J1939 Software
J1939
J1939 Protocol Stack
J1939 Protocol Stack
     
 

Experience Summary

  • 95 Real-Time Embedded Systems
  • 45 Microcontrollers & DSPs
  • 25 Protocol Stacks
  • 20 CAN Device Drivers
  • 15 Flash Bootloaders
  • 7 Real-Time Operating Systems
  • 2 United States Patents Pending

J1939 PGN

 
In SAE J1939, the acronym PGN stands for Parameter Group Number and represents the identifier of a J1939 message. Every J1939 message has a unique PGN assigned to it by the SAE committee when the message is defined.
 
A PGN is 18-bits wide and is made up of the following fields: Extended Data Page, Data Page, PDU Format, PDU Specific. Depending on the value of the PDU Format field, a message is either destination specific, meaning it is for a specific CA, or global, meaning it is for all CAs. The PGN identifier is encoded to allow for a maximum of 8,672 unique PGNs.
 
PGN 61444             Electronic Engine Controller 1
 
Transmission Repetition: engine speed dependent
Data Length: 8
Default Priority: 3
Parameter Group Number: 61444
 
Start Position Length Parameter Name SPN
1.14 bitsEngine Torque Mode899
21 byteDriver's Demand Engine - Percent Torque512
31 byteActual Engine - Percent Torque513
4-52 bytesEngine Speed190
61 byteSource Address of Controlling Device of Engine1483
7.14 bitsEngine Starter Mode1675
81 byteEngine Demand - Percent Torque2432
 
   
 
 
 
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