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Ring type optical fiber CAN bus network

A technology of CAN bus and ring optical fiber, which is applied in the field of ring CAN bus network, can solve the problems of poor network performance and large network delay, and achieve reduced bus transmission delay, improved anti-interference ability, communication reliability and real-time sex enhancing effect

Inactive Publication Date: 2004-10-27
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, if the CAN transceiver is used in the optical fiber CAN network, it will bring a large delay to the network and make the performance of the network worse.

Method used

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  • Ring type optical fiber CAN bus network
  • Ring type optical fiber CAN bus network
  • Ring type optical fiber CAN bus network

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and examples, but these examples should not be construed as limiting the present invention.

[0022] like figure 1 As shown, the TX and RX levels of the CAN controller are TTL levels, so there is no need for level conversion in the ring CAN bus network, and the electro-optical conversion module LED and the photoelectric conversion module PIN are directly used for message transmission in the optical fiber ring network . In this way, there is no need to use a CAN transceiver, which reduces the transmission delay on the bus and simplifies the ring network interface circuit at the same time. The use of optical fiber as the transmission medium makes the anti-interference performance of the whole system better, and the stability of the whole system is improved.

[0023] like figure 2 As shown, it is assumed that in the CAN bus network, node 1 becomes the master node of the ...

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Abstract

Optical fiber as transmission media is adopted in the annular CAN bus network including each CAN node, module of photovoltaic conversion and deducted network interface. The invented CAN bus network does not use CAN transceiver. Advantages of the ring type optical fiber CAN bus network are: eliminating network blocking, reliable communication, simple circuit and high interference immunity. Interference killing feature of optical fiber CAN network being better than twisted-pair CAN network meets requirements on site of inclement industries.

Description

technical field [0001] The invention belongs to CAN bus network, in particular to a circular CAN bus network whose transmission medium is based on optical fiber. Background technique [0002] CAN (Control Area Network) bus is a serial multi-master controller local bus, which has good network security, communication reliability and real-time performance, and low network cost. Especially suitable for automotive and various industrial control fields. The network can work in the industrial environment with harsh environment, strong electromagnetic radiation and large vibration. The transmission medium can be twisted pair, coaxial cable or optical fiber, and the data transmission rate can reach 1Mbits / s. At present, the twisted-pair CAN bus has been widely used, and the technologies of the twisted-pair CAN bus have been very mature. The twisted-pair CAN bus often uses CAN transceivers such as 82C250 to complete level conversion, and convert the logic lev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/25H04B10/275H04Q3/52
Inventor 吴友宁李波秦神祖梁红杨菊芳
Owner WUHAN UNIV OF TECH
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