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Method for quickly testing recommended standard 485 (RS485) bus breakdown

A technology for RS485 and bus faults, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as inability to accurately locate faults and low efficiency

Inactive Publication Date: 2013-05-08
贵州英特利智能控制工程研究有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The efficiency of this method is still very low, and it is impossible to accurately locate the fault

Method used

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  • Method for quickly testing recommended standard 485 (RS485) bus breakdown
  • Method for quickly testing recommended standard 485 (RS485) bus breakdown
  • Method for quickly testing recommended standard 485 (RS485) bus breakdown

Examples

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Embodiment Construction

[0017] This embodiment is an example of using the method and equipment of the present invention to quickly detect the two-wire RS485 bus used in a certain parking lot.

[0018] In the intelligent parking lot management system, in order to detect whether the parking space is in use, a parking space detector is installed in each parking space, and a certain number of parking space detectors are connected to the host RS485 bus (the number is related to the RS485 chip used) , generally 32, 64, 128, 256 or 400).

[0019] Assume now that 32 parking space detectors with the detectors of the present invention are connected under the same bus, and the 5th parking space detector RS485 chip is damaged and the whole bus cannot communicate.

[0020] Using the dichotomy provided by this method, the detection steps are as follows:

[0021] (1) Use the controller to control the 16th detector in the bus to cut off the bus, scan the first 16 parking space detectors through the host computer, b...

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Abstract

A method for quickly testing a recommended standard 485 (RS485) bus breakdown is characterized by comprising detectors and detection equipment of the detectors for use. The method includes the steps: firstly, enabling the detectors to be installed on each node of the RS485 bus which needs to be detected in a series connection mode, wherein each detector has different addresses and a controller can control multiple detectors; and then enabling the sum of the nodes on the bus to be arranged into N; and next, adopting dichotomy, first using the controller to send a control signal to the detectors at the positions of N / 2 bus nodes and cutting the bus at the position of the N / 2 bus nodes; and then checking whether the breakdown still exists, if judging that the breakdown occurs at the position of N / 2 nodes which are close to a host machine, reusing the dichotomy in the N / 2 nodes at present, and by parity of reasoning, until determining a breakdown point.

Description

technical field [0001] The invention relates to a fault detection method, in particular to a rapid detection method for RS485 bus faults. Background technique [0002] The Electronic Industry Association EIA formulated and released the RS-485 standard in 1983. This standard was created to make up for the shortcomings of RS-232 such as short communication distance and low speed. RS485 has high noise suppression, wide common mode range, low cost, Low development difficulty, long transmission distance (up to 1200m) and other characteristics. RS485 has two types of wiring, two-wire system and four-wire system. The four-wire system can only realize point-to-point communication. Now, the two-wire system is mostly used. One line of the two-wire RS485 bus is A, and the other is A. The root line is B, the two-wire system is one master and multiple slaves, and the transmission mode is half-duplex. Multiple slaves (nodes) can be connected to the bus, and each slave is distinguished by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26
Inventor 周静张厚武姚凯学张勇刘光林
Owner 贵州英特利智能控制工程研究有限责任公司
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