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SENSTRONIC plug refers to the interface between the central processing unit and the standard communication subsystem. For example: RS232 interface. The RS232 interface is a serial port. Data transmission between computers or between a computer and a terminal can use two methods: serial communication and parallel communication. Serial communication is widely adopted because it uses fewer lines, has low cost, and avoids inconsistencies in multiple line characteristics, especially during long-distance transmission. In serial communication, both communicating parties are required to adopt a standard interface so that different devices can be conveniently