SAE J 1939-31-2014 Network Layer.pdf
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1、_ 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 there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J1939/31_201404 SURFACE VEHICLE RECOMMENDED PRACTICE J1939-31 APR2014 Issued 1994
5、-12 Revised 2014-04 Superseding J1939-31 MAY2010 Network Layer RATIONALE This document has been revised with some updates to address some differences between this document and some of the corresponding tests in the SAE J1939-82 document. The references to ISO 11783 within the Foreign Message Transpo
6、rt discussions were removed since ISO 11783 messages are transmitted as standard J1939 messages. FOREWORD The SAE J1939 communications network is defined using a collection of individual SAE J1939 documents based upon the layers of the Open System Interconnect (OSI) model for computer communications
7、 architecture. The SAE J1939-31 Network Layer document defines the OSI Network layer requirements and services that enable electronic control units (ECUs) on one network segment to intercommunicate with other ECUs on different network segments of the vehicle network. The SAE J1939 communications net
8、work is a high speed ISO 11898-1 CAN based communications network that supports real-time closed loop control functions, simple information exchanges, and diagnostic data exchanges between Electronic Control Units (ECUs) physically distributed throughout the vehicle. The SAE J1939 communications net
9、work is developed for use in heavy-duty environments and suitable for horizontally integrated vehicle industries. The SAE J1939 communications network is applicable for light-duty, medium-duty, and heavy-duty vehicles used on-road or off-road, and for appropriate stationary applications which use ve
10、hicle derived components (e.g. generator sets). Vehicles of interest include, but are not limited to, on-highway and off-highway trucks and their trailers, construction equipment, and agricultural equipment and implements. The physical layer aspects of SAE J1939 reflect its design goal for use in he
11、avy-duty environments. Horizontally integrated vehicles involve the integration of different combinations of loose package components, such as engines and transmissions, that are sourced from many different component suppliers. The SAE J1939 common communication architecture strives to offer an open
12、 interconnect system that allows the ECUs associated with different component manufacturers to communicate with each other. SAE INTERNATIONAL J1939-31 Revised APR2014 Page 2 of 35 TABLE OF CONTENTS 1. SCOPE 3 2. REFERENCES 3 2.1 Applicable Documents 3 2.2 Related Publications . 4 3. DEFINITIONS AND
13、ABBREVIATIONS . 4 3.1 Definitions . 4 3.2 Abbreviations 6 4. NETWORK LAYER DESCRIPTION . 6 4.1 General 6 4.2 Reasons for Multiple Networks . 6 4.3 Network Topology . 7 5. NETWORK INTERCONNECTION ECUS . 10 5.1 Types of Network Interconnection ECUs 10 5.2 Message Forwarding Transit Delay Requirements
14、. 13 5.3 NIECU Conformance (Minimum Requirements) . 13 5.4 NIECU Suitability Criteria 14 6. NETWORK INTERCONNECTION FUNCTIONS . 14 6.1 Message Forwarding . 14 6.2 Message Filtering 14 6.3 Address Translation 15 6.4 Protocol Translation 15 6.5 Database Management . 15 6.6 Tunneling (Foreign Message T
15、ransport) . 16 7. NETWORK INTERCONNECTION ECU DATABASE MANAGEMENT MESSAGE . 19 7.1 General Network Message Requirements 19 7.2 Network Message Definition . 19 7.3 Message Filter Database Services (N.MFDB) 20 7.4 Network Topology Information Services (N.NT) . 23 7.5 NIECU General Parametric Data Serv
16、ices (N.GP) . 25 7.6 NIECU Specific Port Pair Parametric Data Services (N.SP) 26 7.7 Network Message Data Definitions . 28 8. NOTES 32 8.1 Marginal Indicia . 32 APPENDIX A STATUS AND STATISTICS PARAMETER DEFINITIONS 33 FIGURE 1 TYPICAL SAE J1939 VEHICLE NETWORK FOR TRUCK AND BUS . 8 FIGURE 2 TYPICAL
17、 SAE J1939 VEHICLE NETWORK FOR AGRICULTURAL APPLICATIONS . 9 FIGURE 3 FOREIGN MESSAGE TRANSPORT EXAMPLE 1 - LOGICAL MODEL 17 FIGURE 4 FOREIGN MESSAGE TRANSPORT EXAMPLE 1 - MESSAGING SEQUENCE 17 FIGURE 5 FOREIGN MESSAGE TRANSPORT EXAMPLE 2 18 FIGURE 6 FOREIGN MESSAGE TRANSPORT EXAMPLE 3 18 FIGURE 7 N
18、ETWORK MESSAGE (PGN 60672) DEFINITION . 20 FIGURE 8 EXAMPLE OF MESSAGE FILTER DATABASE ACCESS . 21 TABLE 1 NETWORK MESSAGE CONTROL BYTE VALUES 28 TABLE 2 PORT NUMBER ASSIGNMENTS 29 TABLE 3 FILTER MODE VALUES . 30 TABLE 4 NIECU STATUS AND STATISTICS PARAMETER NUMBERS. 31 TABLE A1 NIECU TYPE ASSIGNMEN
19、TS . 35 SAE INTERNATIONAL J1939-31 Revised APR2014 Page 3 of 35 1. SCOPE SAE J1939-31 Network Layer describes the requirements and services for Network Interconnection ECUs (NIECU) that enable electronic control units (ECUs) on a network segment to intercommunicate with other ECUs on different netwo
20、rk segments of the vehicle network. This document defines various types of NIECUs. The information in this document applies only to ECUs that are intended to provide networking services. It is not necessary for an ECU to provide any of these services in order to be compliant with the SAE J1939 proto
21、col. 2. REFERENCES 2.1 Applicable Documents General information regarding this series of documents is found in SAE J1939. The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 S
22、AE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J1587 Electronic Data Interchange Between Microcomputer Systems in Heavy-Duty Vehicle Applications SAE J1922
23、Powertrain Control Interface for Electronic Controls Used in Medium- and Heavy-Duty Diesel On-Highway Vehicle Applications SAE J1939 Recommended Practice for a Serial Control and Communications Vehicle Network SAE J1939-21 Data Link Layer SAE J1939-71 Vehicle Application Layer SAE J1939-81 Network M
24、anagement 2.1.2 ISO Publications Available from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ISO 11783 Tractors and Machinery for Agriculture and Forestry Serial Control and Communications Data Network ISO 11898-1 Road vehicles
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