Fire alarm applicaton layer data transmission method based on CAN2.0B

A data transmission method and fire alarm technology, which is applied in the field of CAN2.0B-based fire alarm application layer data transmission, can solve the problems of not being able to meet the needs of fire alarm systems

Active Publication Date: 2007-08-22
深圳市高新投三江电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the CAN2.0B standard alone cannot meet the needs of the current fire alarm system, which requires an application layer protocol to ensure the fast and reliable transmission of these data information

Method used

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  • Fire alarm applicaton layer data transmission method based on CAN2.0B
  • Fire alarm applicaton layer data transmission method based on CAN2.0B
  • Fire alarm applicaton layer data transmission method based on CAN2.0B

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Embodiment Construction

[0023] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0024] 1. Construction of application layer protocol packet format:

[0025] In the CAN2.0 technical specification, the data frame ID is divided into standard (A) and extended (B) two ways. The standard mode includes 11Bit, and the extended mode includes 29Bit. The bus transmission arbitration is related to the composition of the ID identifier. The smaller the value of the ID, the higher the priority of the data frame, the easier it is for the sending node to seize the bus in the bus arbitration, and the shorter the delay for the completion of data frame transmission. The fire alarm application layer protocol adopts the CAN2.0B standard. The ID29bit of the data frame is divided into 4 areas, the information packet type field, the sending source address field, the receiving destination address field, and the packet number fie...

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PUM

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Abstract

The invention discloses a fire alarming application layer data transmitting method based on CAN2.0B, it constructs the information pack according to the length of the transmission information, at the same time, constructed data frame labels include information pack field, transmitting source field, receiving target address field, and information pack data frame number field, the priority of the transmitting information can be defines easily, overcomes the deficiencies that there has no transmitting source address and target address field in the CAN protocol, it can be applied to fire alarming control system; the replay mechanism of the receiving joint guarantees the reliability of the data transmission; it uses multi-frame transmission, or multi-pack, multi-frame transmission, accords the transmission of pack whose length more than single information layer, and of the file whose length more than the maximal permissible length of the single information layer pack; it uses time-out repeating mechanism, joint failure detecting mechanism, buffer area repeating mechanism in the data transmission process, thus it can guarantee the accuracy and effectiveness of data transmission.

Description

【Technical field】: [0001] The invention relates to a data transmission method based on the CAN2.0B field bus application protocol, in particular to an application layer data transmission method applied in the field of fire alarm control. 【Background technique】: [0002] With the emergence of more and more large-scale group buildings, higher and higher requirements are put forward for automatic fire alarm systems in terms of geospatial fire alarm detection and fire equipment linkage control. Large-scale buildings make the geographic description information larger, the fire detection points more, and the equipment linkage control becomes more complicated. At the same time, as the communication distance becomes farther and farther, the delay of communication and the interference of the environment increase, resulting in the reduction of real-time performance, accuracy and reliability of information transmission. All of these require the alarm host to be able to drive and manag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B25/00
Inventor 黄红军
Owner 深圳市高新投三江电子股份有限公司
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