Research of communication between touch screen and TMS320F2812 based on MODBUS protocol

For reliable and direct communication between touch screen and TMS320F2812,the serial communication based on MODBUS protocol is studied.The hardware of the communication system is composed of TP760-T touch screen with standard RS232/485 interface and TMS320F2812 DSP with SCI.The touch screen is host computer and DSP is slaver in the communication system.The software of the communication system is pro-grammed by the data transmission format of MODBUS RTU.Through experiments verification,the results show that communication speed can be more than 9 600 bps and the data transmission communication system is stable,reliable,high real-time and can be used for man-machine interactive control.