CN203027277U - CAN (Controller Area Network) bus network analyzer capable of intelligently accessing terminal resistor - Google Patents
CAN (Controller Area Network) bus network analyzer capable of intelligently accessing terminal resistor Download PDFInfo
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- CN203027277U CN203027277U CN 201320045407 CN201320045407U CN203027277U CN 203027277 U CN203027277 U CN 203027277U CN 201320045407 CN201320045407 CN 201320045407 CN 201320045407 U CN201320045407 U CN 201320045407U CN 203027277 U CN203027277 U CN 203027277U
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Abstract
The utility model relates to a CAN (Controller Area Network) bus network analyzer capable of intelligently accessing a terminal resistor, belongs to the field of network control and solves the problem that the CAN bus network analyzer of a mechanical dial switch is complicated to operate and poor in reliability. The CAN bus network analyzer comprises a singlechip microcomputer, a state display screen, a USB (Universal Serial Bus) interface circuit, an electric isolation circuit, a control unit and a CAN bus. The state display signal output end of the singlechip microcomputer is connected with the state display signal input end of the state display screen. The serial port of the singlechip microcomputer is connected with the input/output end of the USB interface circuit. A terminal resistor access and cutaway command signal output end of the singlechip microcomputer is connected with a terminal resistor access and cutaway command signal input end of the control unit through the electric isolation circuit. The control unit accesses the CAN bus. The singlechip microcomputer accesses the CAN bus through the electric isolation circuit. The control unit consists of a switch K and the terminal resistor R connected in series. The control end of the switch K is the terminal resistor access and cutaway command signal input end of the control unit.
Description
Technical field
The utility model relates to the CAN bus network analyzer of resistance of can intelligence accessing terminal, and belongs to the network control field.
Background technology
CAN(controller area network network) bus is the communication protocol of a kind of serial data, how main transmission.Communication media can use twisted-pair feeder, coaxial cable etc., and traffic rate can reach 1mbps.Because the characteristics such as its high reliability, high-performance, real-time come into one's own, be widely used in vehicle electric system and the industrial environment of circumstance complication.The CAN bus also is widely applied in China recently, but application demand can not be well satisfied in relative exploitation, debugging acid.
The developer helps analyze by CAN communication network analysis instrument the problem that the CAN bus exists usually at present.But the general external mechanical type toggle switch that has of this type of analyzer need to manually arrange its terminal resistance and whether access bus network according to the difference of application scenario, brings certain trouble to operation.Simultaneously, bring certain hidden danger also for its reliability to the reciprocal operation of toggle switch for a long time.
Summary of the invention
The utility model purpose is the problem of complicated operation, poor reliability that exists for the CAN communication network analysis instrument that solves the mechanical type toggle switch, and a kind of CAN bus network analyzer of the resistance that can intelligent access terminal is provided.
The CAN bus network analyzer of the resistance that can intelligent access terminal described in the utility model, it comprises single-chip microcomputer, state display screen, usb circuit, electrical isolation circuit, control unit and CAN bus,
The state display output of single-chip microcomputer is connected with the display input of state display screen;
The serial ports of single-chip microcomputer is connected with the input/output terminal of usb circuit;
The access of the terminal resistance of single-chip microcomputer cuts out the terminal resistance access of command signal output by electrical isolation circuit and control unit and cuts out the command signal input and be connected; Control unit access CAN bus;
Single-chip microcomputer is by electrical isolation circuit access CAN bus.
Control unit is made of K switch and terminal resistance R series connection, and the control end of K switch is that the terminal resistance access of control unit cuts out the command signal input.
K switch adopts light coupling relay to realize.
Advantage of the present utility model: the utility model provides a kind of exploitation, debugging acid of CAN bus system, has realized that intelligence, isolated controlling terminal resistance access the function of bus, help the user to analyze accurately and effectively, locate the fault that exists in bus.
In described control unit, K switch adopts light coupling relay to realize, belongs to contactless electronic beam switch, compared to mechanical switch, this scheme have be swift in motion, the life-span is long, the reliability high, but flexible Application is in various CAN bus communication systems.
The whole system that the utility model provides is simple, practical, antijamming capability is strong, and is easy to carry.
Description of drawings
Fig. 1 is the theory diagram of the CAN bus network analyzer of the resistance that can intelligent access terminal described in the utility model;
Fig. 2 is the structural representation of control unit.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 and Fig. 2, the CAN bus network analyzer of the described resistance that can intelligent access terminal of present embodiment, as shown in Figure 1, it comprises single-chip microcomputer 1, state display screen 2, usb circuit 3, electrical isolation circuit 4, control unit 5 and CAN bus 6
The state display output of single-chip microcomputer 1 is connected with the display input of state display screen 2;
The serial ports of single-chip microcomputer 1 is connected with the input/output terminal of usb circuit 3;
The access of the terminal resistance of single-chip microcomputer 1 cuts out the terminal resistance access of command signal output by electrical isolation circuit 4 and control unit 5 and cuts out the command signal input and be connected; Control unit 5 access CAN buses 6;
Single-chip microcomputer 1 is by electrical isolation circuit 4 access CAN buses 6.
As shown in Figure 2, control unit 5 is made of K switch and terminal resistance R series connection, and the control end of K switch is that the terminal resistance access of control unit 5 cuts out the command signal input.K switch and terminal resistance R consist of series circuit two ends are respectively CANH and CANL, and end points CANH and CANL are used for access CAN bus 6.
Control signal S0 by single-chip microcomputer 1 sends through after isolation processing, is used for the control terminal resistance R and whether accesses CAN bus 6.
K switch adopts light coupling relay to realize, belongs to contactless electronic beam switch, compared to mechanical switch, this scheme have be swift in motion, the life-span is long, the reliability high, but flexible Application is in various CAN bus communication systems.
Terminal resistance R selects the resistance of 110 Ω ~ 130 Ω.
Single-chip microcomputer 1 adopts 32 Cortex-M3 microcontrollers to realize.Be used for controlling, process, forward the data message on bus.
Electrical isolation circuit 4 is made of DC-DC insulating power supply module, optical relay and optocoupler three parts, and wherein the DC-DC power module is input as 5VDC, is output as 5VDC.
After the described CAN bus network of present embodiment analyzer access CAN bus network, can according to the access state that monitors the situation Lookup protocol terminal resistance of erroneous frame, realize the function of intellectual monitoring.
Claims (6)
1. can intelligence the access terminal CAN bus network analyzer of resistance is characterized in that it comprises single-chip microcomputer (1), state display screen (2), usb circuit (3), electrical isolation circuit (4), control unit (5) and CAN bus (6),
The state display output of single-chip microcomputer (1) is connected with the display input of state display screen (2);
The serial ports of single-chip microcomputer (1) is connected with the input/output terminal of usb circuit (3);
The access of the terminal resistance of single-chip microcomputer (1) cuts out the terminal resistance of command signal output by electrical isolation circuit (4) and control unit (5) and accesses and cut out the command signal input and be connected; Control unit (5) access CAN bus (6);
Single-chip microcomputer (1) is by electrical isolation circuit (4) access CAN bus (6).
2. the CAN bus network analyzer of resistance according to claim 1 can intelligence access terminal, it is characterized in that, control unit (5) is made of K switch and terminal resistance R series connection, and the control end of K switch is that the terminal resistance access of control unit (5) cuts out the command signal input.
3. according to claim 3 can intelligence the access terminal CAN bus network analyzer of resistance is characterized in that K switch adopts light coupling relay to realize.
4. according to claim 1 can intelligence the access terminal CAN bus network analyzer of resistance is characterized in that terminal resistance R selects the resistance of 110 Ω ~ 130 Ω.
5. according to claim 1 can intelligence the access terminal CAN bus network analyzer of resistance is characterized in that single-chip microcomputer (1) adopts 32 Cortex-M3 microcontrollers to realize.
6. according to claim 1 can intelligence the access terminal CAN bus network analyzer of resistance is characterized in that state display screen (2) is selected LED display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320045407 CN203027277U (en) | 2013-01-28 | 2013-01-28 | CAN (Controller Area Network) bus network analyzer capable of intelligently accessing terminal resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320045407 CN203027277U (en) | 2013-01-28 | 2013-01-28 | CAN (Controller Area Network) bus network analyzer capable of intelligently accessing terminal resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203027277U true CN203027277U (en) | 2013-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320045407 Expired - Fee Related CN203027277U (en) | 2013-01-28 | 2013-01-28 | CAN (Controller Area Network) bus network analyzer capable of intelligently accessing terminal resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203027277U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107567697A (en) * | 2015-04-30 | 2018-01-09 | 库珀技术公司 | Bus network terminator |
-
2013
- 2013-01-28 CN CN 201320045407 patent/CN203027277U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107567697A (en) * | 2015-04-30 | 2018-01-09 | 库珀技术公司 | Bus network terminator |
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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 |
Granted publication date: 20130626 Termination date: 20180128 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |