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

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

Active Publication Date: 2012-10-24
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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Embodiment Construction

[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 with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, and not to limit the present invention.

[0035] The slave node of the present invention can judge whether the RS-485 bus communication is abnormal, and when the communication is judged to be abnormal, it can automatically disconnect the connection with the RS-485 system bus, and use its own IO port with its RS-485 communication circuit For data communication, it can detect whether the RS-485 communication circuit can work normally.

[0036] If the detection is normal, it will automatically connect to the bus. If the detection is not normal, it is no longer connected to the bus. In this way, those slave nodes cannot communicate...

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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. Background technique [0002] RS-485 communication circuit: It is a serial communication circuit that uses balanced transmission and differential reception to achieve communication: the transmitter converts the TTL level signal of the serial port into a differential signal A and B for two outputs, which are transmitted through the cable After that, the differential signal is restored to a TTL level signal at the receiving end. Since the transmission line usually uses twisted pair and is differential transmission, it is also extremely resistant to common mode interference. The bus transceiver has high sensitivity and can detect voltages as low as 200mV. Therefore, the transmission signal can be recovered even from kilometers away. [0003] The Chinese name of MCU (Micro Control Unit) is micro control unit, also known as sin...

Claims

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Application Information

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Patent Type & Authority Applications(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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