High-performance SAE J software based protocol stack. Complete J source code is provided. Get on the Bus: J and J Vehicle Bus Standards on established protocols that vary based on vehicle manufacturer, vehicle model. J defines the physical layer, which are the hardware (wiring) and basic protocol that is needed for J and J to transmit messages.

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So even if you got past all the problems with the bit stuffing and ACK, there’s no way you could prptocol all the J data. Its my major product, so I rely would like more people to look at this forum.

Get on the Bus: J1708 and J1939 Vehicle Bus Standards

Please contact us if you are interested in a port or device driver for a hardware platform that is not listed. J Bus States The logical value transmitted onto the bus is the difference in voltage between the two wires. Its main purpose is to address the transmission of electronic signals and information among truck protkcol bus components i. Since this post were made in January we also advaced great steps in CAN development and I must admit that Microchip Switzerland got on Board with us and supported us with Technical know how and advice.


Hallo Thank you for the report back. Adding these quickly mandated features required even more hardware and software to be added as standard features on every vehicle. The only indication of when the message is over is when the transmission stops. Every message ends with a twos complement checksum. J and J Vehicle Bus Standards. While market demand for vehicle electronics are driving innovation and complexity, the networked vehicle originated from government requirements to control and regulate vehicle emissions and reduce air pollution.

The messages are prioritized and one protocpl both send and recieve.

j1708 and CAN

Each subsequent priority adds an additional 0. It is just strange that not one of the microchip application Engineers get involved in this topic.

SAE J and J are different on software and hardware. J Idle Time The bus is considered idle if there is no activity i. If this time is exceeded, UART based framing errors may occur on the bus. I1708 that there is not that much interest in this topic??? Below is the list of available ports. The max length of any J is 21 bytes 10 bits per character.

Forums Posts Latest Posts. I only just saw this post.

This includes bit stuffing at pre-defined intervals the transmitter adding bits that are not part of the message at all. Haven’t received registration validation E-mail? Technical and de facto standards for wired computer buses. There are 8 different priorities, ranging from 1 to 8. Interfaces are listed by their speed in the roughly ascending order, so the interface at the end of each section should be the fastest.


Selecting which document is determined by the MID of the message. Also, the message length of J is variable up to 21 bytes for standard messages.

Essentials Only Full Version. Omnitracs’ Road Ahead blog Get on the Bus: Starting init included a specific diagnostic connector to be used on all heavy protocpl vehicles.

The CAN protocol is totally incompatible with J Although I can answer some questions about CAN, I am by now means an expert and have only used it for about eight months.

J — the physical layer i.

J / J Network Operation and Testing – BusTekHub

;rotocol is being replaced by J The SAE sought to establish this standard across all brands of heavy duty trucks in order to avoid the discrepant and proprietary protocols adopted by the manufacturers of light duty vehicles.

Automotive standards Technology stubs. J communicates diagnostic information, while J communicates control data. Views Read Edit View history. None of this is handled the same in J