Communication organization method and repeater thereof based on massive node cluster

A large-scale, repeater technology, applied in the direction of data exchange through path configuration, electrical components, transmission systems, etc., can solve problems such as inability to support cluster control and management, global addresses increase the burden of node identification, and inability to support clusters, etc. , to achieve the effect of error management and correct transmission of information, improvement of reliability, and stable transmission of information

Active Publication Date: 2015-04-29
BINHAI IND RES INST OF TIANJIN UNIV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these expansion methods simply increase the length of the total address, not only cannot support the cluster of tens of thousands of embedded nodes, but also cannot support the control and management of the cluster, and the redundant global address also increases the burden of node identification

Method used

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  • Communication organization method and repeater thereof based on massive node cluster
  • Communication organization method and repeater thereof based on massive node cluster
  • Communication organization method and repeater thereof based on massive node cluster

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Experimental program
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Embodiment 1

[0042] Aiming at the above purpose and target, the method proposed by the present invention is roughly divided into five parts: node group architecture, address mapping, frame structure extension, relay protocol extension and repeater hardware design. Firstly, complete the node group architecture part, and find the network topology that satisfies the constraints on the number of nodes. Then, through address mapping, the mapping relationship between the global address and the local address of the terminal node is found. Afterwards, through frame structure expansion and relay protocol expansion, protocol support for node group management and control is established to realize communication organization based on large-scale node groups. Its main parts are as follows:

[0043] 1. Node group structure;

[0044] The network topology is as figure 1 As shown, the only master controller in the node group is connected to the terminal through the repeater, presenting a tree topology. ...

Embodiment 2

[0063] Repeater hardware design such as Image 6 , Figure 7 , Figure 8 , Figure 9 shown. The hardware circuit control chip uses a relatively cheap 51 dual-port single-chip microcomputer STC12C5A60S2, while the RS485 interface uses an enhanced Max3085. Because the repeater has a lot of store-and-forward work during the repeating process, the internal memory of the 51 single-chip microcomputer is too small to meet the demand, so a 32K WS62256LLP static expansion memory is added externally, and a latch SN74HC573AN is added as a data latch auxiliary . Since RS485 adopts differential transmission, it is difficult to ensure that the ground potentials of different nodes are within the common-mode voltage range under the condition of large clusters. By isolating the power supply and signal of the control chip and the Max3085 interface, and connecting the transceivers in each local area network to the common ground, the impact is minimized. The power isolation adopts the B0505...

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Abstract

The invention discloses a communication organization method and a repeater thereof based on a massive node cluster. The communication organization method comprises the steps that a framework part of the node cluster is established, and a network topology meeting node number constraint conditions is obtained; the mapping relation between global addresses and local addresses of terminal nodes is obtained through address mapping; a frame structure and a relay protocol are expanded, and the communication organization of the massive node cluster is achieved. The repeater comprises a main controller and an RS485 interface, and the communication repeater further comprises a power source isolation circuit, a signal isolation circuit and a bus biasing circuit. The power source isolation circuit and the signal isolation circuit are used for isolating a power source and signals of the main controller and a power source and signals of the RS485 interface respectively. The bus biasing circuit is used for conducting short circuit and bypass protection on the RS485 interface. The communication organization method and the repeater adapt to the change demands of a network, and the reliability of control over cluster network communication is improved; the purposes of cluster communication and management of embedded equipment are achieved.

Description

technical field [0001] The invention relates to the field of embedded industrial control, in particular to a communication organization method based on a large-scale node group and a repeater thereof. Background technique [0002] In power electronic devices, it is often necessary to carry out long-distance communication in a harsh electrical environment, and the use of RS-485 bus is a relatively common practice. [0003] The RS-485 bus interface circuit is widely used in industrial monitoring and monitoring and other fields due to its advantages of simple hardware design, convenient control, low cost, and high communication speed. The RS-485 bus supports half-duplex or full-duplex mode. The network topology generally adopts a terminal-matched bus structure, and does not support ring or star networks. The standard does not specify the number of transceivers allowed on the bus, but specifies a maximum bus load of 32 unit loads. The maximum input current per unit load is 1.0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08H04L12/44
Inventor 车明周海洋
Owner BINHAI IND RES INST OF TIANJIN UNIV CO LTD
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