CN203032573U - access structure of CAN bus terminal resistor - Google Patents
access structure of CAN bus terminal resistor Download PDFInfo
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- CN203032573U CN203032573U CN 201320025171 CN201320025171U CN203032573U CN 203032573 U CN203032573 U CN 203032573U CN 201320025171 CN201320025171 CN 201320025171 CN 201320025171 U CN201320025171 U CN 201320025171U CN 203032573 U CN203032573 U CN 203032573U
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- terminal resistance
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Abstract
The utility model relates to a CAN bus terminal resistance's access structure, CAN bus connection in this structure has a plurality of CAN nodes, and every CAN node is equipped with CAN _ H end and CAN _ L end, and every CAN node still is equipped with CAN _ M end, and is equipped with terminal resistance in every CAN node, this terminal resistance's one end with CAN _ H holds the connection, and the other end is held with CAN _ M and is connected, as CAN bus terminal's CAN _ L end and CAN _ M hold between be connected with the wire. The utility model discloses simple structure, convenient to use switches on and breaks off for connecting wire between CAN terminal control CAN _ L end and the CAN _ M end according to used CAN node. Compared with the prior art, the utility model discloses CAN not need to change the problem of terminal resistance position because of the quantity and the position change of CAN node.
Description
Technical field
The utility model relates to the terminal resistance of automobile CAN-bus, refers to a kind of access infrastructure of CAN bus termination resistance particularly.
Background technology
Along with the development of automotive electronic technology, the network-bus of automobile CAN-bus becomes increasingly complex, and the CAN number of nodes on the CAN bus is also more and more, and therefore the CAN number of nodes on the different CAN buses is different with the position.In addition, with a kind of vehicle since the configuration variation also can produce the CAN number of nodes situation different with the position.
Terminal resistance is used for absorbing the backward wave on the CAN bus, strengthens signal strength.There are the access of exterior terminal resistance and CAN intra-node that the terminal resistance dual mode is set at present, consider cost and arrange reason, generally carry terminal resistance by the CAN intra-node.Because the different positions of terminal resistance that can cause with the position of CAN number of nodes on the CAN bus change, and so just exist the CAN bus controller to have or not two kinds of situations of terminal resistance, thereby cause the difficulty on the part management.Be as the CAN bus termination as there being the CAN node in a certain vehicle, this CAN intranodal is provided with terminal resistance, and there is no this CAN node in other configuration in this same vehicle, and therefore just need reset terminal resistance by other CAN node in this vehicle, therefore increase the complexity of work.
Summary of the invention
Whether the purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art and access infrastructure that a kind of CAN bus termination resistance is provided, can be CAN bus termination and the resistance that accesses terminal easily according to the CAN node.
Realize that the technical scheme that the utility model purpose adopts is: a kind of access infrastructure of CAN bus termination resistance, described CAN bus is connected with a plurality of CAN nodes, each CAN node is provided with CAN_H end and CAN_L end, each CAN node also is provided with the CAN_M end, and each CAN intranodal is provided with terminal resistance, one end of this terminal resistance is connected with described CAN_H end, the other end and CAN_M end is connected, is connected with lead between holding as the CAN_L end of the CAN node of CAN bus termination and CAN_M in described a plurality of CAN nodes.
In technique scheme, described terminal resistance is 120 ohm.
The utility model is simple in structure, and is easy to use, whether is connection lead conducting and disconnection between CAN terminal control CAN_L end and the CAN_M end according to used CAN node.Compared with prior art, the utility model problem that can not need to change the terminal resistance position or change other CAN node structure because of the quantity of CAN node and change in location.
Description of drawings
Fig. 1 is the scheme drawing of the access infrastructure of the utility model CAN bus termination resistance.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
The access infrastructure of the CAN bus termination resistance shown in Fig. 1, CAN bus 400 is connected with a plurality of CAN nodes, present embodiment is that example describes to be connected with three CAN nodes, i.e. a CAN node 100, the two CAN nodes 200 and the 3rd CAN node 300 among Fig. 1.
The one CAN node 100 is provided with CAN_H end the 101, the one CAN_L end the 102 and the one CAN_M end 103, be provided with first terminal resistance 104 in the one CAN node 100, one end of terminal resistance 104 is connected with CAN_H end 101, the other end is connected with CAN_M end 103, and terminal resistance 104 is 120 ohm in the present embodiment.
The 2nd CAN node 200 is provided with the 2nd CAN_H end the 201, the 2nd CAN_L end the 202 and the 2nd CAN_M end 203, be provided with second terminal resistance 204 in the 2nd CAN node 200, one end of second terminal resistance 204 is connected with the 2nd CAN_H end 201, the other end is connected with the 2nd CAN_M end 203, and terminal resistance 204 is 120 ohm in the present embodiment.
In the present embodiment, the one CAN node 100 is the terminal of CAN bus 400, be communicated with lead with CAN_L end 102 with CAN_M end 103 and be connected this moment, and namely first terminal resistance 104 of this CAN intranodal is connected in the CAN bus 400, becomes the terminal resistance in the CAN bus 400.When the 2nd CAN node 200 is not the terminal of CAN bus 400 in the present embodiment, be off-state this moment between CAN_L end 202 and the CAN_M end 203, namely second terminal resistance 204 in the 2nd CAN node 200 disconnects, and can not influence the work of the 2nd CAN node 200.
In the present embodiment, if the 3rd CAN node 300 as the terminal of CAN bus 400, its structure is with a CAN node 100, if not as the terminal of CAN bus 400, its structure repeats no more with the 2nd CAN node 200 herein.
The use of the present utility model of following casehistory, for example: in a kind of configuration in certain vehicle, if the terminal that a certain CAN node is the CAN bus, the CAN_L end that then connects this moment in this CAN node gets final product with the CAN_M end; And under the another kind configuration, if the terminal that this CAN node is not the CAN bus, the CAN_L end that does not then connect this moment in this CAN node gets final product with the CAN_M end.Otherwise, if this CAN node is not the terminal of CAN bus, then do not connect CAN_L end and CAN_M end in this CAN node this moment in last configuration; If the CAN_L that then connects this moment in this CAN node for the terminal of CAN bus in one configuration of back holds the terminal that can become the CAN bus with the CAN_M end.Therefore, the utlity model has good commonality and alerting ability, be suitable for widespread use.
Claims (2)
1. the access infrastructure of a CAN bus termination resistance, described CAN bus is connected with a plurality of CAN nodes, each CAN node is provided with CAN_H end and CAN_L end, it is characterized in that: each CAN node also is provided with the CAN_M end, and each CAN intranodal is provided with terminal resistance, one end of this terminal resistance is connected with described CAN_H end, and the other end is connected with described CAN_M end; Be connected with lead between holding with CAN_M as the CAN_L end of the CAN node of CAN bus termination in described a plurality of CAN node.
2. the access infrastructure of CAN bus termination resistance according to claim 1, it is characterized in that: described terminal resistance is 120 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320025171 CN203032573U (en) | 2013-01-17 | 2013-01-17 | access structure of CAN bus terminal resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320025171 CN203032573U (en) | 2013-01-17 | 2013-01-17 | access structure of CAN bus terminal resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203032573U true CN203032573U (en) | 2013-07-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320025171 Expired - Fee Related CN203032573U (en) | 2013-01-17 | 2013-01-17 | access structure of CAN bus terminal resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203032573U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460445A (en) * | 2014-11-19 | 2015-03-25 | 上海航天电源技术有限责任公司 | CAN bus communication terminal resistor accessing method |
| CN112311640A (en) * | 2020-10-26 | 2021-02-02 | 宝能(广州)汽车研究院有限公司 | Vehicle-mounted CAN bus communication network and vehicle |
-
2013
- 2013-01-17 CN CN 201320025171 patent/CN203032573U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460445A (en) * | 2014-11-19 | 2015-03-25 | 上海航天电源技术有限责任公司 | CAN bus communication terminal resistor accessing method |
| CN112311640A (en) * | 2020-10-26 | 2021-02-02 | 宝能(广州)汽车研究院有限公司 | Vehicle-mounted CAN bus communication network and vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20210117 |