基于MODBUS协议的PLC与RFID电子标签通信方式的研究

摘要

通过对RFID电子标签无线通信场强值的检测,可使RFID标签作为一种定位传感技术应用于工业控制中,从而拓展其应用方式.本文主要介绍RFID作为定位传感器使用时,MODBUS协议在RFID电子标签主控芯片MSP430中的移植,从而实现PLC与RFID电子标签基于MODBUS协议的通信.实践证明,将此通信协议应用于列车自动装卸控制系统,大大的提高了系统通信的可靠性,使列车自动装卸定位准确无误.%Measuring the RSSI value of a RFID electronic tag can be used in industrial control as a kind of locational sensing technology,so as to expand the application area of the RFID.This paper mainly introduces the MODBUS agreement transplants on the MSP430 to achieve the communication between PLC and RFID electronic labels under the MODBUS agreement.Practice has proven that using this communication protocol in automatic loading and unloading control system of the train can improve the fix position precision of the system and make it more effective.