A network communication method for distributed measurement equipment with star expansion

Abstract

The invention discloses a network communication method for distributed measuring equipment with star expansion, which includes the following steps: A1: After the system is powered on, master nodes at all levels are responsible for enumerating and identifying sub-nodes connected to the master node; when other After the child node is connected to any interface, after the enumeration identification process, it reports its address and routing information to the master node through the protocol, automatically creates a new routing table, and completes the routing table reconstruction process; A2: Query whether there is data in the data buffer layer , if there is, judge whether it is a local data packet according to the data packet information; if it is a local data packet, analyze and execute it, if not, forward it to the corresponding interface according to the address information of the data packet. The network protocol is based on the standard communication packet structure, and quickly completes the enumeration of devices and the establishment of routing tables through simple communication between devices in the network, and realizes the addressing, data transmission management and reliability guarantee between devices in the network communication protocol.

Description

technical field [0001] The invention relates to the field of interconnected networking of wired measuring equipment, in particular to a star-shaped expansion distributed measuring equipment network communication method. Background technique [0002] In the field of measurement, a large amount of data needs to be transmitted between systems and system modules. At present, most of the industrial field buses used in large quantities are bus-type. When the measurement system performs data transmission with multiple measurement devices, the load of the measurement system will be greatly increased, which seriously affects the communication efficiency between the systems. The current fieldbus has the following problems: [0003] 1) There are many types, and there are too many factors to consider when choosing. In general, most buses are point-to-point, and only a limited number are networkable. Most of the current popular network buses are bus-type, which is characterized by low...

AI Technical Summary

Problems solved by technology

Most of the current popular network buses are bus-type, which is characterized by low speed, real-time performance and high reliability.

In today's stage of vigorous development of the Internet of Things and big data, low-speed buses are bound to be eliminated, and they are far from meeting the needs of social development.

[0004] 2) Complicated to use

[0005] 3) Real-time problems

However, the current star network does not limit the number of layers from the protocol itself, and the design of the data packet structure is more to ensure the rate of data transmission, but it cannot well control the data transmission delay between any number of points.

This sometimes seriously affects the collaborative work efficiency of the entire system in the field of industrial fieldbus

[0006] 4) Flow balance problem

The data transmission between all nodes of the bus network must be completed through a single bus, and its low transmission efficiency has become an important factor affecting the existence of this network

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