Fourth, author designed test circuit board, signal transfer circuit board, 485 interface and USB HOST interface etc.
第四，设计了检测板、信号中转板、485接口和USBHOST接口等电路。
Fourth, author designed test circuit board, signal transfer circuit board, 485 interface and USB HOST interface etc.
第四，设计了检测板、信号中转板、485接口和USBHOST接口等电路。
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