System and method for confirming CAN node message transmission waiting condition and waiting time

A technology of waiting time and message sending, applied in transmission systems, digital transmission systems, electrical components, etc., to achieve accurate results

Inactive Publication Date: 2007-02-07
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention aims to overcome the problem that the prior art cannot effectively determine the MAC mechanism of the CAN bus and the composition time / delay of message transmission, and then provides a method for determining the waiting conditions and waiting time for CAN node message sending System and method

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  • System and method for confirming CAN node message transmission waiting condition and waiting time
  • System and method for confirming CAN node message transmission waiting condition and waiting time

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specific Embodiment approach 1

[0022] Specific implementation mode one: combine figure 1 , figure 2 Describe this embodiment, the system of this embodiment is composed of a first node 1, a second node 2, and a third node 3;

[0023] The first node 1 is composed of a first keyboard 1-1, a first processor 1-2, a first display unit 1-3, a first communication unit 1-4, and a first start sending button 1-5; the first The control data output bus end of the keyboard 1-1 and the control data output bus end of the first start sending button 1-5 are respectively connected to two control data input bus ends of the first processor 1-2, and the first communication unit 1-4 The communication data output input bus end of the first processor 1-2 is connected to the communication data output input bus end of the first processor 1-2, and the display data output bus end of the first processor 1-2 is connected to the data input bus end of the first display unit 1-3;

[0024] The second node 2 is made up of a second keyboard...

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Abstract

The invention relates to a system for fixing the sending waiting condition and waiting time of CAN node report, and a relative method, wherein present technique can not effectively fix the forming time/delay of MAC mechanism and report sending; the CAN interfaces of the first communication unit (1-4), the second communication unit (2-4), and the third communication unit (3-4) are connected to the CAN bus; it comprises: (1) starting system; 92), initializing the first node (1); (3) setting the mark field, control field, and data field of first node (1); (4) pressing the first start sending button (1-5); (5) initializing the second node (2); (6) pressing the second start sending button (2-5); (7) pressing the first start sending button (1-5); (8) initializing the third node (3); (9), initializing the first node (1); (10) pressing the second start sending button (2-5). The invention can fix the forming time/delay of MAC mechanism and report sending real-time.

Description

technical field [0001] The invention relates to the technical field of generation of waiting conditions for sending CAN node messages and determination of waiting time. Background technique [0002] Fieldbus technology has been increasingly used in industrial sites. CAN bus has been more and more widely used because of its unique advantages such as high efficiency, low price and high reliability. In the research and application of CAN bus, the time characteristics related to message transmission is a problem that people care about. For most fieldbuses, the total delay of message sending includes waiting time and sending net delay. The sending net delay is a relatively easy time to determine, it depends on the number of messages and baud rate, and the waiting time It mainly depends on the MAC (Media Access Control) mechanism of the network, and it is often complicated and difficult to analyze and determine. At present, the theoretical analysis of the MAC mechanism of the C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/28H04L12/56H04L12/26
Inventor 佟为明刘勇林景波李凤阁李中伟金显吉高洪伟
Owner HARBIN INST OF TECH
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