This paper introduces RS-232 as an example.Ĭ + + Builder is a product of Borland company. There are two kinds of common serial communication modes, RS-232 and RS-485. It can be seen in the computer hardware device manager that it is defined as COM1, com2, etc. Serial port (RS-232) is a standard configuration on the computer, which is often used to connect the modem to transmit data. Serial communication has always occupied an extremely important position in the field of industrial system control. To ensure the normal communication between computer and PLC, we must write communication program according to its communication protocol. Each communication mode has its corresponding communication protocol strictly. Computer serial communication is the basic communication mode of data transmission between computer and control equipment (PLC), and it is also the communication mode often used to realize industrial automatic control.
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