The Design Of Heat Remote Metering System And Inteligent Network Calorimeter

With the rapid development of network communication and automation technology, the heat remote metering system will instead of the traditional IC card metering system. It will be applied to the remote meter reading of intelligent community to make heat supply reach informationization and intelligentization. Therefore, this paper designs a intelligent calorimeter to measure community customers' heat consumption remotely. Every intelligent calorimeter composes of a computer dynamic monitoring network. The monitoring center monitors intelligent network calorimeter by real-time data transmitted on the dynamic monitoring network.Firstly, this paper introduces the developing status quo of heat metering technology, and demonstrates the system's whole structure. The main content studied and the key technology solved is described based on the main problems existing in the present heat remote metering system.Secondly, this paper narrates inner hardware structure of intelligent network calorimeter based on low power consumption MSP430F147, and metering and computing methods of key parameters. This paper designs the customer intelligent network calorimeter and the hardware circuit of RS-485 bus connected with the muster. This paper stresses parts of peripheral circuit design of comparator and slope A/D converter using MSP430 singlechip. Moreover, this paper establishes the communication protocol of the system, and writes its software.Thirdly, this paper narrates design thought and composing of intelligent network calorimeter software. This paper writes main program, interrupt program, subprogram and flow chart of each program. This paper gives some modules program, and establishes the communication protocol between the muster and the intelligent network calorimeter.Fourthly, this paper narrates hardware structure of muster, especially the power and memorizer. This paper introduces the principle and connecting methods of GPRS wireless network and GPRS wireless connecting module DTU. This paper establishes the communication protocol between muster and monitoring center, and designs the remote control from monitoring center to muster.Fifthly, the monitoring center is the important part of remote metering system, and whole system carry out the information process and management operation by it. This paper narrates realization methods of communication between monitoring center and GPRS DTU. Using VB and ACCESS, this paper designs GPRS testing software of the system and the operating screen of remote metering system's monitoring center.Finally, referring to the main error phenomenon of the system such as the controlled objects' error action, no response, states' unstability, not accurate timing, digital display confusion or flicker and so on, this paper discusses the methods to improve reliability of singlechip application system from the hardware and the software. At the end of this paper, the test and identification of intelligent network calorimeter are carried out. This paper also tests the power consumption parameter of the calorimeter.