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A Communication Organization Method Based on Large-Scale Node Group and Its Repeater

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, inability to support clusters, and global addresses to increase the burden of node identification. , to achieve the effect of error management and correct transmission of information, improvement of reliability, and stable transmission of information

Active Publication Date: 2017-11-28
BINHAI IND RES INST OF TIANJIN UNIV CO LTD
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  • Description
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  • Application Information

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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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  • A Communication Organization Method Based on Large-Scale Node Group and Its Repeater
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  • A Communication Organization Method Based on Large-Scale Node Group and Its Repeater

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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 large-scale node group-based communication organization method and its repeater. The communication organization method includes: constructing a node group architecture part, obtaining a network topology structure satisfying node number constraints; and obtaining a terminal through address mapping. The mapping relationship between the global address of the node and the local address; expand the frame structure and relay protocol to realize the communication organization of large-scale node groups. The repeater includes: a main controller, an RS485 interface, and the communication repeater also includes: a power isolation circuit, a signal isolation circuit, and a bus bias circuit; the power isolation circuit and the signal isolation circuit are used to respectively The main controller and the power and signal of the RS485 interface are isolated; the bus bias circuit is used for short-circuit and bypass protection of the RS485 interface. The invention adapts to the changing requirements of the network, improves the reliability of the communication control of the cluster network, and solves the problems of cluster communication and management of embedded devices.

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 Patents(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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