Design and implementation of wireless transmission management system for water meter data acquisition

Abstract: The design and implementation information of the wireless transmission management system for water meter data acquisition is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abstract: Since the production-oriented enterprises have certain difficulties in the wired network wiring of data meter reading in the whole plant, a wireless networking method is designed to collect data from 50 water meters distributed in a certain plant area. Control room workstation on site. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the design and implementation of the wireless transmission management system for water meter data acquisition. Since the production-oriented enterprises have certain difficulties in the wired network wiring of the data meter reading in the whole plant, a wireless networking method is designed to collect data from 50 water meters distributed in a certain plant area, and through the central control room workstation Display, process, calculate and save field data. Realize the stable operation of the system, complete the statistics and analysis of the flow of production water in production enterprises, realize real-time meter reading, improve production efficiency and reduce production costs. Keywords: wireless data, transmission database, server 1 Introduction The main production water of production enterprises refers to the water directly used in industrial production. The real-time monitoring system is adopted for the water treatment system, which can timely and meticulously understand the changes of water consumption, and it is convenient to take corresponding measures. The user is limited by the geographical environment and work content, which is very inconvenient for the wiring project of wired network and wired transmission. At this time, the use of wireless monitoring can get rid of the shackles of cables, and has the advantages of short installation cycle, convenient maintenance, strong capacity expansion, and rapid cost recovery. The water meter data acquisition and transmission management system introduced in this paper is designed according to the current situation that the outdoor distance of a production enterprise is relatively long and the production and office environment is relatively complete. manage. The system uses electromagnetic flowmeter to collect on-site water flow. There are 50 collection points in total. The plant area is 2km long and 1km wide. All electromagnetic flowmeter signals are required to be collected to the central control room by wireless transmission, and real-time monitoring of electromagnetic flowmeter data is realized on the host computer in the central control room, and corresponding data statistics, report analysis, and historical curves are made. The electromagnetic flowmeter that completes the field data acquisition adopts the TOSHIBATIG series, and the converter is the LF402 type, which can be connected to a GPRS communication module or a wireless data transmission station. Taking into account the current situation of this production enterprise, NH719-1 digital radio is used, VB6.0 is used for the upper data acquisition and processing software, and SQLserver2000 is used for the database to complete the function of timing meter reading. It is required to record the instantaneous flow value and total flow (ie, the cumulative amount so far) of each collection point. 2 Wireless transmission system 2.1 Networking method The system adopts the networking method of master station + slave station, the master station is located in the central control room, and the slave stations are distributed in each water meter field. The system networking mode is shown in Figure 1. Figure 1 System networking method This project uses NH719-1 digital radio, adopts advanced frequency synthesis technology, CPU phase-locked loop control, cooperates with modem, can provide transparent transmission of voice or data signals, adapt to various point-to-point, point-to-multiple It has the characteristics of integrated transceiver, convenient installation, simple use, high cost performance, stability and reliability, and is widely used in various data remote acquisition and control systems. The Radio Administration of the Ministry of Information Industry of the People's Republic of China has specially set up a dedicated frequency band of 223~235MHz for wireless data communication for the SCADA system. According to this, the working frequency of NH719-1 data transmission radio is 230MHz (220~240MHz adjustable), the maximum transmit power is 25W, it can support RS232 and RS485 communication interfaces, and the transmission rate is adjustable (1200/2400/4800/9600b/s). The system master station is located in the central control room. The wireless data transmission station of the main station of the system is responsible for receiving the field data from each sub-station. Then, the data is transmitted to the upper system through the RS232 serial port of the workstation, and the upper system stores and analyzes the data. The system has a total of 50 sub-stations, which are distributed in various water-using places. The wireless data transmission station of the substation is responsible for receiving the real-time data collected by the electromagnetic flowmeter, and then sends the data to the wireless data transmission station of the main station. 2.2 Communication protocol The communication between the master station and the slave station of the system adopts the master-slave scanning communication protocol. Each communication process is initiated by the master, and then the slave responds and returns the specified information to complete a communication process. The information sent by the master to the slave consists of 4 bytes, the first byte is the start code (0x2A), the second byte is the slave address, its code: 0~127 (the highest binary bit is defined separately), the first byte is the address of the slave. 3 bytes are the data classification command, and the 4th byte is the end code (0x2E). After receiving the command information from the master, the slave will return the measurement data according to the command. The slave responds to the master command and sends back 10 bytes of data, which are divided into four parts: command segment, data segment, checksum, and end flag.

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