J1939 Version

· J1939
J1939 interface is a high-level protocol based on Controller Area Network, which is widely used in serial data communication between electronic control unit (ECU) in heavy vehicles. This protocol provides a standardized interface for network communication of heavy vehicles, which is helpful for interoperability between ECU of different manufacturers. By using multiplexing technology, the standardized high-speed network connection based on CAN bus is provided for each sensor, actuator and controller of the vehicle, and high-speed data sharing is available. Support user-defined parameters and messages, which is convenient for development and customization according to different specific needs.

· RS232
RS232 interface is a standard interface for serial communication between devices, mainly used to connect data terminal equipment (DTE) and data communication equipment (DCE) to realize communication, and is known for its simplicity and wide compatibility. However, the maximun transmission distance is about 15 meters, and the transmission rate is relatively low. The maximum transmission rate is usually 20Kbps.
Generally, RS485, RS422 and RS232 are all serial communication interface standards, but their characteristics and application scenarios are different. In short, the RS232 interface is suitable for applications that do not need long-distance fast data transmission, and it has good compatibility with some old equipment and systems. When it is necessary to transmit data in both directions at the same time and the number of connected devices is less than 10, RS422 may be a better choice. If more than 10 devices need to be connected or a faster transmission rate is needed, RS485 may be more ideal.

· GPIO
GPIO is a set of pins, which can be configured in input mode or output mode. When the GPIO pin is in the input mode, it can receive signals from sensors (such as temperature, humidity, illumination, etc.), and convert these signals into digital signals for tablet processing. When the GPIO pin is in the output mode, it can send control signals to actuators (such as motors and LED lights) to achieve precise controls. GPIO interface can also be used as the physical layer interface of other communication protocols (such as I2C, SPI, etc.), and complex communication functions can be realized through extended circuits.
3Rtablet, as a supplier with 18 years’ experience in manufacturing and customizing vehicle-mounted tablets, has been recognized by global partners for its comprehensive customized services and technical support. Whether it is used in agriculture, mining, fleet management or forklift, our products show excellent performance, flexibility and durability. These extension interfaces mentioned above (CANBus, RS232,etc.) are customizable in our products. If you are planing to optimize your workflow and improve the output by the power of tablet, don’t hesitate to contact us to learn more about the product and solution!