Fibre optical CAN bus self-healing ring network interface device

A CAN bus, self-healing ring network technology, used in transportation and packaging, electrical components, circuits or fluid pipelines, etc., can solve problems such as network paralysis, simplify circuits, facilitate debugging and replacement, and improve reliability. Effect

Inactive Publication Date: 2004-12-29
WUHAN UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

In the fiber optic CAN single-ring network, the failure of nodes or links may cause the network to be paralyzed

Method used

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  • Fibre optical CAN bus self-healing ring network interface device
  • Fibre optical CAN bus self-healing ring network interface device
  • Fibre optical CAN bus self-healing ring network interface device

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the following embodiments should not be construed as limiting the present invention.

[0014] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: realize the above-mentioned functional control ring network self-healing interface circuit and select the U.S. Altera company CPLD device EPM7128SLC84-15, design with MAX+plusII development software. CPLD self-healing control interface unit consists of four parts: frequency divider, central state machine, send data selector, receive data selector. The CPLD is used to connect to the RX and TX of the node CAN controller, and the CPLD is connected to the optical fiber loop through PIN and LED at the same time. The clock of the entire self-healing control interface device is provided by an active quartz crystal oscillator PXO-660, and its oscillation freque...

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Abstract

The present invention relates to one kind of ring fiber CAN bus self-cure network interface device, which includes one CPLD device EPM7128S, two light transmitters LEDR and LEDL, two light receivers PINR and PINL, one active quartz crystal ocillator PXO-660, network state LEDs D-sr and D-solution, and receiving state LED D-rx. The CPLD is connected to the CAN controller, and fiber loop via photoelectronic converter module PIN and LED. By means of the present invention and relevant fiber CAN network technology, ring fiber CAN bus self-cure network may be constituted. The present invention can raise the viability of ring fiber CAN bus network obviously, and has the features of simple structure, high reliability and convenient altering and maintenance.

Description

technical field [0001] The invention belongs to an interface device of an optical fiber CAN bus, in particular to an interface device of an optical fiber CAN bus ring network, in particular to an interface device of an optical fiber CAN bus self-healing ring network. Background technique [0002] CAN (Controller Area Network) bus is a serial data communication protocol developed by Bosch Company in Germany in the early 1980s to solve numerous data exchanges in automobiles. Due to its excellent characteristics, CAN bus has become one of the most promising field buses currently recognized. The transmission medium of CAN bus can be twisted pair, optical fiber and coaxial cable. When the working environment is particularly complicated, in order to improve the anti-interference ability and performance of the CAN network, the optical fiber is used as the transmission medium. As a kind of industrial low-level control local area network, the optical fiber CAN...

Claims

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Application Information

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IPC IPC(8): B60R16/02H03M7/00
Inventor 吴友宇程昌银杨菊芳李斌秦神祖
Owner WUHAN UNIV OF TECH
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