RS485 bus control system and control method of fresh air purifier

Abstract

The invention discloses an RS485 bus control system of a fresh air purifier, for implementing control on more than two fresh air purification slave units mounted in each room of each floor of a building. The RS485 bus control system comprises an RS485 communication bus, and a control main machine and the fresh air purification slave units that are in linear series connection with the RS485 communication bus, wherein the control main machine is at least provided with a control input unit and an all point addressable RS485 bus interface; the quantity of the fresh air purification slave units is matched with the load-carrying capacity of the RS485 communication bus; each fresh air purification slave unit is at least provided with a purification unit, an RS485 expansion interface and a serial number of a load corresponding to the RS485 communication bus; and the control main machine sends a command to one or a part of fresh air purification slave units on the RS485 communication bus, and receives and verifies replies. With the application of the fresh air purification control scheme, centralized control in a specific position is facilitated, fatigue accumulation after experiencing control in various places is avoided, the common-mode interference resisting ability of the RS485 communication bus in the aspect of data transmission is used fully, and the RS485 bus control system is suitable for attenuation inhibition during long-distance transmission.

Description

technical field [0001] The invention relates to a control device for functional devices or equipment, in particular to a control system and control method for centralized control of fresh air purifiers distributed in building space. Background technique [0002] With the continuous development of the manufacturing industry and the continuous improvement of the environmental requirements for modern working spaces, more and more manufacturing workshops and warehouses need to be equipped with fresh air systems like offices to increase the speed of air exchange in an artificially controllable way. Protect the health of workers in a specific area and avoid personal injury accidents caused by the invasion of hazardous air. However, whether it is a family, a commercial residence or a manufacturing plant, a large part of the installation of the fresh air system is carried out during the decoration process, and the structure and method of wired control are generally selected, and the...

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Problems solved by technology

[0004] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to propose a RS485 bus control system and its control method for fresh air purifiers, so as to solve the problem of centralized operation and control of fresh air controllers.

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