Novel detecting and isolating system for fault of RS-485 port and method thereof

A RS-485, fault detection technology, applied in transmission systems, digital transmission systems, data exchange through path configuration, etc., to achieve the effect of saving workload and facilitating follow-up maintenance

Active Publication Date: 2014-07-16
临沂市拓普网络股份有限公司
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Problems solved by technology

[0006] The object of the present invention is to provide a kind of novel RS-485 bus system and its application to carry out the method for fault detection and isolation, thereby solving the aforementioned problems existing in the prior art

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  • Novel detecting and isolating system for fault of RS-485 port and method thereof
  • Novel detecting and isolating system for fault of RS-485 port and method thereof
  • Novel detecting and isolating system for fault of RS-485 port and method thereof

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[0034] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0035] The slave node of the present invention can judge whether there is an abnormality in the communication of the RS-485 bus, and when it is judged that the communication is abnormal, it can automatically disconnect the connection with the RS-485 system bus, and communicate with the RS-485 circuit through its own IO port Carry out data communication, so as to detect whether the RS-485 communication circuit can work normally.

[0036] If the detection is normal, it will be automatically connected to the bus. If the detection is not normal, it is no longer connected t...

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Abstract

The invention provides a novel detecting and isolating system for a fault of a RS-485 port, which comprises a bus and a plurality of slave nodes connected with the bus, wherein each of the slave nodes comprises an RS-485 communication circuit, an MCU (Micro Controller Unit) and a relay; the MCU is connected with a normally opened end of the relay and the RS-485 communication circuit; and the relay is connected with the RS-485 communication circuit and an RS-485 bus. The slave nodes of the novel detecting and isolating system for the fault of the RS-485 port can judge whether the RS-485 bus communication is abnormal or not. If the communication is abnormal, the slave nodes can automatically disconnect from the RS-485 system bus and can carry out data communication with the RS-485 communication circuit through IO ports of the slave nodes, so as to detect whether the RS-485 communication circuit can normally work or not.

Description

technical field [0001] The invention relates to the field of bus control, in particular to a novel RS-485 port fault detection and isolation system and method thereof. Background technique [0002] RS-485 communication circuit: It is a serial communication circuit, which uses balanced sending and differential receiving methods to realize communication: the sending end converts the TTL level signal of the serial port into differential signals A and B, which are transmitted through cables Then the differential signal is restored to a TTL level signal at the receiving end. Since the transmission line usually uses a twisted pair and is a differential transmission, it has a strong ability to resist common-mode interference. The bus transceiver has a high sensitivity and can detect a voltage as low as 200mV. Therefore, the transmission signal can be recovered even kilometers away. [0003] The Chinese name of MCU (Micro Control Unit) is a micro control unit, also known as a sing...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/24H04L12/40
Inventor 王栾宝李磊巴布卡纳恩古玛
Owner 临沂市拓普网络股份有限公司
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