Hand-held terminal for crossing station test and application method

Abstract

The invention discloses a handheld terminal for a crossing station test and an application method. The terminal comprises a Jian TK480 handheld station and a handheld terminal control panel. The handheld station is used for receiving and transmitting radio frequency signals, the control panel is responsible for sending and demodulating special test messages, and the control panel comprises a power supply circuit, an interface circuit, a processor circuit, a double-color LED display circuit, an FFSK signal processing circuit, a switching circuit, a level conversion circuit, a power amplifier circuit, a key circuit and an LCD display circuit. The hand-held terminal is in wireless communication with the crossing station, the approach early warning test message is sent by the hand-held terminal, and the crossing station receives and prompts the approach early warning test message; and the crossing alarm test message is sent by the crossing station, and is decoded and displayed after being received by the handheld terminal. The device effectively solves the problem of the approach early warning and alarm function test of the crossing platform, is convenient to carry, can carry out the test at any time, avoids the interference to a normal operation locomotive, and remarkably improves the test flexibility and safety.

Description

Technical Field

[0001] The present invention relates to the technical field of railway wireless communication, and in particular to a handheld terminal for crossing station testing and an application method thereof. Background Art

[0002] The level crossing stations, which are widely used in the current railway system, play an important role in daily operation and maintenance. However, due to the limitation of technical means, there are many difficulties in the regular testing of the level crossing station functions, especially the testing of the approach warning and level crossing alarm functions. For example, the testing of the level crossing alarm function usually needs to be arranged during the skylight period, that is, it is completed under the condition that all trains stop running. This test arrangement is not only subject to time constraints, but may also have an adverse impact on the overall operational efficiency of the railway.

[0003] In addition, in the current crossing alarm test, the test message and the alarm message sent during actual operation cannot be effectively distinguished. This means that the alarm information sent during the test may be received and interpreted by the running locomotive, which may easily cause misunderstandings to the train driver and even interfere with normal driving operations. This situation poses a certain hidden danger to the driving safety of the train and obviously cannot meet the actual needs.

[0004] Therefore, the existing level crossing station testing technology has obvious deficiencies in terms of test time flexibility and test process safety. A more efficient, convenient and safe testing method is needed to meet the actual needs of railway level crossing station function testing while avoiding interference with the normal operation of the locomotive. This is exactly the problem that the present invention attempts to solve. Summary of the invention

[0005] In view of the state of the prior art, the present invention provides a handheld terminal for testing a road crossing station, which can fundamentally solve the problem of testing the approach warning and road crossing alarm functions of the road crossing station. The technical solution adopted by the present invention is: a handheld terminal for testing a road crossing station, including a TK480 handheld station and a handheld terminal control board, the handheld terminal control board includes a power supply circuit, an interface circuit, a processor circuit, a two-color LED display circuit, an FFSK signal processing circuit, a switching circuit, a level conversion circuit, a power amplifier circuit, a key circuit and an LCD display circuit, the power supply circuit receives a 5V voltage from the interface circuit, and outputs a 3V3 voltage after level conversion, which is used to provide a stable working power supply for the processor circuit and other modules; the interface circuit is used for signal input and output and connection between devices, the AF audio signal is connected to the FFSK signal processing circuit for decoding the road crossing alarm information, the MIC-480 pin receives the MIC-DAC signal transmitted by the processor through the switching circuit, and is used to send the approach warning message; the FFSK signal processing circuit is responsible for modulating and demodulating the received FFSK signal, and is connected to the processor circuit through the AF-Collect pin for signal The signal decoding ensures the accurate processing of the test information; the two-color LED display circuit controls the working state of the channel machine through the LG and LR pins; the processor circuit is used for signal processing and instruction execution, and outputs the transmission state of the channel machine through the PTT-M pin to the PTT-MCU pin of the interface circuit through the level conversion circuit. The MCU-TXD1 and MCU-RXD1 pins are responsible for data communication with the interface circuit. The Ch-Ffsk_DF and Ch-Dfsk_S pins control the switching circuit through the level conversion circuit to complete the signal path selection and execute the signal transmission from the processor circuit to the interface circuit; the power amplifier circuit is used to amplify the audio signal of the processor circuit to drive the speaker to play the test prompt tone; the key circuit is used to identify the user's key input through logical judgment, and transmit the key information to the processor circuit to perform the corresponding operation; the LCD display circuit is used to connect the LCD screen, and send control signals through the processor circuit to display the test status and operation information, providing users with an intuitive interactive interface.

[0006] A method for applying a handheld terminal for testing a road crossing station, the method comprising a proximity warning function test and a road crossing alarm function test, wherein the process of the proximity warning function test is as follows: the handheld terminal is turned on, the user operates the keyboard and presses the "A" key, the processor LPC1765 detects a signal that the "A" key is pressed through a key circuit, the processor identifies the signal and confirms the key instruction; when the confirmation instruction is to send a proximity warning special test message, the LPC1765 starts the relevant process; the LPC1765 first generates a proximity warning special test message in a POCSAG format through its MIC-DAC signal output end; the generated message signal is transmitted to a switching unit through the MIC-DAC port; the switching unit transmits the signal to the MIC-480 pin of the interface socket XS4 according to the signal path requirement, and finally the signal is sent by a channel sending machine connected to the interface socket; the channel sending machine sends the proximity warning special test message to the road crossing station at a specific frequency; the road crossing station enters a corresponding test mode after receiving the signal, and completes the test of the proximity warning function; The process of the crossing alarm function test is as follows: the handheld terminal is turned on, and the Kenwood TK480 handheld station is responsible for receiving the radio frequency signal; the crossing station sends a special test message for crossing alarm through a specific frequency, and after the TK480 handheld station receives the signal, it transmits the FFSK signal to the AF audio pin of the interface socket XS4 through its internal radio frequency signal demodulation module; the interface socket sends the signal to the FFSK signal processing circuit for further processing; the FFSK signal processing circuit performs preliminary decoding on the signal, and inputs the decoded signal to the LPC1765 processor through the AF-DECODE pin; the LPC1765 processor completes the complete decoding of the FFSK signal through the AF-Collect pin, and when the decoding result shows that the received message is a special test message for crossing alarm, the processor triggers the prompt logic; the prompt logic displays "crossing alarm test information received" to the user through the LCD display circuit, and at the same time emits a prompt sound through the buzzer to confirm that the receiving operation is successful and the test function is completed.

[0007] The technical effects of the present invention are as follows: first, the handheld terminal of the present invention makes the arrangement of the test time more flexible, and there is no need to wait for the skylight point to open. The test can be carried out only when the crossing station is not in use, thereby improving the convenience and efficiency of the test.

[0008] Secondly, during the process of testing the crossing alarm function, the handheld terminal of the present invention sends a special test message so that the normally running locomotive platform cannot parse the message. Only the special handheld terminal provided by the present invention can parse these test messages, thereby effectively avoiding interference with the locomotive platform during the test process and further ensuring the safety of railway operation.

[0009] In summary, the present invention overcomes the time and safety limitations in the prior art by improving the testing method, and provides an efficient, safe and convenient solution for the functional testing of the crossing station, which has important practical value and promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a block diagram of the handheld terminal of the present invention; Figure 2 This is a block diagram of the handheld terminal control panel of the present invention; Figure 3 This is a power supply circuit diagram of the present invention; Figure 4 This is the interface circuit diagram of the present invention; Figure 5 A processor circuit of the present invention; Figure 6 Invented a dual-color LED display circuit diagram; Figure 7 FFSK signal processing circuit diagram of the present invention; Figure 8 Switching circuit diagram for the present invention; Fig. 9 It is a level conversion circuit diagram of the present invention; Fig.10 This is a flow chart of the approach warning of the present invention; Fig.11 It is a flow chart of the road crossing alarm of the present invention; Fig.12 It is a schematic diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0011] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0012] like Figure 1 As shown, a handheld terminal for crossing station testing includes a TK480 handheld station and a handheld terminal control board. The TK480 handheld station serves as a radio frequency receiving and transmitting terminal, and the control board is used for sending and demodulating special test messages.

[0013] Figure 2The block diagram of the handheld terminal control board of the present invention includes a power supply circuit, an interface circuit, a processor circuit, a two-color LED display circuit, an FFSK signal processing circuit, a switching circuit, a level conversion circuit, an amplifier circuit, a key circuit and an LCD display circuit. Among them, the power supply circuit receives a 5V voltage from the interface circuit, and outputs a 3V3 voltage after level conversion, providing a stable working power supply for the processor circuit and other modules; the interface circuit is a core module for signal input and output and device connection, wherein the 5V voltage is transmitted to the power supply circuit, the AF audio signal is connected to the FFSK signal processing circuit to decode the crossing alarm information, and the MIC-480 pin receives the MIC-DAC signal transmitted by the processor through the switching circuit for sending the approach warning message; the FFSK signal processing circuit is responsible for modulating and demodulating the received FFSK signal, and connecting the processor circuit through the AF-Collect pin to decode the signal to ensure accurate processing of the test information; the two-color LED display circuit controls the working state of the channel machine through the LG and LR pins, and when the LG pin is at a high level, the green light is lit to indicate that the channel machine is receiving the signal, and when the LR pin is at a high level, the red light is lit to indicate that the signal The channel machine is transmitting signals; the processor circuit is the core control unit of the handheld terminal, responsible for signal processing and instruction execution, and controls the transmission status of the channel machine through the PTT-M pin output to the PTT-MCU pin of the interface circuit through the level conversion circuit. The MCU-TXD1 and MCU-RXD1 pins are responsible for data communication with the interface circuit. The Ch-Ffsk_DF and Ch-Dfsk_S pins control the switching circuit through the level conversion circuit to complete the signal path selection, thereby realizing the signal transmission from the processor circuit to the interface circuit; the power amplifier circuit amplifies the audio signal of the processor circuit to drive the speaker to play the test prompt tone; the key circuit recognizes the user's key input through logical judgment, and transmits the key information to the processor circuit to perform the corresponding operation; the LCD display circuit is used to connect the LCD screen, and sends a control signal through the processor circuit to display the test status and operation information, thereby providing an intuitive interactive interface for users.

[0014] like Figure 3As shown, the power supply circuit of the present invention mainly includes a power supply conversion chip N2 of model LM1117-3.3V, which is used to convert 5V power supply to 3.3V. After the power supply chip converts, the 2nd pin of the power supply circuit N2 outputs +3.3V. The specific circuit connection of the power supply circuit is as follows: the 3rd pin of the chip N2 is respectively connected to one end of the capacitor C5, the capacitor C6 and the 5V power supply, the 2nd pin of the chip N2 is respectively connected to one end of the capacitor C7, the capacitor C8, the capacitor C2 and the inductor L1, and the other ends of the capacitors C5, C6, C7 and C8 are connected to the ground GND; the other end of the capacitor C2 is respectively connected to the other end of the inductor L2 and the ground GND; the other end of the inductor L1 is respectively connected to one end of the capacitor C3, the capacitor C4 and 3.3VA, and the other ends of the capacitors C3 and C4 are connected to the other end of the inductor L2 and the ground GND.

[0015] like Figure 4 As shown, the interface circuit of the present invention mainly includes a 24Ppin socket XS4, which serves as the interface of the channel machine. Pin 1 of XS4 is connected to the handheld station power supply ST-7.5V, and pin 2 is MIC-480, which is used as the pin for the control board signal to be input to the channel machine. Pin 8 PTT-MCU pin is the channel machine transmission control pin. When the PTT pin is at a low level, the channel machine transmits; wherein, pin 8 is respectively connected to the resistor R51 and pin 3 of the high-speed switch diode VD4, and pin 1 of the diode VD4 is connected to the level conversion circuit PTT-MCU. Pin 12 is the channel machine level output pin, connected to a 5V voltage. Pin 13 GND is the ground wire of the channel machine. Pin 14 is the Speaker-IN pin, which is used to output the microphone signal of the control board to the input end of the channel machine. The 18-pin TXD and 19-pin RXD pins are the TTL serial communication pins of the channel machine, which are used for communication between the control board and the channel machine, and can control the channel machine to switch channels; the 18-pin is connected to one end of the resistor R60, and the other end of the resistor R60 is connected to the 1-pin of the high-speed switching diode VD5, and the 3-pin of the diode VD5 is connected to the MCU-RXD1, and connected to 3.3V through the resistor R55; the 19-pin is connected to one end of the resistor R64, and the other end of the resistor R64 is connected to the MCU-TXD1_480. The 22-pin AF is used as the audio output pin of the channel machine, and the demodulated audio signal of the channel machine is sent to the control board through this pin. The 23-pin is grounded GND, and the 24-pin is Speaker_OUT, which is the audio input terminal of the speaker.

[0016] like Figure 5As shown, the processor circuit of the present invention mainly includes a microprocessor (MCU) chip N5 of model LPC1765, wherein the 8-pin AF-Collect of the chip N5 is used for signal decoding, the 6-pin MIC-DAC of the chip N5 is used for sending a proximity warning message, the 91-pin MSW-M is used for controlling the switching circuit after level conversion, the 92-pin Ch-Ffsk_DF and the 94-pin Ch-Dfsk_S are used for controlling the switching circuit through the level conversion circuit to complete signal path selection and perform signal transmission; the 90-pin PTT-M is used to control the transmission state of the channel machine, and the 75-pin MCU-TXD1 and the 74-pin MCU-RXD1 are used for data sending and receiving of the processor.

[0017] like Figure 6 As shown, the dual-color LED display circuit of the present invention includes a transistor VQ1, a transistor VQ2, a light-emitting diode VD1, a light-emitting diode VD2 and a resistor; when the LG of the 1-pin of the transistor VQ1 is high, the 3-pin and 2-pin of VQ1 are turned on, the 2-pin is at a high level, and the 1-pin of VD2 is at a high level, and VD2 is lit. When the LG of the 1-pin of the transistor VQ1 is low, the 3-pin and 2-pin of VQ1 are turned off, the 2-pin is at a low level, and the 1-pin of VD2 is at a low level, and VD2 is turned off. When the LR of the 1-pin of the transistor VQ2 is high, the 3-pin and 2-pin of VQ2 are turned on, the 2-pin is at a high level, and the 1-pin of VD1 is at a high level, and VD1 is lit. When the 1-pin LR of the transistor VQ2 is low, the 3-pin and 2-pin of VQ2 are cut off, and the 2-pin is at a low level. At this time, the 1-pin of VD1 is at a low level, and VD1 is off; the 1-pin LG of the transistor VQ1 is connected to the 5-pin of the interface circuit XS4, the 3-pin of VQ1 is connected to the pull-up resistor R31 and then to the handheld power supply ST-7.5V, the 2-pin of VQ1 is connected to the resistor R37 and then to the green light-emitting diode VD2; the 1-pin LR of VQ2 is connected to the 6-pin of the interface circuit XS4, the 3-pin of VQ2 is connected to the pull-up resistor R31 and then to the handheld power supply ST-7.5V, the 2-pin of VQ2 is connected to the resistor R38 and then to the red light-emitting diode VD1. The red LED lights up to indicate that the handheld station is in the transmitting state, and the green LED lights up to indicate that the handheld station is in the receiving state. The lighting control of the diode is controlled by the channel machine processor; the specific circuit is that ST-7.5V is connected to one end of the resistor R31, the other end of the resistor R31 is respectively connected to the 3 pins of the transistor VQ1 and the transistor VQ2, the 1 pin of the transistor VQ1 is connected to LG and one end of the capacitor C31, the 1 pin of the transistor VQ2 is connected to the resistor LR and one end of the capacitor C33, the 2 pins of the transistor VQ1 are respectively connected to one end of the resistor R37 and the other end of the capacitor C31, and the 2 pins of the transistor VQ2 are respectively connected to the resistor R38 and the other end of the capacitor C33; the other ends of the resistors R37 and R38 are respectively connected to the anodes of the light-emitting diodes VD1 and VD2, and the cathodes of the light-emitting diodes VD1 and VD2 are grounded together.

[0018] like Figure 7 As shown, the FFSK signal processing circuit of the present invention mainly includes an operational amplifier chip N10 of model NJM2904, which is used to amplify audio signals. Pin 2 of N10A is used as the input pin of the negative feedback amplifier circuit, and pin 1 of N10A is used as the output pin of the negative feedback amplifier circuit, wherein the amplification factor is configured by resistors R68 and R61, and pin 10 of N10A is used as a half-voltage reference point of 2.5V; the specific circuit connection is: one end of resistor R57 is connected to 5V, one end of resistor R65 is connected to ground GND, the other end of resistor R59 is connected to one end of capacitor C51 and pin 3 of chip N10, and the other end of capacitor C51 is connected to pin 4 of chip N10 and ground GND, pin 2 of chip N10 is connected to resistor R61, one end of base capacitor C56 of resistor R68 respectively, resistor R61 is connected to AF end of interface circuit XS4 through capacitor C34, the other end of resistor R68 and capacitor C56 are connected to pin 1 of chip N10 and one end of capacitor C52 respectively, the other end of capacitor C52 is connected to resistor R56, one end of resistor R63 and AF-Collect respectively, the other end of resistor R56 is connected to 3.3V, and the other end of resistor R63 is grounded GND.

[0019] like Figure 8As shown, the switching circuit of the present invention mainly includes a relay chip N9 of model 74HCT4053PW, wherein N9A, N9B, and N9C are three switch paths of the relay, and the 11th pin of N9A is used as a control terminal, which is used to control the 14th pin of N9A to be connected to the 12th pin of N9A or to be connected to the 13th pin of N9A for switching. Specifically, when the 11th pin of N9A is at a high level, the 14th pin of N9A is connected to the 12th pin of N9A, and when the 11th pin of N9A is at a low level, the 14th pin of N9A is connected to the 13th pin of N9A; the 10th pin of N9B is used as a control terminal, which is used to control the 15th pin of N9B to be connected to the 2nd pin of N9B or to be connected to the 1st pin of N9B; the 9th pin of N9C is used as a control terminal, which is used to control the 4th pin of N9C to be connected to the 5th pin of N9C or to be connected to the 4th pin of N9C; the specific circuit is: the 11th pin of the relay chip N9 is connected to the MSW-MCU of the level conversion circuit, and Connect to 5V through resistor R33, pin 14 of relay chip N9 is connected to MIC-480 of interface circuit, pin 16 of relay chip N9 is connected to 5V and one end of capacitor C38, pin 6, pin 7, pin 8 of relay chip N9 and the other end of capacitor C38 are grounded, pin 13 of relay chip N9 is connected to pin 15 of relay chip N9, pin 10 of relay chip N9 is connected to Choose-FSK_DF of level conversion circuit and one end of resistor R30, the other end of resistor R30 is grounded GND, pin 1 of relay chip N9 is connected to one end of resistor R39 and resistor R40 respectively, the other end of resistor R39 is connected to pin 5 of relay chip N9, the other end of resistor R40 is grounded, pin 4 of relay chip N9 is connected to MIC-DAC of processor circuit, pin 9 of relay chip N9 is connected to Ch-DFSK_SP of level conversion circuit, and connected to 5V through resistor R41.

[0020] like Fig. 9 As shown, the level conversion circuit of the present invention mainly includes a bus transceiver chip N1 of model 74HCT245, which is used to complete the level conversion, wherein the 20th pin of N1 is a power supply pin, the connection voltage is 5V, and the 1st pin of N1 is the ground GND of the chip. The 2nd pin MCU-TXD1_480 of the chip N1 and the 18th pin MCU-TXD1 of the chip N1 are a group of level conversion signals, wherein the 2nd pin MCU-TXD1_480 is a 5V voltage, and the 18th pin MCU-TXD1 is a 3.3V voltage. The 3rd pin PTT-MCU of N1 and the 17th pin PTT-M of N1 are another group of level conversion signals, wherein the 3rd pin PTT-MCU is a 5V voltage, and the 17th pin PTT-M is a 3.3V voltage.

[0021] The function of sending the approach warning information of the present invention is completed by the switching circuit, the FFSK signal processing circuit, the interface circuit and the processor circuit. Among them, the MSW-M pin of the processor circuit is converted to the MSW-MCU pin after passing through the level conversion circuit, and controls the 11th pin of the N9A of the switching circuit, so that the 14th pin is connected to the 13th pin; the Ch-Ffsk_DF pin of the processor circuit is converted to Choose-FFSK_DF after passing through the level conversion circuit, and controls the 10th pin of the switching circuit N9B, so that the 15th pin is connected to the 1st pin; the Ch-Dfsk_S pin of the processor circuit is converted to the Ch-DFSK_SP pin after passing through the level conversion circuit, and controls the 9th pin of the switching circuit N9C, so that the 4th pin is connected to the 3rd pin. The 6th pin MIC-DAC of the processor circuit chip N5 is connected to the 4th pin of the switching circuit N9, thereby completing the signal transmission process from the processor circuit to the interface circuit.

[0022] The function of receiving the crossing alarm information of the present invention is completed by the interface circuit, the FFSK signal processing circuit and the processor circuit. The interface circuit 22 pin AF is connected to C54 of the FFSK signal processing circuit, and then connected to the 2 pin of N10ANJM2904 through the resistor R61, and after being processed by the operational amplifier N10A, it passes through the capacitor C52 and is connected to the 8 pin AF-collect of the processor N5. The above circuits constitute the receiving circuit of the crossing alarm information and complete the work of data receiving and processing.

[0023] like Fig.10 As shown, the application method of the handheld terminal for the test of the road crossing station of the present invention is used, wherein the process of the approach warning function test of the present invention is: the handheld terminal is turned on, the user operates the keyboard, presses the "A" key, the processor LPC1765 detects the signal that the "A" key is pressed through the key circuit, and the processor identifies the signal and confirms the key instruction. When the confirmation instruction is to send a special test message for approach warning, LPC1765 starts the relevant process. LPC1765 first generates a special test message for approach warning in POCSAG format through its MIC-DAC signal output end. The generated message signal is transmitted to the switching unit through the MIC-DAC port. The switching unit transmits the signal to the MIC-480 pin of the interface socket XS4 according to the signal path requirements, and finally the signal is sent by the channel sending machine connected to the interface socket. The channel machine sends the special test message for approach warning to the road crossing station according to a specific frequency (such as 821.2375MHz). After receiving the signal, the road crossing station enters the corresponding test mode to complete the test of the approach warning function.

[0024] like Fig.11As shown, the process of the crossing alarm function test of the present invention is: the handheld terminal is turned on, and the Kenwood TK480 handheld station is responsible for receiving the radio frequency signal. The crossing station sends a special test message for the crossing alarm through a specific frequency (such as 866.2375MHz). After the TK480 handheld station receives the signal, it transmits the FFSK signal to the AF audio pin of the interface socket XS4 through its internal radio frequency signal demodulation module. The interface socket sends the signal to the FFSK signal processing circuit for further processing. The FFSK signal processing circuit performs preliminary decoding on the signal, and inputs the decoded signal into the LPC1765 processor through the AF-Collect pin; The LPC1765 processor completes the decoding of the FFSK signal through the AF-Collect pin. When the decoding result shows that the received message is a special test message for the crossing alarm, the processor triggers the prompt logic. The prompt logic displays "crossing alarm test information received" to the user through the LCD display circuit, and at the same time, a prompt tone is issued through the buzzer to confirm that the receiving operation is successful and the test function is completed.

[0025] The overall working principle and functions of the present invention are as follows: The principle of sending the crossing alarm function: The handheld terminal triggers the generation and sending process of the approach warning special test message by operating the button. Controlled by the LPC1765 processor, the generated message is finally transmitted to the channel machine through the switching circuit and the interface circuit. The channel machine transmits the test signal to the crossing station at a specific frequency to simulate the approach warning scenario and verify the response capability of the crossing station.

[0026] Receiving principle of approach warning function: After the special test message of crossing alarm sent by the crossing station is received by the handheld station, it is transmitted to the FFSK signal processing unit through the interface circuit to complete the signal decoding. The LPC1765 processor parses the decoded data and confirms the information type, notifies the user through display and prompt sound, and completes the test process.

[0027] Through the above process, the handheld terminal of the present invention realizes a comprehensive test of the crossing alarm and approach warning functions, while avoiding interference with the normal operation of the locomotive, improving the test efficiency and safety, and having significant practical value.

[0028] Embodiment 1, as Fig.12 As shown, the application of the handheld terminal of the present invention involves a device including a crossing station and a handheld terminal, wherein the handheld terminal is used as a test tool for the crossing alarm and approach warning functions of the crossing station. The crossing alarm function test is that the crossing station sends a special test message for crossing alarm at a frequency of 866.2375MHz, which is received and decoded by the handheld terminal; the approach warning function test is that the handheld terminal sends a special test message for approach warning at a frequency of 821.2375MHz, which is received, decoded and displayed by the crossing station.

[0029] The present invention utilizes a handheld terminal to solve the problem of testing the crossing alarm and approach warning functions of the crossing station, fundamentally changes the test mechanism, uses special test messages for the crossing alarm and approach warning, achieves no influence on the working state, and greatly reduces the impact on driving.

Claims

1. A handheld terminal for testing a road crossing station, comprising a TK480 handheld station and a handheld terminal control panel, characterized in that: The handheld terminal control board includes a power supply circuit, an interface circuit, a processor circuit, a two-color LED display circuit, an FFSK signal processing circuit, a switching circuit, a level conversion circuit, an amplifier circuit, a button circuit and an LCD display circuit. The power supply circuit receives a 5V voltage from the interface circuit, and outputs a 3V3 voltage after level conversion, which is used to provide a stable working power supply for the processor circuit and other modules; the interface circuit is used for signal input and output and device connection, the AF audio signal is connected to the FFSK signal processing circuit for decoding the crossing alarm information, and the MIC-480 pin receives the MIC-DAC signal transmitted by the processor through the switching circuit, which is used to send a proximity warning message; the FFSK signal processing circuit is responsible for modulating and demodulating the received FFSK signal, and connecting the processor circuit through the AF-Collect pin for signal decoding to ensure accurate processing of the test information; the two-color LED display The circuit controls the working state of the channel machine through the LG and LR pins; the processor circuit is used for signal processing and instruction execution, and outputs the transmission state of the channel machine through the PTT-M pin to the PTT-MCU pin of the interface circuit through the level conversion circuit. The MCU-TXD1 and MCU-RXD1 pins are responsible for data communication with the interface circuit. The Ch-Ffsk_DF and Ch-Dfsk_S pins control the switching circuit through the level conversion circuit to complete the signal path selection and execute the signal transmission from the processor circuit to the interface circuit; the power amplifier circuit is used to amplify the audio signal of the processor circuit to drive the speaker to play the test prompt tone; the key circuit is used to identify the user's key input through logical judgment, and transmit the key information to the processor circuit to perform the corresponding operation; the LCD display circuit is used to connect the LCD screen, and send the control signal through the processor circuit to display the test status and operation information, providing the user with an intuitive interactive interface.

2. The handheld terminal for the road crossing station test as claimed in claim 1, characterized in that: The specific circuit connection of the power supply circuit is as follows: pin 3 of chip N2 is respectively connected to one end of capacitor C5, capacitor C6 and a 5V power supply, pin 2 of chip N2 is respectively connected to one end of capacitor C7, capacitor C8, capacitor C2 and inductor L1, and the other ends of capacitors C5, capacitor C6, capacitor C7 and capacitor C8 are connected to ground GND; the other end of capacitor C2 is respectively connected to the other end of inductor L2 and ground GND; the other end of inductor L1 is respectively connected to one end of capacitor C3, capacitor C4 and 3.3VA, and the other ends of capacitor C3 and capacitor C4 are connected to the other end of inductor L2 and ground GND.

3. The handheld terminal for the road crossing station test as claimed in claim 1, characterized in that: The interface circuit includes a 24-pin socket XS4 connected to the channel machine, wherein pin 1 of XS4 is connected to the handheld station power supply ST-7.5V, pin 2 of XS4 is MIC-480, and the control board signal inputs the channel machine; pins 4 and 5 are respectively connected to the LED control pins LG and LR, and pin 8 is the PTT-MCU transmission control pin, which controls the channel machine to transmit when the level is low after level conversion; pin 12 provides 5V voltage output, and pins 13 and 23 are GND ground wires; pin 14 is the Speaker-IN pin, which is used to output the microphone signal to the channel machine; pin 18 TXD and pin 19 RXD are the sending and receiving pins of TTL serial communication respectively, which are connected to the processor MCU-RXD1 and MCU-TXD1_480; pin 22 is the AF audio output pin, which is used to send the audio signal demodulated by the channel machine to the control board; pin 24 is the Speaker_OUT pin, which is used for speaker audio input.

4. The handheld terminal for crossing station testing according to claim 1, characterized in that: The processor circuit includes a microprocessor chip N5 of model LPC1765, wherein the 8-pin AF-Collect of the chip N5 is used for signal decoding, the 6-pin MIC-DAC is used for sending a proximity warning message, the 91-pin MSW-M is used for controlling a switching circuit after level conversion, the 92-pin Ch-Ffsk_DF and the 94-pin Ch-Dfsk_S are used for controlling the switching circuit through a level conversion circuit to complete signal path selection and perform signal transmission, the 90-pin PTT-M is used for controlling the transmission state of the channel machine, and the 75-pin MCU-TXD1 and the 74-pin MCU-RXD1 are used for data sending and receiving of the processor.

5. The handheld terminal for the road crossing station test as claimed in claim 1, characterized in that: The specific circuit of the two-color LED display circuit is as follows: ST-7.5V is connected to one end of the resistor R31, the other end of the resistor R31 is respectively connected to the 3 pins of the transistor VQ1 and the transistor VQ2, the 1 pin of the transistor VQ1 is connected to the interface circuit LG and one end of the capacitor C31, the 1 pin of the transistor VQ2 is connected to the interface circuit LR and one end of the capacitor C33, the 2 pins of the transistor VQ1 are respectively connected to one end of the resistor R37 and the other end of the capacitor C31, the 2 pins of the transistor VQ2 are respectively connected to the resistor R38 and the other end of the capacitor C33; the other ends of the resistors R37 and R38 are respectively connected to the anodes of the light-emitting diodes VD1 and VD2, and the cathodes of the light-emitting diodes VD1 and VD2 are grounded together.

6. The handheld terminal for the road crossing station test as claimed in claim 1, characterized in that: The FFSK signal processing circuit includes an operational amplifier chip N10, and the specific circuit connection is: one end of the resistor R57 is connected to 5V, one end of the resistor R65 is grounded GND, the other end of the resistor R59 is connected to one end of the capacitor C51 and pin 3 of the chip N10, the other end of the capacitor C51 is connected to pin 4 of the chip N10 and ground GND, pin 2 of the chip N10 is respectively connected to the resistor R61, the resistor R68 and one end of the base capacitor C56, the resistor R61 is connected to the AF end of the interface circuit XS4 through the capacitor C34, the other ends of the resistor R68 and the capacitor C56 are respectively connected to pin 1 of the chip N10 and one end of the capacitor C52, the other end of the capacitor C52 is respectively connected to one end of the resistor R56, the resistor R63 and AF-Collect, the other end of the resistor R56 is connected to 3.3V, and the other end of the resistor R63 is grounded GND.

7. The handheld terminal for the road crossing station test as claimed in claim 1, characterized in that: The switching circuit includes a relay chip N9, which is composed of three switch paths N9A, N9B, and N9C. The specific circuit is: the 11th pin of the relay chip N9 is connected to the MSW-MCU of the level conversion circuit, and is connected to 5V through a resistor R33, the 14th pin of the relay chip N9 is connected to the MIC-480 of the interface circuit, the 16th pin of the relay chip N9 is connected to 5V and one end of the capacitor C38, the 6th pin, the 7th pin, the 8th pin of the relay chip N9 and the other end of the capacitor C38 are grounded, and the 13th pin of the relay chip N9 is connected to the 15th pin of the relay chip N9. , Pin 10 of relay chip N9 is connected to Choose-FSK_DF of level conversion circuit and one end of resistor R30, the other end of resistor R30 is grounded GND, Pin 1 of relay chip N9 is connected to one end of resistor R39 and resistor R40 respectively, the other end of resistor R39 is connected to Pin 5 of relay chip N9, the other end of resistor R40 is grounded, Pin 4 of relay chip N9 is connected to MIC-DAC of processor circuit, Pin 9 of relay chip N9 is connected to Ch-DFSK_SP of level conversion circuit, and connected to 5V through resistor R41.

8. The handheld terminal for the crossing station test as claimed in claim 7, characterized in that: The level conversion circuit includes a bus transceiver chip N1, which is used to complete the level conversion, wherein the 20th pin of the chip N1 is a power supply pin with a connection voltage of 5V, the 1st pin of N1 is the chip ground GND, the 2nd pin MCU-TXD1_480 of the chip N1 and the 18th pin MCU-TXD1 of the chip N1 are a group of level conversion signals, the 2nd pin MCU-TXD1_480 is a 5V voltage, the 18th pin MCU-TXD1 is a 3.3V voltage, the 3rd pin PTT-MCU of N1 and the 17th pin PTT-M of N1 are another group of level conversion signals, wherein the 3rd pin PTT-MCU is a 5V voltage, and the 17th pin PTT-M is a 3.3V voltage.

9. An application method of a handheld terminal for a road crossing station test, implemented based on the handheld terminal for a road crossing station test according to any one of claims 1 to 8, characterized in that: The method includes a proximity warning function test and a crossing alarm function test, and the process of the proximity warning function test is as follows: the handheld terminal is turned on, the user operates the keyboard and presses the "A" key, the processor LPC1765 detects the signal that the "A" key is pressed through the key circuit, and the processor identifies the signal and confirms the key instruction; when the confirmation instruction is to send a proximity warning special test message, the LPC1765 starts the relevant process; the LPC1765 first generates a proximity warning special test message in the POCSAG format through its MIC-DAC signal output end; the generated message signal is transmitted to the switching unit through the MIC-DAC port; the switching unit transmits the signal to the MIC-480 pin of the interface socket XS4 according to the signal path requirements, and finally the signal is sent by the channel sending machine connected to the interface socket; the channel sending machine sends the proximity warning special test message to the crossing station according to a specific frequency; After receiving the signal, the crossing station enters the corresponding test mode and completes the test of the approach warning function; The process of the crossing alarm function test is as follows: the handheld terminal is turned on, and the Kenwood TK480 handheld station is responsible for receiving the radio frequency signal; the crossing station sends a special test message for crossing alarm through a specific frequency, and after the TK480 handheld station receives the signal, it transmits the FFSK signal to the AF audio pin of the interface socket XS4 through its internal radio frequency signal demodulation module; the interface socket sends the signal to the FFSK signal processing circuit for further processing; the FFSK signal processing circuit performs preliminary decoding on the signal, and inputs the decoded signal to the LPC1765 processor through the AF-DECODE pin; the LPC1765 processor completes the complete decoding of the FFSK signal through the AF-Collect pin, and when the decoding result shows that the received is a special test message for crossing alarm, the processor triggers the prompt logic; the prompt logic displays "crossing alarm test information received" to the user through the LCD display circuit, and at the same time emits a prompt sound through the buzzer to confirm that the receiving operation is successful and the test function is completed.

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