在单片机开发中，UART、I2C、RS485等普遍在用，对它们的认识可能模棱两可 ... 所以称0为显性，1为隐性。 USB接口最少有四根线，其中有两根是数据线，而所有的USB数据传输都是通过这两根线完成。它的通信远比串口复杂的多。 两根数据线采用差分 ...

Every hacker has an assortment of USB to TTL-serial adapters kicking around in their lab, and we have all been annoyed that each one has a different pinout ... so that each cable is always ...