Vehicle-mounted RS485 communication expansion isolation device

Abstract

The utility model provides a vehicle-mounted RS485 communication expansion isolation device, which solves the problems and risks of disordered or interrupted RS485 information receiving of each system caused by overload of external broadcast information of the traditional vehicle-mounted RS485 information expansion equipment and the limitation of the number of interfaces, and comprises a vehicle-mounted mounting box and an isolation circuit board, the isolation circuit board comprises a power supply input port DY, a front end TAX-RS485 signal input port JX4, a DC-DC power supply module, an isolation power supply, a digital isolator, a rear end RS485 transceiver and a rear end RS485 output port SC. The DC-DC power supply module supplies power to the isolation power supply and the front end of the digital isolator, and the isolation power supply isolates a 5V power supply output by the DC-DC power supply module and supplies the 5V power supply to the rear-stage and rear-end RS485 transceiver of the digital isolator.

Description

TECHNICAL FIELD

[0001] The utility model relates to RS485 communication field, concretely relates to a vehicle-mounted RS485 communication expansion isolation device. BACKGROUND

[0002] With the diversified development of railway system, the RS485 information demand of various types of locomotive vehicle-mounted system based on train operation monitoring device (LKJ) system is more and more intense, and the interface of locomotive safety information comprehensive monitoring device (TAX) each plug-in unit cannot meet the demand of various types of vehicle-mounted equipment on LKJ system RS485 information. The current RS485 information expansion equipment cannot meet the current demand due to the lack of information isolation function in the design logic, the risk of external broadcast information overload leading to RS485 information receiving disorder or interruption of each system and the limitation of interface quantity. UTILITY MODEL CONTENT

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a vehicle-mounted RS485 communication expansion isolation device, which solves the problems and risks of external broadcast information overload leading to RS485 information receiving disorder or interruption of each system and the limitation of interface quantity in the traditional vehicle-mounted RS485 information expansion equipment, and cannot meet the current demand.

[0004] The technical scheme is that a vehicle-mounted installation box and an isolation circuit board are included, the isolation circuit board includes a power input port DY, a front end TAX-RS485 signal input port JX4, a DC-DC power module, an isolation power supply, a digital isolator, a rear end RS485 transceiver and a rear end RS485 output port SC; the DC-DC power module supplies power to the isolation power supply and the front end of the digital isolator, and the isolation power supply isolates the 5V power output by the DC-DC power module and supplies the power to the rear end of the digital isolator and the rear end RS485 transceiver.

[0005] In the above or some embodiments, a plurality of isolation output circuits are further included, each isolation output circuit includes a corresponding independent isolation power supply, a digital isolator and a rear end RS485 transceiver, and forms a structure of a plurality of independent outputs input by the front end TAX-RS485 signal input port JX4.

[0006] In the above or some embodiments, the front end TAX-RS485 signal input port JX4 is connected with the vehicle-mounted TAX interface.

[0007] In the above or some embodiments, the power input port DY is connected with the locomotive power supply to supply power to the whole device, and the DC-DC power module is connected with the locomotive DC110V / 74V and outputs DC5V.

[0008] In the above or some embodiments, each of the digital isolators outputs the isolated serial port signal converted from the TAX-RS485 front end to the rear-end RS485 transceiver.

[0009] In the above or some embodiments, each of the rear-end RS485 transceivers converts the isolated serial port signal output by the front stage into an RS485 signal and communicates with the vehicle-mounted device through the output port SC.

[0010] In the above or some embodiments, the vehicle-mounted box structure shell is divided into an upper cover, a box body and a vehicle-mounted base, the upper cover is provided with heat dissipation holes, and the vehicle-mounted base is a pull-out mounting structure.

[0011] The utility model solves the current TAX interface can not satisfy all kinds of vehicle-mounted equipment to LKJ system RS485 information's demand, improves the stability of RS485 information outside system through the setting isolation, satisfies the traditional vehicle-mounted RS485 information expansion equipment and the risk of the problem and the risk that external broadcast information overload leads to each system RS485 information receiving confusion or interruption and the restriction of interface number. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the utility model vehicle-mounted RS485 communication expansion isolation device architecture schematic diagram.

[0013] Figure 2 It is the utility model vehicle-mounted RS485 communication expansion isolation device appearance design drawing. DETAILED DESCRIPTION

[0014] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0015] In the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise explicitly and specifically limited.

[0016] The utility model discloses a vehicle-mounted installation box 100 and isolation circuit board, and the isolation circuit board realizes the isolation function to RS485 signal, and the vehicle-mounted installation box provides the installation space of isolation circuit board.

[0017] The vehicle-mounted box 100 is a box body 101 structure, and internally includes a convex rib for plugging and mounting an isolation circuit board. Each isolation circuit board is fixed in the box body 101 by screws or plugging. The box body further includes a cover 102 above the box body, and the box body and the cover 102 form a cover structure. The box body further includes a vehicle-mounted base 103 at the bottom of the box body. The vehicle-mounted base and the vehicle body can adopt a track type plugging structure for convenient installation, and are fixed and connected by fastening screws. The upper cover is provided with a heat dissipation hole 104. The vehicle-mounted base is a pull-out type mounting structure.

[0018] The isolation circuit board includes a power input port DY, a front end TAX-RS485 signal input port JX4, a vehicle-mounted TAX interface connected to the front end TAX-RS485 signal input port JX4, a DC-DC power module, an isolation power supply, a digital isolator, a rear end RS485 transceiver, and a rear end RS485 output port SC.

[0019] In the above or some embodiments, a plurality of isolation output circuits are included. Each isolation output circuit includes a corresponding independent isolation power supply, a digital isolator, and a rear end RS485 transceiver, forming a structure for inputting a plurality of independent outputs from the front end TAX-RS485 signal input port JX4.

[0020] Each DC-DC power module supplies power to the front end of the isolation power supply and the digital isolator. The isolation power supply isolates the 5V power output by the DC-DC power module and supplies it to the rear stage of the digital isolator and the rear end RS485 transceiver.

[0021] In the above or some embodiments, the power input port DY is connected to the locomotive power supply to supply power to the entire device. The front end of the DC-DC power module is connected to the locomotive DC 110V / 74V and outputs DC 5V.

[0022] In the above or some embodiments, each digital isolator isolates and outputs the serial port signal converted from the front end TAX-RS485 to the rear end RS485 transceiver.

[0023] In the above or some embodiments, each rear end RS485 transceiver converts the isolated serial port signal output by the front stage into an RS485 signal and communicates with the vehicle-mounted device through the output port SC. A plurality of output ports SC are provided at the rear end of the box body. The output port can adopt an aviation socket 105.

[0024] The utility model discloses a current TAX interface has been unable to satisfy all sorts of vehicle -mounted equipment to LKJ system RS485 information's demand, improves the stability of the RS485 information of system to outside through the setting isolation. Satisfy the problem and risk and the restriction of interface number that traditional vehicle -mounted RS485 information extension equipment is easy to have external broadcast information overload to cause each system RS485 information receiving confusion or interruption.

Claims

1. A vehicle-mounted RS485 communication expansion isolation device, comprising a vehicle-mounted installation box and an isolation circuit board, The isolation circuit board comprises a power input port DY, a front end TAX-RS485 signal input port JX4, a DC-DC power module, an isolation power supply, a digital isolator, a rear end RS485 transceiver, and a rear end RS485 output port SC; characterized in that: The DC-DC power module supplies power to the isolation power supply and the front end of the digital isolator, and the isolation power supply isolates the 5V power output by the DC-DC power module and supplies it to the rear stage of the digital isolator and the rear end RS485 transceiver.

2. The RS485 communication expansion isolation device for vehicle according to claim 1, characterized in that, It also includes multiple isolated output circuits, each of which includes a corresponding independent isolation power supply, digital isolator, and rear end RS485 transceiver, forming a structure that inputs multiple independent outputs from the front end TAX-RS485 signal input port JX4.

3. The RS485 communication expansion isolation device for vehicle according to claim 2, characterized in that, The front end TAX-RS485 signal input port JX4 is connected to the vehicle-mounted TAX interface.

4. The RS485 communication expansion isolation device for vehicle according to claim 3, characterized in that: The power input port DY is connected to the locomotive power supply to supply power to the entire device, and the DC-DC power module is connected to the locomotive DC110V / 74V and outputs DC5V.

5. The RS485 communication expansion isolation device for vehicle according to claim 4, characterized in that: Each digital isolator isolates and outputs the serial port signal converted from the front end TAX-RS485 to the rear end RS485 transceiver.

6. The RS485 communication expansion isolation device for vehicle according to claim 5, characterized in that: Each rear end RS485 transceiver converts the isolated serial port signal output by the previous stage into an RS485 signal and communicates with the vehicle-mounted device through the output port SC.

7. The RS485 communication expansion isolation device according to any one of claims 1-6, characterized in that: The shell of the vehicle-mounted installation box is divided into an upper cover, a box body, and a vehicle-mounted base, the upper cover has heat dissipation holes, and the vehicle-mounted base is a pull-out installation structure.

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