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The development of SAE J1939 was prompted by the Heavy Truck industry because of a need for a in-vehicle real time network operating capability (referred to as a “SAE Class C Network”). SAE J1939 has now been adopted for use in tractors and other off road equipment. This paper will outline SAE J1939 network development tools that are available to support hardware and software engineers. An example SAE J1939 network application done by Oklahoma State University will show how some of these tools could be used on tractors.

The objective of this paper is to suggest the advantages of using SAE J1699 tests and methods as a basis for characterization of physical layer devices. This paper will examine some of the commercially available physical layer IC's that could be used to drive Class B and C multiplex networks. Device characteristics such as propagation delays, current consumption, and common mode will be presented. These characteristics could be used to test device performance in Class B and Class C multiplex applications. Also presented will be an introduction to the new SAE J1699 Recommended Practice for multiplex device testing and how J1699 might be used for physical layer device testing.

This paper describes the new Recommended Practice SAE J1939 (High Speed Communications Protocol for On-Road Heavy Vehicles) and the development and application of this protocol for off-road vehicles such as agricultural machines and construction equipment. This paper will review the work of ISO committees in the development of an international standard for vehicle high speed communication systems. The proposed use of SAE J1939 and the CAN protocol for Class C (high speed) network communications on Off-Road Vehicles is also reviewed.