The application of remote meter reading system problems and development trends –
HC Network Security I. INTRODUCTION Ministry of Construction in the "Program for the Development of Chinese domestic products" made it clear: to achieve easy look-up table, do not interfere with tenants to work a lot of manual look-up table and gradually transition to digital transmission, development of intelligent water, electricity, gas, Metering Device and interface cabinet. With electronic technology, sensor technology, automatic control technology, computer technology and communication technology, remote meter reading system has been Intelligent Community Gradually spread.
2, remote meter reading system theory and composition of the remote meter reading system, the basic working principle is the use of electronic technology and sensor technology, the traditional Electric meter , Water meter, gas meter to be improved, making it the Remote Meter, a metering system installed outdoors, the metering sensor for each outgoing data sent to the collector of each table storage, delivered through function transformation Smart circuit unit, each unit through the parallel data bus, data bus at any point in all communication with the computer, automatic Collecting 3 Table Data. Remote detection of remote meter reading system from the header, data acquisition, host controller, meter reading and meter reading system, server software of five parts.
1, Remote detection of the header on the current meter, water meter, gas meter installation of sensors, to both display measurement data in situ, can generate the relevant measurement pulse signal. Sensor is essentially a conversion technology based on magnetic or optical conversion technology pulse circuit unit. Remote detection of the first mechanical rotary table, the magnetic induction Probe Checklist head mounted on a scale, and the external magnetic field through the magnetic shielding to prevent interference, can be converted into a common table header Remote detection. The number of cycles axis component output by the probe sent to data acquisition, the data rate calculated by a certain measurement data has become final. For example, in the current count of the water meter in the installation of dial Hall element and the magnet, you can form conversion technology based on magnetic sensor, Hall-iron plate installed in the count, when the wheel each turn, a permanent magnet through the Hall components once, in the end that produces a signal corresponding to the measurement of pulse, the voltage provided by the collector. Similarly, you can measure with photoelectric conversion technologies used to produce pulses, to achieve the purpose of remote meter reading.
2, the data collector is a single-chip microcomputer as the core of the data acquisition device for detecting the header of data collection, cut line Alarm , Real-time data storage, and the host controller communications, generally installed in the households near the test header. Its main function is to collect test data in the header, the header data accumulated through the system bus From first position controller. It generally has four or eight channels, each channel connecting a test header. To protect the system Security And reliability, data acquisition system should have the bottom of the table data and collecting data storage capabilities, while users should be cut line, the system bus disconnection, power failure alarm functions. Data acquisition is usually installed in the vicinity of the test header, like: can focus on the same floor of the collector installed on the shaft of the weak layer. Data Acquisition System to provide centralized power from the UPS.
3, host controller is an independent meter reading system, terminal device, to provide UPS power. Host controller with data acquisition, testing the composition of the full header of small-scale meter reading system, the standard host controller can be articulated through the shielded twisted pair data collector 255, by extending the host controller interface can be articulated without limit the number of data acquisition, but should ensure that lines of communication does not exceed the total distance 1km. Host controller main functions are: data acquisition hardware device management, historical data storage, accumulation, automatically download the data collector, data display, printing, proofing, system maintenance, user password settings, user billing management, data sharing capabilities. Host controller provides a rich interface, can connect the printer, monitor, keyboard, mouse, network cards, USB devices. For smaller communities, may be replaced by host controller meter reading meter reading server to complete the mission district.
4, meter reading meter reading system server is a large community of network management server, for large, communication line total distance of more than 1km of the district, should be an additional meter reading server, host controller using the Ethernet connection, meter reading In addition to functions of network management server, the other functions with the same host controller.
5, meter reading system software for data storage, processing, analysis, application software, with automatic data acquisition, data query, data modification, data communication, data printing, maintenance, fees management.
Third, remote meter reading system functions and features of remote meter reading system has the following three functions
First, the user has an independent processing, the user has run independently, will not interfere with each other and the system is connected between the bus data loss caused by short circuit or open circuit and confusion, ensure that the Collecting timely, accurate data (and detection header data consistency);
Second, with alarm, if the user cut line, equipment, communications interruption, power outages and other phenomena, the system will automatically alarm; third, with anti-power features, power failure, the system's standby power to ensure that the system in the 72 hours, safe and reliable work history data can be kept more than 30 days.
Remote meter reading system has the following two characteristics:
First remote meter reading system is a modular open network, the system connected by bus mode, the user and connected to the bus, can be copied from any point in the line read three tables of data, to facilitate the entire district and urban water network, gas network, the grid automatically Collecting, bank transfers receivables, may form a large network of more than 1 million;
Second is composed of a flexible system, both for small communities, reduce the cost of independent residential meter reading system, but also for the larger community, network management, meter reading system functions well. Remote meter reading system performance indicator is to test the header that water meter, electric meter and gas meter and other measuring instruments, meter reading system was used to analyze the header need to join the probe components, and is equipped with a signal transmission line, its length is less than 1.5m. Detection of modified headers were to meet GB/T778.1? 3-96, GB/T15283? 94 and GB6968? 86 requirements (the above three criteria were water, electricity, gas meter national standards).
Fourth, the application of remote meter reading system and development trends
Along with the "Comfortable Housing Project" campaign, intelligent residential building, remote meter reading system in Wenzhou have multiple buildings and residential use, such as the Dragon Tower, Tower south of Zhejiang, Longquan apartments, the city spent in South Asia
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