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RS485 line status monitor and monitoring method

A kind of RS485, 1. RS485 technology, applied in the field of RS485 line status monitor and its monitoring, can solve the problems of inability to protect indication and monitor and record the working status of the bus

Inactive Publication Date: 2012-07-04
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the working state of the bus cannot be protected and indicated, monitored and recorded when the RS485 bus and the power line are short-circuited in the existing RS48 application, and a RS485 line status monitor and its monitoring method are provided

Method used

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  • RS485 line status monitor and monitoring method
  • RS485 line status monitor and monitoring method
  • RS485 line status monitor and monitoring method

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specific Embodiment approach 1

[0037] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment mode, a kind of matrix switch control system that supports four working modes of the present invention, it comprises 24VDC-DC converter 1, 5VDC-DC converter 2, first lightning protection and surge protection module 3, second Lightning and surge protection module 4, first self-recovery insurance module 5, second self-recovery insurance module 6, first line switch module 7, second line switch module 8, first RS485 isolation transceiver 9, second RS485 isolation Transceiver 10, data direction control module 11, main controller 12, display and indicator light module 13, clock module 14, memory module 15, first A / D acquisition control circuit 16, second A / D acquisition control circuit 17 and Two sets of signal processing units;

[0038]The input terminal of the 24VDC-DC converter 1 is connected to the positive pole +24V2 of the first +24V power supply and the power ground GND2; the ou...

specific Embodiment approach 2

[0068] Specific implementation mode two: combination image 3 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is that the RS485 line status monitor also includes a 14AH battery 23 and a battery management module 22; the output end of the 14H battery 23 and the input end of the battery management module 22 connected, the port of the battery management module 22 outputs +5V power.

[0069] When the external input power supply is short-circuited, open-circuited or has no power, the battery management module converts the 12V battery into 5V power supply to provide power for the internal circuit.

[0070] 14AH battery module 12V storage battery, to ensure that the internal power supply is normal in the case of external power supply failure, and keep it working normally for 24 hours.

specific Embodiment approach 3

[0071] Specific implementation mode three: combination Figure 4 Describe this embodiment, the difference between this embodiment and specific embodiment one is that the signal conditioning circuit 19 includes a resistor voltage divider network 24, an instrumentation amplifier 25 and an operational amplifier network 26; the signal input terminal of the resistor voltage divider network 24 is used as a signal conditioning circuit The signal input end of 19, the signal output end of resistance divider network 24 is connected with the signal input end of instrumentation amplifier 25, the signal output end of instrumentation amplifier 25 is connected with the signal input end of operational amplifier network 26, the signal output of operational amplifier network 26 terminal as the signal output terminal of the signal conditioning circuit 19.

[0072] The signal from the line, in order to ensure that the sampling circuit does not affect the line itself, first passes through the condit...

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Abstract

The invention relates to an RS485 line status monitor and a monitoring method and aims to solve the problem that the working status of a bus cannot be protected, indicated, monitored and recorded when short-circuit occurs in the RS485 bus and a power wire in the conventional RS48 application. Due to a lightning-proof surging-preventing module, a self-recovered insurance module, a first line switch module, a second line switch module and an RS485 isolated transceiver, the RS485 line status monitor has the effects of surging protection, lightning protection, RS485 relay, isolating, recording and power failure protection; under the conditions of short-circuit in the power supply and the ground or open circuit in the power wire and the ground wire, the failure is indicated and recorded and the non-failure parts of the line are protected; and under the failure condition and within certain time, normal operation of equipment serving as RS485 relay, isolating and recording functions is guaranteed. The RS485 line status monitor is used for monitoring the RS485 line status.

Description

technical field [0001] The invention relates to an RS485 line state monitor and a monitoring method thereof. Background technique [0002] At present, the RS485 bus is widely used as the physical layer channel of equipment data communication in industrial applications. Its wiring is often set together with the power line in the indoor or mine, that is, the power line, ground line, RS485+, and RS485- are set together. In actual In the application, many devices are generally mounted on the RS485 bus. When a communication failure or power failure occurs in one of the devices, a short circuit often makes the entire bus unable to work. In severe cases, it damages other non-faulty devices on the bus, making the overall system Reliability and fault tolerance are greatly reduced. At present, when the RS485 bus and the power line are short-circuited in the RS48 application, the working status of the bus cannot be protected, indicated, monitored and recorded. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/08G01R31/02G01R31/08
Inventor 曹一江马宁王建民杨路清崔倩
Owner HARBIN UNIV OF SCI & TECH