The Vending Machine Monitoring System Based On Gprs Design And Realization

In the same area, as the number of vending machines increases, some new problems of management emerge. So the traditional operation methods of vending machine can not meet the demands. This paper designs and achieves the vending machine monitoring system based on GPRS that can meet.Based on the research of vending machines at home and aboard, this paper designs the whole structure of vending machine monitoring system based on GPRS, and designs the communication terminal of the vending machine, the monitoring system of the monitoring center and the communication protocol between them.Firstly, with the communication terminal of the vending machine, the terminal of the vending machine and the monitoring center can communicate with each other. The terminal uses the GPRS DTU provided by Siemens, which only supports the interface of RS232, and automatic sale communicates with peripheral equipments with the MDB/ICP protocol, so this paper designs the bus interface to realize the conversion between the protocols.Secondly, based on the research of C/S and B/S, referring to their advantages and disadvantages, the paper designs the monitoring center on the basis of the structure of C/S+B/S, whose task is receiving the information of the vending machine's status, sending the information of remote control and show the relative data.Thirdly, analyzed the imperfections of ask-and-answer mechanism or circular mechanism, on the basis of the combinative regulations of the above two mechanisms, this paper mainly designs the communication protocol of vending machines and monitors on the basis of ask-and-answer mechanism and the initiative communication mechanism. Besides, the paper tests the highest rates that the data can reach, the accuracy of the data which have reached, and the delay of the data in different time periods, in different lengths of data packets, in different sending frequency, respectively, and the results show that the system can satisfy the actual demands.In all, this system helps the operators manage effectively, which not only improves service level and quality, but also reduces the operating costs.