Features: The MCU341 is a USB bus adapter chip that provides asynchronous serial interfaces such as asynchronous serial port, print port, well port, and commonly used 2wires and 4wire synchronous serial interfaces via the USB bus. In the asynchronous serial port, CH341 provides main Estyle speeds control signal such as serial port enable, port receive ready, as well as the commonly used MOOEM contact signal, which can be used to extend the asynchronous serial port for computers, or directly upgrades the common serial devices to the USB and cable. The CH341 provides a standard USB print port that is compatible for the USB specification and Window operating systems, which can be used to upgrades a common wellhead printer to USB and money. The CH341 provides 8bit line interfaces in EPPs or MEMmode, which can be used to input and output data directly without the need of a microcontroller. In addition, the CH341A chip also hosts some commonly used synchronous serial interfaces, such as 2wires interfaces (SCL line, SOAline) and 4wire interfaces (CSline, SCK/CLK line, M1SO/S01/DIN line, MOSI/SDO/DOUT line) and so on. Note: Received, board on the reverse side of the pad 5V/3.3V power supply selection pad, please choose your own welding. Specifications: Component:Plastic Size:Approx.4x1.8cm/1.57x0.71inch MCU341 CH341A USB Bus Adapter Module Programmer RS232/RS485/RS422 Package Includes: 1pc MCU341 USB Bus Adapter 2pcs Pin note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.