J1939 bus data logger, the method and process elements are arranged

The present invention discloses a data logger J1939 bus, MCU includes a main controller, the master controller reads the MCU J1939 data bus data and diagnostic data of the vehicle based on the CAN bus protocol UDS via two CAN interface circuits, the said main controller MCU read and write TF TF card via the interface circuit card, the main controller MCU module providing a clock signal by the RTC. STM32 MCU to the master controller chip, and uses the operating system uCos-iii. The present invention also discloses a method and device arrangement process J1939 bus data logger can be widely used for recording data J1939 bus commercial buses and trucks, for the vehicle data bus for offline analysis. The present invention is very convenient to use, truly plug and record, and the record of the data files can be opened using specific software to perform data analysis.