A real-time communication method based on rs485 network
A RS485, real-time communication technology, applied in the direction of data exchange network, digital transmission system, electrical components, etc., to achieve the effect of improving real-time performance, improving network operation efficiency, and preventing data collision
Active Publication Date: 2020-08-07
HUIZHOU TECHZEN IOT SCI & TECH CO LTD
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[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and provide a real-time communication method based on the RS485 network, which is used to solve the problem of multi-point concurrent real-time communication in the RS485 network
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[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0024] refer to Figure 1-4 Shown, a kind of real-time communication method based on RS485 network comprises a RS485 bus detection circuit and RS485 bus competition method; Described RS485 bus detection circuit is a closed-loop adjustment circuit, and described RS485 bus detection circuit includes a sending detection pin and a receiving detection pin; the RS485 bus detection circuit is used to monitor the RS485 bus state; the RS485 bus competition method is used to compete for the control of the RS485 bus with some terminals connected to the background, and the described bus competition method is The bus contention time of the terminal is calculated by using a random discrete mathematical model combined with the timer and the terminal machine number, and the terminal with the shortest bus contention time obtains the control right of ...
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The invention provides a real-time communication method based on an RS485 network. The method comprises a RS485 bus detection circuit implementing the method and a RS485 bus competition method. The RS485 bus detection circuit is a closed-loop adjustment circuit, the RS485 bus detection circuit comprises a sending detection pin and a receiving detection pin, and the RS5485 bus detection circuit is used for monitoring the state of the RS485 bus. The RS485 bus competition method is used for competing for a control right of the RS485 bus with a plurality of terminals connected with a background, the bus competition method is to compute bus competition time of the terminal by using a random discrete mathematical model in combination with a timer and a terminal machine number, and the terminal with the shortest bus competition time acquires the control right of the RS485 bus. According to the method provided by the invention, the mode of traditional RS485 bus roll-call polling is broken, and the control right of the bus is acquired by using a novel bus computation mode, so that instantaneity of the network system is improved, data collision is effectively prevented, and thus network operation efficiency is improved.
Description
technical field [0001] The invention relates to the application of the Internet of Things system, in particular to a real-time communication method based on the RS485 network. Background technique [0002] The existing RS485 network system generally adopts the polling mode in applications where real-time requirements are not high. With the increase of network nodes, this mode causes the delay of each node to become longer and the real-time performance to decrease. Therefore, it is only suitable for Small networks with low real-time requirements cannot meet the requirements at all in large and medium-sized network applications with high real-time requirements. Contents of the invention [0003] The purpose of the present invention is to overcome the above problems in the prior art, and provide a real-time communication method based on the RS485 network, which is used to solve the problem of multi-point concurrent real-time communication in the RS485 network. [0004] In or...
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IPC IPC(8): H04L12/413
CPCH04L12/413
Inventor 苏洪强石教辉黄俊祥
Owner HUIZHOU TECHZEN IOT SCI & TECH CO LTD