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

A technology of character interval and time, applied in the direction of digital transmission system, transmission system, electrical components, 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: 2007-12-26
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

Method used

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  • System and 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 embodiment one: illustrate this embodiment in conjunction with Fig. 1, 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 micropro...

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Abstract

The invention is used for solving the issue that is the currently-used technology can't set, detect and display the intra-frame and inter-frame character interval time of Modbus RTU. The Modbus bus interface of first communication unit on master node and the Modbus of second communication unit on slave node are respectively connected on Modbus bus; setting up 3 character interval times in the master node and inputs two frames of transmission message; dividing the types of transmission messages into two types, namely error type 1 and error type 2, and transmitting them; according to the detected time interval, the slave node divides and displays the received messages.

Description

technical field [0001] The invention relates to the technical field of setting, detecting and displaying the time interval between characters in a Modbus RTU frame and between frames. 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 ...

Claims

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Application Information

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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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