Electronic Tags Assisted Picking System Preliminary Design And Research

The thesis mainly studies theories, methods and technologies in the fields of automation of goods flow., including the following: theory and technologic criterion of RS485 bus, communication theory of network, the constitution and theory of singlechip system, nonvolatile storing technology of data, man-machine interactive technology of singlechip, as well as the theory and method of communication with serial port in PC, technology of developing Windows application ,the technology of designing database, etc. And an elementary assistant system of goods picking is built. In the system we carry out far distance communication by 485, form a communication network which has one host and many slave machines, by means of the network the controlling PC machine communicate with mass electronic labels. Master-slave and half-duplex communication is used in the network, and the form of data packet is adopted in communication. Checking and resending mechanism of data packet is used for realization of reliable communication in the system. At the same time the communication advantage of singlechip's serial port is fully taken in the communication protocol, sequentially the quantity of byte in data packet is reduced, the amount of data in communication is decreased, too.In the research of the thesis, we make the most of modularization design idea and method of design from top to bottom, use advanced programming tool and program language to develop software of the system. The whole research and design has come through the following stages: design of system scheme, design of hardware and software, and system test.After the research of the thesis, we elementarily build up a suit of assistant system of goods picking, now the system has the following functions: managing and controlling electronic labels, processing orders to some extent. The system ischaracterized by high flexibility and good adaptability. With the perfection and maturity of the system, it will have a good future in the automation of goods flow. At the same time, the system model and the foundation of 485 network can also apply in other fields, such as far distance communication, distributed controlling, etc.