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CAN bridges

A CAN controller and network bridge technology, applied in the field of CAN bridges, can solve problems such as the difficulty of long-distance transmission of CAN bus, and achieve the effects of improving speed and real-time performance, extending transmission distance, and enhancing reliability.

Inactive Publication Date: 2013-10-09
CHENGDU SYNSMART TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems of CAN bus long-distance transmission difficulties in large-scale networks by setting a CAN bridge, and achieves the purpose of efficient and fast data transmission

Method used

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  • CAN bridges

Examples

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Embodiment 1

[0015] Such as figure 1 As shown, this embodiment includes a microcontroller, four CAN controllers and four CAN transceiver modules, the CAN controllers are respectively connected to the microcontroller, and the four CAN transceiver modules are respectively connected to the four CAN controllers. The microcontroller and the CAN controller are integrated, the four CAN controllers work at the same time, and the structure and program of each channel are the same, so the speed and real-time performance of the system can be improved; when the system is powered on, the CAN transceiver module It is connected with the CAN bus through the output and input interface, the data in the CAN bus enters the microcontroller through the CAN controller, and the microcontroller starts to process and forward the information in the network. The four-way CAN bridge has four CAN branches, and each branch can add a new CAN bridge, so a large-scale CAN network can be formed, which can extend the transmi...

Embodiment 2

[0017] Such as figure 1 As shown, this embodiment is based on Embodiment 1, and preferably, the CAN controller is a CAN controller of CAN2.0B standard or ISO1198-1 standard. Comes with a four-way interconnected CAN controller, fully supports CAN2.0B and ISO1198-1 standards, each CAN controller can achieve a rate of 1Mbps, and its global acceptance filter can identify 11-bit and 29-bit Rx of all buses Identifiers have obvious advantages over the SJA1000 CAN controller.

[0018] Preferably, the microcontroller is LPC2194. Because LPC2194 integrates four-way CAN controllers, it can easily realize four-way CAN bus interfaces, which not only reduces the scale of the system, but also improves the stability of the system.

[0019] Preferably, the CAN transceiver module is CTM8251T. CTM8251T is a general-purpose CAN transceiver module with isolation, which integrates all necessary CAN isolation and CAN transceiver devices, and has a 2 500 V isolation function and CAN-bus bus overvo...

Embodiment 3

[0021] Such as figure 1 As shown, in this embodiment, on the basis of Embodiment 1 and Embodiment 2, the microcontroller is also provided with an embedded high-speed Flash memory of 256 KB. The setting of the embedded high-speed memory enables the microcontroller to run at the highest clock frequency with extremely low power consumption and extremely fast processing speed.

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Abstract

The invention discloses CAN bridges which comprise a microcontroller, four CAN controllers and four CAN transceiver modules. The CAN controllers are respectively connected with the microcontroller. The four CAN transceiver modules are respectively connected with the four CAN controllers. The four CAN bridges have four CAN branch lines. Each branch line can be provided with a new CAN bridge, and accordingly a large-scale CAN can be formed, network transmission distance can be prolonged, especially after relaying of several CAN bridges is carried out, transmission distance can be greatly prolonged, and transmission distance can reach several kilometers or even dozens of kilometers. Each CAN branch line can achieve selecting of different routes between different networks, and the reliability of the CAN is improved.

Description

technical field [0001] The invention relates to computer network transmission technology, in particular to a CAN bridge. Background technique [0002] With its unique design, low cost, high reliability, real-time performance and strong anti-interference ability, CAN bus has been widely used in the fields of automobile industry, machinery industry, textile industry, robot, CNC machine tools, medical equipment and so on. CAN bus can be used from high-speed network to low-speed multi-way wiring network, its highest transmission rate can reach 1 Mbps, and the longest transmission distance can reach 10 km (when the transmission rate is below 5 kbps). But when the transmission rate is required to be high and the transmission distance is long, a single bus cannot be completed; and in a large network, the access of multiple buses is often required. Contents of the invention [0003] The invention solves the problems such as the difficulty in long-distance transmission of the ...

Claims

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Application Information

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IPC IPC(8): H04L12/46H04L12/40
Inventor 康清华
Owner CHENGDU SYNSMART TECH DEV
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