Abstract: As the embedded systems develop and are widely used,more and more HCI is needed.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 design,whose communication is stable and reliable and program is portable,makes the desired results.

Key words: HCI； Modbus communication protocol； embedded microprocessors； touchscreen；