mapp Services V5.16
The J1939 CAN message is structured as follows:
The CAN identifier consists of 3 parts: the priority, parameter group number (PGN) and source address. For more information about the PGN, see here. The priority of a PGN can be taken from the J1939 standard. For more information, see SAE J1939 at Wikipedia.
Resolving a CAN identifier
A CAN identifier can be 18FF72E0, for example. To find out which PGN and priority the CAN identifier has, proceed as follows:
1. Convert
The CAN identifier is specified in hex format. To find out the PGN number and priority, the hex format must be converted to binary format.
18FF72E0 in binary is 0001 1000 1111 1111 0111 0010 1110 0000.
2. Determine the PGN and priority
From the binary number, the PGN, priority and source address can be determined again in hex format.
•Priority: 6
•PGN: FF72
•Source address: E0