System and method for measuring length of twisted pair based on RS485 bus signal transmission delay

A technology of RS-485 and transmission delay, which is applied in the system field of measuring twisted pair length based on RS485 bus signal transmission delay. The effect of strong ability and flexible method

Inactive Publication Date: 2012-02-22
DATCENT TECH
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Problems solved by technology

[0002] During the signal transmission process of the analog signal through the twisted pair, due to the impedance of the twisted pair, the signal attenuates. In order to restore the analog signal, it is necessary to perform signal compensation processing at the receiving end, but it is usually troublesome to determine the compensation value. The reason is that The impedance of the twisted pair will change with the length of the line, so it is necessary to measure the length of the twisted pair in order to do correct signal compensation

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  • System and method for measuring length of twisted pair based on RS485 bus signal transmission delay
  • System and method for measuring length of twisted pair based on RS485 bus signal transmission delay
  • System and method for measuring length of twisted pair based on RS485 bus signal transmission delay

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Embodiment 1

[0035] The system for measuring the length of the twisted pair based on the signal transmission delay of the RS485 bus in this embodiment includes a sending end and a receiving end, and the sending end and the receiving end are connected through a twisted pair.

[0036] The sending system such as figure 1 As shown, the main processor at the sending end is composed of two sub-modules: one is the waveform sending module, which is responsible for sending the measurement waveform; the other is the timer module, which is responsible for calculating the round-trip time of the waveform, and the 485 receives data to trigger and stop timing. The 485 chip is responsible for processing level conversion and data transfer. The sending end includes the main processor of the sending end and the 485 chip, the main processor of the sending end is connected to the 485 chip for communication, and the 485 chip is connected to the twisted pair; the main processor of the sending end includes a wave...

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Abstract

The invention relates to a system and a system for measuring the length of a twisted pair, which is the system and the method for measuring the length of the twisted pair based on RS485 bus signal transmission delay, comprising a transmission end and a receiving end. The transmission end comprises a transmission end main processor and a 485 chip, the transmission end main processor is communicated with the 485 chip, and the 485 chip is connected with the twisted pair; the transmission end main processor comprises a waveform transmission module and a timer module; the receiving end comprises areceiving end main processor and a 485 chip, the receiving end main processor is communicated with the 485 chip, and the 485 chip is connected with the twisted pair; and the receiving end main processor comprises a receiving end responding module. The invention adopts RS-485 signals as the measuring signal, the RS-485 adopts a way of balance transmission and differential receiving to realize the communication, the receiving end receives the transmission end data to respond the data, and the timer counts the whole process time, thereby calculating the length of the twisted pair.

Description

technical field [0001] The invention relates to a measuring system and method for the length of a twisted pair, in particular to a system and a method for measuring the length of a twisted pair based on RS485 bus signal transmission delay. Background technique [0002] During the signal transmission process of the analog signal through the twisted pair, due to the impedance of the twisted pair, the signal attenuates. In order to restore the analog signal, it is necessary to perform signal compensation processing at the receiving end, but it is usually troublesome to determine the compensation value. The reason is that The impedance of the twisted pair will change with the length of the line, so it is necessary to measure the length of the twisted pair in order to perform correct signal compensation. [0003] In the process of signal transmission through the medium, in addition to the signal attenuation caused by the impedance, there is also a very important feature, that is,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/02H04B3/46G01S11/00
Inventor 甘家富仲健
Owner DATCENT TECH
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