Portable CAN optical fiber two-channel communication test system

Abstract

The utility model discloses a portable CAN optical fiber two-channel communication test system, and belongs to the technical field of coal mining machine communication test. According to the utility model, a test signal is sent to the CAN transceiver through the CAN controller, the CAN transceiver converts the test signal into a differential signal, the CAN isolator forwards the differential signal to a CAN bus network to be tested, and the CAN-to-optical fiber isolator converts the differential signal into an optical signal and sends the optical signal to an optical fiber network to be tested. The to-be-tested optical fiber network is connected to the test circuit of the CAN bus through the CAN-to-optical fiber isolator, optical fiber testing is achieved, the utilization rate of the CAN controller is improved, and compared with the mode that a set of optical fiber network testing device is directly added, the cost of the system is lower, and the size of the testing system is smaller. The problem that an existing testing device cannot adapt to the communication environment where the optical fiber and the CAN bus coexist is solved, and the communication testing efficiency of the coal mining machine is improved.

Description

Technical Field

[0001] This utility model belongs to the field of communication testing technology for coal mining machines, specifically relating to a portable CAN fiber optic dual-channel communication testing system. Background Technology

[0002] As coal mining faces expand and extend deeper, the demands on communication transmission become increasingly stringent. Fiber optic communication provides stable data transmission, ensuring real-time communication between the coal mining machine and the monitoring center, thus providing strong support for remote monitoring and control of the coal mining machine. Furthermore, fiber optic communication enables parallel transmission of multiple signals, improving the efficiency and reliability of data transmission.

[0003] To ensure communication reliability, communication network testing is generally required. For example, patent document CN220605939U discloses a CAN communication tester for coal mining machines, designed to test the communication status of coal mining machine communication equipment to ensure communication reliability. Since previous coal mining machines primarily relied on CAN bus communication, existing communication testing devices mainly test CAN bus networks. While there are testing devices for fiber optic communication in other fields, they test only the optical fiber. These are unsuitable for the coexisting communication environment of fiber optics and CAN bus in coal mining machines, requiring the identification of specific testing equipment for each test, thus impacting testing efficiency.

[0004] In summary, existing testing equipment cannot adapt to the communication environment where fiber optic cables and CAN buses coexist, affecting the communication testing efficiency of coal mining machines. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a portable CAN fiber optic dual-channel communication test system that addresses the shortcomings of the prior art. The system is designed to be portable, has a simple structure, is highly versatile, and is easy to promote and use.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A portable CAN fiber optic dual-channel communication test system includes a CAN controller, a CAN transceiver, a CAN isolator, a CAN-to-fiber optic isolator, and a power module;

[0008] The CAN controller is used to send and receive test signals. The PA and PB pins of the CAN controller are connected to the TXD and RXD pins of the CAN transceiver, respectively, for transmitting test signals.

[0009] The CAN transceiver is used for the conversion between digital signals and differential signals. The CAN-H and CAN-L pins of the CAN transceiver are connected to the CANF-L and CANF-H pins of the CAN isolator, respectively. The CAN-H and CAN-L pins of the CAN transceiver are also connected to the CAN-L and CAN-H pins of the CAN-to-fiber optic isolator, respectively.

[0010] The CAN-L and CAN-H pins of the CAN isolator are used to connect to the CAN bus network under test; the optical channel of the CAN-to-fiber isolator is used to connect to the fiber optic network under test.

[0011] The power module is connected to the CAN controller, CAN transceiver, CAN isolator, and CAN-to-fiber optic isolator. The power module output voltage is 5V.

[0012] Furthermore, the CAN controller supports baud rates of 20kbps and 125kbps.

[0013] Furthermore, the CAN-L and CAN-H pins of the CAN isolator are connected to the fiber optic network under test via a terminal block.

[0014] Furthermore, the CAN controller uses the STM32F407VET6 as the main control chip, which comes with a built-in bxCAN controller.

[0015] Furthermore, the CAN transceiver uses the TJA1050 transceiver.

[0016] Furthermore, it also includes a display, the FSMC interface of which is connected to the FSMC interface of the CAN controller.

[0017] Furthermore, the power module includes a DC-DC converter and a lithium battery.

[0018] This utility model has the following advantages compared with the prior art:

[0019] This invention uses a CAN controller to send test signals to a CAN transceiver. The CAN transceiver converts the test signals into differential signals. A CAN isolator forwards these differential signals to the CAN bus network under test. A CAN-to-fiber isolator converts the differential signals into optical signals to complete the testing of the fiber optic network under test. By using a CAN-to-fiber isolator to connect the fiber optic network under test to the test line of the CAN bus, not only is fiber optic testing achieved, but the utilization rate of the CAN controller is also improved. Compared to directly adding a separate fiber optic network testing device, this system has lower costs and a smaller size. It solves the problem that existing testing devices cannot adapt to communication environments where fiber optics and CAN buses coexist, and simultaneously improves the communication testing efficiency of coal mining machines.

[0020] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a circuit block diagram of an embodiment of the portable CAN fiber optic dual-channel communication test system of this utility model. Detailed Implementation

[0022] Example of a portable CAN fiber optic dual-channel communication test system:

[0023] like Figure 1 As shown, a portable CAN fiber optic dual-channel communication test system includes a CAN controller, a CAN transceiver, a CAN isolator, a CAN-to-fiber optic isolator, and a power module.

[0024] The CAN controller is used to send and receive test signals. The status of the communication network is determined by comparing the sent and received test signals. The PA and PB pins of the CAN controller are connected to the TXD and RXD pins of the CAN transceiver, respectively, for transmitting test signals. To accommodate the operating status of the coal mining machine, the CAN controller supports baud rates of 20kbps and 125kbps.

[0025] To ensure test performance, the CAN controller uses an STM32F407VET6 as the main control chip, which has a built-in bxCAN controller. The main control chip outputs test signals to the bxCAN controller, which is responsible for packaging and sending the test signals to the CAN transceiver, ensuring reliable transmission and reception of the test signals. Figure 1 The PC and GND pins are used to switch the baud rate.

[0026] To enable the connection between the CAN controller and the network under test, a CAN transceiver is used for the conversion between digital and differential signals. The CAN transceiver used is the TJA1050, which supports communication rates up to 1 Mbps, meeting the needs of high-speed data transmission. The TJA1050 also supports low-power mode and sleep mode, helping to optimize system power consumption.

[0027] To achieve electrical isolation between the CAN controller and the network under test, the CAN-H and CAN-L pins of the CAN transceiver are connected to the CAN-H and CAN-L pins of the CAN isolator, respectively. The CAN-H and CAN-L pins of the CAN transceiver are also connected to the CAN-L and CAN-H pins of the CAN-to-fiber optic isolator, respectively. This serves multiple purposes, including protection, interference suppression, and signal integrity. Additionally, the CAN-to-fiber optic isolator converts differential signals into optical signals, enabling testing of the fiber optic network under test. The CAN-H and CAN-L pins of the CAN transceiver each have two signal lines leading out for connection to the CAN-to-fiber optic isolator and the CAN isolator, respectively.

[0028] The CAN-L and CAN-H pins of the CAN isolator are used to connect to the CAN bus network under test; the optical channel of the CAN-to-fiber isolator is used to connect to the fiber optic network under test.

[0029] To improve the utilization rate of the power module, the power module is connected to the CAN controller, CAN transceiver, CAN isolator, and CAN to fiber optic isolator. The power module output voltage is 5V.

[0030] To facilitate connection to the network under test, the CAN-L and CAN-H pins of the CAN isolator are connected to the fiber optic network under test via a terminal block. This terminal block is... Figure 1 X1 in the diagram is specifically connected via terminals 5 and 6.

[0031] The power module here achieves electrical connection with various components through terminals 3 and 4 of the terminal block.

[0032] To allow testers to easily view the test results, a display is included. The display's FSMC interface connects to the FSMC interface of the CAN controller. Any display with an FSMC interface is sufficient; displays of different sizes can be selected based on requirements.

[0033] Since the power supply lithium battery is not a 5V power source, the power module includes a DC-DC converter and a lithium battery. The DC-DC converter converts the power supply to the voltage required by each component. To save energy, the power module also incorporates a power switch in the power supply circuit, allowing for easy disconnection of the power supply when not in use.

[0034] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A portable CAN fiber optic dual-channel communication testing system, characterized in that: It includes a CAN controller, CAN transceiver, CAN isolator, CAN-to-fiber optic isolator, and power module; The CAN controller is used to send and receive test signals. The PA and PB pins of the CAN controller are connected to the TXD and RXD pins of the CAN transceiver, respectively, for transmitting test signals. The CAN transceiver is used for the conversion between digital signals and differential signals. The CAN-H and CAN-L pins of the CAN transceiver are connected to the CANF-L and CANF-H pins of the CAN isolator, respectively. The CAN-H and CAN-L pins of the CAN transceiver are also connected to the CAN-L and CAN-H pins of the CAN-to-fiber optic isolator, respectively. The CAN-L and CAN-H pins of the CAN isolator are used to connect to the CAN bus network under test; the optical channel of the CAN-to-fiber isolator is used to connect to the fiber optic network under test. The power module is connected to the CAN controller, CAN transceiver, CAN isolator, and CAN-to-fiber optic isolator. The power module output voltage is 5V.

2. A portable CAN fiber optic dual channel communication test system according to claim 1, characterized in that: The CAN controller supports baud rates of 20kbps and 125kbps.

3. The portable CAN fiber optic dual channel communication test system according to claim 1, wherein: The CAN-L and CAN-H pins of the CAN isolator are connected to the fiber optic network under test via a terminal block.

4. The portable CAN fiber optic dual channel communication test system according to claim 1, wherein: The CAN controller uses an STM32F407VET6 as the main control chip, which has a built-in bxCAN controller.

5. The portable CAN fiber optic dual channel communication test system according to claim 1, wherein: The CAN transceiver used is the TJA1050 transceiver.

6. A portable CAN fiber optic dual channel communication test system according to any one of claims 1-5, characterized in that: It also includes a display, whose FSMC interface is connected to the FSMC interface of the CAN controller.

7. A portable CAN fiber optic dual channel communication test system according to any one of claims 1-5, characterized in that: The power module includes an adjustable DC-DC converter and a lithium battery.

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