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A data transmission terminal, RS485 technology, applied in the direction of digital transmission system, transmission system, electrical components, etc., can solve the problems of signal distortion, intersymbol interference, little research on RS485 high-speed data transmission technology, etc., to achieve simple hardware circuit, control Flexibility and the effect of increasing data transfer rates
Inactive Publication Date: 2011-07-20
TSINGHUA UNIV
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Problems solved by technology
In 2004, Clark K pointed out that the amplitude and frequency of signal attenuation during long-distance transmission are related to the characteristics of the cable, and intersymbol interference will occur during high-speed transmission, resulting in signal distortion
[0005] In recent years, some research institutes in China have also conducted a preliminary analysis of the factors affecting the communication reliability of the RS485 bus network system, and put forward a simple method of communication reliability from the aspects of interface device selection, software design, power supply, shielding and grounding and other aspects of anti-electromagnetic interference. Measures (see: [1] Ling Guoping, Zhou Xinjian. How to improve the reliability of RS485 communication in the measurement and control system. Journal of Instrumentation, 2005, 26 (8): 470-471, 476; [2] Zhang Fange, Heng Junshan, Zhen Changing strength. Research on the reliability of RS485 bus network. Journal of Instrumentation, 2006, 27(6): 2458-2459), but the research in China is mainly to realize the application of RS485 bus under conventional indicators, such as the general data control based on RS485 bus converter, and the conversion between RS485 and RS232 or USB interface, etc., there are few studies on RS485 high-speed data transmission technology
Moreover, the existing RS485 bus system mainly focuses on realizing data communication between different nodes in the distributed monitoring system, and rarely involves superimposed transmission between data and DC energy in the bus
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[0033] The present invention designs and realizes a kind of energy / data transmission terminal of high-speed RS485, and the detailed description in conjunction with each accompanying drawing and embodiment is as follows:
[0034]The transmission terminal of DC energy / data of the high-speed RS485 of the present invention has data sending channel and data receiving channel function, and its composition structure, as figure 1 shown; the transmission terminal includes:
[0035] FPGA (Field-Programmable Gate Array) device 4 is used for data transmission functions such as 8B / 10B encoding, parallel / serial conversion, and clock generation unit, as well as data detection, serial / parallel conversion, 10B / 8B decoding and Data reception such as CRC data verification;
[0036] The RS485 interface unit 3 is used to realize high-speed transmission and reception of serial data under the RS485 bus, and to realize impedance matching between the FPGA device and the RS485 interface device;
[00...
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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 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 comprisesan 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 DCan 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, codesenergy 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, codesthe 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 terthe 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 energminal, 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, hay 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.s a simple hardware circuit, can be flexibly controlled and is convenient to expand the number of RS 485 transmission nodes.
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 or the conversion between different interface standards (such as the data conversion between RS485 and RS232, or between RS485 and USB interface) in the measurem...
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Application Information
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