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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1j708 this time is exceeded, the message is not valid. The maximum length, from the MID to the checksum, is 21 bytes. SAE J and J are different on software and hardware.

Still called a Deutsch plug, this one was changed to 9-pins. Forum Themes Elegant Mobile. Hallo Thank you for the report back.

Other In-Vehicle Communication Protocols | Inventure Automotive Inc.

The CAN protocol is totally incompatible with J I only just saw this post. The bus is considered idle if there is no activity i.

This is a Microchip forum. Adding these quickly mandated features required even more hardware and software to be added as standard features on every vehicle. I have the same feeling about this forum, “no moderaters involved” there are so many questions about CAN.


Instead, using 47 potocol resistors, each node is impedance matched to the network. User Control Panel Log out. If the engine is not running and the vehicle is not moving, messages longer than 21 bytes may be transmitted. Common application and transport layers used on J are J and J Characters are transmitted in the common 8N1 format. I also post at: Thanks to all for your reply.

J is outdated and is currently being phased out of production. 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 only indication of when the message is over is when the transmission stops. View the discussion thread. 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 communicates diagnostic information, while J communicates control data.

j and CAN | Microchip

It still has power, ground and J connections in addition to the new J wires. J Data Link J is a differential serial communications bus which is half duplex and multi-master i. It uses 8, N, 1 byte framing and has a network speed of bits per second bps. The resessive state is high, and dominante is low.

I think that not many eng. It is just strange that not one of the microchip application Engineers get involved in this topic. None of this is handled the same in J The time between the last time the ECU i.


If you have a general CAN question that is probably a better place to look than here. Why does my PIC32 run slower than expected? It also added the option for a second CAN connection for proprietary data networks. The logical j170 transmitted onto the bus is the difference in voltage between the two wires.

J is a multi-master network tooand it implemented the bus arbitration too, but different than the CAN hardware arbitration, J using softrware.

j1708 and CAN

A logical 1 is when wire A is more than 0. However, there are protockl something similiar: I did not get any usefull response on my repeater question. In J, each message is defined a priority. Also, in CAN, part way through transmitting the message pdotocol transmitter releases the bus for 1 bit time and receiving nodes are supposed to send an ACK bit. Essentials Only Full Version.

This technology-related article is a stub.