CN207234820U - A kind of protocol conversion circuitry and device - Google Patents
A kind of protocol conversion circuitry and device Download PDFInfo
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- CN207234820U CN207234820U CN201721101465.1U CN201721101465U CN207234820U CN 207234820 U CN207234820 U CN 207234820U CN 201721101465 U CN201721101465 U CN 201721101465U CN 207234820 U CN207234820 U CN 207234820U
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Abstract
The utility model belongs to vehicle-mounted control technical field, there is provided a kind of protocol conversion circuitry, it includes control chip, OBD interfaces, K line signal transmitting and receivings module, CAN signal transceiver module, RS485 signal transmitting and receivings module, L line signal transmitting and receiving modules and power module；The K lines signal transmitting and receiving module, the CAN signal transceiver module, the L lines signal transmitting and receiving module and the RS485 signal transmitting and receivings module are both connected between the control chip and the OBD interfaces；The power module is connected with the OBD interfaces, receives the DC voltage of the OBD interfaces output, and provides power supply for the K lines signal transmitting and receiving module, CAN signal transceiver module and RS485 signal transmitting and receiving modules.The communication protocol of the OBD system of compatible various types of vehicles, reduces the development difficulty and development cost of external diagnostic equipment.
Description
Technical field
The utility model belongs to vehicle-mounted control technical field, more particularly to a kind of protocol conversion circuitry and device.
Background technology
At present, the promotion with the automobile correlation method of various countries with the development of automotive electronic technology, the automobile produced both at home and abroad
Generally it is equipped with OBD (On-Board Diagnostic, onboard diagnostic system) system.The system is equipped with special communication interface,
External equipment is facilitated to read the fault message or the work shape of test related system and parts of vehicle registration by this interface
State.
OBD system gradually moves towards standardization, but due to historical reasons, different brands, different types of vehicle
OBD system still cannot reach unified, especially on communication mode, each not phase of the logical information protocol of the OBD system of different automobile types
Together, each other cannot be compatible, more of external diagnostic equipment causes external diagnostic equipment development cost to diagnose single automobile development
Increase, and add the complexity of external diagnostic equipment.
Utility model content
The purpose of this utility model is to provide a kind of protocol conversion circuitry and device, it is intended to solves traditional technical solution
Present in external diagnostic equipment and OBD system communication protocol it is incompatible the problem of.
A kind of protocol conversion circuitry, the circuit include control chip, OBD interfaces, K line signal transmitting and receivings module, CAN signal
Transceiver module, RS485 signal transmitting and receivings module, L line signal transmitting and receiving modules and power module；It is the K lines signal transmitting and receiving module, described
CAN signal transceiver module, L line signal transmitting and receiving modules and the RS485 signal transmitting and receivings module be both connected to the control chip and
Between the OBD interfaces；The power module is connected with the OBD interfaces, receives the DC voltage of the OBD interfaces output,
And provide power supply for the K lines signal transmitting and receiving module, CAN signal transceiver module and RS485 signal transmitting and receiving modules.
Further, the K lines signal transmitting and receiving module includes K line signal transmitting and receiving chips, and the K lines signal transmitting and receiving chip connects
Spasm foot and transmission pin are connected with the control chip, K lines signal pins and the OBD of the K lines signal transmitting and receiving chip
Interface connects.
Further, stating CAN signal transceiver module includes CAN signal transceiving chip, the TXD1 of the CAN signal transceiving chip
Pin, the RXD1 pins of CAN signal transceiving chip, the TXD2 pins of the CAN signal transceiving chip, CAN signal transmitting-receiving
The RXD2 pins of chip are connected with the control chip, and the CANL2 pins of the CAN signal transceiving chip, the CAN signal are received
Send out CANH2 pins, the CANL1 pins of the CAN signal transceiving chip and the CANH1 of the CAN signal transceiving chip of chip
Pin is connected with the OBD interfaces, the GNDA pins of the CAN signal transceiving chip and the CAN signal transceiving chip
GNDB pins are grounded, and the VCC pin of the CAN signal transceiving chip connects the DC power supply of the power module output.
Further, the RS485 signal transmitting and receivings module includes RS485 interface chips, first resistor, second resistance, the 3rd
Resistance, the first diode and the first capacitance, the RO pins of the RS485 interface chips, the RE of the RS485 interface chips draw
The DI pins of foot, the DE pins of the RS485 interface chips and the RS485 interface chips are connected with the control chip, its
In, the DI pins of the RO pins of the RS485 interface chips and the RS485 interface chips are respectively the RS485 interfaces core
The signal of piece sends and receives pin, the B pins and institute of the A pins of the RS485 interface chips and the RS485 interface chips
The connection of OBD interfaces is stated, the RE pins of the RS485 interface chips connect the straight of the power module output by the first resistor
Galvanic electricity source, the DI pins of the RS485 interface chips connect the DC power supply of the power module output by the second resistance,
The DE pins of the RS485 interface chips are grounded by the 3rd resistor, the GND pin ground connection of the RS485 interface chips,
The VCC pin of the RS485 interface chips is power pins, and the VCC pin of the RS485 interface chips passes through the diode
The DC power supply of the D2 connections power module output, the VCC pin of the RS485 interface chips are connect by first capacitance
Ground.
Further, the L lines signal transmitting and receiving module includes the first triode, the 4th resistance, the 5th resistance and the 6th resistance,
The base stage of first triode connects control chip, one end connection described the of the 5th resistance by the 4th resistance
The base stage of one triode, the other end ground connection of the 5th resistance, the collector of first triode pass through the described 6th electricity
Resistance connects the 12V DC voltage of the OBD interfaces output, and the collector of first triode is connected with the OBD interfaces,
The emitter ground connection of first triode.
Further, the power module includes the 7th resistance, the second triode, the second capacitance and a power switch, described
The input terminal of power switch connects the OBD interfaces, the output terminal of the power switch respectively with the K lines signal transmitting and receiving mould
Block, CAN signal transceiver module, the connection of RS485 signal transmitting and receivings module, the control terminal of the power switch connect the two or three pole
The collector of pipe, the 7th resistance are connected between the input terminal of the power switch and the control terminal of the power switch,
The base stage of second triode connects the control chip, the emitter ground connection of second triode, second capacitance
It is connected between the power switch output terminal and ground.
Further, the control chip is STM32F105RBT6 chips.
In addition, a kind of protocol conversion apparatus is additionally provided, including the protocol conversion circuitry that right is above-mentioned.
Above-mentioned protocol conversion circuitry, control chip control K line signal transmitting and receivings module, CAN signal transceiver module, RS485
Signal transmitting and receiving module and L line signal transmitting and receiving modules connect the diagnosis interface of vehicle by OBD interfaces, can receive K lines signal,
CAN signal, RS485 signals and L line signals, the communication protocol of the OBD system of compatible various types of vehicles, reduce external diagnosis
The development difficulty and development cost of equipment.
Brief description of the drawings
Fig. 1 is the protocol conversion circuitry structure diagram that the utility model preferred embodiment provides；
Fig. 2 be Fig. 1 shown in protocol conversion circuitry in control chip exemplary circuit schematic diagram；
Fig. 3 be Fig. 1 shown in protocol conversion circuitry in K line signal transmitting and receiving modules exemplary circuit schematic diagram；
Fig. 4 be Fig. 1 shown in protocol conversion circuitry in CAN signal transceiver module exemplary circuit schematic diagram；
Fig. 5 be Fig. 1 shown in protocol conversion circuitry in RS485 signal transmitting and receiving modules exemplary circuit schematic diagram；
Fig. 6 be Fig. 1 shown in protocol conversion circuitry in L line signal transmitting and receiving modules exemplary circuit schematic diagram；
Fig. 7 be Fig. 1 shown in protocol conversion circuitry in power module exemplary circuit schematic diagram.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining
The utility model, is not used to limit the utility model.
Fig. 1 shows the structure diagram for the protocol conversion circuitry that the utility model preferred embodiment provides, for the ease of
Illustrate, illustrate only part related to the present embodiment, details are as follows：
A kind of protocol converter, including the transmitting-receiving of control chip 10, OBD interfaces 20, K line signal transmitting and receivings module 30, CAN signal
Module 40, RS485 signal transmitting and receivings module 50, L line signal transmitting and receivings module 60 and power module 70.
OBD interfaces 20 are II connector of EOBD connectors or OBD of standard, OBD interfaces 20 and the diagnosis interface on vehicle
Docking, and pass through the fault message of diagnosis interface reading vehicle.Control chip 10 respectively with K line signal transmitting and receivings module 30, CAN
Signal transmitting and receiving module 40 and RS485 transceiver modules 50 connect, for K lines signal, CAN bus signal and RS485 bus signals
Conversion and transmission simultaneously communicate with host computer.In the present embodiment, which is STM32F105RBT6 chips.
K line signal transmitting and receivings module 30 includes K lines transceiving chip 31, and in the present embodiment, which is preferably
L9637D chips, are 8 leaded packages, the 4th pin of the first pin RX and K line transceiving chip 31 of K lines transceiving chip 31
TX is connected with control chip 10, reception pin and transmission pin as K lines transceiving chip 31；The 3rd of K lines transceiving chip 31
Pin VCC be K lines transceiving chip 31 power pins, external 5V DC power supplies；5th pin GND of K lines transceiving chip 31 connects
Ground, the 6th pin K connection OBD interfaces 20 of K lines transceiving chip 31.
CAN signal transceiver module 40 includes CAN signal transceiving chip 41, in the present embodiment, CAN signal transceiving chip 41
Using TJA1048 chips, which is two-way CAN signal transmitting and receiving chip 41, has two-way CAN signal transmitting-receiving circuit, wherein,
First pin TXD1 of CAN signal transceiving chip 41, the 4th pin RXD1 of CAN signal transceiving chip 41, CAN signal transmitting-receiving core
The 6th pin TXD2, the 7th pin RXD2 of CAN signal transceiving chip 41 of piece 41 are connected with control chip 10, and CAN signal is received
Send out the 9th pin CANL2 of chip 41, the tenth pin CANH2 of CAN signal transceiving chip 41, CAN signal transceiving chip 41
13rd pin CANH1 of the 12nd pin CANL1 and CAN signal transceiving chip 41 is connected with OBD interfaces 20, and CAN signal is received
Send out the first pin TXD1 of chip 41, the 4th pin RXD1 of CAN signal transceiving chip 41, the of CAN signal transceiving chip 41
13rd pin CANH1 of 12 pin CANL1 and CAN signal transceiving chip 41 is correspondingly formed CAN signal transmitting-receiving circuit all the way,
6th pin TXD2 of CAN signal transceiving chip 41, the 7th pin RXD2 of CAN signal transceiving chip 41, CAN signal transmitting-receiving core
9th pin CANL2 of piece 41 and the tenth pin CANH2 of CAN signal transceiving chip 41 is correspondingly formed another way CAN signal receipts
Hair line road, two-way CAN signal transmitting-receiving circuit is high-speed line all the way, and another way is low speed line.CAN signal transceiving chip 41
Second pin GNDA and the 5th pin GNDB of CAN signal transceiving chip 41 be grounding pin, CAN signal transceiving chip 41
5th pin GNDB of second pin GNDA and CAN signal transceiving chip 41 is grounded, the 3rd pin of CAN signal transceiving chip 41
VCC connects the 5V DC power supplies of the output of power module 70.
RS485 signal transmitting and receivings module 50 includes RS485 interface chips 51, resistance R2, resistance R10, resistance R13, diode
Second pin RE, the RS485 interface of first pin RO, RS485 interface chip 51 of Q3 and capacitance C10, RS485 interface chip 51
4th pin DI of the 3rd pin DE and RS485 interface chip 51 of chip 51 is connected with control chip 10, wherein, RS485 connects
4th pin DI of the first pin RO and RS485 interface chip 51 of mouth chip 51 is respectively the signal of RS485 interface chips 51
Pin is sent and received, the 7th pin B and OBD of the 6th pin A and RS485 interface chip 51 of RS485 interface chips 51 connects
Mouth 20 connects, and the diagnosis interface communication with vehicle, the second pin RE of RS485 interface chips 51 connects power module by resistance R2
The 5V DC power supplies of 70 outputs, the 4th pin DI of RS485 interface chips 51 meet the 5V of the output of power module 70 by resistance R10
DC power supply, the 3rd pin DE of RS485 interface chips 51 are grounded by resistance R13, the 5th pin of RS485 interface chips 51
GND is grounded, and the 8th pin VCC of RS485 interface chips 51 is power pins, and the 8th pin VCC of RS485 interface chips 51 leads to
Diode D2 connection 5V DC power supplies are crossed, the 8th pin VCC of RS485 interface chips 51 is grounded by capacitance C10.
L line signal transmitting and receivings module 60 includes triode Q3, resistance R12, resistance R14 and resistance R5, the base stage of triode Q3
Pass through resistance R12 connections control chip 10, the base stage of one end connecting triode Q3 of resistance R14, another termination of resistance R14
Ground, the 12V DC voltage that the collector of triode Q3 is exported by resistance R5 connection OBD interfaces 20, and the current collection of triode Q3
Pole is connected with OBD interfaces 20, the emitter ground connection of triode Q3.
Power module 70 respectively with control chip 10, K line signal transmitting and receivings module 30, CAN signal transceiver module 40, RS485
Transceiver module 50 connects, and power module 70 includes resistance R4, triode Q2, capacitance C9 and power switch Q1, power switch
Input terminal connection OBD interfaces 20, the output terminal of power switch Q1 respectively with K line signal transmitting and receivings module 30, CAN signal transceiver module
40th, RS485 signal transmitting and receivings module 50 connects, the collector of the control terminal connecting triode Q2 of power switch Q1, resistance R4 connections
Between the input terminal of power switch Q1 and power switch Q1 control terminals, the base stage connection control chip 10 of triode Q2, three poles
The emitter ground connection of pipe Q2, capacitance C9 are connected between power switch Q1 output terminals and ground.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of protocol conversion circuitry, it is characterised in that the circuit includes：Control chip, OBD interfaces, K line signal transmitting and receiving moulds
Block, CAN signal transceiver module, RS485 signal transmitting and receivings module, L line signal transmitting and receiving modules and power module；The K lines signal is received
Hair module, the CAN signal transceiver module, the L lines signal transmitting and receiving module and the RS485 signal transmitting and receivings module are both connected to
Between the control chip and the OBD interfaces；The power module is connected with the OBD interfaces, and it is defeated to receive the OBD interfaces
The DC voltage gone out, and be the K lines signal transmitting and receiving module, the CAN signal transceiver module and the RS485 signal transmitting and receivings mould
Block provides power supply.
2. protocol conversion circuitry as claimed in claim 1, it is characterised in that the K lines signal transmitting and receiving module includes K line signals
Transceiving chip, the reception pin and transmission pin of the K lines signal transmitting and receiving chip are connected with the control chip, the K lines letter
The K lines signal pins of number transceiving chip are connected with the OBD interfaces.
3. protocol conversion circuitry as claimed in claim 1, it is characterised in that the CAN signal transceiver module includes CAN signal
Transceiving chip, the TXD1 pins of the CAN signal transceiving chip, the RXD1 pins of CAN signal transceiving chip, the CAN signal
The TXD2 pins of transceiving chip, the RXD2 pins of the CAN signal transceiving chip are connected with the control chip, the CAN letters
Number CANL2 pins of transceiving chip, the CANH2 pins of the CAN signal transceiving chip, the CAN signal transceiving chip
The CANH1 pins of CANL1 pins and the CAN signal transceiving chip are connected with the OBD interfaces, and the CAN signal receives and dispatches core
The GNDB pins of the GNDA pins of piece and the CAN signal transceiving chip are grounded, the VCC pin of the CAN signal transceiving chip
Connect the DC power supply of the power module output.
4. protocol conversion circuitry as claimed in claim 1, it is characterised in that the RS485 signal transmitting and receivings module includes RS485
Interface chip, first resistor, second resistance, 3rd resistor, the first diode and the first capacitance, the RS485 interface chips
RO pins, the RE pins of the RS485 interface chips, the DE pins of the RS485 interface chips and the RS485 interface chips
DI pins be connected with the control chip, wherein, the RO pins of the RS485 interface chips and the RS485 interface chips
DI pins be respectively that the signals of the RS485 interface chips sends and receives pin, the A pins of the RS485 interface chips
It is connected with the B pins of the RS485 interface chips with the OBD interfaces, the RE pins of the RS485 interface chips pass through described
First resistor connects the DC power supply of the power module output, and the DI pins of the RS485 interface chips pass through the described second electricity
Resistance connects the DC power supply of the power module output, and the DE pins of the RS485 interface chips are grounded by the 3rd resistor,
The GND pin ground connection of the RS485 interface chips, the VCC pins of the RS485 interface chips are power pins, the RS485
The DC power supply that the VCC pin of interface chip is exported by the diode D2 connections power module, the RS485 interfaces
The VCC pin of chip passes through first capacity earth.
5. protocol conversion circuitry as claimed in claim 1, it is characterised in that the L lines signal transmitting and receiving module includes the one or three
Pole pipe, the 4th resistance, the 5th resistance and the 6th resistance, the base stage of first triode is connected by the 4th resistance to be controlled
Chip, one end of the 5th resistance connect the base stage of first triode, and the other end ground connection of the 5th resistance is described
The collector of first triode connects the 12V DC voltage of the OBD interfaces output, and described first by the 6th resistance
The collector of triode is connected with the OBD interfaces, the emitter ground connection of first triode.
6. protocol conversion circuitry as claimed in claim 1, it is characterised in that the power module includes the 7th resistance, second
Triode, the second capacitance and a power switch, the input terminal of the power switch connect the OBD interfaces, the power switch
Output terminal be connected respectively with the K lines signal transmitting and receiving module, CAN signal transceiver module, RS485 signal transmitting and receiving modules, it is described
The control terminal of power switch connects the collector of second triode, and the 7th resistance is connected to the defeated of the power switch
Enter between end and the control terminal of the power switch, the base stage connection control chip of second triode, described second
The emitter ground connection of triode, second capacitance connection is between the power switch output terminal and ground.
7. protocol conversion circuitry as claimed in claim 1, it is characterised in that the control chip is STM32F105RBT6 cores
Piece.
8. a kind of protocol conversion apparatus, it is characterised in that including the protocol conversion circuitry described in claim 1 to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721101465.1U CN207234820U (en) | 2017-08-30 | 2017-08-30 | A kind of protocol conversion circuitry and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721101465.1U CN207234820U (en) | 2017-08-30 | 2017-08-30 | A kind of protocol conversion circuitry and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207234820U true CN207234820U (en) | 2018-04-13 |
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ID=61859747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721101465.1U Active CN207234820U (en) | 2017-08-30 | 2017-08-30 | A kind of protocol conversion circuitry and device |
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| Country | Link |
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| CN (1) | CN207234820U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108924170A (en) * | 2018-09-21 | 2018-11-30 | 深圳市领世达科技有限公司 | Vehicle data conversion equipment |
| CN110347091A (en) * | 2019-08-01 | 2019-10-18 | 博康姆(深圳)云科技有限公司 | Mark peripheral equipment management device and its management method in portion |
-
2017
- 2017-08-30 CN CN201721101465.1U patent/CN207234820U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108924170A (en) * | 2018-09-21 | 2018-11-30 | 深圳市领世达科技有限公司 | Vehicle data conversion equipment |
| CN108924170B (en) * | 2018-09-21 | 2024-04-23 | 深圳市领世达科技有限公司 | Vehicle data conversion device |
| CN110347091A (en) * | 2019-08-01 | 2019-10-18 | 博康姆(深圳)云科技有限公司 | Mark peripheral equipment management device and its management method in portion |
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