Optimization scheduling method based on RS485 bus system

A RS485, optimized scheduling technology, applied in transmission systems, digital transmission systems, electrical components, etc., to solve problems such as insufficient consideration of emergency information

Active Publication Date: 2017-12-29
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent "A polling communication method based on RS485" (application number: CN201510302444.5) communicates through the query method, these methods have insufficient consideration of emergency information, and priority should be given to transmission of data that needs urgent processing

Method used

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  • Optimization scheduling method based on RS485 bus system
  • Optimization scheduling method based on RS485 bus system
  • Optimization scheduling method based on RS485 bus system

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Embodiment Construction

[0023] The implementation manners of the present invention are described below through specific examples, and those skilled in the art can easily implement the content disclosed in this specification.

[0024] Such as figure 1 As shown, the present invention is based on the RS485 bus system, which includes: a host computer 1 and several node units 2, the node units 2 are connected with the host computer through the RS485 bus and control signal lines, and the control signal lines include request sending signals and priority signals And the chip select signal connection. Each node unit requests to send a signal to connect with the host computer through a port, and the low level is effective. The priority of each node unit is connected to the host computer through a port. A low level indicates that the data transmission is urgent, and a high level indicates that the data transmission is not urgent, and whether the data is urgent or not is determined according to the data transmi...

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Abstract

The invention provides an optimization scheduling method based on an RS485 bus system. A detection system is connected with an upper computer and a plurality of node units through an RS485 bus and a control signal line; the upper computer is a DSP; the node units are PLCs; and according to the system, distributed control can be realized. According to the system, for different node communication emergency degree, the scheduling method for updating node unit priorities according to a dynamic competition strategy is provided; the priorities of occupying the bus are automatically adjusted; and the time of occupying the bus is allocated reasonably. According to the system, the advantages that a great deal of data is processed by the upper computer rapidly and the node units are high in reliability are exerted, and the system is characterized by simple debugging.

Description

technical field [0001] The invention relates to an optimal scheduling method based on the RS485 bus system. Background technique [0002] As a serial communication standard, RS485 uses balanced drive and differential reception to drive the bus, which has the advantages of long communication distance, fast transmission speed, and good anti-noise interference. Since RS485 can be applied to multi-station interconnection, one transmitter can connect multiple load devices, and has been widely used in various fields. There are two types of communication in RS485 network: master-slave and bus. In the bus communication protocol, the slave RS485 communication network is easy to build, has good scalability and versatility, and generally adopts the master-slave communication mode in industrial control. However, in multi-station connection, the problem of node communication congestion often occurs. Therefore, it is necessary to design an efficient and stable optimal scheduling metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/911H04L12/927H04L47/80
CPCH04L47/70H04L47/805H04L47/821
Inventor 何金保骆再飞张鹏廖云峰张凡波
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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