RS485 bus communication method based on Modbus protocol and power electronic system based on communication method

A RS485, bus communication technology, applied in the direction of bus network, data exchange through path configuration, etc., can solve the high real-time requirements of data transmission, the communication protocol affects the utilization rate and transmission delay of RS485 bus communication, and the application of RS485 bus communication. Limits and other issues, to achieve the effect of low cost, strong communication reliability, and improved utilization

Active Publication Date: 2014-09-24
安徽海普克电气有限公司
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Problems solved by technology

However, since the application layer corresponding to the RS485 bus has no standard protocol, the construction of the communication protocol and the efficiency of logic processing will largely affect the utilization rate and transmission delay of the RS485 bus communication
However, a

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  • RS485 bus communication method based on Modbus protocol and power electronic system based on communication method
  • RS485 bus communication method based on Modbus protocol and power electronic system based on communication method
  • RS485 bus communication method based on Modbus protocol and power electronic system based on communication method

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Embodiment Construction

[0076] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0077] A kind of RS485 bus communication method based on Modbus protocol is implemented in the RS485 bus multi-machine communication system including a master controller and several slave controllers. The RS485 bus communication method is as follows: figure 1 shown, including:

[0078] (1) The main controller generates corresponding control commands according to the read and write commands or status query commands input by the user, and encapsulates the control commands into control frames, and then sends the encapsulated control frames to the RS485 bus through SCI communication interruption;

[0079] (2) Monitor the RS485 bus from the controller, and start receiving and processing the detected control frame to form a corresponding response frame when the control frame arrives, and send the formed response frame to the RS485 bus;

[0080] (3) Th...

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Abstract

The invention discloses an RS485 bus communication method based on a Modbus protocol and a power electronic system based on the communication method. A master controller and slave controllers of the power electronic system communicate through the RS485 bus communication method based on the Modbus protocol. According to the RS485 bus communication method, the structures of communication frames generated by the controllers are defined, and reasonable communication frames and processing logic are defined through structural design of a communication program, which improves the communication efficiency and the utilization rate of an RS485 bus communication system, accelerates the speed of data response, and greatly reduces the transmission delay. The adopted RS485 bus communication system is high in communication reliability, low in cost and easy to implement, and is suitable for application in large-scale power electronic systems.

Description

technical field [0001] The invention belongs to the technical field of power electronics application, and in particular relates to a Modbus protocol-based RS485 bus communication method and a power electronic system based on the communication method. Background technique [0002] The increasing maturity of power electronic technology and the wide application of power automation equipment have effectively promoted the development of industrial productivity and the improvement of the level of electrical automation. However, due to the capacity limitation of a single power electronic device, it is restricted in the field of high-power applications. [0003] Utilizing the existing mature technology of small-capacity power electronic devices, it has become a research hotspot to realize the application of large-capacity occasions through modular parallel combination. At the same time, in some cases, it is necessary to combine different types of power electronic devices (power elec...

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Application Information

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IPC IPC(8): H04L12/40
Inventor 陈国柱徐群伟王异凡
Owner 安徽海普克电气有限公司
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