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The SAE J1939 DBC file contains decoding rules for converting raw J1939 data to 'physical values' (Mph, %, etc.). This file lets you easily decode data from heavy duty vehicles (trucks, buses, tractors, etc.).
This DBC file download includes:
What is a DBC file?
A DBC file is a standardized method for storing the "rules" on how to interpret raw CAN bus data. In particular, it contains details on what 'signals' (e.g. RPM, Vehicle Speed, …) are contained within which 'messages' (i.e. CAN IDs).
In the J1939 standard, messages are referred to as Parameter Group Numbers (PGN) and signals as Suspect Parameter Numbers (SPN).
Further, a DBC file includes names, descriptions, positions and lengths of the signals - as well as how to offset &; scale them.