An interface unit for railway onboard wireless communication equipment

Abstract

The utility model discloses an interface unit applied to railway vehicle-mounted wireless communication equipment, including a data port and a main control extension board, wherein the data port is connected to a level conversion module through an RS422 data transmission protocol, wherein the level conversion converts the level of a signal received by the data port, so that signal transmission between different data ports is compatible, wherein the signal after the level conversion is connected to an interface through a serial port, wherein the interface is connected to another level conversion for level conversion again, and wherein the converted signal is connected to a different interface through an RS422 data transmission protocol for signal output. The interface unit applied to railway vehicle-mounted wireless communication equipment, wherein the interface unit in the device adopts 74LVTH245 as an interface driver, uses an FPGA chip to realize the expansion of various interfaces and the underlying protocol processing, and can realize 5-way asynchronous serial port and 2-way FSK encoding and decoding functions under the command of an MCU.

Description

Technical Field

[0001] The utility model relates to the technical field of mobile communications, in particular to an interface unit applied to railway vehicle-mounted wireless communication equipment. Background Art

[0002] Mobile communication refers to the communication between mobile objects, or between mobile objects and fixed objects. Mobile objects can be people, cars, trains, ships, radios and other objects in motion. The interface unit belongs to the field of mobile communication technology. It is used in locomotive integrated wireless communication equipment (hereinafter referred to as CIR). It is a device that performs level conversion and digital-to-analog conversion on the CIR main control interface, main control extension interface, maintenance interface, power supply system, data storage system, voice processing, voice level automatic control and other parts, so as to realize the interactive exchange of voice information and data information inside and outside the CIR equipment.

[0003] The current railway onboard wireless communication equipment interface unit cannot quickly perform level conversion, digital-to-analog conversion and other processes for a large number of signals input simultaneously, so the CIR equipment has insufficient response speed. Utility Model Content

[0004] The purpose of the utility model is to provide an interface unit for railway on-board wireless communication equipment. The device is provided with multiple RS422 level conversion modules to process a large number of signal machines input into the equipment interface unit, thereby improving the transmission speed of the signal to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an interface unit applied to railway vehicle-mounted wireless communication equipment, comprising a data port and a main control extension board, wherein the data port is connected to a level conversion module via an RS422 data transmission protocol, wherein the level conversion converts the level of a signal received by the data port so that signal transmission between different data ports is compatible, wherein the signal after the level conversion is connected to an interface via a serial port, wherein the interface is connected to another level conversion for level conversion again, and wherein the converted signal is connected to a different interface via an RS422 data transmission protocol for signal output.

[0006] Preferably, the digital-to-analog conversion process of the received signal and the transmitted signal in the data port is as follows: the main control extension board transmits the audio signal to the audio amplifier circuit for amplification, the audio amplifier circuit is connected to the electronic switch, the electronic switch is connected to the level adjustment potentiometer, and the level adjustment potentiometer converts the level of the audio signal and outputs it through the interface.

[0007] By adopting the above technical solution, the audio amplifier circuit is first used to transmit the signal, and then the level adjustment potentiometer is used to convert the digital-to-analog conversion of the received signal and the sent signal in the data port.

[0008] Preferably, another digital-to-analog conversion process of the received signal and the transmitted signal in the data port is as follows: the interface receives an audio signal, the interface transmits the signal to a level adjustment potentiometer for level conversion, the interface is connected to an audio amplifier circuit to amplify the signal, the audio amplifier circuit is connected to an electronic switch, and the electronic switch is connected to the interface to output the signal.

[0009] By adopting the above technical solution, the input signal is firstly level-adjusted by using a level-adjusting potentiometer, and then the audio amplifier circuit is used to perform digital-to-analog conversion on the received signal and the transmitted signal in the data port.

[0010] Preferably, during the audio signal reception and transmission process, the signal is transmitted from the interface to the shift register for temporary storage of the data, the signal temporarily stored in the shift register is input to a working status indicator light to indicate the circuit working status, and the signal in the shift register is connected to an electronic switch to access the data transmission circuit. Similarly in another case, the interface transmits the signal to the shift register for temporary storage, and the shift register is connected to the electronic switch to access the signal to the data transmission circuit.

[0011] By adopting the above technical solution, the data can be temporarily stored using a shift register during the transmission of the audio signal.

[0012] Preferably, the signal is input through another interface after passing through an analog switch from a recording unit, a TAX box, an operation terminal, and an interface input circuit. The signal is input through the analog switch into the FPGA. The FPGA implements interface expansion and underlying protocol processing. The signal processed by the FPGA is connected to the MCU, and 5-channel asynchronous serial ports and 2-channel FSK encoding and decoding functions are implemented under the command of the MCU. The signal processed by the FPGA is connected to the FLASH to realize temporary storage of signal data. The MCU transmits the signal to the maintenance test port and the WDT to provide feedback on the signal.

[0013] By adopting the above technical solution, FPGA is used to expand the signal input by the interface unit and process the underlying protocol, and to provide feedback on the signal.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the interface unit applied to railway vehicle-mounted wireless communication equipment:

[0015] 1. The interface unit in this device uses 74LVTH245 as the interface driver, and uses FPGA chip to realize the expansion of various interfaces and the underlying protocol processing. Under the command of MCU, it can realize 5-channel asynchronous serial port and 2-channel FSK encoding and decoding functions;

[0016] 2. This device uses analog switches and filter components to ensure that the information from the recording unit, TAX box, operation terminal, and 450M analog communication unit completes level conversion and digital-to-analog conversion in the FPGA;

[0017] 3. The communication data interface of this device adopts an asynchronous serial communication interface, a duplex communication mode, RS422 level conversion, and a data transmission rate of 9600bit / s, so that the data transmission and level conversion of the interface can respond quickly to the input signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the conversion between the serial port and the RS422 interface of the utility model;

[0019] Figure 2 This is a schematic diagram of the simulation circuit of the utility model;

[0020] Figure 3 This is a schematic diagram of information conversion of the communication unit of the utility model;

[0021] In the figure: 1. Data port; 2. Level conversion; 3. Interface; 4. Main control extension board; 5. Audio amplifier circuit; 6. Level adjustment potentiometer; 7. Electronic switch; 8. Shift register; 9. Working status indicator light; 10. Maintenance test port; 11. WDT; 12. MCU; 13. FPGA; 14. FLASH; 15. Analog switch. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-3 The utility model provides a technical solution: an interface unit applied to railway vehicle-mounted wireless communication equipment, including a data port 1, a level conversion 2, an interface 3, a main control extension board 4, an audio amplifier circuit 5, a level adjustment potentiometer 6, an electronic switch 7, a shift register 8, a working status indicator light 9, a maintenance test port 10, a WDT 11, an MCU 12, an FPGA 13, a FLASH 14, and an analog switch 15.

[0024] The device has the effect of quickly processing and feeding back the input data, specifically:

[0025] Data port 1 is connected to level conversion module 2 through RS422 data transmission protocol. Level conversion module 2 converts the level of the signal received by data port 1, so that the signal transmission between different data ports 1 is compatible. The converted signal of level conversion module 2 is connected to interface 3 through serial port. Interface 3 is connected to another level conversion module 2 for level conversion again. The converted signal is connected to different interface 3 through RS422 data transmission protocol for signal output. The digital-to-analog conversion process of the received signal and the transmitted signal in data port 1 is as follows. The main control extension board 4 transmits the audio signal to the audio amplifier circuit 5 for amplification. The audio amplifier circuit 5 is connected to the electronic switch 7. The electronic switch 7 is connected to the level adjustment potentiometer 6. The level adjustment potentiometer 6 converts the level of the audio signal and outputs it through interface 3. Another digital-to-analog conversion process of the received signal and the transmitted signal in data port 1 is as follows. Interface 3 receives the audio signal. Interface 3 transmits the signal to the level adjustment potentiometer 6 for level conversion. Interface 3 is connected to the audio amplifier circuit 5 to amplify the signal. The audio amplifier circuit 5 is connected to the electronic switch 7. The electronic switch The switch 7 is connected to the interface 3 to output the signal. During the audio signal reception and transmission process, the signal is transmitted from the interface 3 to the shift register 8 for temporary storage of data. The signal temporarily stored in the shift register 8 is input to the working status indicator light 9 to indicate the circuit working status, and the signal in the shift register 8 is connected to the electronic switch 7 to access the data transmission circuit. Similarly, in another case, the interface 3 transmits the signal to the shift register 8 for temporary storage, and the shift register 8 is connected to the electronic switch 7 to access the data transmission circuit. The signal is input from the recording unit, TAX box, operation terminal, and interface 3 input circuit through the analog switch 15 and then through another interface 3. The signal is input from the analog switch 15 to FPGA13, and FPGA13 implements interface expansion and bottom layer protocol processing. The signal processed by FPGA13 is connected to MCU12, and 5-way asynchronous serial port and 2-way FSK encoding and decoding functions are realized under the command of MCU12. The signal processed by FPGA13 is connected to FLASH14 to realize temporary storage of signal data. MCU12 transmits the signal to the maintenance test port 10 and WDT11 to feedback the signal.

[0026] like Figure 1-Figure 3As shown, the signal of the input device of data port 1 is transmitted to the level converter 2 through the RS422 data transmission protocol, and the level is converted. After multiple conversions and transmissions, it is output through the interface 3. The digital-to-analog conversion process of the received signal and the sent signal is as follows. The audio signal is transmitted to the audio amplifier circuit 5 for amplification. The level adjustment potentiometer 6 converts the audio signal level and outputs it through the interface 3, and the shift register 8 is set to temporarily store the data. The digital-to-analog conversion process of the interface unit is as follows. The signal is input through another interface 3 after passing through the analog switch 15 from the input circuits such as the recording unit, TAX box, operation terminal, and interface 3. The signal is input from the analog switch 15 to FPGA13. FPGA13 implements the expansion of various interfaces and the underlying protocol processing. The signal processed by FPGA13 is connected to MCU12, and under the command of MCU12, 5 asynchronous serial ports and 2 FSK encoding and decoding functions are realized. The signal processed by FPGA13 is connected to FLASH14 to realize the temporary storage of signal data. MCU12 transmits the signal to the maintenance test port 10 and WDT11 to feedback the signal.

[0027] Working principle: When using the interface unit applied to railway onboard wireless communication equipment, the interface unit of this device adopts 74LVTH245 as the driver, uses FPGA13 chip to realize the expansion of various interfaces 3 and the underlying protocol processing, and can realize 5-way asynchronous serial port and 2-way FSK encoding and decoding functions under the command of MCU12. Use analog switch 15 and filter components to ensure that the information from the recording unit, TAX box, operation terminal, and 450M analog communication unit completes the level conversion and digital-to-analog conversion in FPGA13, which increases the overall practicality.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An interface unit for railway onboard wireless communication equipment, comprising a data port (1) and a main control extension board (4), characterized in that: The data port (1) is connected to a level conversion (2) module via an RS422 data transmission protocol; the level conversion (2) converts the level of a signal received by the data port (1) so that signal transmission between different data ports (1) is compatible; the signal converted by the level conversion (2) is connected to an interface (3) via a serial port; the interface (3) is connected to another level conversion (2) for another level conversion; the converted signal is connected to a different interface (3) via an RS422 data transmission protocol for signal output.

2. The interface unit for railway vehicle-mounted wireless communication equipment according to claim 1, characterized in that: The digital-to-analog conversion process of the received signal and the transmitted signal in the data port (1) is as follows: the main control extension board (4) transmits the audio signal to the audio amplifier circuit (5) for amplification; the audio amplifier circuit (5) is connected to the electronic switch (7); the electronic switch (7) is connected to the level adjustment potentiometer (6); the level adjustment potentiometer (6) converts the level of the audio signal and outputs it through the interface (3).

3. The interface unit for railway vehicle-mounted wireless communication equipment according to claim 1, characterized in that: Another digital-to-analog conversion process of the received signal and the transmitted signal in the data port (1) is as follows: the interface (3) receives the audio signal, the interface (3) transmits the signal to the level adjustment potentiometer (6) for level conversion, the interface (3) is connected to the audio amplifier circuit (5) to amplify the signal, the audio amplifier circuit (5) is connected to the electronic switch (7), and the electronic switch (7) is connected to the interface (3) to output the signal.

4. The interface unit for railway vehicle-mounted wireless communication equipment according to claim 2, characterized in that: During the audio signal reception and transmission process, the signal is transmitted from the interface (3) to the shift register (8) for temporary data storage, the signal temporarily stored in the shift register (8) is input into the working status indicator light (9) to indicate the circuit working status, and the signal in the shift register (8) is connected to the electronic switch (7) to access the data transmission circuit. Similarly, in another case, the interface (3) transmits the signal to the shift register (8) for temporary storage, and the shift register (8) is connected to the electronic switch (7) to access the data transmission circuit.

5. The interface unit for railway vehicle-mounted wireless communication equipment according to claim 1, characterized in that: The signal is inputted through another interface (3) via an analog switch (15) after passing through a recording unit, a TAX box, an operation terminal, and an input circuit of an interface (3). The signal is inputted into an FPGA (13) via the analog switch (15). The FPGA (13) implements interface expansion and underlying protocol processing. The signal processed by the FPGA (13) is connected to an MCU (12), and under the command of the MCU (12), 5-channel asynchronous serial port and 2-channel FSK encoding and decoding functions are implemented. The signal processed by the FPGA (13) is connected to a FLASH (14) to implement temporary storage of signal data. The MCU (12) transmits the signal to a maintenance test port (10) and a WDT (11) to provide feedback on the signal.

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