Along with computer system's popularization and the auxiliary equipment technology's development, between the computer and auxiliary equipment's correspondence appeared is getting more and more important. And, between the computer and the monolithic integrated circuit the serial port correspondence's application are also getting more and more, because the serial message center uses the transmission line are few, the reliability is high, and may draw support from the ready-made telephone network to carry on the information transmission, therefore, especially qualify in data acquisition and long-distance transmission. Regarding these with the computer close not far person - machine commutation equipment and serial storage's external instrumentation like terminal, the printer, the logical analyzer, the floppy disk and so on, uses the serial mode exchange data to be very also common. This article introduces the serial communication method between pc and single chip processor, then design the interface circuit according to RS232-standard, and gave has realized the asynchronous communication plan, the corresponding software routine as well as an application example under the Windows environment, realized superior PC machine and between monolithic integrated circuit's serial communication, has given the hardware circuit diagram, the communication protocol and the program flow diagram and uses VB to compile the superior machine correspondence software method, as well as part serial communication procedure. This kind realizes the superior machine and the lower position machine serial communication method has the use to be simple, write program convenient characteristic.
