After one USB input, four USB channels are expanded through FE1.1S, which are converted into serial ports through four CH340C, and then converted into corresponding outputs, with sending indicator lights, with anti-surge, and without isolation. //200902 Successful, communication is normal, some problems have been fixed, DB9 needs to use a male connector, 4148 needs to be short-circuited, and the file has been modified. ----------200823-------- The PCB welding is completed, but the 232 chip is not available, so it is empty. The test video is at station B https://www.bilibili.com/video/BV1tv411i7iX/ Here is a high-definition picture (picture .CR2 is attached) (the board is not washed)
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