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 2012 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/J1939/1_201211SURFACE VEHICLE RECOMMENDED PRACTICE J1939-1 NOV2012 Issued 2000-09
5、 Revised 2012-11 Superseding J1939-1 MAY2011 On-Highway Equipment Control and Communication Network RATIONALE This document has been updated to include reference to J1939-14, 500K Bits/sec. FOREWORD The set of SAE J1939 Recommended Practices documents define a highspeed CAN-based communications netw
6、ork that can support real-time closed loop control functions, simple information exchanges, and diagnostic data exchanges between Electronic Control Units (ECUs) physically distributed throughout the vehicle. SAE J1939 network is the next generation successor to the SAE J1708 and SAE J1587 low speed
7、 networks. SAE J1708 and SAE J1587 are older, widely used networks intended to provide simple information exchange, including diagnostic data, between ECUs. SAE J1939 is capable of performing all of the functions of SAE J1708 and SAE J1587 networks as well as providing control system support. The SA
8、E J1939 communications network is suitable for use in heavy-duty environments and suitable for use in vertically integrated vehicle industries. The physical layer aspects of SAE J1939 reflect its design goal for use in heavy-duty environments. Vertically integrated vehicles involve the integration o
9、f different combinations of loose package components, such as engines and transmissions that are sourced from many different component suppliers. SAE J1939 common communication architecture strives to offer an open interconnect system that allows the ECUs associated with different component manufact
10、urers to communicate with each other. The SAE J1939 communications network is intended for light-duty, medium-duty, and heavy-duty vehicles used on-road or off-road, and for appropriate stationary applications which use vehicle derived components (e.g., generator sets). Vehicles of interest include,
11、 but are not limited to, on-highway and off-highway trucks and their trailers, construction equipment, and agricultural equipment and implements. The series of SAE J1939 documents has been developed by the SAE Truck and Bus Control and Communications Network Committee of the SAE Truck and Bus Electr
12、ical and Electronics Steering Committee. These documents are intended as a guide toward standard practice and are subject to change to keep pace with experience and technical advances. SAE J1939-1 Revised NOV2012 Page 2 of 8 TABLE OF CONTENTS 1. SCOPE 3 1.1 Purpose . 3 1.2 Degrees of Openness . 3 2.
13、 REFERENCES 3 2.1 Applicable Documents 3 2.1.1 SAE Publications . 3 2.2 Related Publications . 4 2.2.1 SAE Publications . 4 2.3 ISO Publications 4 3. DEFINITIONS AND ABBREVIATIONS . 4 3.1 Definitions . 4 3.1.1 Bridge 4 3.1.2 Diagnostic Connector 4 3.1.3 Network integrator . 4 4. TECHNICAL REQUIREMEN
14、TS 5 4.1 Use of SAE J1939 Documents . 5 4.2 Physical Layer Definition . 5 4.2.1 Signal Definition 5 4.2.2 Media 6 4.2.3 Topology . 6 4.2.4 Diagnostic Connector 6 4.3 Data Link Layer Definition . 6 4.4 Network Layer Definition . 6 4.5 Application Layer . 6 4.6 On Board Diagnostics (OBD) Consideration
15、s 6 4.7 Network Management Considerations 7 4.8 Use of Subnetworks 7 5. NOTES 8 5.1 Marginal Indicia . 8 FIGURE 1 EXAMPLE OF VEHICLE NETWORK USING SINGLE NETWORK . 7 FIGURE 2 EXAMPLE OF VEHICLE NETWORK USING MULTIPLE SUBNETWORKS 7 FIGURE 3 EXAMPLE OF A POSSIBLE ON-HIGHWAY TRUCK IMPLEMENTATION . 8 SA
16、E J1939-1 Revised NOV2012 Page 3 of 8 1. SCOPE SAE J1939-1 On-Highway Equipment Control and Communication Network specifies the minimum set of SAE J1939 documents that define the Truck and Bus Control and Communications Vehicle Network as it applies to on-highway equipment. Vehicles covered include
17、all on-highway straight trucks and road trains. A road train consists of one towing vehicle (tractor) and one or more towed vehicles (trailers and dollies). Dolly axles within the road train are considered to be towed vehicles. 1.1 Purpose It is the intention of the SAE J1939 family of recommended p
18、ractices to allow electronic devices to communicate with each other by providing a standard architecture. SAE J1939-1 describes the particular set of SAE J1939 documents used to implement an open interconnect system for electronic systems in a heavy-duty on-highway vehicle. Vehicles covered include
19、on-highway straight trucks and combination vehicles. A combination vehicle consists of one towing vehicle (tractor), and one or more towed vehicle(s) (trailers and dollies). Dolly axles within the combination vehicle are considered to be towed vehicles. 1.2 Degrees of Openness A network based upon t
20、his document is open to the degree that any two devices which conform to SAE J1939-1 can be connected via the network and communicate with each other without functional interference. Devices that conform to different SAE J1939-0x documents may not be capable of communicating directly with one anothe
21、r and in some cases may cause degradation or complete disruption of the entire network. 2. REFERENCES 2.1 Applicable Documents 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.
22、1.1 SAE Publications Available from SAE, 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 J1939 Serial Control and Communications Heavy Duty Vehicle Network - Top Level Document SAE J1939-3 On Board Diagnosti
23、cs Implementation Guide SAE J1939-11 Physical Layer, 250K bits/s, Twisted Shielded Pair SAE J1939-13 Off-Board Diagnostic Connector SAE J1939-14 Physical Layer, 500K Bits/s SAE J1939-15 Reduced Physical Layer, 250K bits/s, UN-Shielded Twisted Pair (UTP) SAE J1939-21 Data Link Layer SAE J1939-31 Netw
24、ork Layer SAE J1939-1 Revised NOV2012 Page 4 of 8 SAE J1939-71 Vehicle Application Layer SAE J1939-73 Application Layer - Diagnostics SAE J1939-81 Network Management 2.2 Related Publications The following publications are provided for information purposes only and are not a required part of this SAE
25、 Technical Report. 2.2.1 SAE Publications Available from SAE, 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 Application
26、s SAE J1708 Serial Data Communications Between Microcomputer Systems in Heavy-Duty Vehicle Applications 2.3 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 7498 Information Processing Systems Op
27、en Systems Interconnection (OSI) Basic Reference Model ISO 11898 Road Vehicles-Interchange of digital information-Controller area network (CAN) for high-speed communications ISO 11992 Interchange of Digital Information on Electrical Connections Between Towing and Towed Vehicle 3. DEFINITIONS AND ABB
28、REVIATIONS 3.1 DEFINITIONS 3.1.1 Bridge A device which stores and forwards messages between two SAE J1939 network segments. 3.1.2 Diagnostic Connector A connector on the vehicle that is used to get access to the vehicle communications network. 3.1.3 Network integrator The person, company or entity t
29、hat manages the overall integration of ECUs into a complete vehicle network. SAE J1939-1 Revised NOV2012 Page 5 of 8 4. TECHNICAL REQUIREMENTS 4.1 Use of SAE J1939 Documents Vehicle networks described by the SAE J1939 family of documents follow the 7 layer OSI network architecture with a different d
30、ocument describing each layer used (not all 7 layers are used). The SAE J1939-1 on-highway equipment network makes use of the following SAE J1939 related documents: SAE J1939 This top-level document describes the network in general, the OSI layering structure, the subordinate document structure, and
31、 provides control for all preassigned values and names. SAE J1939-03 On Board Diagnostics Implementation Guide. Describes the implementation of On Board Diagnostics as may be applicable to heavy duty on-highway diesel trucks, which utilize the SAE J1939 network. SAE J1939-11 Physical Layer 250K Bits
32、/s, Shielded Twisted Pair. Used on the tractor and as a subnetwork on trailers. SAE J1939-13 Off-Board Diagnostic Connector. Used to access the network with external devices such as diagnostic tools. SAE J1939-14 Physical Layer 500K Bits/s. Used on the tractor and as a subnetwork on trailers. SAE J1
33、939-15 Reduced Physical Layer 250K Bits/s, Unshielded Twisted Pair. Used on the tractor and as a subnetwork on trailers. SAE J1939-21 Data Link Layer SAE J1939-31 Network Layer SAE J1939-71 Vehicle Application Layer. Provides the definition of data elements and messages for vehicle functionality. SA
34、E J1939-73 Application Layer - Diagnostics. Provides the definition of data elements and messages used for diagnostics and related network support functions. SAE J1939-81 Network Management. Provides definition of handling source addresses and device identities. 4.2 Physical Layer Definition SAE J19
35、39-11, SAE J1939-14, and SAE J1939-15 define physical layer implementations of the ISO 11898 Controller Area Network (CAN) specification that may be used for heavy-duty on-highway vehicle applications. The network integrator shall use either SAE J1939-11, SAE J1939-14, or SAE J1939-15 for the SAE J1
36、939-1 implementation. Any single segment of the vehicle network shall use only one of these physical layers. Network topology requirements in SAE J1939-11 are relaxed in SAE J1939-15 to provide additional design flexibility to the OEM in the placement of network termination devices and for the use o
37、f the diagnostic connector. This allows the OEM to better optimize the cost/performance of their design. 4.2.1 Signal Definition Electronic devices that connect to the SAE J1939-1 vehicle network shall meet the signal characteristics as specified in SAE J1939-11, SAE J1939-14, and SAE J1939-15. SAE
38、J1939-15 is harmonized with SAE J1939-11 allowing the backwards-compatible interoperation among components. SAE J1939-11, SAE J1939-14, and SAE J3939-15 provide reference designs that are compatible with ISO 11898. SAE J1939-1 Revised NOV2012 Page 6 of 8 4.2.2 Media The physical media shall meet the
39、 requirements of either SAE J1939-11, SAE J1939-14, or SAE J1939-15, as appropriate for the network. Any single segment of the vehicle network shall use only one of these physical layers. The implementer should note that there are specific differences between SAE J1939-11 and SAE J1939-15 in regard
40、to media. SAE J1939-11 specifies a shielded twisted-pair cable media, while SAE J1939-15 specifies a un-shielded twisted-pair cable media. These cable media have been specified with regard to the harsh environment typically encountered in heavy-duty on-highway vehicle applications. 4.2.3 Topology Th
41、e network integrator, typically the vehicle OEM, is responsible for the design and implementation of the SAE J1939 network topology in the vehicle, following the requirements within SAE J1939-11, SAE J1939-14, or SAE J3939-15. The implementer should note that there are specific differences between S
42、AE J1939-11, SAE J1939-14 and SAE J1939-15, for example in regard to backbone termination, stub length and number of ECUs allowed. Any single segment of the complete vehicle network shall meet the requirements of either SAE J1939-11, SAE J1939-14, or SAE J1939-15. Also as specified in SAE J1939-31,
43、Network Interconnection ECUs shall be used to interconnect different segments into a complete vehicle network topology. A typical implementation includes a single segment of SAE J1939-11, SAE J1939-14, or SAE J1939-15 connecting all of the ECUs on the truck/tractor. SAE J1939 does not specify a meth
44、od to connect a towed device (trailer) to the network, but ISO 11992 can be used for this if needed. In this situation, a bridge device would be required to interface between the SAE J1939 network segment and the ISO 11992 network segment. 4.2.4 Diagnostic Connector The diagnostic connector defined
45、in SAE J1939-13, Diagnostic Connector, shall be used as described therein. 4.3 Data Link Layer Definition The data link layer on SAE J1939 vehicle networks shall conform to SAE J1939-21. 4.4 Network Layer Definition SAE J1939-31 defines the network layer provisions in the SAE J1939 family of specifi
46、cations. The overall vehicle network may consist of multiple network segments, and as noted in discussion of Topology, Network Interconnection ECUs as described in SAE J1939-31 shall be used to connect the different network segments together. 4.5 Application Layer There are two documents that define
47、 the application layer functionality that may be implemented on a heavy duty on-highway vehicle. SAE J1939-71 defines various data elements and messages used for vehicle control and communications. SAE J1939-73 defines various diagnostic services and data content for diagnostics messages on a SAE J1
48、939 network. The data elements and messages defined in SAE J1939-71 and SAE J1939-73 can be considered as a dictionary of the possible information that can be communicated on a SAE J1939 network. The components on the vehicle and their supported functionality determine what actual data elements and
49、messages will be present on a network. The network integrator has the responsibility to assure that all network devices adhere to these application documents, with regard to correct data content and message structures and timing. 4.6 On Board Diagnostics (OBD) Considerations Many heavy-duty on-highway vehicles that utilize an SAE J1939 network may be subject to regulatory requirements for OBD. SAE J1939-03 has been developed to provide gu
