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SCI-B对应的是方口USB,SCIA对应的是DB9.
如果用DB9,请注意是交叉线。
建议您还是先用方口USB,包装内自带USB线和电脑连接。不需要在电脑端设置。
如果还是连不上,请更改一下COM口,例如改成COM9,重启上电再尝试,另外,不要和串口调试助手同时使用,否则会出现冲突。