News Center

The relationship between CAN2.0 and J1939 protocol

www.premier-cable.net


The relationship between CAN2.0 and J1939 protocol

 

 

CAN2.0 is a bus specification and a data link layer technology. 

 


J1939 is a CAN bus-based specification defined by SAE (American Automobile Association), which aims to solve the compatibility issues of different engine manufacturers and different ECU manufacturers.

 


1. The relationship between J1939 and CAN2.0

 


J1939 is a reinterpretation of the 29-bit ID of the arbitration field on the basis of CAN2.0B; the other parts are exactly the same.

 


The 29-bit ID is divided into: 3-bit priority, 8-bit PF (frame format), 8-bit PS (frame extension), 8-bit SA (source address), 1-bit DP (Data Page), 1 bit is reserved.

 


Among them, 1-bit DP, 8-bit PF, and 8-bit PS form the PGN;

 


PGN is Parameter Group Number; it is a list of parameter groups.

 


In J1939, the message is divided into two formats, PDU1 and PDU2.

 


The message in PDU1 format is sent to the ECU with a specific address, and the address is recorded with 8-bit PS; the message in PDU2 format is sent to all ECUs, and the 8-bit PS is used for expansion.

 


When the value of PF is 0-239, it means that the message is in PDU1 format, and PS is DA (destination address).

 


When the value of PF is 240-255, it means that the message is in PDU2 format, and PS is the extended address.
 

Related News


What does a NMEA 2000 do?

Are you looking for the NMEA 2000 Supplier? Our Premier Cable designs and manufactures cable assembly connectors that support open standard cables, cable assemblies, connectors, terminals, and power supplies for NMEA 2000 systems.


USB FTDI Cable IP67 waterproof round connector manufacturers introduce the development direction of the waterproof connector

USB FTDI Cable IP67 waterproof round connector Manufacturers tell you that the waterproof connector is a connector with the ability to work underwater, which can provide normal, safe, and reliable power supply and signal transmission to the electronic components, and can also play a very good role in the waterproof and dustproof effect.


What is Active Cable?

Using active cables has many advantages over passive cables. Our Premier Cable is an cable asemblies manufacturer over 18 years. Leave us messages now for more active cable details.


What is the difference between DB9 and RS232?

DB9 and RS232 are not the same thing. DB9 belongs to the connector model, while RS232 belongs to a communication protocol. Follow our Premier Cable to learn more different between them.


What is etherCON used for?

Are you looking for the Outdoor Entertainment Cat5e CAT6A etherCON Cable supplier? Our Prmier Cable is a 18+ years manufacturer in the cable harness, enabling on-demand matching and customization. Email us now for more details!


Axia AES Digital Audio Transmission

Are you looking for an Audio Video Cable wholesaler? Premier Cable is an 18+year cable harness assembly supplier specializing in cable assemblies and related products, providing more OEM customized cables than any other manufacturer.