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JCOM.J1939.USB-X – SAE J1939 Gateway Module With USB Port, RTC, MicroSD Memory Card

Hardware Features

The JCOM.J939.USB-X SAE J1939 Processor board is an extended version of our popular JCOM.J9139.USB-B SAE J1939 ECU Simulator Board With USB Port. The most significant difference is that the -X version supports a USB transfer rate of up to 480 Mbps, allowing higher 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 opens the door to future applications such as a CAN Bus / SAE J1939 data logger.

The improved features are:

  • Upgraded ARM Cortex-M3 processor with double Flash & RAM
  • Supports Hi-Speed USB 2.0 transfer rate at up to 480 Mbps
  • Additional UART-USB for onsite firmware programming
  • Onboard Real-Time Clock (RTC) for CAN Bus message timestamp support
  • MicroSD Memory Card support
  • 4-position DIP switch (one for termination resistor, three for functionality settings)
  • Additional serial (UART) port for GPS sensor or SAE J1708 board

Board Components

JCOM.J1939.USB-X Side View with CAN Port DIP Switch LEDs


  • SW1 = ON – Disables the USB Communication Port and uses the USB Programming Port instead. This setting applies after a Reset of the gateway. It establishes hardware compatibility with the JCOM.J1939.USB-B gateway (USB-to-UART converter at 115,200 baud). This feature applies to firmware version 2.01.00 and higher.

JCOM.J1939.USB-X Side View Memory SD Card USB Ports


  • The driver for the USB Communication Port is installed automatically by the Windows operating system.
  • The USB Programming Port is used for future firmware updates.
  • The MicroSD card slot will support future applications, such as a CAN Bus or SAE J1939 Data Logger. All future updates will be available free-of-charge.
  • The LED will indicate SD card access.

SAE J1939 Gateway Module With USB Port, RTC, MicroSD Memory Card


  • The RTC battery size is Lithium CR1220 (battery not included). The battery is not needed when operating the board with our JCOM1939 Monitor Software, since the software synchronizes the time between the PC and the onboard RTC. The battery will be necessary when operating the board independently from PC communication (future feature).
  • The serial extension board allows adding a GPS sensor or an SAE J1708 board (future applications).
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