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Method for setting up, detecting and displaying interval time of characters inside Modbus RTU frame and between frames

A character interval and time interval technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problems that ModbusRTU frame setting and detection display cannot be realized, and achieve the effect of simple structure and intuitive results

Inactive Publication Date: 2009-06-24
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention is in order to overcome the technical problem that the prior art cannot realize the setting and detection and display of the character interval time between the Modbus RTU frame and the frame, and then provides a Modbus RTU frame and the inter-frame character interval time setting and detection display system and method

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  • Method for setting up, detecting and displaying interval time of characters inside Modbus RTU frame and between frames

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specific Embodiment approach 1

[0031] Specific implementation mode one: combine figure 1Describe this embodiment, the system of this embodiment is made up of master node 1, slave node 2, Modbus bus 3;

[0032] The master node 1 is made up of a first keyboard 1-1, a first microprocessor unit 1-2, a first display unit 1-3, a first communication unit 1-4, and a start sending button 1-5; the first keyboard The control data output bus end of 1-1, the control data output bus end of start sending button 1-5 are respectively connected with a control data input bus end of the first microprocessor unit 1-2, the communication of the first communication unit 1-4 The data output and input bus end is connected to the communication data output and input bus end of the first microprocessor unit 1-2, and the display data output bus end of the first microprocessor unit 1-2 is connected to the data input bus of the first display unit 1-3 end;

[0033] Slave node 2 is made up of the second keyboard 2-1, the second microproce...

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Abstract

The invention relates to a method for setting and detecting and displaying the character interval time within a Modbus RTU frame and between frames, which relates to the technical field of the method for setting and detecting and displaying the character interval time within a Modbus RTU frame and between frames. It is to solve the technical problem that the existing technology cannot realize the setting and detection display of the character interval time within and between frames of Modbus RTU. Its method steps are: setting 3-character interval time in the master node (1) and inputting a transmission message of two frames; setting the transmission message type of the master node (1) as correct, error type 1, error type 2 or Error type 3 and send; slave node (2) divides the received message according to the detected interval and displays the received message. The invention can set the character interval time of the RTU message, detect and display it, and the obtained result is intuitive.

Description

technical field [0001] The invention relates to the technical field of a Modbus RTU intra-frame and inter-frame character interval time setting, detection and display method. Background technique [0002] Fieldbus technology has been increasingly used in industrial sites. The Modbus bus is more and more widely used because of its advantages such as simple protocol, easy implementation, high cost performance and high reliability. The setting of the character interval time between frames and between frames is one of the key technologies of the Modbus RTU protocol. The Modbus RTU protocol distinguishes the beginning and end of a frame message through the detection of the character interval time between the message frame and the frame. Incorrect handling of interval times will result in incompatibility between different Modbus products. The setting and detection of character interval time between Modbus RTU frames and inter-frames is very meaningful for understanding Modbus ke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/26H04L12/24
Inventor 佟为明赵志衡陈培友刘勇潘悦李中伟
Owner HARBIN INST OF TECH
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