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JCOM.J1939.REC – Prototyping Hardware

SAE J1939 Gateway Module With USB Port, RTC, MicroSD Memory Card for data logger applicationsThe hardware design is based on our SAE J1939 Gateway Module With USB Port, RTC, MicroSD Memory Card. This gateway board is a high-performance, low-latency vehicle network adapter for SAE J1939 applications. It allows any host device with a USB COM port to monitor SAE J1939 data traffic and communicate with the SAE J1939 vehicle network.

The board supports the full SAE J1939 protocol according to J1939/81 Network Management (Address Claiming) and J1939/21 Transport Protocol (TP). It is also supported by an extensive programming interface for Windows and Linux/Ubuntu applications, including full C/C++/C# source code for short time-to-market developments.

The strength of the board lies in the fact that the entire SAE J1939 protocol, including all timing requirements, is stored on-chip, thus taking the burden off the main system.

SAE J1939 Data Recorder - PrototypeThe board supports a USB transfer rate of up to 480 Mbps, allowing high data throughput. Also, the onboard real-time clock supports the timestamping of the SAE J1939 data frames (PGN). Furthermore, the board comes with a MicroSD memory card slot, which opened the door to future applications such as a SAE J1939 data logger.

We have created a prototype (as shown to the right) based on the above-mentioned USB board, extended by a power-supply board that accepts a power input range of 7 VDC to 36 VDC as it applies to diesel engine operation.

The terminals for power and CAN Bus connection will be replaced by a 9-pin DSUB connector, while the USB connection will be changed from USB-mini to a USB 2.0 design to assure operation under harsh environmental conditions (dust, splash-water).

Modifications

  • The board size will be increased to fit the additional power supply components.
  • The only external components will be the USB port and the CAN/Power Supply DSUB-9 connector.
  • The USB connection will be USB 2.0 to meet the challenges of harsh environments.
  • The SD card will be accessible through opening the enclosure.
  • The 120 Ohm termination resistor is activated per onboard jumper.
  • The board will have no LEDs to lower power-consumption (reducing battery drain).
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