Jetter JVM-407B-HMI, User Manual

Page: 146 / 300

146 Jetter AG
7 SAE J1939 STX API
Content of a J1939 message
The following diagram shows the structure of a J1939 message:
Abbreviation Description
DA Destination Address
GE Group Extensions
PDU Protocol Data Unit
PGN Parameter Group Number
SA Source Address
The PGN is a number defined in the SAE J1939 standard that groups together
several SPNs into a meaningful group. The PGN is part of the CAN identifier.
The 8-byte data (PDU) contain the values of individual SPNs.
The example below shows a PGN 65262 (0xFEEE):
PGN 65262 Engine Temperature 1
- ET1
Part of the PGN Value Comment
Transmission Repetition Rate 1 s
Data Length 8
Extended Data Page 0
Data Page 0
PDU Format 254
PDU Specific 238 PGN Supporting Information
Default Priority 6
Parameter Group Number 65262 in hex: 0xFEEE
Content of a J1939
Message
Meaning of the
Parameter Group
Number (PGN)