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Method and system for automatically detecting fault of RS-485 chip

A RS-485, automatic detection technology, applied in the direction of electronic circuit testing, etc., can solve the problems of inconvenient fault location and maintenance, inability to distinguish the location, etc., to achieve the effect of simple structure and fast detection process

Active Publication Date: 2013-03-13
NANJING SCIYON AUTOMATION GRP
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Problems solved by technology

The traditional RS-485 bus detection tends to detect bus conflicts through additional software and hardware mechanisms, and RS-485 chip damage and communication cable faults cannot be distinguished and located. RS-485 chip damage often occurs in the field of industrial control, which provides system fault location and Maintenance brings great inconvenience

Method used

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  • Method and system for automatically detecting fault of RS-485 chip
  • Method and system for automatically detecting fault of RS-485 chip
  • Method and system for automatically detecting fault of RS-485 chip

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Embodiment Construction

[0018] The RS-485 chip fault automatic detection method and system of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] Such as figure 1 As shown, the RS-485 chip fault automatic detection system of the present invention includes a microprocessor MCU and a programmable logic chip. The RX pin, IO1 pin, RTS pin and TX pin of the microprocessor are respectively connected with the IO_RX pin, IO_ST pin, IO_RTS pin and IO_TX pin of the programmable logic chip. The IO_RO pin, IO_DE pin and IO_DI pin of the programmable logic chip are respectively connected with the RO pin, DE pin and DI pin of the RS-485 chip. The RE pin of the RS-485 chip is connected to the ground through the resistor R2, so that the RS-485 is always in the receiving state; the RO pin is connected to VCC through the resistor R1. The programmable logic chip is composed of a detection module and a logic unit or gate. The detection module is composed...

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Abstract

The invention provides a method and system for automatically detecting a fault of an RS-485 chip. The system comprises a microprocessor and a programmable logic chip. The method comprises the following steps of transmitting an electric signal to the RS-485 chip, receiving and transmitting the electric signal by the RS-485 chip, judging whether the RS-485 chip has a fault or not by detecting the consistency of the electric signal received by the RS-485 chip and the transmitted electric signal; and judging that the RS-485 chip has the fault when the electric signal received by the RS-485 chip and the transmitted electric signal are not consistent. The system for automatically detecting the fault of the RS-485 chip, disclosed by the invention, has a simple structure and a quick and precise detection process, and can effectively and automatically finish and automatically transmit a detection result in a bus communication process without manual intervention.

Description

technical field [0001] The invention relates to an RS-485 chip fault automatic detection method and system. Background technique [0002] With the wide application of RS-485 bus protocol in the field of industrial communication, the use of RS-485 chips is gradually increasing. At present, the reasons for communication failure in the RS-485 network mainly include communication cable failure, bus conflict, and RS-485 chip damage. The traditional RS-485 bus detection tends to detect bus conflicts through additional software and hardware mechanisms, and RS-485 chip damage and communication cable faults cannot be distinguished and located. RS-485 chip damage often occurs in the field of industrial control, which provides system fault location and Maintenance brings great inconvenience. Contents of the invention [0003] The purpose of the present invention is to provide a method and system capable of automatically detecting RS-485 chip faults in order to solve the deficie...

Claims

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Application Information

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IPC IPC(8): G01R31/28
Inventor 沈德明陈闯祖利辉施海庆
Owner NANJING SCIYON AUTOMATION GRP
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