IP address dial-up device for rail transit

Abstract

The utility model discloses an IP address dial-up device for rail transit. The IP address dial-up device comprises a dial-up input circuit, a driving circuit and at least one dial-up detection control board, each dial detection control board comprises a detection circuit, an interface circuit and a controller; in each dial detection control board, the output end of the detection circuit is electrically connected with the input end of the corresponding controller through the corresponding interface circuit, and the output end of the controller is electrically connected with an external load; the output end of the dial-up input circuit is electrically connected with the input end of the detection circuit in each dial-up detection control board through the drive circuit. According to the utility model, a series resistor can be prevented from being pulled up to a VCC power supply, so that the situation of insufficient driving capability can be effectively avoided, mutual influence among controllers can be effectively isolated, higher fault-tolerant capability can be provided, and the situation of inaccurate identification or damage to the controllers can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to rail transit technical field, concretely relates to a IP address dialing device for rail transit. BACKGROUND

[0002] In the on-board passenger information system of rail transit, the equipment (such as host controller, LCD player, etc.) between the driver's room and the passenger room needs a unique IP address to carry out network communication and identification, which usually needs to set IP address dialing circuit. The IP address dialing circuit allocates a specific IP address for each device by setting dialing switch, to ensure that each device in the on-board passenger information system can identify each other and establish stable communication link.

[0003] In the traditional technology, the IP address dialing circuit is mostly located at the exposed place between the circuit board and the device shell, and its application scene usually has two kinds: the first is single board card dialing circuit, and the second is multi-board card dialing circuit, and the circuit design diagrams of the two dialing circuits are shown in Figure 1A and Figure 1B In the two circuit diagram designs, it is needed to pull up to VCC power supply through series resistance, and the driving capacity is limited, especially in the multi-board card dialing circuit, multiple board cards reuse a dialing switch, and the driving capacity is obviously insufficient. In addition, in the above design, the controller needs to match the VCC voltage of the dialing switch pull-up resistance, when the voltage is not matched, there is the case of inaccurate identification or damage to the controller, and in the multi-board card dialing circuit, the interface state is unstable, and there is the case that the board cards affect each other in the starting process, and the dialing detection interface fault tolerance is poor. CONTENT OF UTILITY MODEL

[0004] Therefore, the utility model provides a IP address dialing device for rail transit to solve the problems of limited driving capacity, poor fault tolerance and the case of inaccurate identification or damage to the controller of the existing IP address dialing circuit.

[0005] The utility model provides a IP address dialing device for rail transit, including dialing input circuit, drive circuit and at least one dialing detection control board,

[0006] Each dialing detection control board includes detection circuit, interface circuit and controller, in each dialing detection control board, the output end of detection circuit is connected with the input end of corresponding controller through corresponding interface circuit, and the output end of controller is connected with external load,

[0007] The output end of dialing input circuit is connected with the input end of detection circuit in each dialing detection control board through drive circuit.

[0008] Optionally, the driving circuit comprises a first transistor Q3, a second transistor Q4, a third transistor Q5, a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second capacitor C2.

[0009] The base of the first transistor Q3 is electrically connected with the output of the DIP input circuit through the second resistor R2, the first end of the third resistor R3 is connected to the common connection between the base of the first transistor Q3 and the second resistor R2, and the second end of the third resistor R3 is grounded; the collector of the first transistor Q3 is electrically connected with the 3.3V power supply through the first resistor R1, the first end of the first capacitor C1 and the first end of the second capacitor C2 are both connected to the common connection between the first resistor R1 and the 3.3V power supply, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are both grounded; the emitter of the first transistor Q3 is grounded.

[0010] The base of the second transistor Q4 and the base of the third transistor Q5 are both connected to the common connection between the collector of the first transistor Q3 and the first resistor R1, the collector of the third transistor Q5 is electrically connected with the 3.3V power supply, the emitter of the third transistor Q5 is electrically connected with the emitter of the second transistor Q4, and the collector of the second transistor Q4 is grounded; the input of the detection circuit in each DIP detection control board is connected to the common connection between the emitter of the third transistor Q5 and the emitter of the second transistor Q4; the negative electrode of the first diode D1 is also connected to the common connection between the emitter of the third transistor Q5 and the emitter of the second transistor Q4, and the positive electrode of the first diode D1 is grounded.

[0011] Optionally, in each DIP detection control board, the detection circuit comprises a fourth transistor Q6, a second diode D2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3 and a fourth capacitor C4.

[0012] In each of the dial code detection control boards, the base of the fourth triode Q6 is electrically connected to the output end of the driving circuit in sequence through the fourth resistor R4 and the second diode D2; the first end of the third capacitor C3 is connected to the common connection end between the second diode D2 and the output end of the driving circuit, and the second end of the third capacitor C3 is grounded; the first end of the fifth resistor R5 is connected to the common connection end between the base of the fourth triode Q6 and the fourth resistor R4, and the second end of the fifth resistor R5 is electrically connected to the 3.3V power supply end; the emitter of the fourth triode Q6 is electrically connected to the 3.3V power supply end, and the collector of the fourth triode Q6 is grounded through the sixth resistor R6; the first end of the seventh resistor R7 is connected to the common connection end between the collector of the fourth triode Q6 and the sixth resistor R6, and the second end of the seventh resistor R7 is electrically connected to the input end of the interface circuit in the corresponding dial code detection control board; the first end of the fourth capacitor C4 is connected to the common connection end between the second end of the seventh resistor R7 and the input end of the corresponding interface circuit, and the second end of the fourth capacitor C4 is grounded.

[0013] Optionally, each of the dial code detection control boards further comprises a push-pull circuit.

[0014] In each of the dial code detection control boards, the input end of the push-pull circuit is electrically connected to the output end of the corresponding controller, and the output end of the push-pull circuit is electrically connected to an external load.

[0015] Optionally, in each of the dial code detection control boards, the push-pull circuit comprises a fifth triode Q1 and a sixth triode Q2.

[0016] In each of the dial code detection control boards, the base of the fifth triode Q1 and the base of the sixth triode Q2 are connected together and electrically connected to the output end of the controller in the corresponding dial code detection control board; the collector of the fifth triode Q1 is electrically connected to a circuit power supply end, the emitter of the fifth triode Q1 and the emitter of the sixth triode Q2 are connected together and electrically connected to an external load, and the collector of the sixth triode Q2 is grounded.

[0017] Optionally, each of the dial code detection control boards further comprises a Schmitt trigger circuit and a bus transceiver circuit.

[0018] In each of the dial code detection control boards, the output end of the detection circuit is electrically connected to the corresponding interface circuit in sequence through the corresponding Schmitt trigger circuit and the bus transceiver circuit.

[0019] Optionally, the dial code input circuit comprises a dial switch and a pull-up circuit.

[0020] The output end of the dial switch is electrically connected with the input end of the driving circuit, and the pull-up circuit is electrically connected with the output end of the dial switch and the input end of the driving circuit.

[0021] Optionally, the dial input circuit further comprises an ESD protection circuit.

[0022] The ESD protection circuit is electrically connected with the output end of the dial switch and the input end of the driving circuit.

[0023] Optionally, in each dial detection control board, the interface circuit is specifically a GPIO input and output interface.

[0024] Optionally, in each dial detection control board, the controller is specifically any one of an MCU, a CPU, a SOC and an FPGA.

[0025] The dial input circuit is electrically connected with the detection circuit in each dial detection control board through the driving circuit, so that the dial input circuit can be prevented from being pulled up to the VCC power supply through a series resistor, and the driving capacity can be effectively avoided from being insufficient. Even when the dial detection control board is multiple and forms a multi-board dial circuit, the driving capacity is not insufficient. In each dial detection control board, the corresponding detection circuit and the interface circuit are electrically connected with the controller in the corresponding control board. The detection circuit has a one-way transmission characteristic, and can effectively isolate the mutual influence between the controllers during the power-on process of the controller. Meanwhile, the detection circuit can provide higher fault tolerance, and does not need to match the VCC power supply voltage. Even when the VCC power supply voltage changes from 3.3V to 24V, the detection of the IP address by the controller is not affected, and the controller is not damaged. The stability and reliability are high, and each device in the vehicle passenger information system of the rail transit can be effectively ensured to be recognized and establish a stable communication link. BRIEF DESCRIPTION OF DRAWINGS

[0026] The features and advantages of the present application will be more clearly understood through the following detailed description with reference to the accompanying drawings, which are shown schematically and should not be construed as limiting the present application. In the drawings:

[0027] Figure 1A and Figure 1B respectively show the structure diagrams of a single-board dial circuit and a multi-board dial circuit in the prior art;

[0028] Figure 2A and Figure 2B respectively show the structure diagrams of a single-board dial circuit and a multi-board dial circuit for rail transit in the embodiment of the present application;

[0029] Figure 3 A circuit design drawing of the driving circuit in the embodiment of the utility model is shown;

[0030] Figure 4 A circuit design drawing of the detection circuit in the embodiment of the utility model is shown;

[0031] Figure 5A And Figure 5B Respective structure diagrams of another single board dialing code circuit and multi-board dialing code circuit for rail transit in the embodiment of the utility model are shown;

[0032] Figure 6 A circuit design drawing of the push-pull circuit in the embodiment of the utility model is shown. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0034] EMBODIMENT

[0035] As shown in Figure 2A And Figure 2B An IP address dialing device for rail transit, comprising a dialing input circuit, a driving circuit and at least one dialing detection control board.

[0036] Each dialing detection control board comprises a detection circuit, an interface circuit and a controller. In each dialing detection control board, the output end of the detection circuit is electrically connected to the input end of the corresponding controller through the corresponding interface circuit, and the output end of the controller is electrically connected to an external load.

[0037] The output end of the dialing input circuit is electrically connected to the input end of the detection circuit in each dialing detection control board through the driving circuit.

[0038] The dial input circuit is electrically connected with the detection circuit in each dial detection control board through the driving circuit, which can avoid being pulled up to the VCC power supply through a series resistor, and thus can effectively avoid the situation of insufficient driving capacity, and even when the dial detection control board is multiple to form a multi-board dial circuit, the problem of insufficient driving capacity does not exist; in each dial detection control board, the corresponding detection circuit and the interface circuit are electrically connected with the controller in the corresponding control board, the detection circuit has a one-way transmission characteristic, and during the power-on process of the controller, the mutual influence between the controllers can be effectively isolated, and the detection circuit can provide higher fault tolerance, without matching the VCC power supply voltage, even if the VCC power supply voltage changes from 3.3V to 24V, the detection of the IP address by the controller will not be affected, and the situation of inaccurate identification or damaged controller will not occur, and the stability and reliability are high, and the devices in the vehicle passenger information system of the rail transit can be effectively ensured to be mutually identified and establish a stable communication link.

[0039] In the above device, the dial input circuit is used for configuring and inputting an IP address, generating a voltage signal corresponding to the IP address signal and transmitting the voltage signal to the driving circuit; the driving circuit is used for converting the received voltage signal into a signal suitable for subsequent circuit processing and transmitting the signal to the detection circuit of each dial detection control board; the detection circuit in each dial detection control board is used for detecting, identifying, decoding and converting the received signal to obtain a level signal representing the configured IP address and transmitting the level signal to the corresponding controller through the corresponding interface circuit; and the controller is used for analyzing and processing the level signal transmitted by the interface circuit, and then controlling the corresponding external load (specifically, the device in the vehicle passenger information system) to work.

[0040] It should be understood that the number of dial detection control boards in the embodiment is one or more, when it is one, the IP address dial device formed is a single-board dial circuit, and when it is multiple, the IP address dial device formed is a multi-board dial circuit. Wherein, Figure 2A The single-board dial circuit is shown, Figure 2B The multi-board dial circuit with n dial detection control boards is shown.

[0041] It should be understood that the utility model only improves the hardware circuit structure of the IP address dial device for rail transit to realize strong driving capacity, strong fault tolerance and less inaccurate identification or damaged controller, and does not involve computer improvement. The computer program involved is a conventional computer program in the field, which can be pre-burned on the controller chip of the IP address dial device.

[0042] Preferably, as Figure 3As shown, the driving circuit comprises a first transistor Q3, a second transistor Q4, a third transistor Q5, a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second capacitor C2;

[0043] The base of the first transistor Q3 is electrically connected with the output end of the dial input circuit through the second resistor R2, the first end of the third resistor R3 is connected to the common connection end between the base of the first transistor Q3 and the second resistor R2, and the second end of the third resistor R3 is grounded; the collector of the first transistor Q3 is electrically connected with the 3.3V power supply end through the first resistor R1, the first end of the first capacitor C1 and the first end of the second capacitor C2 are both connected to the common connection end between the first resistor R1 and the 3.3V power supply end, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are both grounded; the emitter of the first transistor Q3 is grounded.

[0044] The base of the second transistor Q4 and the base of the third transistor Q5 are both connected to the common connection end between the collector of the first transistor Q3 and the first resistor R1, the collector of the third transistor Q5 is electrically connected with the 3.3V power supply end, the emitter of the third transistor Q5 is electrically connected with the emitter of the second transistor Q4, and the collector of the second transistor Q4 is grounded; the input end of the detection circuit in each dial detection control board is connected to the common connection end between the emitter of the third transistor Q5 and the emitter of the second transistor Q4; the negative electrode of the first diode D1 is also connected to the common connection end between the emitter of the third transistor Q5 and the emitter of the second transistor Q4, and the positive electrode of the first diode D1 is grounded.

[0045] In the driving circuit with the above structure, the switching of the first transistor Q4 is used to control the second transistor Q4 and the third transistor Q5 respectively, and then the second transistor Q4 and the third transistor Q5 are used to control the external output of the signal, so that the driving capability can be effectively enhanced.

[0046] In the driving circuit with the above structure, the switching of the first transistor Q4 is used to control the second transistor Q4 and the third transistor Q5 respectively, and then the second transistor Q4 and the third transistor Q5 are used to control the external output of the signal, so that the driving capability can be effectively enhanced. Figure 3 In the driving circuit with the above structure, the switching of the first transistor Q4 is used to control the second transistor Q4 and the third transistor Q5 respectively, and then the second transistor Q4 and the third transistor Q5 are used to control the external output of the signal, so that the driving capability can be effectively enhanced.

[0047] Preferably, as Figure 4As shown in each of the dial code detection control board, the detection circuit includes a fourth transistor Q6, a second diode D2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3 and a fourth capacitor C4;

[0048] In each of the dial code detection control board, the base of the fourth transistor Q6 is electrically connected with the output end of the driving circuit through the fourth resistor R4 and the second diode D2 in turn; the first end of the third capacitor C3 is connected to the common connection end between the second diode D2 and the output end of the driving circuit, and the second end of the third capacitor C3 is grounded; the first end of the fifth resistor R5 is connected to the common connection end between the base of the fourth transistor Q6 and the fourth resistor R4, and the second end of the fifth resistor R5 is electrically connected with the 3.3V power supply end; the emitter of the fourth transistor Q6 is electrically connected with the 3.3V power supply end, and the collector of the fourth transistor Q6 is grounded through the sixth resistor R6; the first end of the seventh resistor R7 is connected to the common connection end between the collector of the fourth transistor Q6 and the sixth resistor R6, and the second end of the seventh resistor R7 is electrically connected with the input end of the interface circuit in the corresponding dial code detection control board; the first end of the fourth capacitor C4 is connected to the common connection end between the second end of the seventh resistor R7 and the input end of the corresponding interface circuit, and the second end of the fourth capacitor C4 is grounded.

[0049] Through the detection circuit with the above structure, the detection and identification of the signal transmitted by the driving circuit in each dial code detection control board can be ensured, and the detection of the IP address by each dial code detection control board can be realized. Without matching the pull-up VCC power supply voltage, even if the VCC power supply voltage changes from 3.3V to 24V, it will not affect the detection of the IP address by each dial code detection control board, and it will not appear inaccurate identification or damage the controller. The stability and reliability are high.

[0050] Figure 4 The detection circuit as shown is connected between each dial code detection control board and the driving module. The input end is connected with the output end of the driving module, and the output end is connected with the interface circuit in the rear stage. The detection circuit adopts a low-level trigger mode. The second diode D2 can effectively isolate high voltage and avoid damage to the detection interface of the rear-stage circuit. It can adapt to more voltage domain systems, such as commonly used 3.3V, 5V, 12V, 24V and 110V power supply systems.

[0051] Preferably, as shown in Figure 5A and Figure 5B Each of the dial code detection control boards further includes a push-pull circuit.

[0052] The input end of the push-pull circuit is electrically connected with the output end of the corresponding controller, and the output end of the push-pull circuit is electrically connected with an external load.

[0053] The push-pull circuit is used to realize the driving control of the controller on the external load, so that the external load can work normally, the output current capacity is strong, and the switching speed is fast.

[0054] Specifically, as shown in Figure 6 The push-pull circuit includes a fifth transistor Q1 and a sixth transistor Q2.

[0055] In each dial detection control board, the base of the fifth transistor Q1 and the base of the sixth transistor Q2 are connected together and electrically connected with the output end of the controller in the corresponding dial detection control board; the collector of the fifth transistor Q1 is electrically connected with a circuit power supply end, the emitter of the fifth transistor Q1 and the emitter of the sixth transistor Q2 are connected together and electrically connected with an external load, and the collector of the sixth transistor Q2 is grounded.

[0056] In the push-pull circuit composed of two transistors, when the input Vin of the input end is high, the fifth transistor Q1 is turned on, the sixth transistor Q2 is turned off, at this time, the output Vout of the output end is voltage VCC, which is high; when the input Vin of the input end is low, the sixth transistor Q2 is turned on, and the fifth transistor Q1 is turned off, at this time, the output Vout of the output end is voltage GND, which is low; using this push-pull mode, a clear high level or low level can be obtained, the high-low level switching can be realized, and the external load can work normally and be controlled more efficiently.

[0057] Preferably, as shown in Figure 5A and Figure 5B Each dial detection control board further includes a Schmitt trigger circuit and a bus transceiver circuit.

[0058] In each dial detection control board, the output end of the detection circuit is electrically connected with the corresponding interface circuit through the corresponding Schmitt trigger circuit and the bus transceiver circuit in sequence.

[0059] In each of the dial detection control boards, a Schmitt trigger circuit is arranged between the detection circuit and the interface circuit, so that the signal output by the detection circuit can be shaped to improve the anti-interference capability, the stability and reliability of the signal; then a bus transceiver circuit is further connected between the Schmitt trigger circuit and the interface circuit, so that the data communication between the detection circuit and the subsequent circuit can be realized, the real-time transmission and sharing of data can be ensured, the anti-interference capability of the signal can be further enhanced, and the electrical isolation between the detection circuit and the subsequent circuit can be realized.

[0060] The Schmitt trigger circuit and the bus transceiver circuit can be designed by using conventional circuits, and the embodiment is not limited.

[0061] Preferably, as shown in Figure 5A and Figure 5B , the dial input circuit comprises a dial switch and a pull-up circuit.

[0062] The output end of the dial switch is electrically connected with the input end of the driving circuit, and the pull-up circuit and the output end of the dial switch are both electrically connected with the input end of the driving circuit.

[0063] The dial switch can be used for system configuration and setting, and through different switch combinations of the dial switch, a voltage signal representing different IP addresses can be generated, so that the corresponding IP addresses can be allocated to each device in the vehicle passenger information system in the subsequent process; through the pull-up circuit, the voltage signals of different IP addresses can be pulled to a fixed and determined high level or low level state, so that the dial detection control board can more accurately analyze and identify the IP addresses in the subsequent process.

[0064] Preferably, as shown in Figure 5A and Figure 5B , the dial input circuit further comprises an ESD protection circuit.

[0065] The ESD protection circuit is electrically connected with the output end of the dial switch and the input end of the driving circuit.

[0066] Through the ESD protection circuit, the entire device can be protected from damage caused by electrostatic discharge, and the high voltage and overcurrent generated by electrostatic discharge can be suppressed.

[0067] The ESD protection circuit usually comprises a transient suppression device and a filter circuit, and the transient suppression device and the filter circuit are designed by using conventional circuits, and the specific details are not described here.

[0068] Specifically, in each of the dial detection control boards, the interface circuit is specifically a GPIO input and output interface.

[0069] In the dial detection control board, the GPIO input and output interface is used as the interface circuit, signals transmitted in the previous circuit and matched with the IP address can be read, and the signals are converted into digital signals for subsequent processing, having high flexibility and universality, ensuring compatibility with various devices in the vehicle passenger information system; the interface also has stable level characteristics, ensuring that the controller in the rear stage is provided with accurate digital signals, has strong anti-interference performance, low cost, is easy to implement, has strong expandability, and is convenient for application in the dial circuit application scene of multiple boards.

[0070] Specifically, in each dial detection control board, the controller is specifically any one of MCU, CPU, SOC and FPGA.

[0071] The MCU is a microcontroller, has the advantages of high integration, easy development and low power consumption, can reduce the demand for external components, simplify circuit design, and reduce cost and space occupation; the CPU is a central processing unit, in the IP address dial application environment of the embodiment, can ensure fast reading and processing of the dial switch state, has strong control ability, can control each component in the circuit to act according to the requirements of the instruction, so as to realize the function of the instruction, and help to ensure the stable operation of the IP address dial circuit; the SOC is a system on chip, has high processing efficiency, provides higher performance through more efficient component communication and reduced inter-chip communication delay, can ensure real-time processing and response of the dial switch state; the FPGA is a field programmable gate array, can realize high-speed parallel processing, has good acceleration effect, in the IP address dial circuit, this can ensure fast reading and processing of the dial switch state, and improve the performance of the overall circuit.

[0072] The embodiment can select any suitable specification or product model as the controller in MCU, CPU, SOC and FPGA according to actual conditions, which is not limited here.

[0073] The devices such as transistors, diodes, resistors and capacitors in the circuit modules of the embodiment can be selected according to actual conditions, which is not limited here.

[0074] Although the embodiments of the utility model are described in combination with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and changes all fall within the scope defined by the appended claims.

Claims

1. An IP dialer for rail transportation, characterized in that, The dial input circuit, the driving circuit and at least one dial detection control board are included. Each dial detection control board includes a detection circuit, an interface circuit and a controller. In each dial detection control board, the output of the detection circuit is electrically connected to the input of the corresponding controller through the corresponding interface circuit, and the output of the controller is electrically connected to an external load. The output of the dial input circuit is electrically connected to the input of the detection circuit in each dial detection control board through the driving circuit.

2. The IP dialer for rail transportation as claimed in claim 1, wherein, The driving circuit includes a first transistor Q3, a second transistor Q4, a third transistor Q5, a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second capacitor C2. The base of the first transistor Q3 is electrically connected to the output of the dial input circuit through the second resistor R2, the first end of the third resistor R3 is connected to the common connection end between the base of the first transistor Q3 and the second resistor R2, and the second end of the third resistor R3 is grounded. The collector of the first transistor Q3 is electrically connected to a 3.3V power supply end through the first resistor R1, the first end of the first capacitor C1 and the first end of the second capacitor C2 are both connected to the common connection end between the first resistor R1 and the 3.3V power supply end, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are both grounded. The emitter of the first transistor Q3 is grounded. The base of the second transistor Q4 and the base of the third transistor Q5 are both connected to the common connection end between the collector of the first transistor Q3 and the first resistor R1, the collector of the third transistor Q5 is electrically connected to the 3.3V power supply end, the emitter of the third transistor Q5 is electrically connected to the emitter of the second transistor Q4, and the collector of the second transistor Q4 is grounded. The input of the detection circuit in each dial detection control board is connected to the common connection end between the emitter of the third transistor Q5 and the emitter of the second transistor Q4. The negative electrode of the first diode D1 is also connected to the common connection end between the emitter of the third transistor Q5 and the emitter of the second transistor Q4, and the positive electrode of the first diode D1 is grounded.

3. The IP dialer for rail transportation as claimed in claim 1, wherein, In each dial detection control board, the detection circuit includes a fourth transistor Q6, a second diode D2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3 and a fourth capacitor C4. In each of the dial code detection control boards, the base of the fourth transistor Q6 is electrically connected to the output end of the driving circuit in sequence through the fourth resistor R4 and the second diode D2; the first end of the third capacitor C3 is connected to the common connection end between the second diode D2 and the output end of the driving circuit, and the second end of the third capacitor C3 is grounded; the first end of the fifth resistor R5 is connected to the common connection end between the base of the fourth transistor Q6 and the fourth resistor R4, and the second end of the fifth resistor R5 is electrically connected to the 3.3V power supply end; the emitter of the fourth transistor Q6 is electrically connected to the 3.3V power supply end, and the collector of the fourth transistor Q6 is grounded through the sixth resistor R6; the first end of the seventh resistor R7 is connected to the common connection end between the collector of the fourth transistor Q6 and the sixth resistor R6, and the second end of the seventh resistor R7 is electrically connected to the input end of the corresponding interface circuit in the dial code detection control board; the first end of the fourth capacitor C4 is connected to the common connection end between the second end of the seventh resistor R7 and the input end of the corresponding interface circuit, and the second end of the fourth capacitor C4 is grounded.

4. The IP dialer for rail transportation as claimed in claim 1, wherein, Each of the dial code detection control boards further comprises a push-pull circuit. In each of the dial code detection control boards, the input end of the push-pull circuit is electrically connected to the output end of the corresponding controller, and the output end of the push-pull circuit is electrically connected to an external load.

5. The IP dialer for rail transportation as claimed in claim 4, wherein, In each of the dial code detection control boards, the push-pull circuit comprises a fifth transistor Q1 and a sixth transistor Q2. In each of the dial code detection control boards, the base of the fifth transistor Q1 and the base of the sixth transistor Q2 are connected together and electrically connected to the output end of the controller in the corresponding dial code detection control board; the collector of the fifth transistor Q1 is electrically connected to a circuit power supply end, the emitter of the fifth transistor Q1 and the emitter of the sixth transistor Q2 are connected together and electrically connected to an external load, and the collector of the sixth transistor Q2 is grounded.

6. The IP dialer for rail transportation as claimed in claim 1, wherein, Each of the dial code detection control boards further comprises a Schmitt trigger circuit and a bus transceiver circuit. In each of the dial code detection control boards, the output end of the detection circuit is electrically connected to the corresponding interface circuit in sequence through the corresponding Schmitt trigger circuit and the bus transceiver circuit.

7. The IP dialer for rail transportation as claimed in claim 1, wherein, The dial code input circuit comprises a dial switch and a pull-up circuit. The output end of the dial switch is electrically connected to the input end of the driving circuit, and the pull-up circuit is electrically connected to the output end of the dial switch and the input end of the driving circuit.

8. The IP dialer for rail transportation as claimed in claim 7, wherein, The dial code input circuit further comprises an ESD protection circuit. The ESD protection circuit is electrically connected to the output end of the dial switch and the input end of the driving circuit.

9. The IP dialer for rail transportation according to any of claims 1 to 8, characterized in that, In each of the dial code detection control boards, the interface circuit is specifically a GPIO input and output interface.

10. The IP dialer for rail transportation according to any of claims 1 to 8, characterized in that, In each of the dial code detection control boards, the controller is specifically any one of an MCU, a CPU, a SOC, and an FPGA.

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