Research on Modbus Bus Protocol Implementation Technology Based on Single Chip Microcomputer

摘要

Field bus is one of the hotspots in the development of automation field, which is known as the computer LAN in the field of automation. In this paper, a single chip network platform is created. It realizes the communication between PC and MCU. In order to achieve the purpose of using PC control MCU. Modbus protocol is a liaison carrier. The single chip microcomputer is the "Master - slave" device of the slave. KeilC51 software is used to complete program compilation and compilation. Then, the program is imported into SCM by PZ-ISP downloading software automatically, and debugging is implemented under Modbus Master debugging software, so as to realize the construction of software platform. The Modbus protocol itself is a protocol built on serial communication. The serial port uses TX data lines to send data and receives data through the RX data line. The Modbus protocol is transmitted through the information displayed on the LCD display panel on the single chip microcomputer.