A cabin controller

Abstract

The utility model relates to a controller for cabin hospitals, which belongs to the field of distributed infrastructure Internet of Things control technology, and solves the problem that cabin hospitals in the prior art lack a stable and reliable edge controller. The controller includes a shell, a base plate, a gigabit network switch and multiple sensors; the base plate includes a Wiegand processor, a basic processor, and an interface circuit; the network port of the gigabit network switch is connected to the base plate; one end of the Wiegand processor is connected to the interface circuit, and the other end is connected to the basic processor; a through hole is provided on the front wall of the shell, and a wiring terminal runs through the through hole on the front wall of the shell; the interface circuit receives data from multiple sensors through the data input interface of the wiring terminal and sends it to the basic processor; the data sent by the basic processor to the outside is sent to each sensor through the data output interface of the wiring terminal through the interface circuit. A kind of edge controller for cabin hospitals is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of distributed infrastructure Internet of Things control, and in particular to an edge controller for a square cabin hospital. Background Art

[0002] The integration of various products from different manufacturers and models required by the shelter itself requires the edge computing module to be able to access a variety of devices and adapt to the access of devices that may be needed in the future. This requires the edge computing module to have multiple types and multiple channels of communication and I / O interfaces. On the other hand, the rapid construction characteristics of the shelter itself require the edge computing module to reduce wiring pins, be able to install quickly, and be able to intelligently identify access devices to reduce manual configuration. These two aspects are contradictory, so it is necessary to find a balance between the two to achieve the unity of module multi-function and simplicity and ease of use.

[0003] In the intelligent application of square cabins, it is necessary not only to collect and control the basic information in the cabin, but also to provide all-round information interaction for future intelligent application scenarios such as intelligent medical equipment and robots in the cabin, such as environmental information interaction and patient status. This requires the terminal module to use the sensing devices of various connected sensors (various sensors, cameras, human-computer interaction devices, etc.) to obtain sufficient cabin information and personnel information, and provide data guidance for the normal operation of intelligent devices / robots.

[0004] The existing technology lacks a stable and reliable edge controller for square cabin hospitals. Utility Model Content

[0005] In view of the above analysis, the utility model aims to provide a cabin controller to solve the problem that the prior art lacks a stable and reliable controller for cabin hospitals.

[0006] The purpose of this utility model is mainly achieved through the following technical solutions:

[0007] A cabin controller comprises a shell, a base plate, a gigabit network switch and a plurality of sensors; the base plate comprises a Wiegand processor, a basic processor and an interface circuit; the network port of the gigabit network switch is connected to the base plate; one end of the Wiegand processor is connected to the interface circuit, and the other end is connected to the basic processor; a through hole is provided on the front wall of the shell, and a wiring terminal passes through the through hole of the front wall of the shell; the interface circuit receives data from a plurality of sensors through a data input interface of the wiring terminal and sends the data to the basic processor; the data sent out by the basic processor is sent to the data output interface of the wiring terminal through the interface circuit and then sent to each sensor.

[0008] Furthermore, the interface circuit includes 3 RS485 interface circuits, 1 RS232 interface circuit, 1 RS422 interface circuit, 2 CAN interface circuits, 6 data input interfaces, and 8 data output interfaces.

[0009] Furthermore, the RS485 interface circuit includes an isolation chip U8, a common-mode inductor L9, a terminal resistor, a pull-up resistor R142, and a pull-down resistor R141; one end of the RS485 terminal is connected to the sensor, and the other end is connected to the same-name terminals 1 and 2 of the common-mode inductor L9 in the RS485 interface circuit; the terminal resistor is connected between the same-name terminals 1 and 2 of the common-mode inductor L9; the 4th and 3rd pins of the common-mode inductor L9 are respectively connected to the A and B pins of the isolation chip U8; the A pin of the isolation chip U8 is connected to the positive pole of the 5V power supply through the pull-up resistor R142; the B pin of the isolation chip U8 is grounded through the pull-down resistor R141, and the internal data sending and receiving pins of the isolation chip U8 are connected to the base processor of the baseboard.

[0010] Furthermore, the RS485 interface circuit also includes a gas discharge tube and a PTC thermistor; the RS485 terminal IO1 and IO2 pins are connected to one end of the PTC thermistor R125 and one end of the PTC thermistor R126; the other end of R125 is connected to pin 1 of the gas discharge tube G12; the other end of R126 is connected to pin 3 of the gas discharge tube G12; and pin 2 of the gas discharge tube G12 is grounded.

[0011] Furthermore, the RS232 interface circuit includes bidirectional TVS diodes T37, T38, and an isolation chip U19; one end of the RS232 terminal is connected to the sensor, and the other end is connected to the external data receiving and sending pins of the isolation chip. The external data receiving pin of the isolation chip is also connected to one end of the bidirectional TVS diode T37, and the other end of T37 is grounded; the external data sending pin of the isolation chip is connected to one end of the bidirectional TVS diode T38, and the other end of T38 is grounded.

[0012] Furthermore, the RS232 interface circuit also includes PTC thermistors R155, R156, and a gas discharge tube G11; the external data sending pin of the isolation chip U19 is also connected to one end of the PTC thermistor R155, and the other end of R155 is connected to the first pin of the gas discharge tube G11; the external data receiving pin of the isolation chip U19 is also connected to one end of the PTC thermistor R156, and the other end of the PTC thermistor R156 is connected to pin 3 of the gas discharge tube G11, and pin 2 of the gas discharge tube G11 is grounded.

[0013] Furthermore, the Gigabit network switch includes, in addition to one network port internally connected to the bottom board, one network port connected to an external device; the network port of the external device is connected to the upper switch.

[0014] Furthermore, the gigabit network switch includes a network switch processing chip, a network transformer, a gas discharge tube, a bidirectional TVS diode, a first current limiting resistor, a second current limiting resistor, and an RJ45 network port; the first current limiting resistor, the bidirectional TVS diode, and the second current limiting resistor are connected in series between each pair of internal differential signal pins of the network switch processing chip; the two ends of the bidirectional TVS diode are also connected to the internal differential input and output pins of the network transformer, the external input and output differential pins of the network transformer are connected to the gas discharge tube, and the gas discharge tube is also connected to the RJ45 network port.

[0015] Furthermore, the base plate also includes a power input protection circuit, and the power socket runs through the through hole of the front wall of the shell; the power socket is connected to an external 24V power supply and is internally connected to the base plate power input protection circuit, and the power input protection circuit includes a three-pole gas discharge tube, a varistor, and a bidirectional TVS tube in parallel; the three-pole gas discharge tube, the varistor, and the bidirectional TVS tube are connected in parallel between the positive and negative poles of the power supply at the external power input end.

[0016] Furthermore, the power input protection circuit also includes a resettable fuse, a P-channel field effect transistor, a resistor R1, a resistor R2, and an anti-reverse connection capacitor; one end of the resettable fuse is connected to the positive electrode of the power supply, and the other end is connected to the drain of the P-channel field effect transistor; the source of the P-channel field effect transistor is connected to the positive electrode of the input power supply inside the base plate; the gate of the P-channel field effect transistor is connected to the negative electrode of the power supply through R1; the gate of the P-channel field effect transistor is connected to the positive electrode of the input power supply inside the base plate through R2; the anti-reverse connection capacitor is connected in parallel between the positive and negative electrodes of the input power supply inside the base plate.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] 1. Based on the application scenario of Fangcang Hospital, this utility model designs and develops a distributed infrastructure IoT controller for Fangcang Hospital, which serves as the information collection and control node for each cabin of Fangcang Hospital control system. This controller is a distributed open platform with core capabilities such as storage and application at the network edge side of the Fangcang Hospital data source. It can provide edge intelligent services nearby, obtain information through various serial ports and network ports to connect to the terminal sensors, and perform real-time control; it meets the key needs of Fangcang Hospital digitalization in terms of agile connection, real-time business, data optimization, application intelligence, security and privacy protection.

[0019] 2. The controller of the utility model includes cabin environment monitoring, access control and lighting control.

[0020] 3. The utility model supports the upper switch to obtain the data of the cabin controller; supports connecting to the command or monitoring center through remote communication, and the baseboard basic processor GD32F470VGT7 used is a domestic embedded chip; supports distributed computing of domestic operating systems; can be used as a cabin central control device to interact with other independently running devices such as medical equipment, human-computer interaction equipment, etc. with data interaction interfaces in the room, and can be used as a remote control node to realize remote monitoring of the cabin by the central control room (including regional scene control).

[0021] 4. The RS485 and RS232 interface circuits of the utility model are electrically isolated by an isolation chip based on digital isolation technology and connected to the serial port of the baseboard basic processor GD32F470VGT7. The RS485 interface circuit adds a gas discharge tube G12 and a PTC thermistor to provide a certain degree of protection against lightning strikes and surges; the common mode inductor provides better suppression capability for common mode interference. As the main node, a 120 ohm terminal resistor is connected, and pull-up and pull-down resistors are added to achieve circuit stability. The RS232 interface circuit adds a gas discharge tube G11, a PTC thermistor, and a bidirectional TVS diode to provide a certain degree of protection against lightning strikes and surges.

[0022] 5. The utility model designs a power input protection circuit. In order to avoid the impact of abnormal power supply on the system and ensure that the abnormal power supply will not cause damage to the system, the following measures are taken in the circuit design: adding a three-pole gas discharge tube G3 to provide a certain degree of lightning protection; adding a varistor to provide greater surge and lightning protection; adding a bipolar TVS diode T1 to provide fast transient pulse protection; adding a power reverse polarity protection capacitor C10 to prevent power reverse connection measures to avoid damage to related circuits when the external power supply is reversed; adding a self-recovery fuse F1 to provide long-term overload protection.

[0023] 6. The network transformer part of the gigabit network switch of the utility model has a network transformer model of HX82409S and a gigabit network switch chip model of YT9215RBH, both of which are domestically produced chips. Each external network port is isolated from the outside through a network transformer. The external network interface uses a gas discharge tube for short-circuit protection, and a bidirectional TVS diode and a current-limiting resistor are added after the transformer isolation to further limit and restrict possible surge signals.

[0024] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0026] Figure 1 This is a schematic diagram of the connection of various components of a shelter controller;

[0027] Figure 2 This is a schematic diagram of the RS485 interface circuit of a shelter controller;

[0028] Figure 3 This is a schematic diagram of the RS232 interface circuit of a shelter controller;

[0029] Figure 4 This is a schematic diagram of the network transformer circuit in a gigabit network switch of a shelter controller;

[0030] Figure 5 The following is a schematic diagram of a power input protection circuit for a shelter controller. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0032] A specific embodiment of the utility model discloses a cabin controller, such as Figure 1 As shown. The controller includes a housing, a base plate, a gigabit network switch and multiple sensors; the base plate includes a Wiegand processor, a basic processor and an interface circuit; the network port of the gigabit network switch is connected to the base plate; one end of the Wiegand processor is connected to the interface circuit, and the other end is connected to the basic processor; a through hole is provided on the front wall of the housing, and a wiring terminal runs through the through hole on the front wall of the housing; the interface circuit receives data from multiple sensors through a data input interface of the wiring terminal and sends it to the basic processor; the data sent by the basic processor to the outside is sent to the data output interface of the wiring terminal through the interface circuit and then sent to each sensor.

[0033] Multiple sensors include environmental sensors, air quality sensors, and smoke alarms: Environmental sensors include temperature and humidity sensors, air pressure sensors, noise sensors, and light intensity sensors.

[0034] Specifically, environmental sensors including humidity sensors, air pressure sensors, noise sensors, light intensity sensors, as well as air quality sensors and smoke alarms are installed inside the cabin to collect temperature, humidity, air pressure, noise, light intensity, formaldehyde, carbon dioxide, PM1.0 / 2.5 / 10, TVOC in the cabin, and alarm for fire smoke, etc.

[0035] The interface circuit includes 3 RS485 interface circuits, 1 RS232 interface circuit, 1 RS422 interface circuit, 2 CAN interface circuits, 6 data input interfaces, and 8 data output interfaces.

[0036] Specifically, the interface circuit receives data from multiple sensors through RS485 interface, RS232 interface, RS422 interface, CAN interface, data input interface, and data output interface and sends it to the base plate; the data sent by the base plate to the outside is sent out through the interface board, including to multiple sensors, the door control reader of the other cabin, the door closer, the electromagnetic door lock, and the control panel.

[0037] The interface board sends the external output data sent by the base board to the external terminal device, including: 2-way electromagnetic door lock control data, 2-way door closer control data, 2-way card reader LED indicator status control data, and 2-way card reader buzzer control data.

[0038] Specifically, the interface board also includes 4-way Wiegand data interfaces, which are connected to the access control reader externally and the Wiegand processor of the base board internally; the Wiegand processor is used to convert the Wiegand data of the access control reader into UART serial data and transmit it to the base board basic processor. The 4-way Wiegand data interface of the interface board is used to receive card reading information from 4 card readers in 2 doors.

[0039] The RS485 interface circuit includes an isolation chip U8, a common-mode inductor L9, a terminal resistor, a pull-up resistor R142, and a pull-down resistor R141; one end of the RS485 terminal is connected to the sensor, and the other end is connected to the same-name terminals 1 and 2 of the common-mode inductor L9 in the RS485 interface circuit; the terminal resistor is connected between the same-name terminals 1 and 2 of the common-mode inductor L9; the 4th and 3rd pins of the common-mode inductor L9 are respectively connected to the A and B pins of the isolation chip U8; the A pin of the isolation chip U8 is connected to the positive pole of the 5V power supply through the pull-up resistor R142; the B pin of the isolation chip U8 is grounded through the pull-down resistor R141, and the internal data sending and receiving pins of the isolation chip U8 are connected to the base processor of the baseboard.

[0040] The RS485 interface circuit also includes a gas discharge tube and a PTC thermistor; the RS485 terminal IO1 and IO2 pins are connected to one end of the PTC thermistor R125 and one end of the PTC thermistor R126; the other end of R125 is connected to pin 1 of the gas discharge tube G12; the other end of R126 is connected to pin 3 of the gas discharge tube G12; and pin 2 of the gas discharge tube G12 is grounded.

[0041] The RS485 interface circuit schematic is as follows Figure 2 shown.

[0042] Specifically, the RS485 interface circuit is electrically isolated using an isolation chip based on digital isolation technology and is connected to the serial port of the baseboard basic processor GD32F470VGT7.

[0043] The interface circuit adds gas discharge tube G12 and PTC thermistor to provide a certain degree of protection against lightning and surge; the common mode inductor provides better suppression of common mode interference. As the main node, a 120 ohm terminal resistor is connected, and pull-up and pull-down resistors are added to achieve circuit stability.

[0044] The RS232 interface circuit schematic is as follows Figure 3 shown.

[0045] The RS232 interface circuit includes bidirectional TVS diodes T37, T38, and an isolation chip U19; one end of the RS232 terminal is connected to the sensor, and the other end is connected to the external data receiving and sending pins of the isolation chip. The external data receiving pin of the isolation chip is also connected to one end of the bidirectional TVS diode T37, and the other end of T37 is grounded; the external data sending pin of the isolation chip is connected to one end of the bidirectional TVS diode T38, and the other end of T38 is grounded.

[0046] The RS232 interface circuit also includes PTC thermistors R155, R156, and a gas discharge tube G11; the external data sending pin of the isolation chip U19 is also connected to one end of the PTC thermistor R155, and the other end of R155 is connected to the first pin of the gas discharge tube G11; the external data receiving pin of the isolation chip U19 is also connected to one end of the PTC thermistor R156, and the other end of the PTC thermistor R156 is connected to the 3rd pin of the gas discharge tube G11, and the 2nd pin of the gas discharge tube G11 is grounded.

[0047] Specifically, the RS232 interface circuit is electrically isolated using an isolation chip based on digital isolation technology and is connected to the serial port of the baseboard basic processor GD32F470VGT7.

[0048] The interface circuit adds gas discharge tube G11, PTC thermistor and bidirectional TVS diode to provide a certain degree of protection against lightning strikes and surges.

[0049] In addition to the 1-way network port connected to the backplane internally, the Gigabit network switch also includes 1-way network port connected to external devices; the network port of the external device is connected to the upper-level switch.

[0050] Specifically, the base plate communicates with the central computer through a gigabit network switch, including: the base plate basic processor saves the information after receiving the data sent by the sensor of the cabin, and composes the current environment, access control information and alarm information into a cabin status message and sends it to the external central computer through Ethernet (first through the gigabit network switch, then through the upper-level switch).

[0051] The gigabit network switch includes a network switch processing chip, a network transformer, a gas discharge tube, a bidirectional TVS diode, a first current limiting resistor, a second current limiting resistor, and an RJ45 network port; the first current limiting resistor, the bidirectional TVS diode, and the second current limiting resistor are connected in series between each pair of internal differential signal pins of the network switch processing chip; the two ends of the bidirectional TVS diode are also connected to the internal differential input and output pins of the network transformer, the external input and output differential pins of the network transformer are connected to the gas discharge tube, and the gas discharge tube is also connected to the RJ45 network port.

[0052] The schematic diagram of the network transformer circuit in the Gigabit network switch is as follows: Figure 4 shown.

[0053] Specifically, the network transformer model is HX82409S, and the Gigabit network switching chip model is YT9215RBH. Each external network port is isolated from the outside through a network transformer. The external network interface uses a gas discharge tube for short-circuit protection. After the transformer isolation, a bidirectional TVS diode and a current-limiting resistor are added to further limit and restrict possible surge signals.

[0054] The base plate also includes a power input protection circuit, and the power socket runs through the through hole on the front wall of the shell; the power socket is connected to an external 24V power supply and is internally connected to the base plate power input protection circuit, and the power input protection circuit includes a three-pole gas discharge tube, a varistor, and a bidirectional TVS tube in parallel; the three-pole gas discharge tube, the varistor, and the bidirectional TVS tube are connected in parallel between the positive and negative poles of the power supply at the external power input end.

[0055] The power input protection circuit also includes a resettable fuse, a P-channel field effect transistor, a resistor R1, a resistor R2, and an anti-reverse connection capacitor; one end of the resettable fuse is connected to the positive electrode of the power supply, and the other end is connected to the drain of the P-channel field effect transistor; the source of the P-channel field effect transistor is connected to the positive electrode of the input power supply inside the bottom plate; the gate of the P-channel field effect transistor is connected to the negative electrode of the power supply through R1; the gate of the P-channel field effect transistor is connected to the positive electrode of the input power supply inside the bottom plate through R2; and the anti-reverse connection capacitor is connected in parallel between the positive and negative electrodes of the input power supply inside the bottom plate.

[0056] The schematic diagram of the power input protection circuit is as follows: Figure 5 shown.

[0057] Specifically, the power input is 24VDC. In order to avoid the impact of abnormal power supply on the system and ensure that the abnormal power supply will not cause damage to the system, the following measures are taken in the circuit design: adding a three-pole gas discharge tube G3 to provide a certain degree of lightning protection; adding a varistor to provide greater surge and lightning protection; adding a bipolar TVS diode T1 to provide fast transient pulse protection; adding a reverse polarity protection capacitor C10 to increase power reverse polarity protection measures to avoid damage to related circuits when the external power supply is reversed; adding a self-recovery fuse F1 to provide long-term overload protection.

[0058] Compared with the prior art, the cabin controller provided in this embodiment is based on the application scenario of the cabin hospital, and designs and develops a distributed infrastructure IoT control system for the cabin hospital, which serves as the information collection and control node for each cabin of the cabin hospital control system. This controller is a distributed open platform with core capabilities such as storage and application on the network edge side of the data source of the cabin hospital. It can provide edge intelligent services nearby, obtain information through various serial ports and network ports to connect to the sensors of the terminal, and perform real-time control; it meets the key requirements of the digitalization of the cabin hospital in terms of agile connection, real-time business, data optimization, application intelligence, security and privacy protection. The cabin controller provided in this embodiment includes cabin environment monitoring, access control, and lighting control. The cabin controller provided in this embodiment supports the upper-layer switch to obtain the cabin controller data; supports connecting to the command or monitoring center through remote communication, and the adopted baseboard basic processor GD32F470VGT7 is a domestic embedded chip; supports distributed computing of domestic operating systems; can be used as a cabin central control device to interact with other independently running devices such as medical equipment, human-computer interaction equipment, etc. with data interaction interfaces in the room, and can be used as a remote control node to realize remote monitoring of the cabin by the central control room (including regional scene control).

[0059] Those skilled in the art can understand that the program / software involved in the cabin controller in the above embodiment is a common method in the prior art, and the present invention does not involve any improvement in software. The present invention only requires that each device with corresponding functions be connected through the connection relationship given in the embodiment of the present invention, which does not involve any improvement in program software. As for the connection method between the hardware devices with corresponding functions, it can be implemented by those skilled in the art using the prior art, and will not be described in detail here.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A shelter controller, characterized in that: The controller includes a shell, a base plate, a gigabit network switch and multiple sensors; the base plate includes a Wiegand processor, a basic processor and an interface circuit; the network port of the gigabit network switch is connected to the base plate; one end of the Wiegand processor is connected to the interface circuit, and the other end is connected to the basic processor; a through hole is provided on the front wall of the shell, and a wiring terminal passes through the through hole on the front wall of the shell; the interface circuit receives data from multiple sensors through the data input interface of the wiring terminal and sends it to the basic processor; the data sent by the basic processor to the outside is sent to the data output interface of the wiring terminal through the interface circuit and then sent to each sensor.

2. The shelter controller according to claim 1, characterized in that: The interface circuit includes 3 RS485 interface circuits, 1 RS232 interface circuit, 1 RS422 interface circuit, 2 CAN interface circuits, 6 data input interfaces, and 8 data output interfaces.

3. The shelter controller according to claim 2, characterized in that: The RS485 interface circuit includes an isolation chip U8, a common-mode inductor L9, a terminal resistor, a pull-up resistor R142, and a pull-down resistor R141; one end of the RS485 terminal is connected to the sensor, and the other end is connected to the same-name terminals 1 and 2 of the common-mode inductor L9 in the RS485 interface circuit; the terminal resistor is connected between the same-name terminals 1 and 2 of the common-mode inductor L9; the 4th and 3rd pins of the common-mode inductor L9 are respectively connected to the A and B pins of the isolation chip U8; the A pin of the isolation chip U8 is connected to the positive pole of the 5V power supply through the pull-up resistor R142; the B pin of the isolation chip U8 is grounded through the pull-down resistor R141, and the internal data sending and receiving pins of the isolation chip U8 are connected to the base processor of the baseboard.

4. The shelter controller according to claim 3, characterized in that: The RS485 interface circuit also includes a gas discharge tube and a PTC thermistor; the RS485 terminal IO1 and IO2 pins are connected to one end of the PTC thermistor R125 and one end of the PTC thermistor R126; the other end of R125 is connected to pin 1 of the gas discharge tube G12; the other end of R126 is connected to pin 3 of the gas discharge tube G12; and pin 2 of the gas discharge tube G12 is grounded.

5. The shelter controller according to claim 2, characterized in that: The RS232 interface circuit includes bidirectional TVS diodes T37, T38, and an isolation chip U19; one end of the RS232 terminal is connected to the sensor, and the other end is connected to the external data receiving and sending pins of the isolation chip. The external data receiving pin of the isolation chip is also connected to one end of the bidirectional TVS diode T37, and the other end of T37 is grounded; the external data sending pin of the isolation chip is connected to one end of the bidirectional TVS diode T38, and the other end of T38 is grounded.

6. The shelter controller according to claim 5, characterized in that: The RS232 interface circuit also includes PTC thermistors R155, R156, and a gas discharge tube G11; the external data sending pin of the isolation chip U19 is also connected to one end of the PTC thermistor R155, and the other end of R155 is connected to the first pin of the gas discharge tube G11; the external data receiving pin of the isolation chip U19 is also connected to one end of the PTC thermistor R156, and the other end of the PTC thermistor R156 is connected to the 3rd pin of the gas discharge tube G11, and the 2nd pin of the gas discharge tube G11 is grounded.

7. The shelter controller according to claim 1, characterized in that: In addition to the 1-way network port connected to the backplane internally, the Gigabit network switch also includes 1-way network port connected to external devices; the network port of the external device is connected to the upper-level switch.

8. The shelter controller according to claim 7, characterized in that: The gigabit network switch includes a network switch processing chip, a network transformer, a gas discharge tube, a bidirectional TVS diode, a first current limiting resistor, a second current limiting resistor, and an RJ45 network port; the first current limiting resistor, the bidirectional TVS diode, and the second current limiting resistor are connected in series between each pair of internal differential signal pins of the network switch processing chip; the two ends of the bidirectional TVS diode are also connected to the internal differential input and output pins of the network transformer, the external input and output differential pins of the network transformer are connected to the gas discharge tube, and the gas discharge tube is also connected to the RJ45 network port.

9. The shelter controller according to claim 1, characterized in that: The base plate also includes a power input protection circuit, and the power socket runs through the through hole on the front wall of the shell; the power socket is connected to an external 24V power supply and is internally connected to the base plate power input protection circuit, and the power input protection circuit includes a three-pole gas discharge tube, a varistor, and a bidirectional TVS tube in parallel; the three-pole gas discharge tube, the varistor, and the bidirectional TVS tube are connected in parallel between the positive and negative poles of the power supply at the external power input end.

10. The shelter controller according to claim 9, characterized in that: The power input protection circuit also includes a resettable fuse, a P-channel field effect transistor, a resistor R1, a resistor R2, and an anti-reverse connection capacitor; one end of the resettable fuse is connected to the positive electrode of the power supply, and the other end is connected to the drain of the P-channel field effect transistor; the source of the P-channel field effect transistor is connected to the positive electrode of the input power supply inside the bottom plate; the gate of the P-channel field effect transistor is connected to the negative electrode of the power supply through R1; the gate of the P-channel field effect transistor is connected to the positive electrode of the input power supply inside the bottom plate through R2; and the anti-reverse connection capacitor is connected in parallel between the positive and negative electrodes of the input power supply inside the bottom plate.

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