A topology learning method, device and system for a unidirectional serial bus network

Abstract

The present invention provides a topology learning method, device and system for a unidirectional serial bus network. A master node device sends a topology learning command message to instruct the slave node device to read the information of the slave node device in the topology learning command message. Node number, update the node number after adding 1 to the node number, add the updated node number, its own address or its own device ID to the topology learning instruction message, and when it is an intermediate slave node device, add The completed topology learning instruction message is forwarded to its own next-hop slave node device; when it is the last hop slave node device, it returns the added topology learning instruction message to the master node device; the master node device receives In the returned topology learning instruction message, the topology structure of the unidirectional ring network is determined according to the number of nodes, slave node device addresses or IDs in the returned topology learning instruction message. The embodiment of the present invention can automatically learn the network topology, so as to sense the change of the network topology.

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...

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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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