Recommended Practices has been developed by the Truck and Bus Control and

Communications Network Subcommittee of the Truck and Bus Electrical and Electronics Committee. The

objectives of the subcommittee are to develop information reports, recommended practices, and standards

concerned with the requirements design and usage of devices that transmit electronic signals and control

information among vehicle components. The usage of these documents is not limited to truck and bus

applications; other applications may be accommodated with immediate support being provided for

construction and agricultural equipment, and stationary power systems. These documents are intended as

a guide toward standard practice and are subject to change so as to keep pace with experience and

technical advances.

SAE J1939-71 REVISED JUN2006 - 3 -

See SAE J1939 for additional abbreviations that may be used in this document.

5. Technical Requirements

The Application Layer provides a means for application processes to access the OSI environment. This

layer contains management functions and generally useful mechanisms to support applications.

5.1 General Guidelines

5.1.1 S

IGNAL CHARACTERIZATION

It is the intent of the SAE J1939 network to provide current data and signals from a source so that it may

be used by other nodes. It is recommended that the time between physical data acquisition of a signal

and the transmission of the data should not exceed two times the repetition rate defined for the data.

Additional constraints may be defined for certain parameters (see also 5.1.7.2).

5.1.2 M

ESSAGE FORMAT

The message format of SAE J1939 uses the parameter group number as the label for a group of

parameters. Each of the parameters within the group can be expressed in ASCII, as scaled data defined

by the ranges described in 5.1.4, or as function states consisting of two or more bits. Alphanumeric data

will be transmitted with the most significant byte first. Unless otherwise specified, alphanumeric

characters will conform to the ISO Latin 1 ASCII character set as shown in section 5.1.3. Other

parameters consisting of 2 or more data bytes shall be transmitted least significant byte first.

The type of data shall also be identified for each parameter. Data may be either status or measured.

Status specifies the present state of a multi-state parameter or function as a result of action taken by the

transmitting node. This action is the result of a calculation which uses local and/or network “measured”

and/or “status” information. Note that specific confirmation of this action is not necessarily assured. For

instance, the status may indicate that a solenoid has been activated, yet no measurement may have been

taken to ensure the solenoid accomplished its function. Examples of status-type data are: engine brakes

are enabled, PTO speed control is active, cruise control is active, the cruise control is in the “set” state of

operation (as opposed to a measured indication that the “set” switch contacts are closed), fault codes,

torque/speed control override modes, desired speed/speed limit, engine torque mode, engine's desired

operating speed, engine's operating speed asymmetry adjustment, etc.

Measured data conveys the current value of a parameter as measured or observed by the transmitting

node to determine the condition of the defined parameter. Examples of measured-type data are: boost

pressure, ignition on/off, cruise set switch activated, maximum cruise speed, cruise set speed, engine

speed, percent load at current speed, etc.

SAE J1939-71 REVISED JUN2006 - 4 -

5.1.3 ISO LATIN 1 CHARACTER SET

Horizontal boldface characters are the single hexidecimal digit representing the lower nibble of the single

byte code for the character. Vertical boldface characters are the single hexidecimal digit representing the

upper nibble of the single byte code for the character.

0 1 2 3 4 5 6 7 8 9 A B C D E F

0 --------------------- should not be displayed ------------------------

1 --------------------- should not be displayed ------------------------

space ! " # $ % & ' ( ) * + , - . /

3 0 1 2 3 4 5 6 7 8 9 : ; < = > ?

4 @ A B C D E F G H I J K L M N O

5 P Q R S T U V W X Y Z [ \ ] ^ _

6 ` a b c d e f g h i j k l m n o

7 p q r s t u v w x y z { | } ~ nil

8 --------------------- should not be displayed ------------------------

9 --------------------- should not be displayed ------------------------

B  ± ² ³ ´  ¶ · ¸ ¹ º » ¼ ½ ¾ ¿

C À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï

D Ð Ñ Ò Ó Ô Õ Ö  Ø Ù Ú Û Ü Ý Þ ß

E à á â ã ä å æ ç è é ê ë ì í î ï

F ð ñ ò ó ô õ ö  ø ù ú û ü ý þ ÿ

5.1.4 P

ARAMETER RANGES

Table 1 defines the ranges used to determine the validity of a transmitted signal. Table 2 defines the

ranges used to denote the state of a discrete parameter and Table 3 defines the ranges used to denote

the state of a control mode command. The values in the range “error indicator” provide a means for a

module to immediately indicate that valid parametric data is not currently available due to some type of

error in the sensor, sub-system, or module.

The values in the range “not available” provide a means for a module to transmit a message which

contains a parameter that is not available or not supported in that module. The values in the range “not

requested” provide a means for a device to transmit a command message and identify those parameters

where no response is expected from the receiving device.

If a component failure prevents the transmission of valid data for a parameter, the error indicator as

described in Tables 1 and 2 should be used in place of that parameter’s data. However, if the measured

or calculated data has yielded a value that is valid yet exceeds the defined parameter range, the error

indicator should not be used. The data should be transmitted using the appropriate minimum or

maximum parameter value.

5.1.5 A

SSIGNMENT OF RANGES TO NEW PARAMETERS

This section is intended to define a set of recommended SLOTs (Scaling, Limit, Offset, and Transfer

Function) which can be used when parameters are added to J1939. This permits data consistency to be

maintained as much as possible between parameters of a given type (temperature, pressure, speed,

etc.). Each SLOT is intended to provide a range and resolution suitable for most parameters within a

given type. When necessary, a different scaling factor or offset can be used. All SLOTs should be based

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2019-12-25

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