Research And Realization Of Wireless Meter-reading Terminal System Based On GPRS

The electrical energy measurement is an important part in the modern electric power marketing system.The traditional meter-reading and settlement is relaying on manpower regularly to the scene takes the data,therefore low efficiency,high costs, unable to monitor,in real time,in the field of real-time,accuracy and application there are also many shortcomings,has been unable to meet modern city's needs.The Modern Communication Technology and the computer technology as well as the electrical energy gauging quantity technology unifies in together,can promptly, accurately,comprehensively reflect of the use condition of electricity,very good atonement tradition way shortcoming.Therefore,this paper designes one kind of wireless meter-reading terminal system Based on GPRS.This terminal system concentrates the user electric instrument's electric quantity information by the RS485 bus line firstly,then through the GPRS network,the information will be given to the monitoring center by the IP data packet's way,in order to achieve long-range wireless automatic meter reading function.The paper first introduces the principle of GPRS communications technology, network architecture and related theory and technology,designes long-distance meter-reading system composed by the lower position machine terminal,the GPRS communication network and the monitoring center.Uses Siemens GPRS module MC55 to take the design the key point,accomplishs the data transmission function between GPRS and Internet.The paper does the following job mainly in entire system research and design:(1)completed the hardware circuits design and implementation of the master-control unit by PHILIPS Corporation's ARM7 chip LPC2138 and related peripheral.(2)Participate in the Terminal application process and the overall framework of analysis and study,compiled the MC55 part AT instruction code concretely,including codes of FTP download. (3)The use of MC55 FTP download and LPC2138 function of the IAP achieves remote upgrades of the terminal application software to facilitate maintenance.(4)Proposes mutually independent design way of FTP connection and TCP connection,therefore the terminal does not need the master station intervention in the downloading promotion procedure's process,does not interfere with other work.The software and hardware system of the wireless meter-reading terminals designed by the paper pass a series of tests including timeliness reliability of GPRS correspondence.The results of puting into use in scenes prove that the terminals can complete data collection,data processing,data transmission,and other functions accurately and reliably,fully meets the power long-distance monitoring management requirements.