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This page was last edited on 31 Octoberat This article needs additional citations for verification. Technical and de facto standards for wired computer buses.
SAE J - Wikipedia
SAE J has been adopted widely by diesel engine manufacturers. A PGN identifies a message's function and associated data.
Since then, CAN has been j1399-71, the chipset for J has been clocked faster [ clarification needed ]and bit addresses PGN have replaced 8-bit addresses. Society of Automotive Engineers standard SAE J is the vehicle bus recommended practice used for communication and diagnostics among vehicle components. Views Read Edit View history.
From Wikipedia, the free encyclopedia.
J | J Application Layer
The session and presentation layers are not part of the specification. This was true as of Articles needing additional references from September J193-971 articles needing additional references Wikipedia articles needing clarification from June All articles with unsourced statements Articles with unsourced statements from September All articles with vague or ambiguous time Vague or ambiguous time from December Computer buses Automotive standards Automotive software.
j11939-71 One driving force behind this is the increasing adoption of the engine Electronic Control Unit ECUwhich provides one method of controlling exhaust gas emissions within US and European standards.
Interfaces are listed by their speed in the roughly ascending order, so the interface at the end of each section should be the fastest. Consequently, SAE J can now be found in a range of diesel-powered applications: CAN was not originally free, but its instruction set did fit in the custom instruction format of J Unsourced material may be challenged and removed.
Because with the demanding standards engine development is expensive, truck based engines are reused in many fields. All J packets, except for the request packet, contain eight bytes of data and a standard header which j1939-771 an index called Parameter Group Number PGNwhich is embedded in the message's bit identifier.
J n1939-71 to define standard PGNs to encompass a wide range of automotive, agricultural, marine and off-road vehicle purposes. Please help improve this article by adding citations to reliable sources.
A different physical layer is used between the tractor and trailer, specified in ISO September Learn how and when to remove this template message. Originating in the car and heavy-duty truck industry in the United States, it is now widely used in other parts of the world.