By analyzing the technology transform demands and control principle of the air compressor station,a detailed design plot of air compressor station control system based on FX serial PLC,inverter and MODBUS communication is introduced,including hardware design,program design,and communication realization,etc.

The paper proposed a design scheme of Modbus RTU communication based on CP341,gave the selection and configuration of hardware and software,and introduced the design of data communication program between CP341 and intelligent sensor.

After introducing the Modbus communication protocol and HCI structure and composition,this paper designs the communication methods between embedded microprocessors and MT500 series touchscreen,based on Modbus communication protocol.

This paper puts forward a design scheme of the collection and process system based on the pressure transducer signals,talks about that the system can make sampling of the output signals of the transducer and transform them into the word signals taking the AVR microcomputer as the core,and expounds the software flow and Modbus communication protocol.

Application of MODBUS protocol in the supervisory control system of low voltage power distribution;

A study on Modbus protocol is given,which is applied in the internal communication of ABT(Automatic Bus Transfer) and the communication between ABT and its superordinate station.