CN216449904U - Communication protocol loop switching circuit - Google Patents
Communication protocol loop switching circuit Download PDFInfo
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- CN216449904U CN216449904U CN202121680695.4U CN202121680695U CN216449904U CN 216449904 U CN216449904 U CN 216449904U CN 202121680695 U CN202121680695 U CN 202121680695U CN 216449904 U CN216449904 U CN 216449904U
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Abstract
The utility model discloses a communication protocol loop switching circuit, which comprises a first communication circuit, a second communication circuit and a communication signal selection control circuit, wherein a signal input and output by a first communication interface is subjected to first communication protocol signal conversion through the first communication circuit; the second communication circuit carries out second communication protocol signal conversion on the signal input and output by the second communication interface; in this way two different communication peripherals can be connected via the first communication circuit and the second communication circuit. And then the controller is used for selectively inputting and outputting the output signals of the first communication circuit or the second communication circuit, so that one external communication interface can realize the selection of two communication protocols of the single chip microcomputer controller for external output, the use of the interfaces is reduced, and the volume of the test circuit board is reduced.
Description
Technical Field
The utility model relates to the technical field of circuit board testing, in particular to a communication protocol loop switching circuit.
Background
In testing intelligent hardware, the test result of the singlechip controller is generally required to be output to peripheral equipment in a wired or wireless mode, so that the test result is displayed by the peripheral equipment. Because the test circuit board needs to be connected with the tested circuit board through a plurality of interfaces, too many interfaces may cause the test circuit board to be relatively bulky, and too many external interfaces also increase the probability that a tester inserts a plug into a wrong interface in the test process, so that a test fault occurs.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the present invention is to provide a communication protocol loop switching circuit.
To achieve the above object, an embodiment of the present invention provides a communication protocol loop switching circuit, where the communication protocol loop switching circuit includes:
the first communication circuit is connected with a first communication interface of a controller so as to perform first communication protocol signal conversion on signals input and output by the first communication interface;
the second communication circuit is connected with a second communication interface of the controller so as to convert signals input and output by the second communication interface into second communication protocol signals;
and the communication signal selection control circuit is respectively connected with the first communication circuit, the second communication circuit and the controller so as to select input and output of the output signal of the first communication circuit or the second communication circuit.
Further, according to an embodiment of the present invention, the communication protocol loop switching circuit further includes a communication connector, the communication connector is connected to the communication signal selection control circuit, and the communication connector is further used for being connected to an external communication device.
Further, according to an embodiment of the present invention, the first communication circuit is a 485 protocol communication circuit, and the second communication circuit is a CAN protocol communication circuit.
Further, according to an embodiment of the present invention, the communication signal selection control circuit includes:
a relay RL6, a first channel of the relay RL6 is connected with the first communication circuit, a second channel of the relay RL6 is connected with the second communication circuit, and a common channel of the relay RL6 is connected with the communication connector;
and a collector of the triode Q6 is connected with a first magnetic control end of the relay RL6, and a second magnetic control end of the relay RL6 is connected with a power supply. The emitter of the transistor Q6 is connected to the ground reference, and the base of the transistor Q6 is connected to a control terminal of the controller through a first resistor R151.
Further, according to an embodiment of the present invention, the communication signal selection control circuit further includes a diode D18, an anode of the diode D18 is connected to the first magnetically controlled terminal of the relay RL6, and a cathode of the diode D18 is connected to the second magnetically controlled terminal of the relay RL 6.
Further, according to an embodiment of the present invention, the first communication circuit includes:
and a first signal end of the 485 protocol integrated circuit is connected with the controller, and a second signal end of the 485 protocol integrated circuit is connected with a first channel of the relay RL 6.
Further, according to an embodiment of the present invention, the first communication circuit further includes:
a first resistor R51, a second differential signal B interface of a second signal end of the 485 protocol integrated circuit being connected to one end of the first resistor R51, and the other end of the first resistor R51 being connected to a second port 9 of the first channel of the relay RL 6;
a second resistor R52, a first differential signal a interface of a second signal end of the 485 protocol integrated circuit being connected to one end of the second resistor R52, and the other end of the second resistor R52 being connected to the first port 2 of the first channel of the relay RL 6;
and a third resistor R53, wherein one end of the third resistor R53 is connected to the one end of the first resistor R51, and the other end of the third resistor R53 is connected to the other end of the first resistor R51.
Further, according to an embodiment of the present invention, the first communication circuit further includes:
a first regulator tube T4, one end of the first regulator tube T4 is connected with the other end of the first resistor R51, and the other end of the first regulator tube T4 is connected with a reference ground;
a second regulator tube T7, one end of the second regulator tube T7 is connected with the other end of the second resistor R52, and the other end of the second regulator tube T7 is connected with a reference ground;
and one end of the third voltage-regulator tube T6 is connected to the other end of the first resistor R51, and the other end of the third voltage-regulator tube T6 is connected to the other end of the second resistor R52.
Further, according to an embodiment of the present invention, the second communication circuit includes:
a first signal end of the CAN protocol integrated circuit is connected with the controller, and a second signal end of the CAN protocol integrated circuit is connected with a second channel of the relay RL 6;
further, according to an embodiment of the present invention, the second communication circuit further includes:
a fourth resistor R152, a first differential signal interface of a second signal end of the CAN protocol integrated circuit is connected with one end of the fourth resistor R152, and the other end of the fourth resistor R152 is connected with a first port of a second channel of the relay RL 6;
a fifth resistor R122, a second differential signal interface of a second signal end of the CAN protocol integrated circuit is connected to one end of the fifth resistor R122, and the other end of the fifth resistor R122 is connected to a second port of a second channel of the relay RL 6;
a sixth resistor R121, one end of the sixth resistor R121 being connected to the one end of the fourth resistor R152;
a seventh resistor R120, one end of the seventh resistor R120 being connected to the other end of the sixth resistor R121, and the other end of the seventh resistor R120 being connected to the one end of the fifth resistor R122;
a capacitor C84, one end of the capacitor C84 is connected with the one end of the seventh resistor R120, and the other end of the capacitor C84 is connected with the reference ground.
Further, according to an embodiment of the present invention, the second communication circuit further includes:
a fourth regulator tube T13, one end of the fourth regulator tube T13 is connected to the other end of the fourth resistor R152, and the other end of the fourth regulator tube T13 is connected to a reference ground;
a fifth regulator tube T12, one end of the fifth regulator tube T12 is connected with the other end of the fifth resistor R122, and the other end of the fifth regulator tube T12 is connected with a reference ground;
one end of the sixth voltage-regulator tube T16 is connected to the other end of the fourth resistor R152, and the other end of the sixth voltage-regulator tube T16 is connected to the other end of the fifth resistor R122.
The communication protocol loop switching circuit provided by the embodiment of the utility model performs first communication protocol signal conversion on the signal input and output by the first communication interface through the first communication circuit; the second communication circuit carries out second communication protocol signal conversion on the signal input and output by the second communication interface; in this way two different communication peripherals can be connected via the first communication circuit and the second communication circuit. And then the output signal of the first communication circuit or the second communication circuit is selected to be input and output by the controller. Therefore, one external communication interface can realize the selection of two paths of communication protocols of the single chip microcomputer controller to be output externally, the use of the interface is reduced, and the size of the test circuit board is reduced. Because the number of external communication interfaces is relatively small, the probability that the test fails due to the fact that a tester inserts the plug into the interface incorrectly in the test process is reduced.
Drawings
Fig. 1 is a block diagram of a communication protocol loop switching circuit according to an embodiment of the present invention;
fig. 2 is a first communication circuit diagram according to an embodiment of the present invention;
fig. 3 is a diagram of a second communication circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a communication signal selection control circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a communication connector according to an embodiment of the present invention.
Reference numerals:
a controller 10;
a first communication circuit 20;
a second communication circuit 30;
a communication signal selection control circuit 40;
a communication connector 50.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the utility model. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, an embodiment of the present invention provides a communication protocol loop switching circuit, including: the communication device comprises a first communication circuit 20, a second communication circuit 30 and a communication signal selection control circuit 40, wherein the first communication circuit 20 is connected with a first communication interface of a controller so as to perform first communication protocol signal conversion on signals input and output by the first communication interface; the second communication circuit 30 is connected to a second communication interface of the controller, so as to perform second communication protocol signal conversion on signals input and output by the second communication interface; the first communication circuit 20 and the second communication circuit are respectively connected with two communication interfaces of the controller through communication interfaces. In this way, the first communication circuit 20 can perform the first communication protocol conversion on the data output by the first communication interface and output the data. Similarly, the second communication circuit 30 may perform second communication protocol conversion on the data output by the second communication interface and then output the data.
The communication signal selection control circuit 40 is respectively connected with the first communication circuit 20, the second communication circuit 30 and the controller, so as to output signal selection input and output from the first communication circuit 20 or the second communication circuit 30; the communication protocol loop switching circuit further comprises a communication connector 50, the communication connector 50 is connected with the communication signal selection control circuit 40, and the communication connector 50 is further used for being connected with an external communication device. The signals output by the first communication circuit 20 and the second communication circuit 30 are respectively input to the communication signal selection control circuit 40, and the communication signal selection control circuit 40 selectively outputs one of the first communication circuit 20 and the second communication circuit 30 under the control of the controller, and is connected to an external device through the communication connector 50, so that the controller can communicate with the external device. Because the controller can select the first communication circuit 20 or the second communication circuit 30 to communicate according to the external devices with different protocol types, the use of the communication connector 50 can be reduced and the volume of the circuit board can be reduced while the communication of the external devices with different protocols is carried out.
The communication protocol loop switching circuit provided by the embodiment of the utility model is connected with a first communication interface of a controller through a first communication circuit 20 so as to perform first communication protocol signal conversion on signals input and output by the first communication interface; the second communication circuit 30 is connected to a second communication interface of the controller, so as to perform second communication protocol signal conversion on signals input and output by the second communication interface; two different communication peripherals can thus be connected via the first communication circuit 20 and the second communication circuit 30. And then the communication signal selection control circuit 40 is respectively connected with the first communication circuit 20, the second communication circuit 30 and the controller to select input and output of the output signal of the first communication circuit 20 or the second communication circuit 30, so that the single chip microcomputer selects one of the two paths to communicate with the external equipment through switching control of two paths of wired communication, selection of two paths of communication protocols of the single chip microcomputer controller to output externally can be realized through an external communication interface, the use of interfaces is reduced, the volume of a test circuit board is reduced, and the probability of test failure caused by plugging a plug into a wrong interface by a tester in the test process is reduced due to relatively few external communication interfaces.
Further, in an embodiment of the present invention, the first communication circuit 20 is a CAN protocol communication circuit, and the second communication circuit is a 485 protocol communication circuit. Because the CAN protocol and the 485 protocol have networking and long-distance signal transmission, the CAN protocol external equipment or the 485 protocol external equipment CAN be better connected.
Referring to fig. 4, the communication signal selection control circuit 40 includes: a relay RL6 and a triode Q6, wherein a first channel (2, 9) of the relay RL6 is connected with the first communication circuit 20, a second channel (4, 7) of the relay RL6 is connected with the second communication circuit 30, and a common channel (3, 8) of the relay RL6 is connected with the communication joint 50; and a conducting switch is arranged in the relay RL6 to selectively conduct the first channels (2, 9) or the second channels (4, 7) and the common channels (3, 8), so that the selective switching of the channels is realized, and signals of different communication protocols are selectively output, such as 485 protocol or CAN protocol signals.
The collector electrode of the triode Q6 is connected with the first magnetic control end (10) of the relay RL6, and the second magnetic control end (1) of the relay RL6 is connected with a power supply. The emitter of the transistor Q6 is connected to the ground reference, and the base of the transistor Q6 is connected to a CONTROL terminal of the controller through a first resistor R151 and a signal terminal COMM _ CONTROL. The triode Q6 is arranged between the first magnetic CONTROL end (10) of the relay RL6 and the reference ground to CONTROL the switch CONTROL power supply of the relay RL6, and the base electrode of the triode Q6 is connected with a CONTROL end of the controller through a first resistor R151 and a signal COMM _ CONTROL to selectively CONTROL the channel of the relay RL6 under the action of the controller. For example, when the COMM _ CONTROL signal is a high level signal, the transistor Q6 is turned on, and the relay RL6 is turned on to generate magnetic attraction. The second channels (4, 7) are communicated with the common channels (3, 8). Similarly, when the COMM _ CONTROL is a low level signal, the triode Q6 is turned off, the relay RL6 is not magnetically attracted, the conducting switch is reset, and the first channels (2 and 9) and the common channels (3 and 8) are conducted.
Referring to fig. 4, the communication signal selection control circuit 40 further includes a diode D18, an anode of the diode D18 is connected to the first magnetically controlled terminal (10) of the relay RL6, and a cathode of the diode D18 is connected to the second magnetically controlled terminal (1) of the relay RL 6. By connecting the diode D18 in parallel to the first magnetron end (10) and the second magnetron end (1) of the relay RL6, when the triode Q6 turns off the magnetron current of the relay RL6, the second magnetron end (1) of the relay RL6 is guided by the flyback high voltage generated by the relay RL6, so as to protect the triode Q6.
Referring to fig. 2, the first communication circuit 20 includes: a 485 protocol integrated circuit U5, wherein a first signal end (R, RE, DE, D) of the 485 protocol integrated circuit U5 is respectively connected with the controller through DAC _ RX, RE, DE, DAC _ TX, a second signal end (B, A) of the 485 protocol integrated circuit U5 is connected with a first channel (2, 9) of the relay RL6, so that a signal output by the singlechip controller is subjected to 485 protocol conversion and then output to the relay RL 6. As shown in fig. 2, the first communication circuit 20 further includes: a first resistor R51, a second resistor R52 and a third resistor R53, wherein a second differential signal interface B of a second signal end (A, B) of the 485 protocol integrated circuit U5 is connected with one end of the first resistor R51, and the other end of the first resistor R51 is connected with a second port (9) of a first channel (2, 9) of the relay RL 6; a first differential signal interface A of a second signal terminal (A, B) of the 485 protocol integrated circuit is connected with one end of the second resistor R52, and the other end of the second resistor R52 is connected with a first port (2) of a first channel (2, 9) of the relay RL 6; one end of the third resistor R53 is connected to the one end of the first resistor R51, and the other end of the third resistor R53 is connected to the other end of the first resistor R51. A differential signal matching circuit is formed among the first resistor R51, the second resistor R52 and the third resistor R53, so that the interference of common-mode signals is reduced, and the integrity of 485 differential signals is further guaranteed.
Referring to fig. 2, the first communication circuit 20 further includes: a first voltage regulator tube T4, a second voltage regulator tube T7 and a third voltage regulator tube T6, wherein one end of the first voltage regulator tube T4 is connected with the other end of the first resistor R51, and the other end of the first voltage regulator tube T4 is connected with a reference ground; one end of the second voltage regulator tube T7 is connected with the other end of the second resistor R52, and the other end of the second voltage regulator tube T7 is connected with the reference ground; one end of the third regulator tube T6 is connected to the other end of the first resistor R51, and the other end of the third regulator tube T6 is connected to the other end of the second resistor R52. The second voltage-regulator tube T7, the first voltage-regulator tube T4 and the second voltage-regulator tube T7 are respectively arranged on a differential line of the 485 protocol circuit, so that high-voltage pulse signals on the differential line are absorbed, and the 485 protocol integrated circuit U5 is prevented from being damaged by the high-voltage pulse signals.
Referring to fig. 3 and 4, the second communication circuit 30 includes: and first signal ends (TXD and RXD) of the CAN protocol integrated circuit are connected with the controller through CAN _ TX and CAN _ RX signal ends, and second signal ends (CANH and CANL) of the CAN protocol integrated circuit are connected with second channels (4 and 7) of the relay RL6 so as to output signals output by the singlechip controller to the relay RL6 after CAN protocol conversion. As shown in fig. 3, the second communication circuit 30 further includes: a fourth resistor R152, a fifth resistor R122, a sixth resistor R121, a seventh resistor R120 and a capacitor C84, wherein a first differential signal interface CANH of a second signal end of the CAN protocol integrated circuit U21 is connected with one end of the fourth resistor R152, and the other end of the fourth resistor R152 is connected with a first port 4 of a second channel of the relay RL 6; a second differential signal interface CANL of a second signal end of the CAN protocol integrated circuit is connected with one end of the fifth resistor R122, and the other end of the fifth resistor R122 is connected with a second port 7 of a second channel of the relay RL 6; one end of the sixth resistor R121 is connected to the one end of the fourth resistor R152; one end of the seventh resistor R120 is connected to the other end of the sixth resistor R121, and the other end of the seventh resistor R120 is connected to the one end of the fifth resistor R122; one end of the capacitor C84 is connected to the one end of the seventh resistor R120, and the other end of the capacitor C84 is connected to a ground reference. A differential signal matching circuit is formed among the fourth resistor R152, the fifth resistor R122, the sixth resistor R121, the seventh resistor R120 and the capacitor C84, so that the interference of common-mode signals is reduced, and the integrity of CAN differential signals is further guaranteed.
Referring to fig. 3, the second communication circuit 30 further includes: a fourth regulator tube T13, a fifth regulator tube T12 and a sixth regulator tube T16, wherein one end of the fourth regulator tube T13 is connected with the other end of the fourth resistor R152, and the other end of the fourth regulator tube T13 is connected with a reference ground; one end of the fifth regulator tube T12 is connected with the other end of the fifth resistor R122, and the other end of the fifth regulator tube T12 is connected with a reference ground; one end of the sixth regulator tube T16 is connected to the other end of the fourth resistor R152, and the other end of the sixth regulator tube T16 is connected to the other end of the fifth resistor R122. As shown in fig. 2, the fourth voltage regulator tube T13, the fifth voltage regulator tube T12 and the sixth voltage regulator tube T16 are respectively arranged on the differential line of the 485 protocol circuit to absorb the high-voltage pulse signal on the differential line, so as to avoid the high-voltage pulse signal from damaging the CAN protocol integrated circuit U21.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments. All equivalent structures made by using the contents of the specification and the attached drawings of the utility model can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the utility model.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A communication protocol loop switching circuit, comprising:
the first communication circuit is connected with a first communication interface of a controller so as to convert signals input and output by the first communication interface into first communication protocol signals;
the second communication circuit is connected with a second communication interface of the controller so as to convert signals input and output by the second communication interface into second communication protocol signals;
and the communication signal selection control circuit is respectively connected with the first communication circuit, the second communication circuit and the controller so as to select input and output of the output signal of the first communication circuit or the second communication circuit.
2. The communication protocol loop switching circuit of claim 1, further comprising a communication connector, wherein the communication connector is connected to the communication signal selection control circuit, and the communication connector is further used for connecting to an external communication device.
3. The communication protocol loop switching circuit of claim 2 wherein the first communication circuit is a 485 protocol communication circuit and the second communication circuit is a CAN protocol communication circuit.
4. The communication protocol loop switching circuit of claim 3, wherein the communication signal selection control circuit comprises:
a relay (RL6), a first channel of the relay (RL6) being connected with the first communication circuit, a second channel of the relay (RL6) being connected with the second communication circuit, a common channel of the relay (RL6) being connected with the communication junction;
the collector of the triode (Q6) is connected with the first magnetic control end of the relay (RL6), the second magnetic control end of the relay (RL6) is connected with a power supply, the emitter of the triode (Q6) is connected with a reference ground, and the base of the triode (Q6) is connected with a control end of the controller through a first resistor R151.
5. The communication protocol loop switching circuit of claim 4, wherein the communication signal selection control circuit further comprises a diode (D18), wherein an anode of the diode (D18) is connected to the first magnetically controlled terminal of the relay (RL6), and a cathode of the diode (D18) is connected to the second magnetically controlled terminal of the relay (RL 6).
6. The communication protocol loop switching circuit of claim 4, wherein the first communication circuit comprises:
and a 485 protocol integrated circuit, wherein a first signal end of the 485 protocol integrated circuit is connected with the controller, and a second signal end of the 485 protocol integrated circuit is connected with a first channel of the relay (RL 6).
7. The communication protocol loop switching circuit of claim 6, wherein the first communication circuit further comprises:
a first resistor (R51), wherein a second differential signal (B) interface of a second signal end of the 485 protocol integrated circuit is connected with one end of the first resistor (R51), and the other end of the first resistor (R51) is connected with a second port (9) of a first channel of the relay (RL 6);
a second resistor (R52), wherein a first differential signal (A) interface of a second signal terminal of the 485 protocol integrated circuit is connected with one end of the second resistor (R52), and the other end of the second resistor (R52) is connected with a first port (2) of a first channel of the relay (RL 6);
a third resistor (R53), one end of the third resistor (R53) being connected to the one end of the first resistor (R51), the other end of the third resistor (R53) being connected to the other end of the first resistor (R51).
8. The communication protocol loop switching circuit of claim 7, wherein the first communication circuit further comprises:
a first regulator tube (T4), one end of the first regulator tube (T4) is connected with the other end of the first resistor (R51), and the other end of the first regulator tube (T4) is connected with a reference ground;
a second regulator tube (T7), one end of the second regulator tube (T7) is connected with the other end of the second resistor (R52), and the other end of the second regulator tube (T7) is connected with a reference ground;
and one end of the third voltage-regulator tube (T6) is connected with the other end of the first resistor (R51), and the other end of the third voltage-regulator tube (T6) is connected with the other end of the second resistor (R52).
9. The communication protocol loop switching circuit of claim 4, wherein the second communication circuit comprises:
a CAN protocol integrated circuit, wherein a first signal end of the CAN protocol integrated circuit is connected with the controller, and a second signal end of the CAN protocol integrated circuit is connected with a second channel of the relay (RL 6);
a fourth resistor (R152), wherein a first differential signal interface of a second signal end of the CAN protocol integrated circuit is connected with one end of the fourth resistor (R152), and the other end of the fourth resistor (R152) is connected with a first port of a second channel of the relay (RL 6);
a fifth resistor (R122), wherein a second differential signal interface of a second signal end of the CAN protocol integrated circuit is connected with one end of the fifth resistor (R122), and the other end of the fifth resistor (R122) is connected with a second port of a second channel of the relay (RL 6);
a sixth resistor (R121), one end of the sixth resistor (R121) being connected to the one end of the fourth resistor (R152);
a seventh resistor (R120), one end of the seventh resistor (R120) being connected to the other end of the sixth resistor (R121), the other end of the seventh resistor (R120) being connected to the one end of the fifth resistor (R122);
a capacitor (C84), one end of the capacitor (C84) being connected to the one end of the seventh resistor (R120), the other end of the capacitor (C84) being connected to a reference ground.
10. The communication protocol loop switching circuit of claim 9, wherein the second communication circuit further comprises:
a fourth regulator tube (T13), one end of the fourth regulator tube (T13) is connected with the other end of the fourth resistor (R152), and the other end of the fourth regulator tube (T13) is connected with a reference ground;
a fifth regulator tube (T12), one end of the fifth regulator tube (T12) is connected with the other end of the fifth resistor (R122), and the other end of the fifth regulator tube (T12) is connected with a reference ground;
and one end of the sixth voltage-regulator tube (T16) is connected with the other end of the fourth resistor (R152), and the other end of the sixth voltage-regulator tube (T16) is connected with the other end of the fifth resistor (R122).
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| CN202121680695.4U CN216449904U (en) | 2021-07-22 | 2021-07-22 | Communication protocol loop switching circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115489651A (en) * | 2022-10-31 | 2022-12-20 | 雅迪科技集团有限公司 | Electric vehicle instrument and electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115489651A (en) * | 2022-10-31 | 2022-12-20 | 雅迪科技集团有限公司 | Electric vehicle instrument and electric vehicle |
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