CN201107360Y - Rapid test device of CAN bus signal attribute - Google Patents
Rapid test device of CAN bus signal attribute Download PDFInfo
- Publication number
- CN201107360Y CN201107360Y CNU2007200304924U CN200720030492U CN201107360Y CN 201107360 Y CN201107360 Y CN 201107360Y CN U2007200304924 U CNU2007200304924 U CN U2007200304924U CN 200720030492 U CN200720030492 U CN 200720030492U CN 201107360 Y CN201107360 Y CN 201107360Y
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- Prior art keywords
- current
- bus
- led
- limiting resistance
- black
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- Expired - Fee Related
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- 238000012360 testing method Methods 0.000 title claims abstract description 14
- 238000009434 installation Methods 0.000 claims abstract description 5
- 239000000523 sample Substances 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 101000579646 Penaeus vannamei Penaeidin-1 Proteins 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Abstract
The utility model provides a fast testing device of a CAN bus signal attribute, the structure of the fast testing device comprises an LED, a current-limiting resistor, and a black and a red detection pens. The LED is connected with the current-limiting resistor in series, the red detection pen is connected with the current-limiting resistor in series and then connected with the anode of the LED, and the black detection pen is connected with the cathode of the LED. Compared with the prior art, the fast testing device of the CAN bus signal attribute of the utility model has the beneficial effects of simple structure, convenient use, low cost, and small volume, and can be used as a detector to be sold together with a CAN bus. When the user installs the CAN bus for using, 54 is used for detecting, so the equipment damaged by connecting by mistake with the polarity because of blindly installation without detecting when in installation can be avoided.
Description
1, technical field
The utility model relates to a kind of computer testing technology, specifically a kind of device for quick testing of CAN bus signals attribute.
2, background technology
Controller local area network CAN (Controller Area Net) is a kind of fieldbus, is mainly used in various processes and detects and control.CAN is that automobile monitoring and control designs by German BOSCH company at first, and present CAN progressively is applied in other Industry Control, has now become the ISO-11898 international standard.
The CAN bus has following characteristics:
1) CAN can be a peering structure, i.e. many host works mode, on the network any one node can be at any time on one's own initiative on network other node send information, be regardless of the principal and subordinate, communication modes is flexible.
2) node on the CAN network can be divided into different priority, satisfies different real-time needs.
3) CAN adopts the non-destructive arbitration technique, when two nodes simultaneously when network is uploaded carry information, the node that priority is low stops to send automatically, network paralysis can not occur under the very heavy situation of offered load.
4) CAN can be point-to-point, point-to-multipoint, point transmit and receive data to the mode of network, and communication distance is 10km (5kb/s) farthest, and interstitial content can reach 110.
What 5) CAN adopted is short frame structure, and the effective word joint number of each frame is 8, has CRC check and other detection method, and the data probability of makeing mistakes is little.The CAN node has automatic closing function under wrong serious situation, can not influence other nodal operation on the bus.
6) communication media adopts cheap twisted-pair feeder, no specific (special) requirements, and user interface is simple, constitutes custom system easily.
In the prior art, the netting twine that two connections of CAN bus normally are different colours is represented its attribute, but because the netting twine color distortion that different manufacturers produces is bigger, the user must search by instrumentation when installing and using, usually the equipment of usefulness is multimeter, and there is the deficiency that volume is big, inconvenience is accused and carried to cost equally in the use of multimeter.
3, utility model content
The purpose of this utility model provides a kind of device for quick testing of CAN bus signals attribute.
In the CAN bus communication agreement, adopt the logical value of dominance and stealthy two complementations to represent 0 and 1, its signal is to occur with the differential voltage form between two lines.The positive terminal that shows as the CAN bus of dominance and negative pole end all are about 2.5V with respect to the voltage between the ground; The recessive positive terminal that shows as the CAN bus exceeds about 1.5V than the voltage of negative pole end, utilizes the pressure reduction between the signal to judge positive terminal and negative pole end.
Device of the present utility model: form by LED light emitting diode, current-limiting resistance and two dark red probe pens, a light emitting diode and a current-limiting resistance polyphone, the positive pole of red probe pen string current-limiting resistance sending and receiving optical diode, the negative pole of black probe pen sending and receiving optical diode.
The beneficial effect that device of the present utility model had is, simple in structure, easy to use, with low cost, volume is little, can be used as a testing tool and CAN bus co-market, the user gets when installing and using the CAN bus in good time is used for detecting, and does not add when having avoided installation to detect blindly to install to cause polarity wrong damage equipment.
4, description of drawings
Accompanying drawing 1 is the structural representation of CAN bus signals attribute device for quick testing.
Description of reference numerals.
5, embodiment
With reference to Figure of description to explaining below the work of the present utility model.
CAN bus signals attribute device for quick testing of the present utility model, its structure is by being made up of LED light emitting diode 3, current-limiting resistance 2 and two dark red probe pens 1,5, light emitting diode 3 and current-limiting resistance 2 polyphones, the positive pole of red probe pen 4 string current-limiting resistances 2 sending and receiving optical diodes 3, the negative pole of black probe pen 1 sending and receiving optical diode 3.
For easy to use, LED light emitting diode 3 and current-limiting resistance 2 are embedded among the penholder of red probe pen 4, and another black 1 probe pen is connected with red probe pen with lead.
Embodiment:
Utilize two connections of the unidirectional conducting of electric current of LED light emitting diode and CAN bus to have the characteristic of voltage difference, the attribute of testing CAN bus signal, concrete steps are: adopt a light emitting diode and a current-limiting resistance polyphone to make proving installation, positive pole with a red probe pen series resistor sending and receiving optical diode, the negative pole of black probe pen sending and receiving optical diode, during test, use redness and black probe pen to contact two connections of CAN bus respectively, when having data to send on the CAN bus, if light emitting diode is glittering, a then red contact jaw is a positive terminal, a black contact jaw is a negative pole end, if not glittering, a then red contact jaw is a negative pole end, and a black contact jaw is a positive terminal.
Claims (2)
1. the device for quick testing of a CAN bus signals attribute, it is characterized in that forming by LED light emitting diode, current-limiting resistance and two dark red probe pens, a light emitting diode and a current-limiting resistance polyphone, the positive pole of red probe pen string current-limiting resistance sending and receiving optical diode, the negative pole of black probe pen sending and receiving optical diode.
2, proving installation according to claim 1 is characterized in that LED light emitting diode, current-limiting resistance are embedded among the penholder of redness or black probe pen, and another probe pen connects with lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200304924U CN201107360Y (en) | 2007-11-19 | 2007-11-19 | Rapid test device of CAN bus signal attribute |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200304924U CN201107360Y (en) | 2007-11-19 | 2007-11-19 | Rapid test device of CAN bus signal attribute |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201107360Y true CN201107360Y (en) | 2008-08-27 |
Family
ID=39959169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200304924U Expired - Fee Related CN201107360Y (en) | 2007-11-19 | 2007-11-19 | Rapid test device of CAN bus signal attribute |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201107360Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388822B (en) * | 2008-10-24 | 2011-05-11 | 上海华魏自动化设备有限公司 | Automatic pole changing device for CAN bus and method therefor |
| CN104835810A (en) * | 2015-02-14 | 2015-08-12 | 吴鼎鼎 | Long-life LED lamp light-emitting unit and long-life LED lamp |
| CN105891654A (en) * | 2016-03-28 | 2016-08-24 | 国网山东省电力公司章丘市供电公司 | Portable on-off tester |
-
2007
- 2007-11-19 CN CNU2007200304924U patent/CN201107360Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388822B (en) * | 2008-10-24 | 2011-05-11 | 上海华魏自动化设备有限公司 | Automatic pole changing device for CAN bus and method therefor |
| CN104835810A (en) * | 2015-02-14 | 2015-08-12 | 吴鼎鼎 | Long-life LED lamp light-emitting unit and long-life LED lamp |
| CN104835810B (en) * | 2015-02-14 | 2017-05-24 | 吴鼎鼎 | Long-life LED lamp light-emitting unit and long-life LED lamp |
| CN105891654A (en) * | 2016-03-28 | 2016-08-24 | 国网山东省电力公司章丘市供电公司 | Portable on-off tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080827 Termination date: 20101119 |