High-performance SAE J software based protocol stack. Complete J source code is provided. 15 Nov Get on the Bus: J and J Vehicle Bus Standards on established protocols that vary based on vehicle manufacturer, vehicle model. 14 Nov 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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Forums Posts Latest Posts. 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.

More correctly, request data. Thanks to all for your reply. I also post at: I’m afraid it is “users, help yourselves” here, and unfortunately, not many prrotocol posters are working on CAN. Soon after, multiple studies showed that adding sophisticated j7108 the time features such as antilock brakes and air bags saved lives.

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J / J Network Operation and Testing – BusTekHub

The basic problem is that the CAN specification defines certain requirements around the identifier, or the first part of the message. A priority 1, which is the most critical, waits an additional 0. This increases the simplicity of your application software, improves your reliability, and shortens your product’s time to market.


For bytes to be considered as part of a message, the time between bytes is not allowed to exceed 2 bit times. The logical value transmitted onto the bus is the difference in voltage between the two wires. I have the same feeling about this forum, “no moderaters involved” there are so many questions about CAN.

J J Vehicle Bus Standards. The J device driver was designed by Simma Software and has been used in numerous automotive embedded systems.

J1587 / J1708 Network Operation and Testing

Transmission is accomplished by controlling the driver enable pin of the transceiver. For more info, please refer to our forum links: It is designed to work with our J software and abstracts away 1j708 technical details and many complexities associated with message timing and interfacing to the physical layer.

It defines the physical layer and data link layer. The maximum length, from the MID to the checksum, is 21 bytes.

j and CAN | Microchip

If you have questions about J, try our J Introduction. The original standard is recognized by two designators: And that’s just the beginning.

Do you know if your trucks are J or J? The protocol is maintained by SAE International. J is mainly used on heavy-duty and commercial vehicles. A message is composed of up to 21 characters, unless the engine is stopped and the vehicle is j11708 moving in which case transmitters are allowed to exceed the 21 byte max message length.


j1708 and CAN

None of this is handled the same in J Please contact us if you are interested in a port or device driver for a hardware platform that is not listed.

The max length of any J is 21 bytes 10 bits per character. The wires should have one twist per inch and have j1078 maximum length protoxol 40 meters. Omnitracs makes no representations, warranties, or other commitments whatsoever about any non-Omnitracs sites or third-party resources that may be referenced, accessible from, or linked to this site.

J Inter-character Bit Time For bytes to be considered as part of a message, the time between bytes is not allowed to exceed 2 bit times. This standard was put into production vehicles as a standard. So even if you got past the bit-stuffing, the receiver could trash the message being sent, and would miss protovol of the bits. Common application and transport layers used on J are J and J