SAE J 1939-15-2015 Physical Layer 250 Kbps Un-Shielded Twisted Pair (UTP).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 ther
2、efrom, 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 2015 SAE International All rights reserved. No part of this
3、publication 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: +1 724-776-49
4、70 (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/J1939/15_201508 SURFACE VEHICLE RECOMMENDED PRACTICE J1939-15 AUG2015 Issued 200
5、3-11 Revised 2015-08 Superseding J1939-15 MAY2014 Physical Layer, 250 Kbps, Un-Shielded Twisted Pair (UTP) RATIONALE Document is revised to correct a typographical error in a reference to ISO 11898, and to modify Appendix B for consistency with SAE J1939-11. FOREWORD The set of SAE J1939 Recommended
6、 Practice documents define a high speed ISO 11898 CAN protocol based communications network 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. The
7、 SAE J1939 communications network is developed for use in heavy-duty environments and suitable for use in horizontally integrated vehicle industries. The physical layer aspects of SAE J1939 reflect its design goal for use in heavy-duty environments. Horizontally integrated vehicles involve the integ
8、ration of different combinations of loose package components, such as engines and transmissions, which are sourced from many different component suppliers. The SAE J1939 common communication architecture strives to offer an open interconnect system that allows the ECUs associated with different comp
9、onent manufacturers 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 inte
10、rest include, but are not limited to, on-highway and off-highway trucks and their trailers, construction equipment, and agricultural equipment and implements. This set of SAE Recommended Practices has been developed by the SAE Truck and Bus Control and Communications Network Committee of the SAE Tru
11、ck and Bus Electrical and Electronics Steering Committee. 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 architecture. These SAE J1939 documents are int
12、ended as a guide toward standard practice and are subject to change to keep pace with experience and technical advances. SAE INTERNATIONAL J1939-15 AUG2015 Page 2 of 19 TABLE OF CONTENTS 1. SCOPE 3 2. REFERENCES 3 2.1 Applicable Documents 3 2.1.1 SAE Publications . 3 2.2 Related Publications . 4 2.2
13、.1 ISO Publications 4 3. NETWORK PHYSICAL DESCRIPTION . 4 3.1 Physical Layer . 4 3.2 Physical Media 4 3.3 Differential Voltage 4 3.4 Bus Levels . 4 3.5 Bus Levels During Arbitration . 4 3.6 Common Mode Bus Voltage Range . 4 3.7 Bus Termination 5 3.8 Internal Resistance . 5 3.9 Differential Internal
14、Resistance . 5 3.10 Internal Capacitance . 5 3.11 Differential Internal Capacitance . 5 3.12 Bit Time . 5 3.13 Internal Delay Time . 5 3.14 CAN Bit Timing Requirements 5 4. FUNCTIONAL DESCRIPTION . 6 5. ELECTRICAL SPECIFICATION . 6 5.1 Electrical Data . 6 5.1.1 Electronic Control Unit 6 5.1.2 Bus Vo
15、ltages - Operational . 7 5.1.3 Electrostatic Discharge (ESD) 7 5.1.4 Example Physical Layer Circuits . 7 5.2 Physical Media Parameters 7 5.2.1 Bus Line 9 5.2.2 Topology . 9 5.2.3 Terminating Resistor . 10 5.2.4 Shield Termination 11 5.2.5 ECU Type I and Type II Markings . 11 5.3 Connector Specificat
16、ions 11 5.3.1 Connector Electrical Performance Requirements . 12 5.3.2 Connector Mechanical Requirements . 12 6. CONFORMANCE TESTS . 12 6.1 Recessive Output of the ECUs . 12 6.2 Internal Resistance of CAN_H and CAN_L 12 6.3 Internal Differential Resistance . 12 6.4 Recessive Input Threshold of an EC
17、U 12 6.5 Dominant Output of an ECU . 12 6.6 Dominant Input Threshold of an ECU . 12 6.7 Internal Delay Time . 12 7. DISCUSSION OF BUS FAULTS 12 7.1 Loss of Connection to Network . 12 7.2 Node Power or Ground Loss 13 7.3 Unconnected Shield 13 7.4 Open and Short Failures . 13 SAE INTERNATIONAL J1939-1
18、5 AUG2015 Page 3 of 19 8. NOTES 13 8.1 Revision Indicator 13 Figure 1 Cable cross-section and bend radius 9 Figure 2 Wiring network topology (type I ECUS only) . 9 Figure 3 Wiring network topology (one type II ECU installed) 10 Figure 4 Wiring network topology (two type II ECUS installed) 10 Figure
19、5 An example of SAE J1939-11 connector usage in a SAE J1939-15 network 11 Figure A1 Example of preferred signal rise/fall waveforms . 14 Figure B1 Cable termination 3 cavity connector 15 Figure B2 Cable termination of a typical 2 cavity connector . 15 Figure B3 Typical finished assembly . 15 Figure
20、C1 Cable splice . 16 Figure C2 Sealed cable splice-finished assembly . 16 Figure D1 Cable splice . 17 Figure D2 Cable splice-finished assembly . 17 Figure F1 SAE J1939-11 tool connected to the SAE J1939-15 network 19 Figure F2 ECU (using SAE J1939-11 pigtail and 3-pin connector) connected to the SAE
21、 J1939-15 network 19 Table 1 AC parameters of an ECU disconnected from the bus line 6 Table 2 Physical media parameters for un-shielded twisted pair cable . 8 Table 3 Network topology parameters . 10 Table E1 Comparison SAE J1939-15 vs SAE J1939-11 . 18 1. SCOPE This document describes a physical la
22、yer utilizing Unshielded Twisted Pair (UTP) cable with extended stub lengths for flexibility in ECU placement and network topology. Also, connectors are not specified. CAN controllers are now available which support the newly introduced CAN Flexible Data Rate Frame format (known as “CAN FD”). These
23、controllers, when used on SAE J1939-15 networks, must be restricted to use only the Classical Frame format compliant to ISO 11898-1 (2003). These SAE Recommended Practices are intended for light- and heavy-duty vehicles on- or off-road as well as appropriate stationary applications which use vehicle
24、 derived components (e.g., generator sets). Vehicles of interest include but are not limited to: on- and off-highway trucks and their trailers; construction equipment; and agricultural equipment and implements. 2. REFERENCES General information regarding this series of recommended practices is found
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