Self healing ring RS485 bus structure with short circuit and circuit break prevention

Abstract

The invention discloses a self healing ring RS485 bus structure with short circuit and circuit break prevention in the field of signal transmission. The structure comprises a control center and a plurality of monitoring modules. The control center is connected with the plurality of monitoring modules through an RS485 ring bus. The structure is characterized in that two driving interfaces of the RS485 ring bus are electrically connected with a control center CPU through multiple paths of either-or data selectors. The structure has the advantage of simple construction, single bus, double redundancy bus, ring bus, and logical bus structures are optional, and the working of the system is not affected by faults (short circuit and circuit break) at any position.

Description

technical field [0001] The invention belongs to the field of signal transmission, in particular to an RS485 bus structure. Background technique [0002] In the monitoring, access control, and alarm industries, in order to upload the sensing information of dozens or even hundreds of monitoring points, the RS485 bus is mostly used (see figure 1 ). The bus is simple in form and low in cost. [0003] Although the RS485 bus is simple, the problems it brings are: 1. Any line failure will cause the entire network to be paralyzed, especially when two communication lines are short-circuited, the consequences are more serious; Hundreds of loads sometimes cause communication abnormalities, and sometimes good and bad phenomena occur; 3. The larger the network, the more serious the interference and other problems, and the more difficult it is to find the fault point. [0004] In order to solve the above problems, RS485 dual bus appeared again (see figure 2 ), RS485 ring bus (see i...

AI Technical Summary

Problems solved by technology

[0003] Although the RS485 bus is simple, the problems it brings are: 1. Any line failure will cause the entire network to be paralyzed, especially when two communication lines are short-circuited, the consequences are more serious; Hundreds of loads sometimes cause communication abnormalities, and sometimes good and bad phenomena occur; 3. The larger the network, the more serious the interference and other problems, and the more difficult it is to find the fault point

Although the ring bus method solves the problem of short circuit and open circuit, it is not suitable for the instant alarm system because of the internal relay transmission, which is relatively slow.

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