RS485 bus/node protector and method thereof

Abstract

The embodiment of the invention discloses a method and a device for an RS485 bus/node protector. The protector is used for protecting secure connection between a subordinate bus and a superior bus and secure connection between equipment and the bus, and an independent protection mechanism is provided. When the protector is connected between a node and the bus or between the subordinate bus and the superior bus, if the connected node and the subordinate bus connected with the protector fail (short-circuit, damage or abnormality), the bus with the node or the superior bus is not affected. In addition, the accuracy of the line sequence of an RS485 bus of equipment can be automatically detected, so that a reversely connected bus is automatically overturned to an accurate line sequence. According to the protector, an automatic protection function, an automatic starting function and an automatic overturning function are realized.

Description

technical field [0001] The invention designs and develops the protection equipment for the widely used RS485 bus / node in the field of electronic information technology. Connect it between the RS485 device and the bus, or between the lower-level bus and the upper-level bus, to protect the level bus where the device is located from being unable to communicate normally due to the RS485 abnormality or short circuit at the device end, and also to protect the previous level RS485 bus The damage or short circuit will not affect the normal communication of the last RS485 bus. Background technique [0002] In the RS485 multi-level bus system or single-level bus system, if a device in the single-level bus system is short-circuited or fails, the single-level cannot communicate normally due to the differential transmission characteristics of RS485; A device in the system is short-circuited or fails, resulting in the failure of normal communication in the multi-level bus system. The em...

AI Technical Summary

Problems solved by technology

[0003] When the RS485 fails, the maintenance / repair personnel need to detect and eliminate each RS485 device one by one, which is not only cumbersome and heavy workload, but also the problem of one device causes other devices on the network to fail to work normally, and each branch device needs to be checked separately Carry out maintenance and find the faulty device before restarting the operation of the device on the bus

[0004] It is under this demand that the invention was born, and there is no similar product in the market

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