UART-CAN bus monitoring device for automobile lamp
The UART-CAN bus monitoring device converts the lamp status into a USB signal, which solves the problem of inconvenient monitoring in the existing technology and realizes convenient reading and stable communication of the lamp status.
Patent Information
- Application Number
- CN202422490334.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-10-15
AI Technical Summary
In the prior art, the process of monitoring messages on the UART-CAN bus of a headlight using a logic analyzer requires reading DID information through a headlight controller such as an HCM or RCM, which makes monitoring inconvenient.
A UART-CAN bus monitoring device is designed, which includes a driver chip, a monitoring module and a PC host. The driver chip converts the lamp status into a UART-CAN signal, and the CAN transceiver and USB-to-serial port chip convert the signal into a USB signal, which is directly transmitted to the PC host.
The lamp status can be read simply and conveniently without additional analysis. Digital messages can be directly obtained using the serial port assistant. Communication stability is ensured by the terminal resistor.
Smart Images
Figure CN223488453U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive electronics technology, and more specifically, to a UART-CAN bus monitoring device for automotive lights. Background Technology
[0002] Currently, automotive lighting is increasingly trending towards digitalization and intelligence. Designs often employ linear LED driver chips such as TPS929120 and TPS929240, as well as LED matrix control chips such as TPS92662 and TPS92664. The controller ECU uses UART-CAN to control and monitor the LEDs' status. All LED control strategies and LED status information can be obtained by monitoring messages on the UART-CAN bus. Parsing messages on the UART-CAN bus is a crucial technical method for automotive lighting fault analysis.
[0003] However, in actual construction, there is a problem: the existing technology for monitoring the process of capturing messages on the vehicle headlight UART-CAN bus through a logic analyzer requires reading the headlight DID information through a headlight controller such as HCM or RCM, and then analyzing the headlight status to achieve monitoring of the headlight status. This requires additional analysis and is not convenient or fast. Utility Model Content
[0004] This invention solves the problem in the existing technology that the monitoring process of capturing messages on the vehicle headlight UART-CAN bus using a logic analyzer requires reading the headlight DID information through a headlight controller such as HCM or RCM, and then analyzing the headlight status to achieve monitoring of the headlight status. This process requires additional analysis and is not convenient or fast.
[0005] To address the aforementioned problems, this utility model provides a UART-CAN bus monitoring device for automotive lights, used to monitor the status of the lights. The UART-CAN bus monitoring device includes: a driver chip, used for converting between the light status and UART-CAN signals; a monitoring module, used for converting between UART-CAN signals and USB signals; and a PC host, connected to the monitoring module and used to read USB signals.
[0006] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: This application converts the lamp status into a UART-CAN signal through a driver chip, and then converts the UART-CAN signal into a USB signal through a monitoring module, and finally transmits it directly to the PC host, so that the PC host can read the lamp status. It is simple and convenient and does not require additional analysis.
[0007] In one embodiment of this utility model, the monitoring module includes: a CAN transceiver, which is connected to a driver chip and is used for conversion between UART-CAN signals and TTL serial port signals; a USB to serial port chip, which is connected to the CAN transceiver and is used for conversion between TTL serial port signals and USB signals; and a USB interface, which is connected to the USB to serial port chip and is used to transmit USB signals to a PC host.
[0008] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: The principle of this application is: the lamp status is converted from the driver chip to the UART-CAN bus, the UART-CAN signal is captured by the CAN transceiver and converted into a TTL serial port signal, and then the TTL serial port signal is converted into a USB signal by the USB to serial port chip, and finally the corresponding signal is transmitted to the PC host through the USB interface.
[0009] In one embodiment of this utility model, the UART-CAN bus monitoring device further includes: a UART-CAN bus, which connects the driver chip and the monitoring module.
[0010] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: This application can directly read UART-CAN bus information using a serial port assistant and can directly obtain digital messages. UART-CAN is a means of transmitting UART signals in the physical form of CAN. Physically, it adopts the CAN format, but the content is UART signals. It does not follow the CAN protocol and is applied after the CAN transceiver in this application.
[0011] In one embodiment of this utility model, the CAN transceiver has a first transceiver pin, a fourth transceiver pin, a sixth transceiver pin, and a seventh transceiver pin, and the sixth transceiver pin and the seventh transceiver pin are connected to the UART-CAN bus; the USB to serial port chip has a first chip pin, a second chip pin, a sixth chip pin, and a seventh chip pin, and the sixth chip pin is connected to the first transceiver pin, and the seventh chip pin is connected to the fourth transceiver pin; the USB interface has a second interface pin and a third interface pin, and the second interface pin is connected to the second chip pin, and the third interface pin is connected to the first chip pin.
[0012] Compared with existing technologies, the technical effects achieved by this solution are as follows: The first transceiver pin of the CAN transceiver is the TXD port, which is the transmission signal port; the fourth transceiver pin is the RXD port, which is the receive signal port; the sixth transceiver pin is the CANL port, which is the high bus port; and the seventh transceiver pin is the CANH port, which is the low bus port. The first chip pin of the USB-to-serial chip is the UD+ port, which is directly connected to the D+ data line of the USB bus; the second chip pin is the UD- port, which is directly connected to the D- data line of the USB bus; the sixth chip pin is the TXD port, which is the serial data output port; and the seventh chip pin is the RXD port, which is the serial data input port, with built-in controllable pull-up and pull-down resistors. The second interface pin of the USB interface is the D+ interface, and the third interface pin is the D- interface. The chip is powered by 5V output from the VCC pin of the USB interface. In the design, the D+ and D- pins of the USB interface are directly connected to the UD+ and UD- pins of the USB-to-serial chip. The USB signal is converted into a TTL serial signal by the USB-to-serial chip, and the TXD and RXD pins of the USB-to-serial chip are connected to the TXD and RXD pins of the CAN transceiver. The TTL serial signal is converted into a UART-CAN signal by the CAN transceiver, and connected to the UART-CAN bus through the CANH and CANL pins of the CAN transceiver, thus achieving complete communication.
[0013] In one embodiment of this utility model, the monitoring module further includes: a first light-emitting diode, the positive terminal of the first light-emitting diode being connected to the first interface pin of the USB interface and the fifth chip pin of the USB to serial port chip, and the negative terminal of the first light-emitting diode being grounded.
[0014] Compared with the existing technology, the technical effects achieved by adopting this technical solution are as follows: the first interface pin is the VCC interface, the fifth chip pin is the VCC port, the positive terminal of the first light-emitting diode is connected to the first interface pin and the fifth chip pin, and the first light-emitting diode is a power indicator light used to confirm whether the communication of the UART-CAN bus monitoring device is normal; when the first light-emitting diode lights up, it proves that the UART-CAN bus monitoring device is working normally.
[0015] In one embodiment of this utility model, the monitoring module further includes: a second light-emitting diode, the negative terminal of which is connected to the seventh chip pin and the positive terminal of which is connected to a 5V power supply; and a third light-emitting diode, the negative terminal of which is connected to the sixth chip pin and the positive terminal of which is connected to a 5V power supply.
[0016] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: The negative terminal of the second LED is connected to the RXD port of the USB to serial port chip, and the positive terminal is connected to the 5V power supply. The second LED is used to prove the existence of communication and will light up when sending or receiving data; The negative terminal of the third LED is connected to the TXD port of the USB to serial port chip, and the positive terminal is connected to the 5V power supply. The third LED is used to prove the existence of communication and will light up when sending or receiving data.
[0017] In one embodiment of this utility model, the monitoring module further includes: a first capacitor, one end of which is connected to the fourth chip pin of the USB to serial port chip, and the other end is grounded; a second capacitor, one end of which is connected to the first interface pin, and the other end is grounded; a third capacitor, one end of which is connected to the fifth chip pin of the USB to serial port chip, and the other end is grounded; and a fourth capacitor, one end of which is connected to the eighth chip pin of the USB to serial port chip, and the other end is grounded.
[0018] Compared with existing technologies, the technical effects achieved by this solution are as follows: The fourth chip pin of the USB-to-serial chip is the RTS# port, which is the MODEM communication output signal port used to request transmission; the fifth chip pin is the VCC port, which is the positive power input port; the eighth chip pin is the V3 port; the first capacitor is connected between the RTS# port and ground to prevent the signal of the RTS# input pin from being interfered with by high-frequency signals; the second capacitor is connected between the first interface pin of the USB interface and ground to filter LED1 and ensure its voltage stability; the third capacitor is connected between the VCC port of the USB-to-serial chip and ground to filter the power supply of the USB-to-serial chip and ensure a stable 5V input; the fourth capacitor is connected between the V3 port of the USB-to-serial chip and ground as a decoupling capacitor to ensure that the excitation signal generated by the internal circuit is output without affecting the internal circuit.
[0019] In one embodiment of this utility model, the monitoring module further includes: a first resistor, one end of which is connected to the negative terminal of the first light-emitting diode and the other end is grounded; a second resistor, one end of which is connected to the seventh chip pin and the other end of which is connected to the negative terminal of the second light-emitting diode; a third resistor, one end of which is connected to the sixth chip pin and the other end of which is connected to the negative terminal of the third light-emitting diode; and a fourth resistor, one end of which is connected to the eighth transceiver pin of the CAN transceiver and the other end of which is grounded.
[0020] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: The first resistor is a current-limiting resistor to ensure that the first LED does not bear excessive power; the second resistor is a current-limiting resistor to ensure that the second LED does not bear excessive power; the third resistor is a current-limiting resistor to ensure that the third LED does not bear excessive power; the eighth transceiver pin is the STB port, which is the standby mode control port; one end of the fourth resistor is connected to the eighth transceiver pin of the CAN transceiver, and the other end is grounded. The fourth resistor is a pull-down resistor, which makes the grounding of the STB pin more stable.
[0021] In one embodiment of this utility model, the monitoring module further includes: a fifth resistor, one end of which is connected to the seventh transceiver pin and the other end is grounded; a sixth resistor, one end of which is connected to the sixth transceiver pin and the other end is grounded; and a terminating resistor switch, which connects the sixth transceiver pin, the seventh transceiver pin, the fifth resistor, and the sixth resistor.
[0022] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: The fifth and sixth resistors are terminating resistors in the CAN bus, ensuring stable communication. In the CAN network, terminating resistors need to be added at both ends to ensure stable communication. This provides a monitorable condition for samples without terminating resistors. If the headlights connected to the application do not have terminating resistors, the terminating resistor switch is turned ON to activate the terminating resistor on the application, ensuring that the headlights receive stable UART-CAN signals. If the headlights connected to the application have terminating resistors, no additional terminating resistors are needed. The terminating resistor switch is turned OFF to turn off the terminating resistor on the application.
[0023] In one embodiment of this utility model, the CAN transceiver is model TCAN1042HDR; the USB to serial port chip is model CH340N; and the USB interface is model AM90.
[0024] By adopting the technical solution of this utility model, the following technical effects can be achieved:
[0025] (1) This application converts the lamp status into a UART-CAN signal through a driver chip, and then converts the UART-CAN signal into a USB signal through a monitoring module, and finally transmits it directly to the PC host, so that the PC host can read the lamp status. It is simple and convenient and does not require additional analysis.
[0026] (2) This application can directly read UART-CAN bus information using a serial port assistant and can directly obtain digital messages;
[0027] (3) The fifth and sixth resistors are the terminating resistors in the CAN bus to ensure stable communication. In the CAN network, terminating resistors need to be added at both ends to ensure stable communication of the CAN network, providing a monitorable condition for the sample without terminating resistors. Attached Figure Description
[0028] Figure 1 A frame diagram of a UART-CAN bus monitoring device for automotive lights provided in Embodiment 1 of this utility model;
[0029] Figure 2 for Figure 1 Circuit diagram of the monitoring module. Detailed Implementation
[0030] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0031] Example 1
[0032] See Figure 1 This utility model provides a UART-CAN bus monitoring device for automotive lights, used to monitor the status of the lights, combined with... Figure 2 The UART-CAN bus monitoring device includes a driver chip, a monitoring module, and a PC host. The driver chip is used for the conversion between the lamp status and UART-CAN signals; the monitoring module is used for the conversion between UART-CAN signals and USB signals; and the PC host is connected to the monitoring module and is used to read USB signals.
[0033] In one specific embodiment, this application converts the lamp status into a UART-CAN signal through a driver chip, then converts the UART-CAN signal into a USB signal through a monitoring module, and finally transmits it directly to the PC host, enabling the PC host to read the lamp status. This is simple and convenient, requiring no additional analysis.
[0034] Furthermore, the monitoring module includes: a CAN transceiver, a USB-to-serial chip, and a USB interface. The CAN transceiver is connected to the driver chip and is used for conversion between UART-CAN signals and TTL serial signals; the USB-to-serial chip is connected to the CAN transceiver and is used for conversion between TTL serial signals and USB signals; the USB interface is connected to the USB-to-serial chip and is used to transmit USB signals to the PC host.
[0035] Specifically, the principle of this application is as follows: the status of the lamp is converted from the driver chip to the UART-CAN bus, captured by the CAN transceiver and converted into a TTL serial port signal, and then the TTL serial port signal is converted into a USB signal by the USB to serial port chip, and finally the corresponding signal is transmitted to the PC host through the USB interface.
[0036] Typically, CAN transceivers are used to convert between UART-CAN signals and serial port signals. The serial port signal is a UART signal, which is also a TTL serial port signal. For clarity, this application uses TTL serial port signal to represent the serial port signal.
[0037] Furthermore, the UART-CAN bus monitoring device also includes: a UART-CAN bus, which connects the driver chip and the monitoring module.
[0038] Specifically, this application allows direct reading of UART-CAN bus information using a serial port assistant, enabling direct acquisition of digital messages. UART-CAN is a means of transmitting UART signals in the physical form of CAN. Physically, it adopts the CAN format, but the content is UART signals. It does not follow the CAN protocol and is used after the CAN transceiver in this application.
[0039] Furthermore, the CAN transceiver has a first transceiver pin, a fourth transceiver pin, a sixth transceiver pin, and a seventh transceiver pin, and the sixth transceiver pin and the seventh transceiver pin are connected to the UART-CAN bus; the USB to serial port chip has a first chip pin, a second chip pin, a sixth chip pin, and a seventh chip pin, and the sixth chip pin is connected to the first transceiver pin, and the seventh chip pin is connected to the fourth transceiver pin; the USB interface has a second interface pin and a third interface pin, and the second interface pin is connected to the second chip pin, and the third interface pin is connected to the first chip pin.
[0040] Specifically, the first transceiver pin of CAN transceiver U2 is the TXD port, which is the transmission signal port; the fourth transceiver pin is the RXD port, which is the receive signal port; the sixth transceiver pin is the CANL port, which is the high bus port; and the seventh transceiver pin is the CANH port, which is the low bus port. The first chip pin of USB-to-serial chip U1 is the UD+ port, which is directly connected to the D+ data line of the USB bus; the second chip pin is the UD- port, which is directly connected to the D- data line of the USB bus; the sixth chip pin is the TXD port, which is the serial data output port; and the seventh chip pin is the RXD port, which is the serial data input port, with built-in controllable pull-up and pull-down resistors. The second interface pin of USB interface USB1 is the D+ interface, and the third interface pin is the D- interface. The chip is powered by 5V output from the VCC pin of the USB interface. In the design, the D+ and D- pins of the USB interface are directly connected to the UD+ and UD- pins of the USB-to-serial chip. The USB signal is converted into a TTL serial signal by the USB-to-serial chip, and the TXD and RXD pins of the USB-to-serial chip are connected to the TXD and RXD pins of the CAN transceiver. The TTL serial signal is converted into a UART-CAN signal by the CAN transceiver, and connected to the UART-CAN bus through the CANH and CANL pins of the CAN transceiver, thus achieving complete communication.
[0041] Preferably, the CANL port and CANH port are connected to two pins of terminal block P1 respectively, and are connected to the UART-CAN bus through the CANL port and CANH port to realize communication. The terminal block P1 is model WJ126V-5.0-2P.
[0042] Furthermore, the monitoring module also includes: a first light-emitting diode, the positive terminal of which is connected to the first interface pin of the USB interface and the fifth chip pin of the USB to serial port chip, and the negative terminal of the first light-emitting diode is grounded.
[0043] Specifically, the first interface pin is the VCC interface, the fifth chip pin is the VCC port, the first light-emitting diode is LED1, the positive terminal of LED1 is connected to the first interface pin and the fifth chip pin, LED1 is a power indicator, and LED1 is used to confirm whether the communication of the UART-CAN bus monitoring device is normal; when LED1 is lit, it proves that the UART-CAN bus monitoring device is working normally.
[0044] Preferably, the first light-emitting diode is model XL-1608SURC-06.
[0045] Furthermore, the monitoring module also includes a second LED and a third LED. The negative terminal of the second LED is connected to the seventh chip pin, and the positive terminal is connected to the 5V power supply. The negative terminal of the third LED is connected to the sixth chip pin, and the positive terminal is connected to the 5V power supply.
[0046] Specifically, the second LED is LED2, with its negative terminal connected to the RXD port of the USB-to-serial chip and its positive terminal connected to a 5V power supply. The second LED is used to demonstrate the existence of communication and will light up when sending or receiving data. The third LED is LED3, with its negative terminal connected to the TXD port of the USB-to-serial chip and its positive terminal connected to a 5V power supply. The third LED is used to demonstrate the existence of communication and will light up when sending or receiving data.
[0047] Preferably, the second light-emitting diode is model XL-1608UBC-04; the third light-emitting diode is model SZYY0603G.
[0048] Furthermore, the monitoring module also includes: a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor. One end of the first capacitor is connected to the fourth chip pin of the USB to serial port chip, and the other end is grounded. One end of the second capacitor is connected to the first interface pin, and the other end is grounded. One end of the third capacitor is connected to the fifth chip pin of the USB to serial port chip, and the other end is grounded. One end of the fourth capacitor is connected to the eighth chip pin of the USB to serial port chip, and the other end is grounded.
[0049] Specifically, the fourth pin of the USB-to-serial chip is the RTS# port, which is the MODEM communication output signal port used to request transmission; the fifth pin is the VCC port, which is the positive power input port; the eighth pin is the V3 port; the first capacitor is C1, which is connected between the RTS# port and ground, and is used to prevent the signal of the RTS# input pin from being interfered with by high-frequency signals; the second capacitor is C2, which is connected between the first interface pin of the USB interface and ground, and is used to filter LED1 to ensure its voltage stability; the third capacitor is C3, which is connected between the VCC port of the USB-to-serial chip and ground, and is used to filter the power supply of the USB-to-serial chip to ensure a stable 5V input; the fourth capacitor is C4, which is connected between the V3 port of the USB-to-serial chip and ground, and is a decoupling capacitor to ensure that the excitation signal generated by the internal circuit is output without affecting the internal circuit.
[0050] Preferably, the capacitance value of C1 is 100nF, the capacitance value of C2 is 10uF, the capacitance value of C3 is 100nF, and the capacitance value of C4 is 100nF.
[0051] Furthermore, the monitoring module also includes: a first resistor, a second resistor, a third resistor, and a fourth resistor. One end of the first resistor is connected to the negative terminal of the first LED, and the other end is grounded. One end of the second resistor is connected to the seventh chip pin, and the other end is connected to the negative terminal of the second LED. One end of the third resistor is connected to the sixth chip pin, and the other end is connected to the negative terminal of the third LED. One end of the fourth resistor is connected to the eighth transceiver pin of the CAN transceiver, and the other end is grounded.
[0052] Specifically, the first resistor is R1, which is connected between the first LED and ground. R1 is a current-limiting resistor to ensure that LED1 does not receive excessive power. The second resistor is R2, with one end connected to the negative terminal of the second LED and the other end connected to the seventh chip pin of the USB to serial port chip. R2 is a current-limiting resistor to ensure that LED2 does not receive excessive power. The third resistor is R3, with one end connected to the negative terminal of the third LED and the other end connected to the sixth chip pin of the USB to serial port chip. R3 is a current-limiting resistor to ensure that LED3 does not receive excessive power. The eighth transceiver pin is the STB port, which is the standby mode control port. The fourth resistor is R4, with one end connected to the eighth transceiver pin of the CAN transceiver and the other end grounded. R4 is a pull-down resistor to make the STB pin grounded more stably.
[0053] Preferably, R1 is 2kΩ, R2 is 2kΩ, R3 is 2kΩ, and R4 is 10kΩ.
[0054] Furthermore, the monitoring module also includes: a fifth resistor, a sixth resistor, and a terminating resistor switch. One end of the fifth resistor is connected to the seventh transceiver pin, and the other end is grounded. One end of the sixth resistor is connected to the sixth transceiver pin, and the other end is grounded. The terminating resistor switch connects the sixth transceiver pin, the seventh transceiver pin, the fifth resistor, and the sixth resistor.
[0055] Specifically, the fifth resistor is R5, the sixth resistor is R6, and the terminating resistor switch is SW1. R5 and R6 are terminating resistors in the CAN bus to ensure stable communication. In a CAN network, terminating resistors need to be added at both ends to ensure stable communication. If the headlights connected to the application do not have terminating resistors, switch SW1 to ON to activate the terminating resistors on the application, ensuring that the headlights receive stable UART-CAN signals. If the headlights connected to the application already have terminating resistors, no additional terminating resistors are needed; switch SW1 to OFF to deactivate the terminating resistors on the application.
[0056] Furthermore, the CAN transceiver is model TCAN1042HDR; the USB to serial port chip is model CH340N; and the USB interface is model AM90.
[0057] Specifically, the CAN transceiver is model TCAN1042HDR. It also has a second, third, and fifth transceiver pin. The second transceiver pin is a GND port, which is grounded; the third transceiver pin is a VCC port, connected to a 5V power supply; and the fifth transceiver pin is an NC port. The USB-to-serial chip is model CH340N. It also has a third chip pin, which is a GND port, serving as the common ground and directly connected to the USB bus ground. The USB interface is model AM90. It also has a fourth interface pin, which is a GND port and grounded.
[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A UART-CAN bus monitoring device for automotive lights, wherein the UART-CAN bus monitoring device is used to monitor the status of the lights, characterized in that, The UART-CAN bus monitoring device includes: The driver chip is used for switching between the lamp status and the UART-CAN signal; The monitoring module is used for the conversion between the UART-CAN signal and the USB signal; The PC host is connected to the monitoring module and is used to read the USB signal.
2. The UART-CAN bus monitoring device according to claim 1, characterized in that, The monitoring module includes: A CAN transceiver, which is connected to the driver chip and is used for the conversion between the UART-CAN signal and the TTL serial port signal; A USB-to-serial chip is connected to the CAN transceiver and is used for conversion between the TTL serial port signal and the USB signal. The USB interface is connected to the USB-to-serial chip and is used to transmit the USB signal to the PC host.
3. The UART-CAN bus monitoring device according to claim 2, characterized in that, The UART-CAN bus monitoring device also includes: The UART-CAN bus connects the driver chip and the monitoring module.
4. The UART-CAN bus monitoring device according to claim 3, characterized in that, The CAN transceiver is provided with a first transceiver pin, a fourth transceiver pin, a sixth transceiver pin, and a seventh transceiver pin, and the sixth transceiver pin and the seventh transceiver pin are connected to the UART-CAN bus; The USB to serial port chip has a first chip pin, a second chip pin, a sixth chip pin, and a seventh chip pin, wherein the sixth chip pin is connected to the first transceiver pin, and the seventh chip pin is connected to the fourth transceiver pin; The USB interface has a second interface pin and a third interface pin, and the second interface pin is connected to the second chip pin, and the third interface pin is connected to the first chip pin.
5. The UART-CAN bus monitoring device according to claim 4, characterized in that, The monitoring module also includes: The first light-emitting diode has its positive terminal connected to the first interface pin of the USB interface and the fifth chip pin of the USB to serial port chip, and its negative terminal grounded.
6. The UART-CAN bus monitoring device according to claim 5, characterized in that, The monitoring module also includes: The second light-emitting diode has its negative terminal connected to the pin of the seventh chip and its positive terminal connected to a 5V power supply. The third light-emitting diode has its negative terminal connected to the pin of the sixth chip and its positive terminal connected to a 5V power supply.
7. The UART-CAN bus monitoring device according to claim 5, characterized in that, The monitoring module also includes: The first capacitor has one end connected to the fourth chip pin of the USB to serial port chip, and the other end grounded. The second capacitor has one end connected to the first interface pin and the other end grounded. The third capacitor has one end connected to the fifth chip pin of the USB to serial port chip, and the other end grounded. The fourth capacitor has one end connected to the eighth chip pin of the USB to serial port chip, and the other end grounded.
8. The UART-CAN bus monitoring device according to claim 6, characterized in that, The monitoring module also includes: The first resistor has one end connected to the negative terminal of the first light-emitting diode and the other end grounded. The second resistor has one end connected to the pin of the seventh chip and the other end connected to the negative terminal of the second light-emitting diode; The third resistor has one end connected to the sixth chip pin and the other end connected to the negative terminal of the third light-emitting diode. The fourth resistor has one end connected to the eighth transceiver pin of the CAN transceiver and the other end grounded.
9. The UART-CAN bus monitoring device according to claim 4, characterized in that, The monitoring module also includes: The fifth resistor has one end connected to the seventh transceiver pin and the other end grounded. The sixth resistor has one end connected to the sixth transceiver pin and the other end grounded. A terminating resistor switch is provided, which is connected to the sixth transceiver pin, the seventh transceiver pin, the fifth resistor, and the sixth resistor.
10. The UART-CAN bus monitoring device according to any one of claims 2-9, characterized in that, The CAN transceiver is model TCAN1042HDR; The model of the USB to serial port chip is CH340N; The USB interface is model AM90.