Topology learning method, device and system of one-way serial bus network

Abstract

The invention provides a topology learning method, device and system of a one-way serial bus network. The topology learning method of the one-way serial bus network comprises the steps that a master node device sends a topology learning instruction message, wherein the topology learning instruction message is used for instructing a slave node device to read a node number of the slave node device in the topology learning instruction message, update the node number after one node is added, add the updated node number, the address thereof or the ID thereof to the topology learning instruction message, forward the topology learning instruction message after finishing the addition to a next-hop slave node device of the slave node device when the slave node device serves as an intermediate slave node device, and return the topology learning instruction message after finishing the addition to the master node device when the slave node device is the last-hop slave node device; and the master node device receives the returned topology learning instruction message and determines a topology structure of a one-way ring network based on the node number, the slave node device address or ID in the returned topology learning instruction message. According to the embodiment, the network topology structure can be learnt automatically, and the change of the network topology structure can be accordingly perceived.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a topology learning method, device and system for a unidirectional serial bus network. Background technique [0002] At present, unidirectional serial buses such as RS485 are used in networks such as remote industrial control and remote intelligent meter reading; the above-mentioned networks are usually constructed with a unidirectional ring network or a unidirectional ring network connected to a unidirectional ring network. , specifically including the following two networking methods: method 1, the concentrator forms a unidirectional ring network directly through a unidirectional serial bus and several smart instruments; method 2, the concentrator and the collector form a backbone network through a unidirectional ring network, Each collector then forms a one-way ring subnet with a number of smart instruments through a one-way serial bus. In the one-way serial bus networ...

AI Technical Summary

Problems solved by technology

In the one-way serial bus network constructed in the above-mentioned method one, the concentrator acts as the master node device of the one-way ring network, and the smart instrument acts as the slave node device of the one-way ring network; the one-way serial bus network constructed in the above-mentioned method two In the bus network, the concentrator is the master node device of the unidirectional ring network, the collector is the slave node device of the unidirectional ring network, and the master node device of the unidirectional ring subnet formed with itself, and the smart instrument is the master node device of the unidirectional ring network. The slave node device of the unidirectional ring subnet; in the above-mentioned networking mode, a large amount of basic configuration and maintenance need to be manually performed to determine the topology of the unidirectional serial bus network. Therefore, the unidirectional serial bus network The degree of automation is low, and it is difficult to perceive changes in the network topology

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