Instrument bus circuit of centralized meter reading system

Abstract

The invention provides an instrument bus circuit of a centralized meter reading system. The instrument bus circuit comprises a power supply module, a sending module, a receiving and current compensating module, an overload protection module, a short circuit protection module and an RS232 data converter, the instrument bus circuit is connected with a concentrator and an instrument through a data line, and the power supply module provides a power supply; the sending module sends concentrator data modulated and converted by the RS232 data converter to the instrument; the receiving and current compensating module receives the instrument data, carries out current compensation on the data, and outputs the compensated data to the RS232 data converter; and the overload protection module and the short circuit protection module carry out overload protection and short circuit protection on the data line. The circuit has the advantages of simple structure, low cost, low power consumption and reliable functions; in addition, the MBUS instrument bus circuit can improve the load ability of a bus, and can greatly simplify the wiring and connection of energy consumption intelligent management systems of residence communities, office places and the like, and is convenient and feasible to construct.

Description

technical field [0001] The invention relates to a meter bus circuit of a centralized meter reading system. Background technique [0002] In the current heating system, the emergence of centralized meter reading technology has aroused widespread concern from all walks of life. Centralized meter reading technology is the result of the integration of computer technology, intelligent control technology, communication technology and embedded technology, and the cross penetration of multiple fields and disciplines. It can realize the remote centralized reading of water meter, heat meter and electric meter data and the remote operation of the three meter terminals, realize the centralized management of data, solve the disadvantages of untimely, wrong and missed reading of traditional manual meter reading, and serve the relevant departments A solid foundation has been laid for the development of informatization. [0003] For a centralized meter reading system, the data transmitted...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the instruments sold on the market still use the RS485 bus mode, but due to the poor anti-interference performance of RS485 itself, and the need to lay special 485 lines, the cost is high; the lines need to be maintained, which increases the maintenance workload, and the power carrier data acquisition Unstable, the terminal is not easy to match, affected by the power consumption situation, it is difficult to guarantee real-time and accuracy during the peak power consumption period

[0005] Some leading meter reading equipment also integrates power carrier technology, and uses the instrument bus (M-BUS) to remotely transmit user data to achieve multi-node, long-distance communication. Interference, the development of the network system and intelligent management of rights and actual use are still not practical, and the reliability is not high

Images