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工业或消费类产品应用中,通常需要和外部低速设置通信。串口是经常使用的设备之一。串口一般又有不同电平的区分,RS232,RS485,RS422。In industrial or consumer product applications, it is often necessary to communicate with external low-speed settings. Serial port is one of the frequently used devices. There are generally different levels of serial distinction, RS232, RS485, RS422.