CN110401587A - A kind of CAN expander and CAN network bus system - Google Patents
A kind of CAN expander and CAN network bus system Download PDFInfo
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- CN110401587A CN110401587A CN201910755092.7A CN201910755092A CN110401587A CN 110401587 A CN110401587 A CN 110401587A CN 201910755092 A CN201910755092 A CN 201910755092A CN 110401587 A CN110401587 A CN 110401587A
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- 238000003032 molecular docking Methods 0.000 claims abstract description 28
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000007667 floating Methods 0.000 description 3
- 230000011514 reflex Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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Abstract
The present embodiments relate to fields of communication technology, disclose a kind of CAN expander and CAN network bus system, the CAN expander includes the first docking unit, second docking unit and switching circuit, the switching circuit is connected between the first connectivity port in the first docking unit and the second connection end mouth of the second docking unit, and the switching circuit includes terminal resistance, this is arranged between the first high position data port and the first low data port in the first docking unit, switching circuit is used for the level according to the first connectivity port and second connection end mouth, on-off of the controlling terminal resistance between first high position data port and first low data port, to realize automatically accessing for controlling terminal resistance.
Description
Technical field
The present embodiments relate to field of communication technology, in particular to a kind of CAN expander and CAN network bus system.
Background technique
Controller local area network (Controller Area Network, referred to as: CAN) bus is that one kind can be used in structure
Build the fieldbus of serial communication network.According to transmission line theory, signal transmits in transmission line, and transmission range is more than certain
When length, the anti-interference ability of communication bus just will appear decline, if encountering discontinuous transmission medium, it may occur that reflection is existing
As principle and the optical signal of, the reflex from a kind of medium enter another medium, that the principle of reflex can occur is similar.
Since the impedance of CAN bus transceiver is relatively high, constitute CAN bus a pair of of differential lines be each other it is isolated, do not connect
To together, when signal is transferred to the end of a line in CAN bus, reflex, back wave and signal wave will occur
Superposition, can be such that signal waveform is distorted, and CAN bus transceiver will be made to receive the data of mistake, cause communication mistake.Cause
This, can add terminal resistance similar in a characteristic impedance with transmission line to eliminate reflection by the head and the tail both ends in CAN bus
Phenomenon, to guarantee the signal stabilization of communication bus.
During realizing the embodiment of the present invention, inventor's discovery is above, and at least there are the following problems in the related technology: section
Point is the communication being attached by CAN expander between CAN bus realization node, is placed in CAN bus head and the tail both ends
CAN expander needs access terminal resistance, when needing to access new node, after needing artificial judgment to access new node, is
No have and the CAN bus at only head and the tail both ends is included in terminal resistance, and the terminal resistance at connection setting head and the tail both ends manually, very
Trouble.
Summary of the invention
In view of the above drawbacks of the prior art, the purpose of the embodiment of the present invention is that terminal electricity can be automatically accessed by providing one kind
The CAN expander and CAN network bus system of resistance.
The purpose of the embodiment of the present invention is that be achieved through the following technical solutions:
In order to solve the above technical problems, in a first aspect, providing a kind of CAN expander in the embodiment of the present invention, comprising:
First docking unit, comprising: the first high position data port, the first low data port, the first connectivity port and connect
Ground port；
Second docking unit, comprising: the second high position data port, the second low data port, second connection end mouth and electricity
Source port, second high position data port are connect with first high position data port, second low data port with
The connection of first low data port；
Switching circuit is connected between first connectivity port and the second connection end mouth, the switching circuit packet
Terminal resistance is included, the terminal resistance is arranged between first high position data port and first low data port,
The switching circuit is used for the level according to first connectivity port and the second connection end mouth, controls the terminal resistance
On-off between first high position data port and first low data port.
In some embodiments, the switching circuit includes:
Switch unit；
Terminal resistance, one end are connect with first high position data port, and the other end passes through the switch unit
It is connect with first low data port.
In some embodiments, the switch unit includes relay, and the relay includes common pin, normally opened draws
Foot, normally closed pin, coil output pin and coil input pin, the common pin are connect with the first low data port, institute
It states normally closed pin to connect with first high position data port, the coil input pin is connect with first connectivity port.
In order to solve the above technical problems, second aspect, a kind of CAN network bus system is provided in the embodiment of the present invention,
It include: CAN bus and at least two CAN expanders as described in above-mentioned first aspect, at least two CAN expander
It is communicated to connect respectively with the CAN bus.
In some embodiments, the CAN network bus system further include:
At least two nodes, a node is corresponding to be communicated to connect with a CAN expander, and at least two node passes through
The CAN bus communication connection.
In some embodiments, the node includes:
CAN bus transceiver, a CAN bus transceiver correspondence are connect with a CAN expander；
CAN controller, the CAN controller are connect with the CAN bus transceiver communications.
Compared with prior art, the beneficial effect of the embodiment of the present invention is: being in contrast to the prior art, the present invention is real
It applies and provides a kind of CAN expander and CAN network bus system in example, which includes CAN bus and at least
Two CAN expanders, at least two CAN expander are communicated to connect by CAN bus, which includes the first docking
Unit, the second docking unit and switching circuit, the switching circuit are connected to the first connectivity port in the first docking unit and the
Between the second connection end mouth of two docking units, and the switching circuit includes terminal resistance, and the setting is in the first docking unit
The first high position data port and the first low data port between, switching circuit be used for according to the first connectivity port and second connect
The level of port is connect, controlling terminal resistance is logical between first high position data port and first low data port
It is disconnected, to realize automatically accessing for controlling terminal resistance.
Detailed description of the invention
It is illustrated in one or more embodiments by the picture in corresponding attached drawing, these are exemplary
Illustrate not constitute the restriction to embodiment, the element/module and step in attached drawing with same reference numbers label are expressed as
Similar element/module and step, unless there are special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a kind of structural schematic diagram of CAN expander provided in an embodiment of the present invention；
Fig. 2 is the electrical connection schematic diagram of switch unit and terminal resistance provided in an embodiment of the present invention；
Fig. 3 is a kind of structural block diagram of CAN network bus system provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of CAN network bus system provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of node provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, under the premise of not departing from design of the embodiment of the present invention, various modifications and improvements can be made.These are belonged to
Protection scope of the present invention.
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, not
For limiting the application.
It should be noted that each feature in the embodiment of the present invention can be combined with each other, in this Shen if do not conflicted
Within protection scope please.In addition, though functional module division has been carried out in schematic device, but in some cases,
It can be divided with the module being different from device.In addition, the printed words such as " first " employed herein, " second " not to data and
Execution order is defined, and is distinguished to function and the essentially identical identical entry of effect or similar item.
Unless otherwise defined, technical and scientific term all used in this specification and belong to the embodiment of the present invention
The normally understood meaning of those skilled in the art is identical.In the used in the description of the embodiment of the present invention in this specification
Term be only for the purpose of describing specific embodiments, be not intended to limitation the embodiment of the present invention.This specification is made
Term "and/or" includes any and all combinations of one or more related listed items.
In addition, as long as technical characteristic involved in the various embodiments of the present invention described below is each other not
Constituting conflict can be combined with each other.
Specifically, with reference to the accompanying drawing, the embodiment of the present invention is further elaborated.
Embodiment one
The embodiment of the invention provides a kind of CAN expanders, are a kind of CAN provided in an embodiment of the present invention referring to Figure 1
The structural schematic diagram of expander, the CAN expander 100 include: the first docking unit 110, second docking unit 120 and switch
Circuit 130.
The first docking unit 110 includes: the first high position data port Can+, the first low data port Can-, the
One connectivity port A and grounding ports GND.
The second docking unit 120 includes: the second high position data port Can+, the second low data port Can-, the
Two connectivity port B and power port VCC, second high position data port Can+ and first high position data port Can+ connect
It connects, second low data port Can- is connect with first low data port Can-.
The switching circuit 130 is connected between the first connectivity port A and the second connection end mouth B, described to open
Powered-down road 130 includes terminal resistance R0, and terminal resistance R0 setting is in first high position data port Can+ and described the
Between one low data port Can-, the switching circuit 130 is used for according to the first connectivity port A and second connection
The level of port B controls the terminal resistance R0 in first high position data port Can+ and first low data end
On-off between mouth Can-.
A kind of CAN expander is provided in the embodiment of the present invention, which includes the first docking unit, second pair
Unit is docked in order member and switching circuit, the first connectivity port and second which is connected in the first docking unit
Between second connection end mouth, and the switching circuit includes terminal resistance, and the first seniority top digit in the first docking unit is arranged in this
According between port and the first low data port, switching circuit is used for the electricity according to the first connectivity port and second connection end mouth
It is flat, on-off of the controlling terminal resistance between first high position data port and first low data port, to realize
Controlling terminal resistance automatically accesses.
In some embodiments, continuing with referring to Fig. 1, the switching circuit 130 includes: switch unit 131 and the end
Hold resistance R0.
The one end the terminal resistance R0 is connect with first high position data port Can+, and the other end is opened by described
Unit 131 is closed to connect with first low data port Can-.In embodiments of the present invention, the terminal resistance R0 usually may be used
To use resistance value for 120 ohm of resistance, in actual use, it is also necessary to be adjusted according to the actual situation, the terminal
The resistance value of resistance R0 should be determined by the characteristic impedance of transmission cable, for example, the characteristic impedance of twisted pair is 120 ohm, then
Two endpoints of head and the tail in CAN bus should also integrate 120 ohm of terminal resistance.And CAN bus is the long haul communication the case where
Under, 120 ohm of resistance also may not be suitable, just needs to adjust at this time.With the Shielded Twisted Pair of 1.5 square millimeters of line footpaths of standard
For: the CAN bus of 1KM-2KM, termination resistance value should take 120 ohm；The CAN bus of 3KM or so and the above length, end
The resistance value of end resistance should at least take 160 ohm；The resistance value of the CAN bus of 4KM or so and the above length, terminal resistance is answered
At least take 220 ohm；The resistance value of the CAN bus of 10KM or so and the above length, terminal resistance should at least take 390 ohm.
In some embodiments, Fig. 2 is referred to, is switch unit and terminal resistance provided in an embodiment of the present invention for Fig. 2
Electrical connection schematic diagram.Based on CAN expander described in Fig. 1 and its related embodiment, the switch unit 131 and the end
Holding resistance R0 includes but is not limited to following characteristics and electric connecting relation:
The switch unit 131 includes relay J1, and the relay J1 is normally closed relay, and the relay J1 includes
Common pin 3, normally opened pin 4, normally closed pin 5, coil output pin 1 and coil input pin 2, the common pin 3 and
One low data port Can- connection, the normally closed pin 5 are connect with first high position data port Can+, and the coil is defeated
Enter pin 2 to connect with the first connectivity port A.
In other some embodiments, the switch unit 131 is also possible to the switch on and off device such as optocoupler, is not limited to
Relay described in the embodiment of the present application, correspondingly, the switching device also needs to be provided with such as above-mentioned five pins, to realize
Control whether the terminal resistance R0 accesses the first seniority top digit according to the level difference of the first connectivity port A and second connection end mouth B
According between port Can+ and the first low data port Can-, it specifically, can be configured according to actual needs, not need to adhere rigidly to
In the restriction of the embodiment of the present application.
When the first connectivity port A or the second connection end mouth B are placed in floating state, contact K1 connection is described public
Pin 3 and the normally closed pin 5, the normally closed relay J1 be placed in it is normally closed, in terminal resistance R0 access circuit；Described
One connectivity port A is connect with power port VCC, and when the second connection end mouth B is connect with ground terminal GND, the contact K1
Connect the common pin 3 and the normally opened pin 4, the normally closed relay J1 is placed in normally opened, and the terminal resistance R0 does not connect
Enter in circuit.
Embodiment two
The embodiment of the invention provides a kind of CAN network bus systems, refer to Fig. 3, are provided in an embodiment of the present invention
A kind of structural block diagram of CAN network bus system, the CAN network bus system 200 include: CAN bus and at least two
Such as above-mentioned CAN expander 100 described in any one of claims 1-6, at least two CAN expander 100 respectively with it is described
CAN bus communication connection.
In embodiments of the present invention, the CAN expander 100 is provided with n, therefore, the total linear system of CAN network shown in Fig. 3
Be provided in system CAN expander 100-1, CAN expander 100-2 ..., CAN expander 100-n, wherein n indicate positive integer.
It should be noted that can be the extension of CAN described in above-described embodiment one as CAN expander in this present embodiment
Device, therefore, the corresponding contents of CAN expander are equally applicable to the present embodiment in embodiment one, and and will not be described here in detail.
The CAN network bus system provided in the embodiment of the present invention includes that CAN bus includes at least two CAN expanders,
At least two CAN expander is communicated to connect by CAN bus, which can pass through the CAN expander
Control the access of the terminal resistance in the CAN expander for being linked at CAN bus head and the tail both ends.
Specifically, Fig. 4, a kind of structural schematic diagram of CAN network bus system provided in an embodiment of the present invention are referred to.Figure
4 by taking three CAN expanders as an example, including expander 100-1, CAN expander 100-2 and CAN expander 100-3.Wherein,
In one CAN expander, the first connectivity port A is floating state Float, does not access extraneous power supply VCC, second connection end mouth B
It is connect with the grounding ports GND in third CAN expander, circuit relay electric appliance J1 as shown in Figure 2 is not turned on, and relay J1 is set
In normally closed, terminal resistance R0 access；Electricity in second CAN expander, in the first connectivity port A and first CAN expander
Source port VCC connection, second connection end mouth B are connect with the grounding ports GND in third CAN expander, and relay J1 is placed in
Normally opened, terminal resistance R0 is not accessed；Electricity in third CAN expander, in the first connectivity port A and second CAN expander
Source port VCC connection, second connection end mouth B are floating state Float, and unearthed, circuit relay electric appliance J1 as shown in Figure 2 is not led
Logical, relay J1 is placed in normally closed, terminal resistance R0 access.
As described above, CAN network bus system provided in an embodiment of the present invention can be realized by the CAN expander
CAN bus head and the tail both ends automatically access terminal resistance.The present invention passes through the first docking unit and the second docking unit matching access
The terminal resistance of CAN bus carries out not needing artificially to judge cascade in cascade CAN network bus system in multiple nodes
Head and the tail both ends in CAN network bus system, at random in configuration CAN network bus system interior joint module, terminal resistance can be certainly
The dynamic whole story for being linked into CAN network bus system, it is simple and fast, it is time saving and energy saving.
In some embodiments, continuing with referring to Fig. 3, the CAN network bus system 200 further include: at least two sections
Point 210, a node 210 is corresponding to be communicated to connect with a CAN expander 100, and at least two node 210 passes through described
CAN bus communication connection.The node 210 can be all kinds of electronic components for needing to be communicatively coupled by CAN bus
Or communication network.
In some embodiments, Fig. 5 is referred to, is a kind of structural schematic diagram of node provided in an embodiment of the present invention, section
Point 210 includes: CAN bus transceiver 220 and CAN controller 230, and a CAN bus transceiver is corresponding and described in one
The connection of CAN expander, the CAN controller are connect with the CAN bus transceiver communications.
The CAN bus transceiver 220 is the physical layer of CAN bus, for binary code stream to be converted to differential signal
It sends, or differential signal is converted into binary code stream and is received, the CAN bus transceiver 220 passes through the CAN expander
100 with CAN bus physical connection.
The CAN controller 230 for realizing CAN bus agreement bottom and data link layer, for generating
CAN frame is simultaneously sent to the CAN bus transceiver 220 in a manner of the binary code stream.
A kind of CAN expander and CAN network bus system, the CAN network bus system are provided in the embodiment of the present invention
Including CAN bus and at least two CAN expanders, which is communicated to connect by CAN bus, which expands
Exhibition device includes that the first docking unit, the second docking unit and switching circuit, the switching circuit are connected in the first docking unit
Between first connectivity port and the second connection end mouth of the second docking unit, and the switching circuit includes terminal resistance, the setting
Between the first high position data port and the first low data port in the first docking unit, switching circuit is used for according to first
The level of connectivity port and second connection end mouth, controlling terminal resistance is in first high position data port and first low level
On-off between data port, to realize automatically accessing for controlling terminal resistance.
It should be noted that the apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The unit that part illustrates may or may not be physically separated, and component shown as a unit can be or can also
Not to be physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to reality
Need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；At this
Under the thinking of inventive embodiments, it can also be combined, walk between the technical characteristic in above embodiments or different embodiments
Suddenly it can be realized with random order, and there are many other variations of the different aspect of embodiment present invention as described above, be
Simplicity, they do not provide in details；Although the embodiment of the present invention is described in detail with reference to the foregoing embodiments,
Those skilled in the art should understand that: it can still repair technical solution documented by foregoing embodiments
Change or equivalent replacement of some of the technical features；And these are modified or replaceed, and do not make corresponding technical solution
Essence departs from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. a kind of CAN expander characterized by comprising
First docking unit, comprising: the first high position data port, the first low data port, the first connectivity port and ground terminal
Mouthful；
Second docking unit, comprising: the second high position data port, the second low data port, second connection end mouth and power end
Mouthful, second high position data port connect with first high position data port, second low data port with it is described
The connection of first low data port；
Switching circuit is connected between first connectivity port and the second connection end mouth, and the switching circuit includes eventually
Resistance is held, the terminal resistance is arranged between first high position data port and first low data port, described
Switching circuit is used for the level according to first connectivity port and the second connection end mouth, controls the terminal resistance in institute
State the on-off between the first high position data port and first low data port.
2. CAN expander according to claim 1, which is characterized in that the switching circuit includes:
Switch unit；
Terminal resistance, one end are connect with first high position data port, and the other end passes through the switch unit and institute
State the connection of the first low data port.
3. CAN expander according to claim 2, which is characterized in that
The switch unit includes relay, and the relay includes common pin, normally opened pin, normally closed pin, coil output
Pin and coil input pin, the common pin are connect with the first low data port, the normally closed pin and described first
The connection of high position data port, the coil input pin are connect with first connectivity port.
4. a kind of CAN network bus system characterized by comprising CAN bus and at least two such as the claims
The described in any item CAN expanders of 1-3, at least two CAN expander are communicated to connect with the CAN bus respectively.
5. CAN network bus system according to claim 4, which is characterized in that further include:
At least two nodes, a node is corresponding to be communicated to connect with a CAN expander, and at least two node passes through described
CAN bus communication connection.
6. CAN network bus system according to claim 5, which is characterized in that the node includes:
CAN bus transceiver, a CAN bus transceiver correspondence are connect with a CAN expander；
CAN controller, the CAN controller are connect with the CAN bus transceiver communications.
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| CN201910755092.7A CN110401587A (en) | 2019-08-15 | 2019-08-15 | A kind of CAN expander and CAN network bus system |
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| CN201910755092.7A CN110401587A (en) | 2019-08-15 | 2019-08-15 | A kind of CAN expander and CAN network bus system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
| CN207965562U (en) * | 2018-01-30 | 2018-10-12 | 北京智行鸿远汽车有限公司 | CAN bus terminal resistance configuration circuit |
| CN210405348U (en) * | 2019-08-15 | 2020-04-24 | 深圳麦格米特电气股份有限公司 | CAN expander and CAN network bus system |
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2019
- 2019-08-15 CN CN201910755092.7A patent/CN110401587A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204697075U (en) * | 2015-06-24 | 2015-10-07 | 安徽江淮汽车股份有限公司 | A kind of CAN terminal resistance control device |
| 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 |
| CN207965562U (en) * | 2018-01-30 | 2018-10-12 | 北京智行鸿远汽车有限公司 | CAN bus terminal resistance configuration circuit |
| CN210405348U (en) * | 2019-08-15 | 2020-04-24 | 深圳麦格米特电气股份有限公司 | CAN expander and CAN network bus system |
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| 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 |
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