CN104460445A - CAN bus communication terminal resistor accessing method - Google Patents
CAN bus communication terminal resistor accessing method Download PDFInfo
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- CN104460445A CN104460445A CN201410661095.1A CN201410661095A CN104460445A CN 104460445 A CN104460445 A CN 104460445A CN 201410661095 A CN201410661095 A CN 201410661095A CN 104460445 A CN104460445 A CN 104460445A
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- level signal
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
Abstract
The invention discloses a CAN bus communication terminal resistor accessing method. The method comprises the following steps that a communication signal high-level output end of a CAN bus transmit-receive device is inserted into a high-level signal connecting groove of an electronic control unit connector, and a communication signal low-level output end is inserted into a low-level signal connecting groove; one end of a terminal resistor is connected with the communication signal low-level output end, and the other end of the terminal resistor is arranged in an impedance connecting groove of the electronic control unit connector; and according to whether the CAN bus transmit-receive device is placed at a CAN terminal position, the electronic control unit connector is connected with an abutting-inserting end connector. When the method is used in specific item application, special ECU customization is of no need, an external terminal resistor is of no need, and only by changing a wiring harness connecting mode, according to practical needs, the terminal resistor is selectively connected between the communication signal high-level output end and the communication signal low-level output end of the CAN bus transmit-receive device. The configurability of an ECU and the reliability of a CAN can be greatly improved.
Description
Technical field
The present invention relates to electronic control unit CAN communication partial circuit method for designing, be specifically related to a kind of CAN communication terminal resistance cut-in method.
Background technology
Controller area network is as a kind of multi-line network communicating system, flexible with its time-division many masters, non-destructive bus arbitration and automatic error request etc., the reliable communication technology, and cheap price, be widely used in automatic industrial manufacturing line, automobile, sensor, Medical Devices, Intelligent Building, elevator controlling, environmental Kuznets Curves distributed real-time system.
Owing to can form reflection wave at transmission-wire terminal when CAN signal is transmitted, interference original signal, so need to add terminal resistance in line end, does not reflect after making signal arrive line end.But at electronic control unit (Electronic Control Unit, be called for short ECU) design at the beginning of often cannot determine that this ECU will be in the position of whole CAN network in project application, therefore also just cannot determine whether need design ECU time interpolation terminal resistance.Mainly contain two schemes at present, the first scheme needs to carry out specific customization according to project demand to ECU; ECU production cost will be caused to improve.First scheme needs additionally to connect terminal resistance wire harness is upper outside, reduces CAN communication connection reliability.
Summary of the invention
The object of the present invention is to provide a kind of CAN communication terminal resistance cut-in method, by being arranged on by terminal resistance between the communication signal low level output end of CAN R-T unit and the impedance link slot of electronic control unit connector; In actual use, when with when being in CAN network terminal location at CAN R-T unit, by to spigot connector, terminal resistance is arranged between the communication signal low level output end of CAN R-T unit and communication signal high level output end, does not reflect after making signal arrive line end; When with when being in other positions of CAN network at CAN R-T unit, by spigot connector, terminal resistance is not connected between the communication signal low level output end of CAN R-T unit and communication signal high level output end.The present invention can make in detailed programs application, without the need to specific customization ECU, also without the need to external terminal resistance, by means of only change wire harness connected mode, according to the actual requirements, optionally terminal resistance is accessed between the communication signal low level output end and communication signal high level output end of CAN R-T unit; The present invention greatly can improve configurability and the CAN network reliability of ECU.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
A kind of CAN communication terminal resistance connecting system, be characterized in, this system comprises:
CAN R-T unit,
The input end of described CAN R-T unit comprises: receive data terminal, send data terminal, the output terminal of this CAN R-T unit comprises: communication signal high level output end, communication signal low level output end;
Reception data terminal, the transmission data terminal of described CAN R-T unit are connected with external electronic control unit;
Electronic control unit connector, is connected with the communication signal high level output end of described CAN R-T unit, communication signal low level output end;
To spigot connector, correspondingly with described electronic control unit connector to connect;
Terminal resistance, one end of described terminal resistance is connected with described communication signal low level output end, and the other end of this terminal resistance is connected with described electronic control unit connector.
Preferably, described electronic control unit connector comprises:
Connector plate,
High level signal link slot, is arranged on described connector plate side, and the communication signal high level output end of described CAN R-T unit inserts in described high level signal link slot;
Low level signal link slot, is arranged on described connector plate side, and the communication signal low level output end of described CAN R-T unit inserts in described low level signal link slot;
Impedance link slot, is arranged on described connector plate side, and one end of described terminal resistance is inserted in described impedance link slot;
High level signal output terminal, is arranged on described connector plate opposite side, and the input side of described high level signal output terminal is connected with described high level signal link slot;
Low level signal output terminal, is arranged on described connector plate opposite side, and the input side of described low level signal output terminal is connected with described low level signal link slot;
Impedance output, is arranged on the described connector plate other end, and the input side of described impedance output is connected with described impedance link slot.
Preferably, described spigot connector to be comprised:
Connector plate,
High level signal input end, is arranged on described connector plate side, and is connected with the outgoing side of described high level signal output terminal, the input side of outside CAN network bus high level end respectively;
Low level signal input end, is arranged on described connector plate side, and is connected with the outgoing side of described low level signal output terminal, the input side of outside CAN network bus low level end respectively;
Impedance input, is arranged on described connector plate side, and is connected with the outgoing side of described impedance output, the input side of external impedance output terminal respectively.
A kind of CAN communication terminal resistance cut-in method, be characterized in, the method comprises following steps:
S1, the communication signal high level output end of CAN R-T unit inserts the high level signal link slot of electronic control unit connector, and communication signal low level output end inserts low level signal link slot;
S2, one end of terminal resistance is connected with described communication signal low level output end, and the other end of described terminal resistance is arranged in the impedance link slot of described electronic control unit connector;
Whether S3, be in CAN network terminal location according to described CAN R-T unit, is connected by described electronic control unit connector with to spigot connector.
Preferably, described step S3 comprises following steps:
S3.1A, when described CAN R-T unit is not in CAN network terminal location, the input side of the described high level signal input end to spigot connector is connected with the outgoing side of the high level signal output terminal of control module connector, the input side of low level signal input end is connected with the outgoing side of low level signal output terminal, the input side of impedance input is connected with the outgoing side of impedance output.
Preferably, described step S3 comprises following steps:
S3.1B, when described CAN R-T unit is in CAN network terminal location, the input side of the described high level signal input end to spigot connector is connected with the outgoing side of the high level signal output terminal of control module connector, the input side of low level signal input end is connected with the outgoing side of low level signal output terminal, the input side of impedance input is connected with the outgoing side of impedance output;
S3.2B, the outgoing side of external impedance output terminal and the outgoing side of outside CAN network bus high level end are interconnected, and described terminal resistance is connected between described communication signal high level output end, the high electric low output terminal of communication signal.
The present invention compared with prior art has the following advantages:
A kind of CAN communication terminal resistance cut-in method provided by the invention, can make in a particular application, without the need to specific customization ECU, also without the need to external terminal resistance, by means of only change wire harness connected mode, according to the actual requirements, optionally terminal resistance is accessed between the communication signal low level output end and communication signal high level output end of CAN R-T unit; The present invention greatly can improve configurability and the CAN network reliability of ECU, can reduce ECU production cost simultaneously.
Accompanying drawing explanation
Fig. 1 is one of embodiment schematic diagram of a kind of CAN communication terminal of the present invention resistance cut-in method.
Fig. 2 is the embodiment schematic diagram two of a kind of CAN communication terminal of the present invention resistance cut-in method.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As shown in Figure 1, a kind of CAN communication terminal resistance connecting system, this system comprises: CAN R-T unit 10, electronic control unit connector 20, to spigot connector 30 and terminal resistance 40.
Wherein, the input end of CAN R-T unit 10 comprises: receive data terminal 11, send data terminal 12, the output terminal of this CAN R-T unit 10 comprises: communication signal high level output end 13, communication signal low level output end 14.Receive data terminal 11, transmission data terminal 12 is connected with external electronic control unit.
Communication signal high level output end 13, the communication signal low level output end 14 of electronic control unit connector 20 and CAN R-T unit 10 are connected.Connect spigot connector 30 is corresponding with electronic control unit connector 20.One end of terminal resistance 40 is connected with communication signal low level output end 14, and the other end of this terminal resistance 40 is connected with electronic control unit connector 20.
As shown in Figure 1, in the present embodiment, the resistance of terminal resistance 40 is 120 Ω.CAN R-T unit 10 is CAN Transceiver, receives the TXD end that RXD holds, transmission data terminal 12 is CAN Transceiver that data terminal 11 is CAN Transceiver.Electronic control unit connector 20 is ECU connector.
Electronic control unit connector 20 comprises: connector plate 27, high level signal link slot 21, low level signal link slot 22, impedance link slot 23, high level signal output terminal 24, low level signal output terminal 26 and impedance output 25.
High level signal link slot 21 is arranged on connector plate 27 side, receives data terminal 11 and inserts in high level signal link slot 21.Low level signal link slot 22 is arranged on connector plate 27 side, sends data terminal 12 and inserts in low level signal link slot 22.
Impedance link slot 23 is arranged on connector plate 27 side, and one end of terminal resistance 40 is inserted in impedance link slot 23.One end of terminal resistance 40 is connected with electronic control unit connector 20, and the other end of this terminal resistance 40 is connected with the communication signal low level output end 14 of CAN R-T unit 10.
High level signal output terminal 24 is arranged on connector plate 27 opposite side, and the input side of this high level signal output terminal 24 is connected with high level signal link slot 21; Low level signal output terminal 26 is arranged on connector plate 27 opposite side, and the input side of this low level signal output terminal 26 is connected with low level signal link slot 22; Impedance output 25 is arranged on connector plate 27 other end, is connected with impedance link slot 23.
Spigot connector 30 is comprised: connector plate 37, and be arranged on the high level signal input end 31 of connector plate 37 side, low level signal input end 33 and impedance input 32.
High level signal input end 31 is connected with the outgoing side of high level signal output terminal 24, the input side of outside CAN network bus high level end 34 respectively.Low level signal input end 33 is connected with the outgoing side of low level signal output terminal 26, the input side of outside CAN network bus low level end 36 respectively.Impedance input 32 is connected with the outgoing side of impedance input 32, the input side of external impedance output terminal 35 respectively.
As shown in Figure 1 and Figure 2, in the present embodiment, communication signal high level output end 13 is ECU_CANH end, the high electric low output terminal 14 of communication signal is ECU_CANL end.High level signal output terminal 24 is pin1 pin, low level signal output terminal 26 is pin3 pin, and impedance output 25 is pin2 pin.High level signal input end 31 is pin4 pin, and low level signal input end 33 is pin6 pin, and impedance input 32 is pin5 pin.Pin4 pin is held with pin1 pin, NET_CANH respectively and is connected, and pin6 pin is held with pin3 pin, NET_CANL respectively and is connected.
A kind of CAN communication terminal resistance cut-in method, the method comprises following steps:
S1, the high electric low output terminal 14 of the communication signal high level output end 13 of CAN R-T unit 10, communication signal respectively with the high level signal link slot 21 of electronic control unit connector 20, low level signal link slot 22 is corresponding connects.
In the present embodiment, the ECU_CANH end of CAN R-T unit 10 inserts high level signal link slot 21, the ECU_CANL end insertion low level signal link slot 22 of electronic control unit connector 20.
S2, one end of terminal resistance 40 is connected with communication signal low level output end 14, and the other end of terminal resistance 40 is arranged in the impedance link slot 23 of electronic control unit connector 20.
In the present embodiment, one end of terminal resistance 40 is held with ECU_CANL and is connected, and the other end of this terminal resistance 40 inserts in impedance link slot 23.
Whether S3, be in CAN network terminal location according to CAN R-T unit 10, be connected by electronic control unit connector 20 with to spigot connector 30.
One of embodiment as shown in Figure 1, step S3 comprises following steps:
S3.1A, when CAN R-T unit 10 is not in CAN network terminal location, the input side of the high level signal input end 31 of spigot connector 30 is connected with the outgoing side of the high level signal output terminal 24 of control module connector 20, the input side of low level signal input end 33 is connected with the outgoing side of low level signal output terminal 26, the input side of impedance input 32 is connected with the outgoing side of impedance output 25.
In the present embodiment, pin1 pin is connected with pin4 pin, and pin2 pin is connected with pin5 pin, and pin3 pin is connected with pin6 pin.
In the present embodiment, when CAN R-T unit 10 is in other positions of non-CAN network terminal, vacant state is in, when normally working to the pin5 pin of spigot connector 30, between communication signal high level output end 13, the high electric low output terminal 14 of communication signal, there is not terminal resistance 40.
Embodiment two as shown in Figure 2, step S3 comprises following steps:
S3.1B, when CAN R-T unit 10 is in CAN network terminal location, the input side of the high level signal input end 31 of spigot connector 30 is connected with the outgoing side of the high level signal output terminal 24 of control module connector 20, the input side of low level signal input end 33 is connected with the outgoing side of low level signal output terminal 26, the input side of impedance input 32 is connected with the outgoing side of impedance output 25.
S3.2B, external impedance output terminal (35) and outside CAN network bus high level end 34 are interconnected, and terminal resistance 40 is connected between communication signal high level output end 13, the high electric low output terminal 14 of communication signal.
In the present embodiment, pin1 pin is connected with pin4 pin, and pin2 pin is connected with pin5 pin, and pin3 pin is connected with pin6 pin.Wherein, NET_CANH end is connected with external impedance output terminal 35, makes terminal resistance 40 access between ECU_CANH end and ECU_CANL are held; Thus do not reflect after making signal arrive line end.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (6)
1. a CAN communication terminal resistance connecting system, is characterized in that, this system comprises:
CAN R-T unit (10),
The input end of described CAN R-T unit (10) comprises: receive data terminal (11), send data terminal (12), the output terminal of this CAN R-T unit (10) comprises: communication signal high level output end (13), communication signal low level output end (14);
Reception data terminal (11), transmission data terminal (12) of described CAN R-T unit (10) are connected with external electronic control unit;
Electronic control unit connector (20), is connected with the communication signal high level output end (13) of described CAN R-T unit (10), communication signal low level output end (14);
To spigot connector (30), correspondingly with described electronic control unit connector (20) to connect;
Terminal resistance (40), one end of described terminal resistance (40) is connected with described communication signal low level output end (14), and the other end of this terminal resistance (40) is connected with described electronic control unit connector (20).
2. CAN communication terminal resistance connecting system as claimed in claim 1, it is characterized in that, described electronic control unit connector (20) comprises:
Connector plate (27),
High level signal link slot (21), is arranged on described connector plate (27) side, and the communication signal high level output end (13) of described CAN R-T unit (10) inserts in described high level signal link slot (21);
Low level signal link slot (22), is arranged on described connector plate (27) side, and the communication signal low level output end (14) of described CAN R-T unit (10) inserts in described low level signal link slot (22);
Impedance link slot (23), is arranged on described connector plate (27) side, and one end of described terminal resistance (40) is inserted in described impedance link slot (23);
High level signal output terminal (24), is arranged on described connector plate (27) opposite side, and the input side of described high level signal output terminal (24) is connected with described high level signal link slot (21);
Low level signal output terminal (26), is arranged on described connector plate (27) opposite side, and the input side of described low level signal output terminal (26) is connected with described low level signal link slot (22);
Impedance output (25), is arranged on described connector plate (27) other end, and the input side of described impedance output (25) is connected with described impedance link slot (23).
3. CAN communication terminal resistance connecting system as claimed in claim 2, is characterized in that, describedly comprises spigot connector (30):
Connector plate (37),
High level signal input end (31), is arranged on described connector plate (37) side, and is connected with the outgoing side of described high level signal output terminal (24), the input side of outside CAN network bus high level end (34) respectively;
Low level signal input end (33), is arranged on described connector plate (37) side, and is connected with the outgoing side of described low level signal output terminal (26), the input side of outside CAN network bus low level end (36) respectively;
Impedance input (32), is arranged on described connector plate (37) side, and is connected with the outgoing side of described impedance output (25), the input side of external impedance output terminal (35) respectively.
4. a CAN communication terminal resistance cut-in method, it is characterized in that, the method comprises following steps:
S1, the communication signal high level output end (13) of CAN R-T unit (10) inserts the high level signal link slot (21) of electronic control unit connector (20), and communication signal low level output end (14) inserts low level signal link slot (22);
S2, one end of terminal resistance (40) is connected with described communication signal low level output end (14), and the other end of described terminal resistance (40) is arranged in the impedance link slot (23) of described electronic control unit connector (20);
Whether S3, be in CAN network terminal location according to described CAN R-T unit (10), described electronic control unit connector (20) is connected with to spigot connector (30).
5. CAN communication terminal resistance cut-in method as claimed in claim 4, it is characterized in that, described step S3 comprises following steps:
S3.1A, when described CAN R-T unit (10) is not in CAN network terminal location, the input side of the described high level signal input end (31) to spigot connector (30) is connected with the outgoing side of the high level signal output terminal (24) of control module connector (20), the input side of low level signal input end (33) is connected with the outgoing side of low level signal output terminal (26), the input side of impedance input (32) is connected with the outgoing side of impedance output (25).
6. CAN communication terminal resistance cut-in method as claimed in claim 4, it is characterized in that, described step S3 comprises following steps:
S3.1B, when described CAN R-T unit (10) is in CAN network terminal location, the input side of the described high level signal input end (31) to spigot connector (30) is connected with the outgoing side of the high level signal output terminal (24) of control module connector (20), the input side of low level signal input end (33) is connected with the outgoing side of low level signal output terminal (26), the input side of impedance input (32) is connected with the outgoing side of impedance output (25);
S3.2B, the outgoing side of external impedance output terminal (35) and the outgoing side of outside CAN network bus high level end (34) are interconnected, and described terminal resistance (40) is connected between described communication signal high level output end (13), the high electric low output terminal (14) of communication signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410661095.1A CN104460445A (en) | 2014-11-19 | 2014-11-19 | CAN bus communication terminal resistor accessing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410661095.1A CN104460445A (en) | 2014-11-19 | 2014-11-19 | CAN bus communication terminal resistor accessing method |
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| CN104460445A true CN104460445A (en) | 2015-03-25 |
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| CN201410661095.1A Pending CN104460445A (en) | 2014-11-19 | 2014-11-19 | CAN bus communication terminal resistor accessing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656710A (en) * | 2016-12-13 | 2017-05-10 | 东莞力朗电池科技有限公司 | Automatic access circuit of CAN bus terminal resistor |
| CN111711552A (en) * | 2020-06-05 | 2020-09-25 | 广东博智林机器人有限公司 | Terminal resistor access circuit, servo driver and control system |
| CN114285694A (en) * | 2021-12-31 | 2022-04-05 | 上海捷氢科技股份有限公司 | Fuel cell system and CAN network terminal resistor circuit thereof |
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| JPH04326832A (en) * | 1991-04-26 | 1992-11-16 | Pioneer Electron Corp | Terminal resistor connecting device |
| CN201698226U (en) * | 2010-04-15 | 2011-01-05 | 浙江吉利汽车研究院有限公司 | Optimizing and testing system of CAN bus |
| CN203032573U (en) * | 2013-01-17 | 2013-07-03 | 东风汽车股份有限公司 | access structure of CAN bus terminal resistor |
| CN203799198U (en) * | 2014-02-24 | 2014-08-27 | 上海汽车集团股份有限公司 | Control module enabling CAN terminal resistor to be intelligently accessed |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04326832A (en) * | 1991-04-26 | 1992-11-16 | Pioneer Electron Corp | Terminal resistor connecting device |
| CN201698226U (en) * | 2010-04-15 | 2011-01-05 | 浙江吉利汽车研究院有限公司 | Optimizing and testing system of CAN bus |
| CN203032573U (en) * | 2013-01-17 | 2013-07-03 | 东风汽车股份有限公司 | access structure of CAN bus terminal resistor |
| CN203799198U (en) * | 2014-02-24 | 2014-08-27 | 上海汽车集团股份有限公司 | Control module enabling CAN terminal resistor to be intelligently accessed |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656710A (en) * | 2016-12-13 | 2017-05-10 | 东莞力朗电池科技有限公司 | Automatic access circuit of CAN bus terminal resistor |
| CN111711552A (en) * | 2020-06-05 | 2020-09-25 | 广东博智林机器人有限公司 | Terminal resistor access circuit, servo driver and control system |
| CN114285694A (en) * | 2021-12-31 | 2022-04-05 | 上海捷氢科技股份有限公司 | Fuel cell system and CAN network terminal resistor circuit thereof |
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