Mixing J1939 and CAN Messages

J1939 frames in the database and CAN frames data in XNET include the Application Protocol property. This means you can mix J1939 and standard CAN messages in one session. Standard CAN messages cannot exceed 8 bytes and do not use the node address.

In standard CAN frames, the complete identifier is considered as the CAN message identifier; in J1939, only the PGN determines the message. Frames with the same PGN but different priority or source address are considered the same message.

Received frames with extended identifier always are considered J1939 frames. If you use extended CAN frames as non-J1939 frames, you must process the received data to update the Application Protocol property.