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Application Of Remote Monitoring System
Jun 12, 2017

Remote monitoring system mainly involves five major aspects, namely the core of the video codec, network transmission, UI design, server (mobile streaming media) and with other systems.

The development of information technology has changed people's way of life and work habits, is conducive to the traditional management methods and means to replace and upgrade. Remote monitoring system in the city gas business users on the application of the management, IOT Based Remote Monitoring and Control System changing the traditional time and laborious manual meter reading way. This paper analyzes the technical support and corresponding data service provided by the remote monitoring system for the gas enterprise in the management of the city gas business users from the aspects of communication technology, concrete scheme design and practical application.

Communication technology of remote monitoring system

The remote monitoring system is an information system that uses the specific communication method to transmit the intelligent flow meter data of the end user to the computer network of the remote control terminal, and the data is statistically analyzed, analyzed and calculated by the software. At present, the domestic communication technology used for remote monitoring mainly includes: cable bus communication, IOT Based Remote Monitoring and Control System optical fiber communication, telephone line communication, power line carrier communication, wireless communication, satellite communication, cable television communication, cellular communication and other means. What kind of communication, need to take into account the system to face the user object, distribution, quantity, geographical conditions, economic conditions, system upgrades, and compatibility with other networks. IOT Based Remote Monitoring and Control System The following three kinds of commonly used communication methods for analysis.

① RS485 bus communication

In the wired bus communication, the most commonly used for RS485 bus communication. RS485 bus using twisted-pair differential transmission can be connected to half-duplex and full-duplex two communication methods, the maximum transmission distance of about 219 m, in fact up to 3 000 m, the maximum transmission rate of 10 Mb / s, The differential input range is -7 ~ + 12 V. The receiver input sensitivity is ± 200 mV, the input impedance is greater than or equal to 12 kΩ, and the standard contact is 32. To accommodate more nodes, the input impedance of some chips is designed to be 1/2 load (input impedance greater than or equal to 24 kΩ), 1/4 load (input impedance greater than or equal to 48 kΩ), 1/8 load (input Impedance greater than or equal to 96 kΩ), the corresponding node can be increased to 64,128,256. RS485 bus communication mode is the advantages of mature technology, simple, reliable, stable, IOT Based Remote Monitoring and Control System real-time communication can be achieved; the shortcomings of the wiring workload is large, the communication channel vulnerable to man-made damage, easy to damage, damage to troubleshooting difficulties, Subsequent maintenance is large.

②CAN bus communication

Controller Area Network (CAN) is a serial communication protocol bus for real-time applications. It can transmit signals using twisted pair, which is one of the most widely used field buses in the world. Mainly used for a variety of process detection and control. CAN protocol features include complete serial data communication, providing real-time support, transfer rates up to 1 Mb / s, with 11-bit addressing and error detection capability. The advantages of real-time strong, far away from the transmission, anti-electromagnetic interference ability, low cost, error detection ability, can work in high noise interference environment, IOT Based Remote Monitoring and Control System with priority and arbitration function, a number of control modules through the CAN controller To the CAN-bus, the formation of multi-host local network;

③ optical fiber communication

Optical fiber communication as a new technology, in recent years the rapid development of a wide range of applications, is an important symbol of the world's new technological revolution and the future information society in a variety of information transmission tools. Optical fiber communication is based on light as the information carrier, fiber as the transmission medium. In principle, the basic material elements that make up optical fiber communication are optical fiber, light source and photodetector. Its advantages are large communication capacity, IOT Based Remote Monitoring and Control System transmission distance, signal interference is small, good confidentiality, anti-electromagnetic interference, good transmission quality, no radiation, difficult to eavesdrop. The disadvantage is that the bending radius of the fiber optic cable can not be too small (> 20 cm) and the cost is high.