High-speed RS485 energy/data transmission terminal

A data transmission terminal, RS485 technology, applied in the direction of digital transmission system, transmission system, electrical components, etc., can solve the problems of RS485 high-speed data transmission technology, signal distortion, intersymbol interference, etc., to improve data transmission rate, The hardware circuit is simple and the effect of flexible control
CN101521561AInactive Publication Date: 2009-09-02TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2009-09-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a high-speed RS485 energy / data transmission terminal which belongs to the field of data transmission technology in an industrial site bus. The transmission terminal comprises an FPGA device, a RS 485 interface unit, a network transformer unit, a terminal impedance matching unit and a DC energy unit, wherein the network transformer unit is respectively connected with the DC energy unit and the terminal impedance matching unit and is also connected with the FPGA device by the RS 485 interface unit. The method comprises the following steps: the terminal reads data, codes the data, carries out parallel / series conversion of the data and then overlays the data with DC energy signals to carry out long-line transmission; after the signals are received by the next level terminal, the serial data is separated from the DC energy signals to extract DC energy signals and detect the DC energy signals, and the original transmission data signals are extracted from the DC energy signals which is carried out parallel / series conversion and decoding. The invention has simplified peripheral hardware design, can increase data transmission rate, extend a transmission distance, has a simple hardware circuit, can be flexibly controlled and is convenient to expand the number of RS 485 transmission nodes.
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Description

technical field

[0001] The invention belongs to the technical field of data transmission of industrial field bus, and in particular relates to a high-speed data transmission terminal based on RS485 bus, which is used for high-speed and long-distance data transmission of monitoring parameters along the RS485 bus in the industrial field. Background technique

[0002] The RS485 bus system has the advantages of simple hardware design, convenient control, low cost, and long transmission distance. It is widely used in industrial control, community monitoring, water regime monitoring, seismic exploration and other fields, among which RS (Recommended Standard) represents the recommended standard. At present, at home and abroad, the existing general-purpose RS485 bus is mainly used for the design of the data transmission part in the measurement and control system or the conversion between different interface standards (for example, the data conversion between RS485 and RS232, or betwe...

Claims

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