The schematic diagram is modified based on the CH9344EVT schematic diagram on the WCH official website, link: USB to 4 serial port chip CH9344 - Nanjing Qinheng Microelectronics Co., Ltd. (wch.cn)
Use an isolated power supply and isolation module to reduce interference to the target board, and use diodes to isolate the serial port to prevent current backflow and power supply to the target board.
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