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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J1587 / J1708 Network Operation and Testing

If this time is exceeded, UART based framing errors may occur on the bus. It uses 8, N, 1 byte framing and has a network speed of bits per second bps. In all other treads i constanly see MC moderator input only at the Can nothing. It defines the physical layer and data link layer. It is just strange that not one of the microchip application Engineers get involved in this topic. Technical and de facto standards for wired computer buses. You can help Wikipedia by expanding it.

For more info, please refer to our forum links: J Priority In J, each message is defined a priority. In CAN, the message length is defined as part of the identifier, and is a maximum of 8 bytes. This thread is a little old, but it doesn’t seem like anyone really answered the question, so I’ll give it a try.

And you can not build a large canbus without repeaters. The maximum length, from the MID to the checksum, is 21 bytes.

j1708 and CAN

J — the physical layer i. Our ssJ device driver has protocop ported to over 15 different microcontrollers. Thanks to all for your reply.

SAE J is a standard used for serial communications between ECUs on a heavy duty vehicle and also between a computer and the vehicle. They are not related at all. If this time is exceeded, the message is not valid.


For bytes to be considered as part of a message, the time between bytes is not allowed to exceed 2 bit times. We have device drivers for both. The hardware utilized are RS transceivers wired for open collector operation through the use of a pullup and pulldown of the separate data lines.

Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond Why does my PIC32 run slower than expected? A logic pdotocol is when B is 0.

The SAE sought to establish this standard across protoocol brands of heavy duty trucks in order to avoid the discrepant and proprietary protocols adopted by the manufacturers of light duty vehicles. If you have any questions, please contact us at http: 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.

Do you know if your trucks j170 J or J? If so, if the j protocol is on the rs physical layer, can the CAN be interface to the rs so it can interpret the j protocol??? Links to useful PIC information: By most heavy duty truck and engine manufacturers had adopted at least a partial implementation of J Every message ends with a twos complement checksum.

J Data Link J is a differential protlcol communications bus which is half duplex and multi-master i. The max length of any J is 21 bytes 10 bits per character.

J / J Network Operation and Testing – BusTekHub

The CAN protocol is totally incompatible with J Maybe that there is not that much interest in this topic??? Forums Posts Latest Posts. Protocok are numerous CAN forums on the web. Also, the message length of J is variable up to 21 bytes for prohocol messages. Transmission is accomplished by controlling the driver enable pin of the transceiver. Below is the list of available ports.


I don’t blame microchip for not responding to the vast majority of these postings.

J and J Vehicle Bus Standards | Omnitracs

The last byte of every message is the two’s complement of the MID and data contained in the message. The priority defines how much additional time must transpire after the bus has become idle before a node may transmit.

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. This is a Microchip forum.

There are 8 different priorities, ranging from 1 to 8. J also has its own special connector. It is designed to work with our J software and abstracts away the technical details and many complexities associated with message timing and interfacing to the physical layer.

Hi The Can controller area network on this forum is not a very successful topic I have also questions on this forum about Can It is just strange that not one of the microchip application Engineers get involved in this topic.

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.