Use Nanjing Qinheng Microelectronics' USB to serial port chip CH9340K, which is also compatible with CH340K. CH9340K is driver-free under Win10. The board design can be placed into the DB9 casing, with Type-C pads reserved, and Type-A and Type-C can be freely selected. Equipped with TX/RX crossover jumpers to easily adapt to the wire sequence required by the docking device.
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