CN103346946A - CAN bridges - Google Patents
CAN bridges Download PDFInfo
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- CN103346946A CN103346946A CN2013102663813A CN201310266381A CN103346946A CN 103346946 A CN103346946 A CN 103346946A CN 2013102663813 A CN2013102663813 A CN 2013102663813A CN 201310266381 A CN201310266381 A CN 201310266381A CN 103346946 A CN103346946 A CN 103346946A
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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
The present invention relates to the computer network transmission technology, specifically refer to a kind of CAN bridge.
Background technology
Characteristics such as the CAN bus is unique with its design, cost is low, reliability is high, real-time and antijamming capability are strong have obtained using widely in fields such as auto industry, mechanical industry, textile industry, robot, Digit Control Machine Tool, medicine equipments.Multichannel wiring network from the express network to low speed can use the CAN bus, and its maximum transmission rate can reach 1 Mbps, and transmission range can reach 10 km(transmission rates when 5 kbps are following farthest).But when requiring the higher and transmission range of transmission rate far away, single bus just can't be finished; And in large-scale network, often need the access of multiple bus.
Summary of the invention
The present invention solves problem such as the total line length Distance Transmission of CAN difficulty in the catenet by a kind of CAN bridge is set, and reaches the purpose of efficient quick data transfering.
Purpose of the present invention reaches by the following technical programs:
The present invention includes microcontroller, four CAN controllers and four CAN transceiver modules, described CAN controller links to each other with microcontroller respectively, and four CAN transceiver modules link to each other with four CAN controllers respectively.The integrated mode that microcontroller and CAN controller adopt, four CAN controllers are worked simultaneously, and the structure on each road is all identical with program, therefore can improve speed and the real-time of system; After system powered on, the CAN transceiver module linked to each other with the CAN bus by input and output interfaces, and the data in the CAN bus enter into microcontroller by the CAN controller, and microcontroller begins the information in the network is handled and transmitted.Four road CAN bridges have four CAN branch roads, every branch road can increase new CAN bridge again, therefore can form large-scale CAN network, both can prolong the transmission range of network, particularly pass through after the relaying of several CAN bridges, can greatly extend transmission distance again, can reach several kms even tens kms; And every CAN branch road can be realized the selection of different routes between the heterogeneous networks, has strengthened the reliability of CAN network.
Further, as preferably, described CAN controller is CAN2.0B standard or ISO1198-1 standard CAN controllers.Carry four road interconnected CAN controllers, support the standard of CAN2.0B and ISO1198-1 fully, each CAN controller all can be realized the speed of 1Mbps, its overall situation is checked and accepted 11 and 29 Rx identifiers that filter can be identified all buses, with respect to the CAN controller of SJA1000 remarkable advantages is arranged.
Further, described microcontroller also is provided with the embedded high-speed Flash memory of 256 KB.The setting of embedded high-speed memory can make microcontroller move under maximum clock frequency, and power consumption is extremely low, and processing speed is exceedingly fast.
Further, as preferably, described microcontroller is LPC2194.Because therefore integrated four road CAN controllers of LPC2194 can realize four road CAN bus interface easily, have both reduced the scale of system, have improved the stability of system again.
Further, as preferably, described CAN transceiver module is CTM8251T.CTM8251T is the general CAN transceiver module that a band is isolated, and this inside modules is integrated, and all essential CAN isolate and the CAN transceiving devices, have isolation features and the effect of CAN-bus bus overvoltage protection of 2 500 V.This module meets the ISO11898 standard, therefore can defer to the CAN transceiver mutual operation of ISO11898 standard with other.
The present invention compared with prior art, have following advantage and a beneficial effect:
1 the present invention includes microcontroller, four CAN controllers and four CAN transceiver modules, described CAN controller links to each other with microcontroller respectively, four CAN transceiver modules link to each other with four CAN controllers respectively, can prolong the transmission range of network, particularly pass through after the relaying of several CAN bridges, can greatly extend transmission distance, can reach several kms even tens kms.
2 four road CAN bridges of the present invention not only can be expanded the CAN communication network, also have routing function simultaneously, can realize the different routes between the different CAN networks, the conversion of different communication speed, can play a key effect in large-scale CAN network.
Description of drawings
Fig. 1 is structured flowchart of the present invention.
Embodiment
Embodiment 1
As shown in Figure 1, present embodiment comprises microcontroller, four CAN controllers and four CAN transceiver modules, and described CAN controller links to each other with microcontroller respectively, and four CAN transceiver modules link to each other with four CAN controllers respectively.The integrated mode that microcontroller and CAN controller adopt, four CAN controllers are worked simultaneously, and the structure on each road is all identical with program, therefore can improve speed and the real-time of system; After system powered on, the CAN transceiver module linked to each other with the CAN bus by input and output interfaces, and the data in the CAN bus enter into microcontroller by the CAN controller, and microcontroller begins the information in the network is handled and transmitted.Four road CAN bridges have four CAN branch roads, every branch road can increase new CAN bridge again, therefore can form large-scale CAN network, both can prolong the transmission range of network, particularly pass through after the relaying of several CAN bridges, can greatly extend transmission distance again, can reach several kms even tens kms; And every CAN branch road can be realized the selection of different routes between the heterogeneous networks, has strengthened the reliability of CAN network.
Embodiment 2
As shown in Figure 1, present embodiment is on the basis of embodiment 1, and as preferably, described CAN controller is CAN2.0B standard or ISO1198-1 standard CAN controllers.Carry four road interconnected CAN controllers, support the standard of CAN2.0B and ISO1198-1 fully, each CAN controller all can be realized the speed of 1Mbps, its overall situation is checked and accepted 11 and 29 Rx identifiers that filter can be identified all buses, with respect to the CAN controller of SJA1000 remarkable advantages is arranged.
As preferably, described microcontroller is LPC2194.Because therefore integrated four road CAN controllers of LPC2194 can realize four road CAN bus interface easily, have both reduced the scale of system, have improved the stability of system again.
As preferably, described CAN transceiver module is CTM8251T.CTM8251T is the general CAN transceiver module that a band is isolated, and this inside modules is integrated, and all essential CAN isolate and the CAN transceiving devices, have isolation features and the effect of CAN-bus bus overvoltage protection of 2 500 V.This module meets the ISO11898 standard, therefore can defer to the CAN transceiver mutual operation of ISO11898 standard with other.
Embodiment 3
As shown in Figure 1, present embodiment is on the basis of embodiment 1 and embodiment 2, and described microcontroller also is provided with the embedded high-speed Flash memory of 256 KB.The setting of embedded high-speed memory can make microcontroller move under maximum clock frequency, and power consumption is extremely low, and processing speed is exceedingly fast.
Claims (5)
1. CAN bridge, it is characterized in that: comprise microcontroller, four CAN controllers and four CAN transceiver modules, described CAN controller links to each other with microcontroller respectively, and four CAN transceiver modules link to each other with four CAN controllers respectively.
2. a kind of CAN bridge according to claim 1, it is characterized in that: described CAN controller is CAN2.0B standard or ISO1198-1 standard CAN controllers.
3. a kind of CAN bridge according to claim 1, it is characterized in that: described microcontroller also is provided with the embedded high-speed Flash memory of 256 KB.
4. a kind of CAN bridge according to claim 1, it is characterized in that: described microcontroller is LPC2194.
5. a kind of CAN bridge according to claim 1, it is characterized in that: described CAN transceiver module is CTM8251T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102663813A CN103346946A (en) | 2013-06-28 | 2013-06-28 | CAN bridges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102663813A CN103346946A (en) | 2013-06-28 | 2013-06-28 | CAN bridges |
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| Publication Number | Publication Date |
|---|---|
| CN103346946A true CN103346946A (en) | 2013-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2013102663813A Pending CN103346946A (en) | 2013-06-28 | 2013-06-28 | CAN bridges |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202364253U (en) * | 2011-11-30 | 2012-08-01 | 安徽理工大学电子设备厂 | CAN repeater |
| CN202696644U (en) * | 2012-08-14 | 2013-01-23 | 成都思迈科技发展有限责任公司 | CAN bus based bridge with strong anti-interference capability and wide applicability |
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2013
- 2013-06-28 CN CN2013102663813A patent/CN103346946A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202364253U (en) * | 2011-11-30 | 2012-08-01 | 安徽理工大学电子设备厂 | CAN repeater |
| CN202696644U (en) * | 2012-08-14 | 2013-01-23 | 成都思迈科技发展有限责任公司 | CAN bus based bridge with strong anti-interference capability and wide applicability |
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Application publication date: 20131009 |