A large-area site terminal control method

Abstract

The application relates to a large-area site terminal control method. In the method, the sensing terminals are connected to an upper computer, and the controlled terminals in the detection area of the sensing terminals are connected to the sensing terminals; the terminal control method comprises the following steps: the sensing terminals detect at least one variable in real time, and transmit the variable value to the upper computer; the upper computer judges whether the variable values transmitted by all the sensing terminals are abnormal; if it is judged that the variable values are abnormal, a control command is sent to the corresponding sensing terminal, the control command is used for controlling the operation of the controlled terminal corresponding to the variable; after receiving the control command, the sensing terminal sends a control signal to the controlled terminal. The application multiplexes the connection wire harness of the sensing terminal and the upper computer, omits the direct connection between the controlled terminal and the upper computer, reduces the number of long wire harnesses, reduces the required cost, reduces the wire harnesses connected to the upper computer, and reduces the probability of wire harness insertion error.

Description

Technical Field

[0001] This application relates to the field of terminal control technology, and in particular to a terminal control method for large-area venues. Background Technology

[0002] In some indoor locations, such as storage warehouses and production workshops, sensors are needed to determine whether real-time environmental indices exceed set ranges. If they do, corresponding environmental control equipment needs to be activated until the parameters return to the set range; for example, if the ambient temperature is high, the air conditioning is activated to cool it down. The conventional connection method involves multiple sensors directly connected to a main control device, and the main control device directly connected to the control equipment. The sensors transmit detection data to the main control device, which then sends adjustment commands to the control equipment after making its judgment. In large-area locations, a large number of sensors and control equipment are used, requiring numerous data cables to connect the sensors to the main control device and the main control device to each control device. Typically, in large-area locations, the distances between the main control device and the sensors, as well as between the main control device and the control equipment, are considerable, necessitating the laying of many long cable bundles, resulting in high costs and a large workload. Furthermore, some locations do not allow wireless transmission due to security and stability considerations.

[0003] Application content

[0004] The purpose of this application is to overcome the above-mentioned shortcomings of the prior art and provide a terminal control method for large-area venues to reduce costs.

[0005] To achieve the above objectives, this application adopts the following technical solution: a terminal control method for a large area, involving a host computer, several sensing terminals, and several controlled terminals. All sensing terminals are connected to the host computer, and the controlled terminals within the detection area of ​​a sensing terminal are connected to that sensing terminal. The terminal control method includes the following steps: a sensing terminal detects at least one variable in real time and transmits the variable value to the host computer; the host computer determines whether the variable values ​​transmitted from all sensing terminals are abnormal; if an abnormal variable value is detected, a control command is sent to the corresponding sensing terminal, which controls the operation of the controlled terminal corresponding to the variable; after receiving the control command, the sensing terminal sends a control signal to the controlled terminal.

[0006] The advantages of this application compared with the prior art are as follows: it connects the host computer and the controlled terminal respectively through the sensing terminal, and the controlled terminal is connected to the nearby sensing terminal. The control commands of the host computer are first sent to the sensing terminal, and then sent to the corresponding controlled terminal by the sensing terminal. It reuses the connection harness between the sensing terminal and the host computer, eliminates the direct connection between the controlled terminal and the host computer, reduces the number of long harnesses, reduces the required cost, and reduces the number of harnesses connected to the host computer, which also reduces the probability of incorrect harness insertion. Attached Figure Description

[0007] Figure 1 This is a topology diagram showing the connection between the host computer, the sensing terminal, and the controlled terminal in this application.

[0008] Figure 2 This is a flowchart of the terminal control method of this application.

[0009] Figure 3 This is a three-dimensional view of the sensing terminal structure of this application.

[0010] Figure 4 This is a connection diagram of the host computer, sensing terminal, and controlled terminal in this application.

[0011] Figure 5 This is a circuit connection diagram of the RJ45 interface of this application.

[0012] Figure 6 This is a schematic diagram of the circuit connection of the relay in the sensing terminal of this application.

[0013] Figure 7 This is a schematic diagram of the relay circuit connection of the host computer in this application.

[0014] It should be noted that the products shown in the above views have been appropriately scaled down / enlarged to fit the drawing size and ensure clarity of the views, and there is no limitation on the size of the products shown in the views. Detailed Implementation

[0015] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0016] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, materials, apparatuses, steps, etc., may be employed. In other instances, well-known structures, methods, apparatuses, implementations, materials, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0017] This application embodiment is a terminal control method for large-area venues, such as... Figure 1 As shown, it involves a host computer 10, several sensing terminals 20, and several controlled terminals 30. For example... Figure 1As shown, all sensing terminals 20 are connected to the host computer 10, while the controlled terminals 30 located within the detection area of ​​the sensing terminal 20 are connected to the sensing terminal 20. Figure 1 The three sensing terminals 20 and three controlled terminals 30 are merely examples and are not a limitation on the number of sensing terminals 20 and controlled terminals 30. The relationship between sensing terminals 20 and controlled terminals 30 can also be one-to-many, and is not limited to this. Figure 1 A one-to-one relationship in the context of [the relationship].

[0018] like Figure 2 As shown, the terminal control method includes the following steps: the sensing terminal detects at least one variable in real time and transmits the variable value to the host computer; the host computer determines whether the variable values ​​transmitted by all sensing terminals are abnormal; if the variable value is found to be abnormal, a control command is sent to the corresponding sensing terminal, and the control command is used to control the operation of the controlled terminal corresponding to the variable; after receiving the control command, the sensing terminal sends a control signal to the controlled terminal.

[0019] Therefore, it can be seen that the sensing terminal is electrically connected to both the host computer and the controlled terminal, while the controlled terminal only needs to be electrically connected to a nearby sensing terminal. The control commands from the host computer are first sent to the sensing terminal and then to the corresponding controlled terminal. This reuses the connection harness between the sensing terminal and the host computer, eliminating the direct connection between the controlled terminal and the host computer, reducing the number of long harnesses, and lowering the required cost. Moreover, the reduction in the number of harnesses connected to the host computer also reduces the probability of incorrect wiring.

[0020] The following provides a detailed description of the steps involved in the terminal control method.

[0021] like Figure 2 As shown, initialization is required upon initial power-on, before the sensing terminal begins detecting variables. Once the host computer, sensing terminal, and controlled terminal are correctly connected, the host computer acts as the central server, and each sensing terminal needs to be identified within the host computer. Sensing terminals can be smoke detectors, temperature and humidity sensors, or air quality sensors, etc. First, it checks whether the sensing terminal connected to the host computer has been correctly identified. If no unidentified terminal exists, the initialization step is skipped.

[0022] Upon initial power-on, if any sensor terminal is not recognized, it uploads a handshake packet containing its unique ID to the host computer. This handshake packet includes the sensor terminal ID, function type, version number, and power supply voltage (5V / 12V). The host computer uses the handshake packet to determine if the terminal is legitimate, identifies the sensor terminal type, sets the corresponding parameters, and outputs the correct operating voltage. Specifically, the host computer can determine if a terminal is legitimate based on its unique ID. If it is illegitimate, it will warn of the connection violation, requiring the user to manually disconnect the terminal. If it is legitimate, the host computer identifies the sensor terminal's type and function based on its unique ID and function type information, and then sets the corresponding parameters accordingly. For example, if the sensor terminal is used to detect temperature and humidity, the corresponding parameters are the temperature range and humidity range; if it is used to monitor air quality, the corresponding parameter is the pollutant content. Furthermore, the host computer can output the corresponding operating voltage based on the power supply voltage information in the handshake packet. The host computer includes a relay RL4, such as... Figure 7 As shown, Figure 7 The left-hand resistor R60 is connected to the high / low level output pins of the host computer. In the default state, the host computer outputs a low level to resistor R60. At this time, pins 6 and 7 of relay RL4 are connected, and pin 7 outputs 5V to the sensing terminal, preventing damage to some sensing terminals from initially providing a high level. After receiving the 5V voltage, the sensing terminal sends a handshake packet to the host computer. If the host computer recognizes the sensing terminal as a legitimate terminal and its power supply voltage is 12V, it outputs a high level to resistor R60. At this time, pins 5 and 7 of relay RL4 are connected, and pin 7 outputs 12V to the sensing terminal, allowing the sensing terminal to operate normally. When the sensing terminal's power supply voltage is 5V, the host computer maintains a low level output to resistor R60 to prevent damage to the sensing terminal from outputting 12V. This structure and method prevent damage caused by high voltage from terminals not paired with the host computer.

[0023] exist Figure 1 In this embodiment, the sensing terminal and the controlled terminal have a one-to-one mapping relationship. In other embodiments, if the sensing terminal is connected to multiple controlled terminals, then the sensing terminal and the controlled terminal have a one-to-many mapping relationship. After initialization, the sensing terminal and the host computer will periodically send heartbeat packets to each other to detect whether the link connection between them is normal. If an abnormality occurs, an alarm will be issued to indicate that there is a problem with the link or terminal and it needs to be repaired.

[0024] like Figure 2As shown, after initialization, the sensor terminal begins real-time monitoring. The sensor terminal detects at least one variable in real time and transmits the variable value to the host computer. The variable detected by the sensor terminal corresponds to its own function. For example, if the sensor terminal's function is to monitor air quality, the variable is the pollutant concentration; if the function is to detect temperature and humidity, the variables are real-time temperature and real-time humidity. If the sensor terminal's function is to detect smoke, the variable is the smoke concentration. The interval between variable detections by the sensor terminal can be adjusted, such as one second, ten seconds, or thirty seconds, to adapt to the monitoring needs of different situations. To improve transmission security, the variable values ​​detected by the sensor terminal can be encrypted before being transmitted to the host computer. The encryption method can be either symmetric or asymmetric encryption. The host computer can then decrypt the received variable value to obtain the variable value.

[0025] After the host computer receives the variable values ​​transmitted from the sensor terminal, such as... Figure 2 As shown, the host computer determines whether the variable values ​​transmitted from these sensor terminals are abnormal. To determine whether a variable value is abnormal, a normal range for the variable value needs to be defined first. After identifying the sensor terminals and controlled terminals in the previous initialization steps, the normal range of variable values ​​can be defined manually when setting the corresponding parameters, or the default normal range can be used directly. The normal range of variable values ​​should match the requirements of the location. If the variable value is temperature and humidity, and the location is a cold storage warehouse, then its normal range should be a lower temperature range and a lower humidity range. If the variable value is the pollutant content, and the requirement for the enclosed space is that it be dust-free, then the normal range of the variable value should be close to zero. When the variable value transmitted from the sensor terminal is not within the pre-set normal range, the variable value is considered abnormal; when the variable value transmitted from the sensor terminal is within the normal range, the variable value is considered normal. In addition, the host computer can also store the received variable values ​​for later retrieval for statistical analysis or traceability. In other embodiments, occasional detection deviations of the sensing terminal can be taken into account to reduce the probability of false alarms. For example, if the variable value transmitted by the sensing terminal exceeds the normal range, but the previous one or several variable values ​​are not significantly different, it indicates that the variable value is gradually increasing or decreasing. In this case, the variable value can be directly judged as abnormal. Alternatively, if the variable value transmitted by the sensing terminal exceeds the normal range, but its difference from the previous one or several variable values ​​is significant, it may be due to a detection deviation by the sensing terminal. In this case, the host computer can not immediately classify it as abnormal, but wait for the next variable value to be transmitted and continue to judge whether it deviates from the normal range. When a set number of variable values ​​have accumulated and none have fallen within the normal range, it can be judged that the variable value is abnormal.

[0026] like Figure 2As shown, if the host computer detects an abnormal value in the variable of the sensing terminal, it sends a control command to the corresponding sensing terminal. This control command is used to control the operation of the controlled terminal corresponding to the variable. Upon receiving the control command, the sensing terminal sends a control signal to the controlled terminal or outputs a 12V start-up voltage. The controlled terminal can be an air conditioner, fresh air system, fire sprinkler head, humidifier, or signal transmitter, etc., containing relays.

[0027] Control commands issued by the host computer can also be encrypted before being transmitted to the sensing terminal. After receiving the encrypted data, the sensing terminal decrypts it to obtain the control command, and then sends control signals to the controlled terminal according to the control command.

[0028] In some embodiments, the control signals emitted by the sensing terminal are also transmitted to the host computer. For example... Figure 2 As shown, if the host computer determines that the variable value of the sensing terminal is abnormal, it first generates a control command. Then, it compares the control command with the control signal received from the sensing terminal. If the effect of the control signal on the controlled terminal is the same as the effect of the control command, the control command is canceled. If they are different, a control command is sent to the corresponding sensing terminal. After the corresponding control is applied to the controlled terminal, the corresponding variable value may not immediately return to the normal range. The controlled terminal remains under the same control signal. In this case, the variable value received by the host computer will still be judged as abnormal, and the control command generated by the host computer will have the same effect as the control signal currently being received by the controlled terminal. Therefore, there is no need to send repeated control commands to the sensing terminal, thus avoiding control command failures.

[0029] Furthermore, in other embodiments, the controlled terminal should stop working once the variable value changes from abnormal to normal. If the host computer determines that the variable is within the normal range, it can further compare it with the previous one or several variable values ​​to see if they were abnormal. If the variable value changes from abnormal to normal, a stop-work control command is sent to the corresponding sensing terminal, causing the corresponding controlled terminal to stop working. If it is determined that the variable value has always been within the normal range, the variable value is directly stored, awaiting the next variable value from the sensing terminal.

[0030] like Figure 3 As shown, in some embodiments, each sensing terminal 20 is provided with a first port 21 and second ports 22A and 22B. The host computer is also provided with a first port of the same type and is connected to the first port 21 of the sensing terminal 20 through the first port. During the initial power-on initialization, the host computer will receive the unique ID of the sensing terminal 20 for identification. The wiring harness connecting the host computer and the sensing terminal 20 can be plugged into any first port of the host computer, without requiring a specific first port of the host computer to strictly correspond to a specific sensing terminal, thus reducing the difficulty of plugging in.

[0031] In this embodiment, the first port and the second port of the sensing terminal 20 each have 8 pins, and the 8 pins of the first port and the 8 pins of the second port are connected in parallel (physical parallel connection) in a one-to-one correspondence. Specifically, Figure 3 The first port 21 is an RJ45 interface, so the host computer and the sensing terminal 20 can be connected via an 8-core universal network cable with RJ45 plugs at both ends. Figure 5 In the RJ45 interface of the first port shown, pins 1 and 2 are used for RS485 communication, pins 4 and 7 are used for 12V voltage input, pins 5 and 8 are used for 12V voltage output, and pins 3 and 6 are used for switch output. Figure 5 The image shows an example of an 8-pin arrangement for an RJ45 interface, and is not intended to limit the 8-pin arrangement of an RJ45 interface to only one type. Figure 5 The example shown illustrates this. For the host computer, pins 4 and 7 are used to output voltage to the sensing terminal, while pins 5 and 8 are used to receive the voltage input returned by the sensing terminal 20.

[0032] Figure 3 The induction terminal 20 is provided with a second port 22A and a second port 22B, both of which are two sets of 4-pin Phoenix ports. Of the 4-pin Phoenix ports in the second port 22A, two pins are connected to… Figure 5 Pins 1 and 2 of the RJ45 interface are connected in parallel, and the other two pins are connected in parallel with pins 4 and 7 of the RJ45 interface. In the 4-pin Phoenix port of the second port 22B, two pins are connected in parallel with pins 5 and 8 of the RJ45 interface, and the other two pins are connected in parallel with pins 3 and 6 of the RJ45 interface. The controlled terminal only needs to receive a switching signal or 12V voltage from the sensing terminal 20; therefore, a controlled terminal and the second port 22B of the sensing terminal 20 can be effectively connected via a 2-pin or 4-pin wire harness with 4-pin Phoenix connectors at both ends. Since the first port and the second port are physically connected in parallel, the 12V voltage output of the RJ45 interface of the first port of the sensing terminal 20 will also be transmitted to the first port of the host computer at the same time. A step-down circuit is set between the main control I / O port of the host computer and the first port. The 12V voltage is reduced to a suitable voltage by the step-down circuit. After receiving the voltage, the host computer knows that the 12V voltage output of the sensing terminal has taken effect. The switch output of pins 3 and 6 of the RJ45 interface of the first port of the sensing terminal 20 is also transmitted to the host computer 10 at the same time, so that the host computer 10 can synchronously and in real time know the corresponding control signal status.

[0033] Therefore, it can be seen that the sensing terminal 20 can feed back relevant signal status to the host computer 10 without the need to lay additional lines. It makes full use of the existing lines for transmission, and the one line can be used for multiple purposes, which is more conducive to reducing the laying cost.

[0034] In addition, during implementation, different text marks, number marks, or shape marks need to be set on the surface of the sensing terminal 20 for the two sets of Phoenix ports to avoid incorrect insertion and failure.

[0035] Figure 3 In this design, the type of the first port 21 differs from that of the second ports 22A and 22B. Therefore, when connecting the relevant wiring harness to the sensing terminal 20, the chance of incorrect connection is reduced, and the connection difficulty is also lowered. Although the first port 21 is of a different type than the second ports 22A and 22B, their 8 cores are physically connected in parallel, so they serve the same function, allowing users to easily switch between connections and making the connection more flexible. The sensing terminal 20 can be connected to the host computer 10 via a standard RJ45 network cable, achieving one-line connectivity and automatic adaptation. After each sensing terminal 20 is connected to the host computer, its product type and function can be identified via its ID, improving efficiency and reducing the error rate.

[0036] In other embodiments, the second port may be an RJ45 interface, while the first port may be two sets of 4-pin Phoenix ports. In this case, the sensing terminal and the controlled terminal can be connected through a 4-core RJ45 network cable, and the sensing terminal and the host computer can be connected through two wire harnesses with 4-core Phoenix ports at both ends.

[0037] In other embodiments, the host computer can simultaneously set a first port and a second port connected in parallel, and the controlled terminal can also simultaneously set a first port and a second port connected in parallel. When the second port of the host computer is connected to the second port of the sensing terminal, the first port of the controlled terminal is connected to the first port of the sensing terminal, allowing the user to flexibly choose the application.

[0038] like Figure 4As shown, the sensing terminal 20 includes a main control unit 23, a display unit 25, a sensing unit 27, a sound unit 26, and an encryption / decryption unit 24. The display unit 25, sensing unit 27, sound unit 26, and encryption / decryption unit 24 are electrically connected to the main control unit 23. The main control unit 23 is an STMicroelectronics STM32F103 microcontroller. The display unit 25 displays detected data, such as temperature, humidity, air pollutant concentration, or smoke concentration, and can also display the date and time. The sound unit 26 can be a buzzer or a speaker. The buzzer can be used to alert to abnormal situations, while the speaker can broadcast the detected data verbally, and can also broadcast date and time information at set points. The sensing unit 27 uses sensors with corresponding functions, such as temperature and humidity sensors, air quality sensors, and smoke sensors. In some embodiments, the sensing unit 27 may also include an infrared sensor for sensing the approach of a human body. When the infrared sensor detects the approach of a human body, the main control unit 23 can enable the sound unit 26 to automatically broadcast information, such as time, date, temperature, humidity, pollutant content in the air, or smoke concentration, etc., which is convenient for patrol personnel to use in some situations.

[0039] The encryption / decryption unit 24 is used to encrypt / decrypt data transmitted or received. In this embodiment, the encryption / decryption unit 24 is an SM4 chip, model Huada Microcontroller 05S1-SOP8. The encryption / decryption unit 24 is used for SM4 encryption and SM4 decryption. Data transmitted to the host computer 10 (such as IDs, variable values, etc.) must first be encrypted using SM4 by the encryption / decryption unit 24. Data transmitted from the host computer 10 to the sensing terminal 20 (such as issued control commands, heartbeat packets, etc.) is decrypted by the encryption / decryption unit 24 and can then be read normally. Moreover, heartbeat packets encrypted with the SM4 algorithm are difficult to forge and not easily cracked, which can both periodically detect the link connection status and improve the security of the connection.

[0040] like Figure 4 As shown, the sensing terminal 20 includes a relay 28, which can be a double-pole double-throw relay. The relay 28 is electrically connected to the main control unit 23 and is used to output two switching signals and a 12V voltage. The relay 28 can control the opening and closing of controlled terminals 30 such as air conditioners, fresh air systems, fire sprinklers, or humidifiers.

[0041] like Figure 6 The diagram shows the circuit connection of relay RL3. Figure 6The left end of resistor R57 is connected to the main control unit. When the main control unit outputs a high level to resistor R57, pins 2 and 4 of relay RL3 are short-circuited, and pin 5 of relay RL3 outputs 12V. Therefore, pins 2 and 4 of relay RL3 serve as switch outputs, and pins 2 and 4 of relay RL3 are connected to pins 3 and 6 of the RJ45 interface, respectively. Because the first and second ports are physically connected in parallel, the switching output of relay 28 is also simultaneously transmitted to the host computer 10 via pins 3 and 6 of the RJ45 interface. This allows the host computer 10 to synchronously obtain the corresponding control signal status (the host computer can detect whether pins 2 and 4 of relay RL3 are short-circuited). This verifies whether the control signal is correct and effective, and facilitates subsequent comparison. For example, if the host computer generates a control command to have the controlled terminal turn on a control switch, and it detects that pins 2 and 4 of relay RL3 are short-circuited, it indicates that the controlled terminal has turned on the control switch. In this case, the control command and the control signal produce the same result, and the control command does not need to be reissued. Pin 5 of relay RL3 serves as the 12V voltage output, and pin 5 of relay RL3 and the ground wire are connected to pins 5 and 8 of the RJ45 interface, respectively. The 12V voltage output of relay RL3 is simultaneously transmitted to the host computer, allowing the host computer to determine whether the 12V voltage output of relay RL3 is effective.

[0042] There are two control methods for the controlled terminal: one is to control it with switch output, such as controlling the controlled terminal to start working through an external relay; the other is to control it with 12V voltage output, such as using the 12V voltage output of a relay to start a loud alarm or signal transmitter, etc., which allows users to apply it flexibly.

[0043] Furthermore, the accompanying drawings are merely illustrative of the processes included in the methods according to exemplary embodiments of this application and are not intended to be limiting. Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0044] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is defined only by the appended claims.

Claims

1. A terminal control method for large-area locations, characterized in that, The system involves a host computer, several sensing terminals, and several controlled terminals. The sensing terminals are all connected to the host computer, and the controlled terminals within the detection area of ​​the sensing terminals are connected to the sensing terminals. The terminal control method includes the following steps: The sensing terminal detects at least one variable in real time and transmits the variable value to the host computer. The host computer determines whether the variable values ​​transmitted from all sensor terminals are abnormal; If an abnormal variable value is detected, a control command is sent to the corresponding sensing terminal. The control command is used to control the operation of the controlled terminal corresponding to the variable. After receiving the control command, the sensing terminal sends a control signal to the controlled terminal; Each of the sensing terminals has a first port and a second port connected in parallel. The host computer has a first port and is connected to the first port of the sensing terminal through the first port. The controlled terminal has a second port and is connected to the second port of the sensing terminal through the second port. The type of the first port is different from the type of the second port. The first port and the second port are physically connected in parallel so that the host computer can synchronously know whether the 12V voltage output has taken effect and synchronously know the corresponding control signal status.

2. The large-area terminal control method as described in claim 1, characterized in that, The control signal sent by the sensing terminal is also transmitted to the host computer. If the variable value is found to be abnormal, the host computer generates a control command. The control command is compared with the control signal transmitted by the sensing terminal. If the effect of the control signal on the controlled terminal is the same as the effect of the control command on the controlled terminal, the control command is canceled. If they are different, the control command is sent to the corresponding sensing terminal.

3. The large-area terminal control method as described in claim 1, characterized in that, The first port and the second port each have 8 pins, and the 8 pins of the first port and the 8 pins of the second port are connected in parallel in a one-to-one correspondence.

4. The large-area terminal control method as described in claim 3, characterized in that, The first port is an RJ45 interface, and the second port is two sets of 4-pin Phoenix ports; or, the second port is an RJ45 interface, and the first port is two sets of 4-pin Phoenix ports.

5. The large-area terminal control method as described in claim 4, characterized in that, In the RJ45 interface, pins 1 and 2 are used for RS485 communication, pins 4 and 7 are used for 12V voltage input, pins 5 and 8 are used for 12V voltage output, and pins 3 and 6 are used for switch output. In one set of 4-pin Phoenix ports, two pins are connected in parallel with pins 1 and 2 of the RJ45 interface, and the other two pins are connected in parallel with pins 4 and 7 of the RJ45 interface. In another set of 4-pin Phoenix ports, two pins are connected in parallel with pins 5 and 8 of the RJ45 interface, and the other two pins are connected in parallel with pins 3 and 6 of the RJ45 interface.

6. The large-area terminal control method as described in claim 5, characterized in that, The sensing terminal includes a main control unit and a relay. The relay is electrically connected to the main control unit. The relay is used to output two switching signals and a 12V voltage. The voltage output terminal of the relay is connected to pins 5 and 8 of the RJ45 interface, and the switching output terminal of the relay is connected to pins 3 and 6 of the RJ45 interface.

7. The large-area terminal control method as described in claim 6, characterized in that, The sensing terminal also includes a display unit, a sensing unit, and a sound unit, which are electrically connected to the main control unit.

8. The large-area terminal control method as described in claim 6, characterized in that, The sensing terminal also includes an encryption / decryption unit, which is electrically connected to the main control unit; the data transmitted between the host computer and the sensing terminal is encrypted using SM4, and the encryption / decryption unit is used to perform SM4 encryption and SM4 decryption.

9. The large-area terminal control method as described in claim 1, characterized in that, During the initial power-on initialization, the sensing terminal uploads a handshake packet containing the sensing terminal ID to the host computer. The host computer determines whether it is a legitimate terminal based on the handshake packet, identifies the sensing terminal type, sets the corresponding parameters, and outputs the correct operating voltage to the sensing terminal.

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