CN208110594U - Serial ports channel selection circuit and vehicular data acquisition box with it - Google Patents
Serial ports channel selection circuit and vehicular data acquisition box with it Download PDFInfo
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- CN208110594U CN208110594U CN201820141469.0U CN201820141469U CN208110594U CN 208110594 U CN208110594 U CN 208110594U CN 201820141469 U CN201820141469 U CN 201820141469U CN 208110594 U CN208110594 U CN 208110594U
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Abstract
The utility model discloses a kind of serial ports channel selection circuit and with its vehicular data acquisition box, the serial ports channel selection circuit includes：Channel selection circuit, RS232 level shifting circuit, RS485 level shifting circuit and K line circuit, the channel selection circuit carry out output channel selection to the rs 232 serial interface signal of single-chip microcontroller；The first via rs 232 serial interface signal of the channel selection circuit is carried out RS232 level signal level conversion by the RS232 level shifting circuit；Second road rs 232 serial interface signal of the channel selection circuit is carried out RS485 level signal level conversion and shown by the RS485 level shifting circuit；The third road rs 232 serial interface signal of the channel selection circuit is carried out the conversion of K line level signal by the K line circuit.Serial ports channel selection circuit provided by the embodiment of the utility model and there is its vehicular data acquisition box of tool to realize single-chip microcontroller can communicate with the RS232 serial ports of the OBDII of automobile, RS485 serial ports and K line interface respectively by a serial ports, reduce the use of single chip communication serial ports.
Description
Technical field
The utility model relates to automotive electronics bussing technique field more particularly to a kind of serial ports channel selection circuit and have
Its vehicular data acquisition box.
Background technique
Serial communication bus has a wide range of applications in electronic product, in vehicular data acquisition box, due to controller
External equipment it is relatively more so that serial port resource is relatively nervous, in existing automobile OBDII interface, common RS232 is connect
Mouth, RS485 interface and K bus interface carry out data communication.When the serial port resource deficiency of controller, single-chip microcontroller can not be selected
Data acquisition is carried out to automobile by RS232 interface, RS485 interface or K interface.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality
It is to propose a kind of serial ports channel selection circuit with a novel purpose and with its vehicular data acquisition box.
On the one hand, to achieve the above object, according to serial ports channel selection circuit provided by the embodiment of the utility model, institute
Stating serial ports channel selection circuit includes：
Channel selection circuit, the channel selection circuit carry out output channel selection to the rs 232 serial interface signal of single-chip microcontroller；
RS232 level shifting circuit, the RS232 level shifting circuit is by the first via serial ports of the channel selection circuit
Signal carries out RS232 level signal level conversion；
RS485 level shifting circuit, the RS485 level shifting circuit is by the second road serial ports of the channel selection circuit
Signal carries out RS485 level signal level conversion；
The third road rs 232 serial interface signal of the channel selection circuit is carried out K line level signal by K line circuit, the K line circuit
Conversion.
One embodiment according to the present utility model, the channel selection circuit include：
Channel to channel adapter U11 and its peripheral circuit, first passage selection circuit and second channel selection circuit；
The first passage selection circuit and second channel selection circuit are connect with the single-chip microcontroller respectively；
The first passage selection circuit and second channel selection circuit are used under the control of the single-chip microcontroller to described
The input end signal of channel to channel adapter U11 carries out the output channel selection.
One embodiment according to the present utility model, the first passage selection circuit include：Triode Q23, resistance
R101 and resistance R99；
The one end the resistance R99 is connect with first control terminal of single-chip microcontroller, the resistance R99 other end and three pole
The base stage of pipe Q23 connects, and the emitter of the triode Q23 is connect with reference, the collector and resistance of the triode Q23
One end of R101 connects, and the other end of the resistance R101 is connect with the first power supply, the collector of the triode Q23 also with institute
State the selection end A connection of channel to channel adapter U11 first passage；
The second channel selection circuit includes：Triode Q25, resistance R100 and resistance R102；
The one end the resistance R102 is connect with second control terminal of single-chip microcontroller, the resistance R102 other end and described three
The base stage of pole pipe Q25 connects, and the emitter of the triode Q25 is connect with reference, the collector and electricity of the triode Q25
Hinder one end connection of R100, the other end of the resistance R100 connect with the first power supply, the collector of the triode Q23 also with
Channel to channel adapter second channel selection end connection.
One embodiment according to the present utility model further includes hardware corridor selection circuit, the hardware corridor selection electricity
Road includes first passage selection resistance R96 and second channel resistance R95；
One end of the first passage selection pull down resistor R96 is connect with the reference, under the first passage selection
The other end of pull-up resistor R96 and channel to channel adapter U11 first passage selection terminate；
One end of the second channel selection pull down resistor R95 is connect with the reference, under the second channel selection
The other end of pull-up resistor R95 and channel to channel adapter U11 second channel selection terminate；
One embodiment according to the present utility model, the RS485 level shifting circuit include RS485 level translator
U20, serial ports terminal circuit and signal terminal circuit；
The serial ports terminal circuit includes：Triode Q24, resistance R90, resistance R88 and resistance R94；
One end of resistance R90 is connect with the output end of the second serial signal of the channel selection circuit, the resistance R90
The other end connect with the base stage of the triode Q24, the emitter of the triode Q24 with reference to connect, three pole
The collector of pipe Q24 is connect with one end of the resistance R88, and the other end of the resistance R88 is connect with the first power supply；Described three
The collector of pole pipe Q24 is also connect with one end of the resistance R94, the other end of the resistance R94 also with the RS485 level
The data of converter send enable end connection；The data receiver enable end of the RS485 level translator and data sending terminal point
It does not connect with reference；
The signal terminal circuit includes：Resistance R93, resistance R91, resistance R92 and resistance R89；
First level terminal of the RS485 level translator is connect with one end of the resistance R93 and resistance R91 respectively,
The resistance R93 other end is connect with the first power supply；The other end of the resistance R91 and first level of automobile RS485 are believed
Number end connection；
The second electrical level end of the RS485 level translator is connect with one end of the resistance R92 and resistance R89 respectively,
The resistance R92 other end is connect with reference；The other end of the resistance R89 and the automobile RS485 second electrical level signal
End connection.
One embodiment according to the present utility model, the RS485 level shifting circuit further include first terminal capacitor
C57 and second terminal capacitor C58；
One end of the first terminal capacitor C57 is connect with the first level terminal of the RS485 level translator；Second eventually
One end of end capacitor C58 is connect with the second electrical level end of the RS485 level translator；The first terminal capacitor C57 and
Two Terminal Capacitance C58 also with reference are connect respectively.
On the other hand, to achieve the above object, a kind of data acquisition box, institute are also very provided according to the utility model embodiment
Stating data acquisition box includes the serial port protocol channel selection circuit.
It is total to RS232 to control chip by channel selecting for serial ports channel selection circuit provided by the embodiment of the utility model
Line and RS485 bus carry out channel selecting, realize single-chip microcontroller by a serial ports, RS232 that can respectively with the OBDII of automobile
Serial ports, RS485 serial ports and K line are communicated, and without increasing the serial communication interface of single-chip microcontroller, reduce single chip communication string
Mouth uses.
Detailed description of the invention
Fig. 1 is serial ports channel selection circuit structural schematic diagram provided by the embodiment of the utility model；
Fig. 2 is channel to channel adapter provided by the embodiment of the utility model and its peripheral circuit structural schematic diagram；
Fig. 3 is that first passage selection circuit provided by the embodiment of the utility model and second channel selecting circuit structure are illustrated
Figure；
Fig. 4 is RS232 level shifting circuit structural schematic diagram provided by the embodiment of the utility model；
Fig. 5 is RS485 level shifting circuit structural schematic diagram provided by the embodiment of the utility model.
Appended drawing reference：
Channel selection circuit 10；
RS232 level shifting circuit 20；
RS485 level shifting circuit 30；
K line circuit 40.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
In order to make those skilled in the art better understand the scheme of the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described.Unless otherwise defined,
All technical and scientific terms used herein are generally understood with person skilled in the technical field of the present invention
Meaning it is identical.Terminology used in the description of the utility model herein is intended merely to description specific embodiment
Purpose, it is not intended that in limitation the utility model.
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
It is contained at least one embodiment of the utility model., which there is the phrase, in each position in the description to be each meant
Identical embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art are explicit
Ground and implicitly understand, embodiment described herein can be combined with other embodiments.
Refering to fig. 1, Fig. 1 is 10 structural schematic diagram of serial ports channel selection circuit provided by the embodiment of the utility model.
The utility model embodiment provides a kind of serial ports channel selection circuit 10, and the serial ports channel selection circuit 10 wraps
It includes：Channel selection circuit 10, RS232 level shifting circuit 20, RS485 level shifting circuit 30 and K line circuit 40；It is described logical
Road selection circuit 10 carries out output channel selection to the rs 232 serial interface signal of single-chip microcontroller；The RS232 level shifting circuit 20 will be described
The first via rs 232 serial interface signal of channel selection circuit 10 carries out RS232 level signal level conversion；The RS485 level conversion electricity
Second road rs 232 serial interface signal of the channel selection circuit 10 is carried out RS485 level signal level conversion by road 30；The K line electricity
The third road rs 232 serial interface signal of the channel selection circuit is carried out the conversion of K line level signal by road 40.
Specifically, the signal all the way of single-chip microcontroller is carried out the selection in channel by the channel selection circuit 10, thus realize by
The signal all the way of single-chip microcontroller carries out communication selection output.For example, by the signal behavior all the way of single-chip microcontroller input and output to one or
In the multiple RS232 level shifting circuits 20 of person or RS485 level shifting circuit 30 or K line circuit 40, such monolithic
The rs 232 serial interface signal all the way of machine, that is, be extended to multi-path choice input and output.
Serial ports channel selection circuit 10 provided by the embodiment of the utility model, it is total to RS232 by channel selection circuit 10
Line, RS485 bus and K bus carry out channel selecting, realize single-chip microcontroller by a serial ports, can respectively with the OBDII of automobile
RS232 serial bus, RS485 serial bus or K bus communicated, without increase single-chip microcontroller serial communication interface,
Single chip communication serial ports is reduced to use.
Refering to Fig. 2, Fig. 3, Fig. 2 is channel to channel adapter provided by the embodiment of the utility model and its peripheral circuit structural representation
Figure；Fig. 3 is first passage selection circuit provided by the embodiment of the utility model and second channel selecting circuit structure schematic diagram.
Further, in one embodiment of the utility model, the channel selection circuit includes：Channel to channel adapter
U11 and its peripheral circuit, first passage selection circuit 10 and second channel selection circuit 10；The first passage selection circuit 10
It is connect respectively with the single-chip microcontroller with second channel selection circuit 10；The first passage selection circuit 10 and second channel selection
Circuit 10 is for carrying out the output channel to the input end signal of the channel to channel adapter U11 under the control of the single-chip microcontroller
Selection.For example, the rs 232 serial interface signal of the single-chip microcontroller is chosen RS232 level shifting circuit under the control of the single-chip microcontroller
20, in RS485 level shifting circuit 30 or K line circuit 40 it is any all the way in output.
Further, in one embodiment of the utility model, the first passage selection circuit 10 includes：Triode
Q23, resistance R101 and resistance R99；The one end the resistance R99 is connect with the first control terminal of single-chip microcontroller RS232_UEN, described
The resistance R99 other end is connect with the base stage of the triode Q23, and the emitter of the triode Q23 is connect with reference, described
The collector of triode Q23 is connect with one end of resistance R101, and the other end of the resistance R101 and the first power supply VCC_5V connect
It connects, the collector of the triode Q23 is also connect with channel to channel adapter U11 first passage selection end A.In the utility model
In embodiment, the triode Q23 is NPN triode.
The second channel selection circuit 10 includes：Triode Q25, resistance R100 and resistance R102；The resistance R102
One end is connect with the second control terminal of single-chip microcontroller RS485_UEN, and the resistance R102 other end is with the triode Q25's
The emitter of base stage connection, the triode Q25 is connect with reference, and the collector of the triode Q25 is with resistance R100's
One end connection, the other end of the resistance R100 connect with the first power supply VCC_5V, the collector of the triode Q23 also with institute
State the selection end B connection of channel to channel adapter U11 second channel.In the utility model embodiment, the triode Q25 is NPN
Triode.
Specifically, with continued reference to Fig. 3；When the channel to channel adapter U11 first passage selects end A and the channel selecting
When device U11 second channel selects end B simultaneously for low level, the microcontroller serial port signal and third road rs 232 serial interface signal connect
Logical, the microcontroller serial port is signally attached to K line circuit, realizes the communication with single-chip microcontroller and K bus；When the channel to channel adapter
U11 first passage selects end A for high level, when the channel to channel adapter U11 second channel selects end B as low level, the list
Piece machine rs 232 serial interface signal is connected to the first via rs 232 serial interface signal, and the microcontroller serial port is signally attached to RS232 level conversion electricity
Road 20.Realize the communication with single-chip microcontroller and RS323 bus；When the channel to channel adapter U11 first passage selects end A for low electricity
It is flat, when the channel to channel adapter U11 second channel select end B as high level, the microcontroller serial port signal and second tunnel
Rs 232 serial interface signal connection, the microcontroller serial port are signally attached to RS485 level shifting circuit 20.It realizes and single-chip microcontroller and RS485
The communication of bus.
Further, in one embodiment of the utility model, hardware corridor selection circuit, the hardware corridor choosing are gone back
Select circuit first passage selection resistance R96 and second channel resistance R95；One end of the first passage selection resistance R96 and institute
It states and connects with referring to, the other end and the channel to channel adapter U11 first passage of the first passage selection resistance R96 selects end
A connects；One end of the second channel selection resistance R95 is connect with the reference, and the second channel selection resistance R95's is another
One end connects with channel to channel adapter U11 second channel selection end B.
Specifically, not having by selecting resistance R96 and second channel resistance R95 to the first passage in the single-chip microcontroller
When having output control level signal, so that the channel to channel adapter U11 default choice exports rs 232 serial interface signal to the K line circuit.
Refering to Fig. 4, Fig. 4 is RS232 level shifting circuit structural schematic diagram provided by the embodiment of the utility model.
Further, in one embodiment of the utility model, the RS232 level shifting circuit 20 includes RS232
Level translator U19 and its peripheral circuit；The first input/output terminal of the RS232 level translator U19 and the channel selecting
The output end of the first serial signal of circuit 10 connects；The second input/output terminal of the RS232 level translator U19 and automobile
The connection of RS232 level signal end.
Refering to Fig. 5, Fig. 5 is 30 structural schematic diagram of RS485 level shifting circuit provided by the embodiment of the utility model.
Further, in one embodiment of the utility model, the RS485 level shifting circuit 30 includes RS485
Level translator U20, serial ports terminal circuit and signal terminal circuit.
The serial ports terminal circuit includes：Triode Q24, resistance R90, resistance R88 and resistance R94；One end of resistance R90 with
The output end of the second serial signal of the channel selection circuit 10 connects, the other end and the triode of the resistance R90
The base stage of Q24 connects, and the emitter of the triode Q24 is connect with reference, the collector and the electricity of the triode Q24
One end connection of R88 is hindered, the other end of the resistance R88 is connect with the first power supply VCC_5V；The current collection of the triode Q24
Pole is also connect with one end of the resistance R94, data of the other end of the resistance R94 also with the RS485 level translator
Send enable end DE connection；Data receiver enable end/the RE and data sending terminal DI of the RS485 level translator respectively with ginseng
It connects with examining.In the utility model embodiment, the triode Q23 is NPN triode.
The signal terminal circuit includes：Resistance R93, resistance R91, resistance R92 and resistance R89；The RS485 level turns
First level terminal A of parallel operation is connect with one end of one end of the resistance R93 and resistance R91 respectively, the resistance R93 other end
It is connect with the first power supply VCC_5V；The other end of the resistance R91 and the first level signal of automobile RS485 end PIO12 connect
It connects.
The second electrical level end B of the RS485 level translator respectively with one end of the resistance R92 and resistance R89 one
End connection, the resistance R92 other end are connect with reference；The second electricity of the other end of the resistance R89 and the automobile RS485
Flat signal end PIO13 connection.
More specifically, with continued reference to Fig. 5, due to the data receiver enable end/RE and ginseng of the RS485 level translator
It connects with examining, so that the RS485 level translator data receiver enable end is effective, automobile OBDII interface data directly passes through
The channel selection circuit is transmitted to the serial communication interface of single-chip microcontroller.
The single-chip microcontroller sends data by the channel selection circuit, described when the transmission data are low level
It is off state between the emitter and base stage of triode Q24, the data of the RS485 level translator send enable end DE and are
It is effective to send signal for high level.Due at this point, the RS485 level translator data sending terminal DI with reference to connect, institute
The corresponding differential signal of RS485 level translator output low level signal is stated to the automobile OBDII interface.When the transmission number
It is on state between the emitter and base stage of the triode Q24 when according to for high level, the RS485 level translator
It is low level that data, which send enable end DE, sends invalidating signal.Due at this point, the RS485 level translator the first level
End A is connect by resistance R93 with the first power supply VCC_5V, and the second electrical level end B of the RS485 level translator passes through resistance
R92 is connect with reference, and the RS485 level translator exports the corresponding differential signal of high level signal to the automobile
OBDII interface.
The utility model embodiment by by RS485 level translator and the serial ports terminal circuit and signal terminal circuit,
It is only communicated by two signal wires with single-chip microcontroller, realizes automatic reception data, reduce the use of single-chip microcontroller IO control pin,
Increase the stability and the received real-time of signal of circuit.
Further, in one embodiment of the utility model, the RS485 level shifting circuit 30 further includes
One Terminal Capacitance C57 and second terminal capacitor C58；One end of the first terminal capacitor C57 and the RS485 level translator
The first level terminal A connection；The second electrical level end B of one end of second terminal capacitor C58 and the RS485 level translator connects
It connects；The first terminal capacitor C57 and second terminal capacitor C58 also with reference are connect respectively.
Specifically, first terminal capacitor C57 and second terminal capacitor C58 filter out some high frequency waves in bus.Avoid height
Frequency signal is to the level of the first level terminal of the RS485 level translator or the second electrical level end of RS485 level translator
It influences.Further, when automobile is struck sparks, surging signal, the first terminal capacitor are likely to occur on the OBDII interface
C57 and second terminal capacitor C58 further filter out the surge, avoid the surging signal to the RS485 level conversion
The damage of the first level terminal A or second electrical level end B of device.
Preferably, the RS485 level translator U20 is integrated using uMAX485 in the utility model embodiment
Circuit.
The utility model embodiment additionally provides a kind of data acquisition box, and the data acquisition box includes that above-described embodiment mentions
The serial ports channel selection circuit 10 of confession.
Data acquisition box provided by the embodiment of the utility model has the serial ports channel selecting electricity as described in above-described embodiment
Road, the serial ports channel selection circuit control chip by channel selecting and carry out channel selecting to RS232 bus and RS485 bus,
Single-chip microcontroller is realized by a serial ports, can respectively with the RS232 serial ports of the OBDII of automobile, RS485 serial ports and K bus into
Row communication, without increasing the serial communication interface of single-chip microcontroller.By the way that the data receiver enable end of RS485 level translator is joined
It connects with examining, to realize automatic reception data, reduces the use of single-chip microcontroller IO control pin, increase the stability of circuit, with
And the received real-time of signal.
The above is only the embodiments of the present invention, are not intended to limit the scope of the patents of the utility model, although referring to before
Embodiment is stated the utility model is described in detail, it, still can be right for coming for those skilled in the art
Technical solution documented by aforementioned each specific embodiment is modified, or carries out equivalent replace to part of technical characteristic
It changes.All equivalent structures done using the utility model specification and accompanying drawing content are directly or indirectly used in other correlations
Technical field, similarly within the utility model patent protection scope.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Stating may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are not departing from the utility model
Principle and objective in the case where above-described embodiment can be changed in the scope of the utility model, modify, replace and
Modification.
Claims (7)
1. a kind of serial ports channel selection circuit, which is characterized in that the serial ports channel selection circuit includes：
Channel selection circuit, the channel selection circuit carry out output channel selection to the rs 232 serial interface signal of single-chip microcontroller；
RS232 level shifting circuit, the RS232 level shifting circuit is by the first via rs 232 serial interface signal of the channel selection circuit
Carry out RS232 level signal level conversion；
RS485 level shifting circuit, the RS485 level shifting circuit is by the second road rs 232 serial interface signal of the channel selection circuit
Carry out RS485 level signal level conversion；
The third road rs 232 serial interface signal of the channel selection circuit is carried out K line level signal and converted by K line circuit, the K line circuit.
2. serial ports channel selection circuit according to claim 1, which is characterized in that the channel selection circuit includes：
Channel to channel adapter U11 and its peripheral circuit, first passage selection circuit and second channel selection circuit；
The first passage selection circuit and second channel selection circuit are connect with the single-chip microcontroller respectively；
The first passage selection circuit and second channel selection circuit are used under the control of the single-chip microcontroller to the channel
The input end signal of selector U11 carries out the output channel selection.
3. serial ports channel selection circuit according to claim 2, which is characterized in that the first passage selection circuit packet
It includes：Triode Q23, resistance R101 and resistance R99；The one end the resistance R99 is connect with first control terminal of single-chip microcontroller, described
The resistance R99 other end is connect with the base stage of the triode Q23, and the emitter of the triode Q23 is connect with reference, described
The collector of triode Q23 is connect with one end of resistance R101, and the other end of the resistance R101 is connect with the first power supply, described
The collector of triode Q23 is also connect with channel to channel adapter U11 first passage selection end；
The second channel selection circuit includes：Triode Q25, resistance R100 and resistance R102；The one end the resistance R102 with
The second control terminal of single-chip microcontroller connection, the resistance R102 other end are connect with the base stage of the triode Q25, three pole
The emitter of pipe Q25 is connect with reference, and the collector of the triode Q25 is connect with one end of resistance R100, the resistance
The other end of R100 is connect with the first power supply, and the collector of the triode Q23 is also selected with the channel to channel adapter second channel
Select end connection.
4. serial ports channel selection circuit according to claim 3, which is characterized in that it further include hardware corridor selection circuit,
The hardware corridor selection circuit includes first passage selection resistance R96 and second channel resistance R95；
One end of the first passage selection pull down resistor R96 is connect with the reference, the first passage selection drop-down electricity
The other end and channel to channel adapter U11 first passage selection for hindering R96 terminate；
One end of the second channel selection pull down resistor R95 is connect with the reference, the second channel selection drop-down electricity
The other end and the channel to channel adapter U11 second channel for hindering R95 select end.
5. serial ports channel selection circuit according to claim 1, which is characterized in that the RS485 level shifting circuit packet
Include RS485 level translator U20, serial ports terminal circuit and signal terminal circuit；
The serial ports terminal circuit includes：Triode Q24, resistance R90, resistance R88 and resistance R94；One end of resistance R90 with it is described
The output end of the second serial signal of channel selection circuit connects, the base of the other end of the resistance R90 and the triode Q24
The emitter of pole connection, the triode Q24 is connect with reference, and the collector of the triode Q24 is with the resistance R88's
One end connection, the other end of the resistance R88 are connect with the first power supply；The collector of the triode Q24 also with the resistance
One end of R94 connects, and the other end of the resistance R94 also sends enable end with the data of the RS485 level translator and connect；
The data receiver enable end of the RS485 level translator and data sending terminal with reference are connect respectively；
The signal terminal circuit includes：Resistance R93, resistance R91, resistance R92 and resistance R89；The RS485 level translator
First level terminal is connect with one end of one end of the resistance R93 and resistance R91 respectively, the resistance R93 other end and first
Power supply connection；The other end of the resistance R91 is connect with first level signal of automobile RS485 end；
The second electrical level end of the RS485 level translator connects with one end of the resistance R92 and one end of resistance R89 respectively
It connects, the resistance R92 other end is connect with reference；The other end of the resistance R89 and the automobile RS485 second electrical level are believed
Number end connection.
6. serial ports channel selection circuit according to claim 1, which is characterized in that the RS485 level shifting circuit is also
Including first terminal capacitor C57 and second terminal capacitor C58；One end of the first terminal capacitor C57 and RS485 electricity
First level terminal of flat turn parallel operation connects；The second electrical level of one end of second terminal capacitor C58 and the RS485 level translator
End connection；The first terminal capacitor C57 and second terminal capacitor C58 also with reference are connect respectively.
7. a kind of data acquisition box, which is characterized in that the data acquisition box includes that claim 1 is any as claim 6
Serial ports channel selection circuit described in one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820141469.0U CN208110594U (en) | 2018-01-25 | 2018-01-25 | Serial ports channel selection circuit and vehicular data acquisition box with it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820141469.0U CN208110594U (en) | 2018-01-25 | 2018-01-25 | Serial ports channel selection circuit and vehicular data acquisition box with it |
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| Publication Number | Publication Date |
|---|---|
| CN208110594U true CN208110594U (en) | 2018-11-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108182166A (en) * | 2018-01-25 | 2018-06-19 | 深圳市朗仁科技有限公司 | Serial ports channel selection circuit and with its vehicular data acquisition box |
| CN111884654A (en) * | 2020-07-08 | 2020-11-03 | 中山市金马科技娱乐设备股份有限公司 | Digital factory data acquisition terminal |
-
2018
- 2018-01-25 CN CN201820141469.0U patent/CN208110594U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108182166A (en) * | 2018-01-25 | 2018-06-19 | 深圳市朗仁科技有限公司 | Serial ports channel selection circuit and with its vehicular data acquisition box |
| CN111884654A (en) * | 2020-07-08 | 2020-11-03 | 中山市金马科技娱乐设备股份有限公司 | Digital factory data acquisition terminal |
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