Implementation of Modbus Communication Protocol based on ARM Coretx-M0

Power plant control of the embedded data acquisition system had been developed from centralized control, distributed control into fieldbus control. The paper puts forward a design program combining Modbus communication protocol with 32-bit ARM Coretx-M0 microprocessor as its core. The overall design scheme of the system and the content of Modbus Communication Protocol are introduced while the circuit interface of RS485 is given; The embedded real-time operating system μC/OS-II implements the communication between master station and slave station based on Modbus RTU communication protocol, and discusses the generation of Cyclic Redundancy Check in the Modbus Communication Protocol. Experiments show that system is able to implement the data acquisition and transmission reliably.