CN207965562U - CAN bus terminal resistance configuration circuit - Google Patents
CAN bus terminal resistance configuration circuit Download PDFInfo
- Publication number
- CN207965562U CN207965562U CN201820163400.8U CN201820163400U CN207965562U CN 207965562 U CN207965562 U CN 207965562U CN 201820163400 U CN201820163400 U CN 201820163400U CN 207965562 U CN207965562 U CN 207965562U
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- terminal resistance
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- circuit
- bus
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Abstract
The utility model provides a kind of CAN bus terminal resistance configuration circuit, including the master controller that is connected between the high position data line CAN_H of CAN bus and low data line CAN_L and several from controller；It connects between the port and the port of CAN_L of the master controller connection CAN_H terminal resistance；It is described to include the control relay circuit of terminal resistance from series connection one between the port and the port of CAN_L that controller connects CAN_H.Pass through the utility model, a terminal resistance is placed on each controller, it chooses whether two pins of terminal resistance being coupled with CAN_H and CAN_L according to actual needs, to make the controller of same hardware in system configure identical terminal resistance, the burden of the work such as production, storage and field adjustable is alleviated.
Description
Technical field
The utility model is related to the CAN bus terminal communications field more particularly to a kind of CAN bus terminal resistance configuration electricity
Road.
Background technology
CAN communication can be often used in automotive electronics and Industry Control, CAN protocol and standard disclosed in ISO11898-2
In specification, the physical layer of high-speed CAN requires the terminal resistance that the transmission main line both ends of CAN network respectively connect one 120 ohm, such as schemes
Shown in 3, in practical application, terminal resistance would generally be integrated on two controllers in CAN network, in certain applications occasion
Will appear has the identical controller of multiple hardware in the same CAN network, as a master controller connects multiple phases in BMS systems
Same slave controller.In this case, need integrated terminal resistance on the slave controller of CAN network trunk end, without
Whether the slave controller of end does not need integrated terminal resistance, will result in the controller of same hardware in this way, because integrated whole
It holds resistance and is divided into two kinds of controllers, make the module for increasing another type in system, production, storage, field adjustable can be increased
The burden of equal work.
Utility model content
In view of this, the main purpose of the utility model is to provide a kind of CAN bus terminal resistance configuration circuit, pass through
A terminal resistance is placed on each controller, chooses whether to distinguish two pins of terminal resistance according to actual needs
It is connected to CAN_H and CAN_L, to make the controller of same hardware in system configure identical terminal resistance, alleviates production, storehouse
The burden of the work such as storage and field adjustable.
The technical solution adopted in the utility model is a kind of CAN bus terminal resistance configuration circuit, including is connected to CAN
Master controller between the high position data line CAN_H and low data line CAN_L of bus and several from controller；
It connects between the port and the port of CAN_L of the master controller connection CAN_H terminal resistance；
It is described to include the relay of terminal resistance from series connection one between the port and the port of CAN_L that controller connects CAN_H
Device control circuit.
By upper, by the way that a terminal resistance in master controller and is each arranged from controller, it is ensured that identical hard in system
The controller of part configures identical terminal resistance, and according to actual needs, control relay circuit chooses whether to connect terminal resistance
Enter into CAN bus circuit, to realize that High Speed CAN Physical Layer transmission main line both ends need to connect the requirement of terminal resistance.
It is further improved, the control relay circuit includes:
One relay, coil one end connect a voltage source, and the other end is held in order to control, and normally-closed contact is separately connected CAN_
H and CAN_L, one terminal resistance of normally opened contact both ends series connection；
One triode, base stage connect a microcontroller, emitter ground connection, the control terminal of collector connection relay.
By upper, when the base stage of triode receives the high level signal of microcontroller transmission, triode ON, relay closes
It closes, driving normally opened contact is closed, and terminal resistance is connected to CAN bus circuit.
It is further improved, the circuit further includes the indicator light or alarm for being connected to microcontroller, for providing alarm
Effect.
By upper, indicator light or alarm can provide alarm function, when control relay circuit failure, cause CAN total
When line communication is impaired, it is possible to provide alarm.
It is further improved, the terminal resistance is 120 Ohmic resistances.
By upper, CAN bus both ends must connect terminal resistance and can just work normally, and terminal resistance should be with communication cable
Impedance it is identical, representative value is that 120 ohm of its effects are matching bus impedances, improves the anti-interference and reliably of data communication
Row.
Description of the drawings
Fig. 1 is the principle schematic of the utility model CAN bus terminal resistance configuration circuit.
Fig. 2 is the circuit diagram that the utility model terminal resistance automatically configures circuit.
Fig. 3 is the schematic diagram of current common CAN bus terminal resistance configuration
Specific implementation mode
The main purpose of the utility model is to provide a kind of CAN bus terminal resistance configuration circuits, by each
A terminal resistance is placed on controller, chooses whether two pins of terminal resistance being coupled with CAN_ according to actual needs
H and CAN_L alleviates production, storage and scene to make the controller of same hardware in system configure identical terminal resistance
The burden of the work such as debugging.
Below as shown in Fig. 1~Fig. 2, the utility model is described in detail, a kind of CAN bus terminal resistance configuration electricity
Road, including the master controller that is connected between the high position data line CAN_H of CAN bus and low data line CAN_L and it is several from
Controller；
Connect a terminal resistance R0 between the port and the port of CAN_L of the master controller connection CAN_H；
It is described to include the relay of terminal resistance from series connection one between the port and the port of CAN_L that controller connects CAN_H
Device control circuit, the control relay circuit include:
One relay KT, coil one end connect a voltage source VCC, and the other end is held in order to control, and normally-closed contact connects respectively
CAN_H and CAN_L are met, connect a terminal resistance R at normally opened contact both ends；
One triode Q1, base stage connect a microcontroller, emitter ground connection, the control of collector connection relay KT
End；
The master controller of the CAN bus circuit and a terminal resistance is each set from controller, is configured from controller
There is control relay circuit, when the base stage of triode Q1 receives the high level signal of microcontroller transmission, triode Q1 conductings, after
Electric appliance KT is closed, and driving normally opened contact is closed, and terminal resistance is connected to CAN bus circuit.
Foregoing circuit also may be selected that an indicator light or alarm is arranged in monolithic generator terminal, for providing alarm function.
Compared with prior art, the beneficial effects of the utility model are：
Simple in structure, reliability is high, by the way that a terminal resistance in master controller and is each arranged from controller, it is ensured that
The controller of same hardware configures identical terminal resistance in system, reduces the burden of the work such as production, storage and field adjustable；
It is easy to use, can according to actual needs, the shutdown of control relay circuit or closure choose whether terminal resistance
It is linked into CAN bus circuit, to realize that High Speed CAN Physical Layer transmission main line both ends need to connect the requirement of terminal resistance.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection domain within.
Claims (4)
1. a kind of CAN bus terminal resistance configuration circuit, which is characterized in that the high position data line including being connected to CAN bus
Master controller between CAN_H and low data line CAN_L and several from controller；
It connects between the port and the port of CAN_L of the master controller connection CAN_H terminal resistance；
It is described to include the relay control of terminal resistance from series connection one between the port and the port of CAN_L that controller connects CAN_H
Circuit processed.
2. circuit according to claim 1, which is characterized in that the control relay circuit includes:
One relay, coil one end connect a voltage source, and the other end holds in order to control, normally-closed contact be separately connected CAN_H and
CAN_L, one terminal resistance of normally opened contact both ends series connection；
One triode, base stage connect a microcontroller, emitter ground connection, the control terminal of collector connection relay.
3. circuit according to claim 2, which is characterized in that further include an indicator light for being connected to microcontroller or alarm
Device, for providing alarm function.
4. circuit according to claim 3, which is characterized in that the terminal resistance is 120 Ohmic resistances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820163400.8U CN207965562U (en) | 2018-01-30 | 2018-01-30 | CAN bus terminal resistance configuration circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820163400.8U CN207965562U (en) | 2018-01-30 | 2018-01-30 | CAN bus terminal resistance configuration circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207965562U true CN207965562U (en) | 2018-10-12 |
Family
ID=63736157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820163400.8U Expired - Fee Related CN207965562U (en) | 2018-01-30 | 2018-01-30 | CAN bus terminal resistance configuration circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207965562U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109343396A (en) * | 2018-10-18 | 2019-02-15 | 艾乐德电子（南京）有限公司 | A kind of and machine CAN build-out resistor automatic identification circuit |
| CN110401587A (en) * | 2019-08-15 | 2019-11-01 | 深圳麦格米特电气股份有限公司 | A kind of CAN expander and CAN network bus system |
| CN110730117A (en) * | 2019-11-07 | 2020-01-24 | 三一汽车起重机械有限公司 | Assembled davit and hoist based on CAN bus |
| CN111541116A (en) * | 2020-05-08 | 2020-08-14 | 广东博智林机器人有限公司 | Socket, terminal resistor automatic access device and servo driver |
| CN113497769A (en) * | 2020-03-20 | 2021-10-12 | 上海汽车集团股份有限公司 | Configuration method and device of CAN bus terminal resistor and related network topology |
| CN113859149A (en) * | 2021-09-26 | 2021-12-31 | 中国第一汽车股份有限公司 | Communication system and vehicle based on two ECU allies oneself with accuse |
-
2018
- 2018-01-30 CN CN201820163400.8U patent/CN207965562U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109343396A (en) * | 2018-10-18 | 2019-02-15 | 艾乐德电子（南京）有限公司 | A kind of and machine CAN build-out resistor automatic identification circuit |
| CN110401587A (en) * | 2019-08-15 | 2019-11-01 | 深圳麦格米特电气股份有限公司 | A kind of CAN expander and CAN network bus system |
| CN110730117A (en) * | 2019-11-07 | 2020-01-24 | 三一汽车起重机械有限公司 | Assembled davit and hoist based on CAN bus |
| CN110730117B (en) * | 2019-11-07 | 2022-04-15 | 三一汽车起重机械有限公司 | Assembled davit and hoist based on CAN bus |
| CN113497769A (en) * | 2020-03-20 | 2021-10-12 | 上海汽车集团股份有限公司 | Configuration method and device of CAN bus terminal resistor and related network topology |
| CN113497769B (en) * | 2020-03-20 | 2022-11-25 | 上海汽车集团股份有限公司 | Configuration method and device of CAN bus terminal resistor and related network topology |
| CN111541116A (en) * | 2020-05-08 | 2020-08-14 | 广东博智林机器人有限公司 | Socket, terminal resistor automatic access device and servo driver |
| CN111541116B (en) * | 2020-05-08 | 2021-06-08 | 广东博智林机器人有限公司 | Socket, terminal resistor automatic access device and servo driver |
| CN113859149A (en) * | 2021-09-26 | 2021-12-31 | 中国第一汽车股份有限公司 | Communication system and vehicle based on two ECU allies oneself with accuse |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20181012 Termination date: 20210130 |