System and its method capable of producing Modbus CRC error and comparing and displaying error

An error and display unit technology, applied in the transmission system, digital transmission system, data exchange through path configuration, etc., can solve the problems such as the generation, comparison and display of ModbusCRC errors that cannot be realized, and achieve the effect of simple structure and intuitive results.

Inactive Publication Date: 2007-10-10
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

[0003] The present invention aims to overcome the problem that the prior art cannot realize the generation, comparison and display of Modbus CRC errors, and further provide a system and method capable of generating Modbus CRC errors and comparing and displaying the errors

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  • System and its method capable of producing Modbus CRC error and comparing and displaying error

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specific Embodiment approach 1

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT: The present embodiment will be described in connection with FIG.

[0021] The main node 1 consists of a first keyboard 1-1, a first processor 1-2, a first display unit 1-3, a first communication unit 1-4, a start button 1-5; a first keyboard 1-1 The control data output bus terminal, the control data output bus end of the start button 1-5 is connected to a control data input bus end of the first processor 1-2, and the communication data output input bus terminal of the first communication unit 1-4, respectively. The communication data output of the first processor 1-2 inputs the bus terminal, and the display data output bus end of the first processor 1-2 connects the data input bus terminal of the first display unit 1-3;

[0022] From the node 2, the second keyboard 2-1, the second processor 2-2, the second display unit 2-3, and the second communication unit 2-4; the control data output bus end connection of the second keyboa...

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Abstract

The invention is in use for solving issues that current technique cannot generate, compare, and display error of Modbus CRC. In the invention, bus interface (BI) of Modbus of first communication unit (CU) in main node, BI of Modbus of second CU in slave node, and BI of Modbus of third CU in interference node are connected to bus of Modbus in sequence. The method includes steps: inputting request with 8 bytes to main node; depressing start button; operation for receiving synchronous messages from slave node and interference node is ended, and response message, and interference message are sent out; according to Modbus protocol, interference message calculates CRC1 of CRC value, and CRC1 is compared with CRC of received CRC value; obtaining result of CRC error. The invention can generate, compare, and display error of Modbus CRC, and get out intuitive result.

Description

Technical field [0001] The present invention relates to the production, comparison and display of Modbus CRC errors. Background technique [0002] Fieldbus technology has been more and more applied to the industry site. The Modbus bus has achieved increasing extensive applications with simple agreements, easy implementation, high cost performance, and high reliability. The Modbus protocol uses a 16-bit CRC check to provide a high communication reliability guarantee. The CRC check is widely used in the communication system. CRC errors generation and inspection, which is meaningful for understanding the key technologies of Modbus. However, the technical research and analysis of the production and inspection of CRC errors at home and abroad is relatively small. This hinders the development of MODBUS bus teaching experiments and training. Inventive content [0003] The present invention is to overcome the existing techniques that cannot achieve the generation, comparison and display...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L12/40H04L29/06H04L12/56H03M13/00
Inventor 佟为明赵志衡刘勇李凤阁潘悦金显吉
Owner HARBIN INST OF TECH
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