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Communication system and communication method based on rs485 bus

A RS485 and communication system technology, applied in the field bus field, can solve the problems of low communication efficiency, inconvenient operation, fast, and unguaranteed real-time response, etc., and achieve the effect of improving communication efficiency

Active Publication Date: 2021-11-23
SHANGHAI STEP ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional RS485 communication mechanism needs to manually set the station number of each slave station, and then the master station polls each slave station in turn, which is inconvenient to operate, the communication efficiency is not high, and the fast and real-time response cannot be guaranteed

Method used

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  • Communication system and communication method based on rs485 bus
  • Communication system and communication method based on rs485 bus
  • Communication system and communication method based on rs485 bus

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Experimental program
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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] figure 1 A schematic diagram of a communication system based on the R485 bus according to an embodiment of the present invention is shown. see figure 1 . The communication system based on the R485 bus according to an embodiment of the present invention includes a master station 1 and a plurality of slave stations 2 , and the master station 1 and the plurality of slave stations 2 are all connected to the RS485 bus 3 . Among them, the master station 1 and the first-level slave station ( figure 1 The slave stations 1) and the slave stations 2 mentioned above are also serially connected in series through the control line 4.

[0016] In this embodiment, the master station 1 includes a PLC controller and an FPGA, and the PLC controller is electrically connected to the FPGA; each slave station 2 is an MCU. The slave station 2 is connected to the RS485 bus 3 throug...

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PUM

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Abstract

The invention discloses a communication system based on the R485 bus, which includes a master station and a plurality of slave stations, and the master station and the plurality of slave stations are connected to the RS485 bus, wherein, between the master station and the first-level slave stations and each The slave stations are also connected in series through the control lines. The control lines between the master station and the first-level slave stations are used for the master station to send enable signals to the first-level slave stations, and the control lines between the slave stations are used for the upper The first-level master station sends an enable signal to the next-level slave station. The invention also discloses a communication method of the communication system based on the R485 bus. The invention can realize automatic configuration of slave station nodes, has good real-time performance and high communication efficiency.

Description

technical field [0001] The present invention relates to field bus technology. Background technique [0002] In recent years, with the development of automated production lines, intelligent manufacturing, digital factories, etc., universal controllers have been more and more widely used, and more and more modules for sampling and controlling signals need to be connected to the controller. Scalability and communication speed put forward high requirements. [0003] As a two-wire differential bus, RS-485 has the characteristics of supporting multiple nodes, long communication distance, and strong anti-interference. The bus network topology generally adopts a terminal-matched bus structure. The traditional RS485 communication mechanism needs to manually set the station number of each slave station, and then the master station polls each slave station in turn. The operation is inconvenient, the communication efficiency is not high, and the fast and real-time response cannot be gu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/40H04L12/403H04L12/24G06F13/42
CPCG06F13/4286H04L12/40006H04L12/403H04L41/0803H04L41/0886
Inventor 郝佳佳王科李延法钟前进
Owner SHANGHAI STEP ELECTRIC