The excellent performance of ft4232hl is very suitable for industrial occasions with high requirements. It realizes the simultaneous communication of a single USB and four UART serial ports, which are independent and independent of each other. The computer displays four COM ports and provides a communication rate limited to 12mbps. Instructions:Use the USB cable to connect the computer and the micro-usb interface on the board. After the computer installs the driver, you can see that there are four COM ports. Use the short-circuit cap to select the desired voltage of VCC / TX / RX on the TTL power selection interface to output the corresponding voltage. The smallest value of COM port corresponds to the first TTL interface, and the largest value corresponds to the fourth TTL interface (the value of COM port is not fixed). For simple test, you can short-circuit TX / Rx, and then use the upper computer to send information to see if there is data echo. Colour:Green Material:PC Package Contents: 1 x Converter Module(Due to different product batches, the appearance may vary, which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.