Application of Modbus TCP Protocol in Intelligent Signal Transducer

According to industrial needs,this paper designed an embedded intelligent data transmission instrument based on Modbus protocol.The CPU adopted C8051F series microprocessor,the upper and lower computer realized communication through the RS-485 bus.The lower computer adopted C programming language,through the ADC and pulse width modulation function to realize data collection and conversion,PC used C# to develop Modbus protocol communication software,used the main mechanism of urban-rural benefit readjustment and process to realize data communication based on Modbus protocol.It displays data in the host computer interface,while draws data on the dynamic graph,it is a convenient and practical system as a whole.