Design of HCI System in Monitor and Control Centre Based on Dry-type Transformer Temperature Controller

Dry-type transformer temperature controller's work in many different sites outside, which brings inconvenience to the management and operation. The HCI (Human Computer Interface) in monitor and control centre whose function is complete and direct-viewing can be operated simply and eazily and it can manage and operate many temperature controllers just inside the monitor and controller centre instead of outside. Using RISC(Reduced Instruction Set Computer) high speed MCU(Micro Control Unit) ATmega128, a dry-type temperature controller is designde,and then embedding ModBus-RS485 protocol, realizing data communication between 32 temperature controllers and HCI in monitor and control centre. In this way, a realistic and valuable system of temperature control is designed. The hardware design and principle of temperature controller is introduced, main functions of HCI system in monitor and control centre are described and design block diagram of the main program is given, with the introduction of embedded Modbus-RS485 protocol and CRC-16 checking. Practice proves that the whole system which is consists of temperature controller and HCI in monitor and control centre runs well.