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The socomec 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 either serial communication or parallel communication. Serial communication is widely adopted because it uses fewer lines, has lower costs, and avoids inconsistencies in line characteristics, especially during long-distance transmission. In serial communication, both communicating parties are required to use a standard interface to facilitate the connection of different devices.