An X-ray security inspection machine and a communication control device for a luggage system

Abstract

The present invention discloses a communication control device for an X-ray security inspection machine and a luggage system, which includes a first control module and a second control module; the first control module includes an MCU main control unit, a serial communication unit one, a serial communication unit two, an active signal input unit, a working mode selection unit, a status display unit, a data storage unit, a liquid crystal display unit, a download interface unit and a digital output unit; the second control module includes a serial communication unit three, a serial communication unit four, a passive signal input unit and an Ethernet communication unit. By using the present invention, the X-ray security inspection machine can be provided with multiple information communication and control methods, and can be applied to different actual scenarios in combination with the X-ray security inspection machine, enriching the functions of the security inspection equipment and expanding the application scope of the security inspection equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of security inspection, and particularly relates to a communication control device for an X-ray security inspection machine and a baggage system. Background Art

[0002] In recent years, with the rapid development of the national civil aviation industry, there are more and more manufacturers of airport security and conveying systems. With the gradual maturity of the application of big data, the requirements of airport information systems are becoming more and more complex. Security inspection equipment and external baggage systems perform package barcode, image information interaction, mutual monitoring of operating states, and logical control. Due to possible differences in electrical signals (such as active signals, passive signals, etc.) and information communication methods (such as RS323 method, RS422 method, etc.) of different manufacturers, the communication interface methods do not match, which requires security inspection equipment to be compatible with different communication interfaces and methods.

[0003] At present, the use of security inspection equipment in some airports is adjusted in different regional locations according to the off-peak and peak seasons. This requires security inspection equipment to be compatible with the current main usage scenarios and methods, provide a more flexible and convenient mode switching method, and not require rewriting of internal logic programs due to regional location adjustments. Based on the above requirements, security inspection equipment needs to have multi-channel information communication capabilities and complex logical control capabilities. Therefore, security inspection equipment needs to provide flexible communication methods, adjustable working modes, rich system functions, and a clear status display function that can increase debugging convenience. However, there is currently a lack of security inspection equipment that can meet these functions. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention aims to provide a communication control device for an X-ray security inspection machine and a baggage system.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An anti - theft inspection machine and luggage system communication control device, comprising a first control module and a second control module; the first control module includes an MCU main control unit, a serial communication unit one, a serial communication unit two, an active signal input unit, a working mode selection unit, a status display unit, a data storage unit, a liquid crystal display unit, a download interface unit and a digital output unit; the second control module includes a serial communication unit three, a serial communication unit four, a passive signal input unit and an Ethernet communication unit; the MCU main control unit is electrically connected to the serial communication unit one, the serial communication unit two, the active signal input unit, the working mode selection unit, the status display unit, the data storage unit, the liquid crystal display unit, the download interface unit and the digital output unit respectively; the serial communication unit three, the serial communication unit four, the passive signal input unit and the Ethernet communication unit are connected to the MCU main control unit through connectors respectively; the serial communication unit one and the serial communication unit two are used for communicating with the anti - theft inspection machine, and the serial communication unit three and the serial communication unit four are used for communicating with an external luggage system.

[0007] Further, the first control module further includes a power voltage unit, and the power voltage unit provides power voltages for the MCU main control unit, the serial communication unit one, the serial communication unit two, the serial communication unit three, the serial communication unit four, the active signal input unit, the working mode selection unit, the status display unit, the data storage unit, the liquid crystal display unit, the download interface unit of the first control module and the digital output unit, the passive signal input unit and the Ethernet communication unit of the second control module respectively.

[0008] Further, the MCU main control unit includes a single - chip microcomputer and its peripheral circuit. The single - chip microcomputer integrates multiple communication methods such as USART, IIC and SPI, multiple timers and has NOR FLASH and NAND FLASH memories.

[0009] Further, the serial communication unit one, the serial communication unit two, the serial communication unit three and the serial communication unit four all adopt a full - duplex communication standard mode compatible with RS232 and RS422.

[0010] Furthermore, the first serial communication unit, the second serial communication unit, the third serial communication unit, and the fourth serial communication unit are all composed of an RS232 level conversion chip, an RS422 transceiver, a Schottky double diode, and several bidirectional TVS transient suppression diodes; the RS232 level conversion chip is used to perform level conversion on the TTL level signal from the MCU main control unit, and the negative logic RS232C level signal in the serial transmission mode after conversion is led out from pin 1 of the connector X1; the RS422 transceiver is used to perform level conversion on the TTL level signal from the MCU main control unit, and the RS422 level signal in the differential transmission mode after conversion is led out from pins 3 and 4 of the connector X2; the RS232 level conversion chip is also used to perform level conversion on the negative logic RS232C level signal in the serial transmission mode from pin 2 of the connector X1, and the TTL level signal after conversion is input through pin 2 of the Schottky double diode and output through pin 3 of the Schottky double diode and then input into the MCU main control unit; the RS422 transceiver is also used to perform level conversion on the RS422 level signal in the differential transmission mode from pins 1 and 2 of the connector X2, and the TTL level signal after conversion is input through pin 2 of the Schottky double diode D1 and output through pin 3 of the Schottky double diode D1 and then input into the MCU main control unit; bidirectional TVS transient suppression diodes are connected in parallel on the cables between the RS232 level conversion chip and the connector X1 and between the RS422 transceiver and the connector X2.

[0011] Further, the active signal input unit is composed of an optocoupler U4, a terminal block J1, and a terminal block J2; the positive terminal DC5V of the voltage signal from the outside is connected to pin 1 of the connector X3, and after passing through pins 1 and 2 of the terminal block J1, it flows through the light emitting source end of the optocoupler U4 and finally connects to GND through pin 3 of the connector X3 to form a voltage loop; the signal at the light receiving end of the isolated output end of the optocoupler U4 is input into the PE1 pin of the MCU main control unit after RC filtering; the positive terminal DC24V of the voltage signal from the outside is connected to pin 2 of the connector X3, and after passing through pins 3 and 2 of the terminal block J1, it flows through the light emitting source end of the optocoupler U4 and finally passes through pins 1 and 2 of the terminal block J2 and then connects to GND through pin 3 of the connector X3 to form a voltage loop; the signal at the light receiving end of the isolated output end of the optocoupler U4 is input into the PE1 pin of the MCU main control unit after RC filtering.

[0012] Further, the working mode selection unit is implemented by pulling up or pulling down two general-purpose IO pins of the MCU main control unit, and the MCU main control unit determines the current working mode by sensing the high and low level combinations of the two general-purpose IO pins.

[0013] Further, the digital output unit consists of a power driver U5 and an isolation relay K1; the digital output signal from the MCU main control unit drives the coil of the isolation relay K1 through the power driver U5, and the contact of the isolation relay K1 is led out as the isolated switch signal through the terminal X4.

[0014] Further, the passive signal input unit consists of a Schottky diode D3 and a unidirectional TVS transient suppression diode T7; one wire of the external passive signal is docked with the pin 1 of the connector X5, and the other wire is connected to GND. When the external passive signal is activated, the signal at the pin 1 of the connector X5 is short-circuited to GND, and the power supply voltage flows out through the connection of the pin 1 of X5 to form a closed loop; the anode voltage of the Schottky diode D3 is input to the PF6 pin of the MCU main control unit after RC filtering; the unidirectional TVS transient suppression diode T7 clamps the voltage on the path at a pre-defined value.

[0015] Further, Ethernet is used to form a network with a remote workstation and interact with the remote workstation.

[0016] The beneficial effects of the present invention are as follows: Using the present invention as the communication control device between the security inspection machine and the luggage system can enable the security inspection machine to have multiple information communication and control methods, and be applied to different actual scenarios in combination with the security inspection machine, enriching the functions of the security inspection equipment and expanding the application scope of the security inspection equipment. In addition, the present invention not only displays all signals through indicator lights, but also performs real-time visual display and recording through a display screen, improving the applicability of the communication control device. The staff can switch the working mode, collect external different mode signals, and network the equipment through simple operations, improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the principle of the communication control device in Embodiment 1 of the present invention;

[0018] Figure 2 It is a schematic diagram of the working process of the system in Embodiment 2 of the present invention;

[0019] Figure 3 It is a schematic diagram of the circuit structure of the serial communication unit in Embodiment 3 of the present invention;

[0020] Figure 4 It is a schematic diagram of the circuit structure of the active signal input unit in Embodiment 3 of the present invention;

[0021] Figure 5 It is a schematic diagram of the circuit structure of the working mode selection unit in Embodiment 3 of the present invention;

[0022] Figure 6 It is a schematic diagram of the circuit structure of the status display unit in Embodiment 3 of the present invention;

[0023] Figure 7 It is a schematic circuit diagram of the digital output unit in Embodiment 3 of the present invention;

[0024] Figure 8 It is a schematic circuit diagram of the passive signal input unit in Embodiment 3 of the present invention;

[0025] Figure 9 It is a schematic circuit diagram of the power supply voltage unit in Embodiment 3 of the present invention. Detailed implementation manners

[0026] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and gives detailed implementation manners and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0027] Embodiment 1

[0028] This embodiment provides a communication control device for an X-ray security inspection machine and a luggage system. As Figure 1 shown, it includes a first control module and a second control module; the first control module includes an MCU main control unit, a serial communication unit 1, a serial communication unit 2, an active signal input unit, a working mode selection unit, a status display unit, a data storage unit, a liquid crystal display unit, a download interface unit, and a digital output unit; the second control module includes a serial communication unit 3, a serial communication unit 4, a passive signal input unit, and an Ethernet communication unit; the MCU main control unit is electrically connected to the serial communication unit 1, the serial communication unit 2, the active signal input unit, the working mode selection unit, the status display unit, the data storage unit, the liquid crystal display unit, the download interface unit, and the digital output unit respectively; the serial communication unit 3, the serial communication unit 4, the passive signal input unit, and the Ethernet communication unit are connected to the MCU main control unit through connectors respectively; the serial communication unit 1 and the serial communication unit 2 are used for communicating with the X-ray security inspection machine, and the serial communication unit 3 and the serial communication unit 4 are used for communicating with an external luggage system.

[0029] It should be noted that the first control module and the second control module are connected through connectors, which can be correspondingly expanded according to different requirements, are flexible and convenient, can save installation space, and can also save cost.

[0030] In this embodiment, the first control module further includes a power supply voltage unit, which provides power supply voltages for the MCU main control unit, the first serial communication unit, the second serial communication unit, the third serial communication unit, the fourth serial communication unit, the active signal input unit, the working mode selection unit, the status display unit, the data storage unit, the liquid crystal display unit, the download interface unit of the first control module, and the switch quantity output unit, the passive signal input unit, and the Ethernet communication unit of the second control module.

[0031] In this embodiment, the MCU main control unit includes a single-chip microcomputer and its peripheral circuits. The single-chip microcomputer integrates multiple communication methods such as USART, IIC, SPI, multiple timers, and has NOR FLASH and NAND FLASH memories, etc.

[0032] In this embodiment, the first serial communication unit, the second serial communication unit, the third serial communication unit, and the fourth serial communication unit adopt a full-duplex communication standard mode compatible with RS232 and RS422, and do not require switching of the communication mode through the instructions of the MCU main control unit. Users can directly connect to the communication interface of the security inspection equipment according to the actual situation. It should be noted that the above communication control device for the security inspection machine and the luggage system is the control device inside the security inspection machine. The first serial communication unit and the second serial communication unit are the interfaces for internal communication of the security inspection machine, and the third serial communication unit and the fourth serial communication unit are the interfaces for communicating with the external luggage system.

[0033] In this embodiment, the active signal input unit has status indicators with independent paths, and at the same time uses an optocoupler chip for electrical isolation to ensure signal stability. The active input signal unit can respectively meet the effective input methods of high-level DC5V and DC24V.

[0034] In this embodiment, the working mode selection unit is implemented by pulling up or pulling down two general-purpose IO pins of the MCU main control unit. The MCU main control unit determines the current working mode by sensing the high and low level combinations of the two general-purpose IO pins during the startup process.

[0035] In this embodiment, the status display unit is used to give corresponding LED status prompts for different working modes, abnormal processes, and faults.

[0036] In this embodiment, the data storage unit selects EEPROM (electrically erasable programmable read-only memory), which has the function of preserving data when power is off, and is used to store communication parameters (such as IP address, subnet mask, baud rate) and fault codes, etc. The data storage unit and the MCU main control unit perform data access through the IIC communication method.

[0037] In this embodiment, the liquid crystal display unit is used to display data such as the current working mode, the signal status of the input and output units, the real-time status of packages in the far and near channels of the security inspection equipment, and the current device IP address. A parallel communication method is adopted between the liquid crystal display unit and the MCU main control unit.

[0038] In this embodiment, the download interface unit includes a standard SW-DP interface, which is used to download the program of the single-chip microcomputer in the MCU main control unit and perform online debugging.

[0039] In this embodiment, the digital output unit has status indicator lights with independent paths, and at the same time, the chip can be used to drive a relay to realize the output of digital signals. The digital signals are used to output start-stop signals, emergency stop signals, security inspection equipment scanning status, package interpretation result status, and remote power-on / off signals to the security inspection machine, etc.

[0040] In this embodiment, the Ethernet communication unit includes an Ethernet controller, an isolation transformer, and an Ethernet connector. The Ethernet controller is electrically connected through the isolation transformer and the Ethernet connector. Ethernet is mainly used to form a network with a remote workstation and interact with the remote workstation for remote power-on / off, device-related status signals, and security inspection image information.

[0041] Embodiment 2

[0042] This embodiment provides a working method for the communication control device of the security inspection machine and the luggage system described in Embodiment 1, as Figure 2 shown. The specific process is as follows:

[0043] (1) After power-on, perform self-check first, that is, the single-chip microcomputer in the MCU main control unit determines whether the EEPROM is working properly by writing the fixed data W_Data to the specific address of the EEPROM, and at the same time reading the data R_Data at this address and comparing it with the written data W_Data.

[0044] (2) If it is abnormal, the fault status indicator light in the status display unit is always on to prompt, and no operation is performed; if it is normal, the MCU main control unit samples the pin level combination in the working mode selection unit to determine whether the working mode is set.

[0045] (3) If there is no working mode corresponding to the pin level combination, the fault status indicator light in the status display unit flashes to prompt, and the MCU main control unit continuously samples in the current state; if there is a working mode corresponding to the pin level combination, the MCU main control unit enters this working mode, and at the same time, the corresponding working mode indicator light in the status display unit is lit.

[0046] Embodiment 3

[0047] This embodiment provides an application example of Embodiment 1.

[0048] In this embodiment, an 8 MHz external crystal oscillator in the MCU main control unit provides a stable clock oscillation signal for the single-chip microcomputer, and the outside of the single-chip microcomputer is filtered through ceramic capacitors. In this embodiment, the single-chip microcomputer can use the STM32F103ZET6 with 144 pins.

[0049] Please refer to Figure 3 , the first serial communication unit, the second serial communication unit, the third serial communication unit, and the fourth serial communication unit are all composed of an RS232 level conversion chip U1, an RS422 transceiver U2, a Schottky dual diode D1, and bidirectional TVS transient suppression diodes T1-T6. The TTL level signal USART4_TX from the MCU main control unit is output through two paths. One path is level-converted by the RS232 level conversion chip U1, and the negative logic RS232C level signal in the serial transmission mode after conversion is led out from pin 1 of the X1 connector; the other path is level-converted by the RS422 transceiver U2, and the RS422 level signal in the differential transmission mode after conversion is led out from pins 3 and 4 of the X2 connector. The negative logic RS232C level signal in the serial transmission mode from pin 2 of the X1 connector is level-converted by the RS232 level conversion chip U1, and the level-converted TTL level signal is input through pin 2 of the Schottky dual diode D1 and output through pin 3 and then input to the MCU main control unit; the RS422 level signals in the differential transmission mode from pins 1 and 2 of the X2 connector are level-converted by the RS422 transceiver U2, and the level-converted TTL level signals are input through pin 2 of the Schottky dual diode D1 and output through pin 3 and then input to the MCU main control unit. The bidirectional TVS transient suppression diodes T1-T6 are connected in parallel on the cables between the RS232 level conversion chip U1 and the X1 connector and between the RS422 transceiver U2 and the X2 connector, and both clamp the voltage on the path at a preset value to prevent components from being damaged due to surge pulses. The RS232 level conversion chip U1 can use the SP3232EC chip, the RS422 transceiver U2 can use the SP3490ECN chip, the Schottky dual diode D1 can use the BAT54A chip, the bidirectional TVS transient suppression diodes T1-T2 can use the P4SMA18CA, and the bidirectional TVS transient suppression diodes T3-T6 can use the P4SMA6.8CA.

[0050] Please refer to Figure 4 , the active signal input unit is composed of an optocoupler U4, a terminal block J1, and a terminal block J2. The active signal input unit in this embodiment can meet the effective input modes of high levels DC5V and DC24V. The explanations are as follows:

[0051] 1. External active signal DC5V and GND.

[0052] The positive terminal of the external voltage signal DC5V is connected to pin 1 of connector X3. After passing through pins 1 and 2 of terminal block J1, it flows through the light-emitting source terminal of optocoupler U4, and finally is connected to GND through pin 3 of connector X3, forming a voltage loop. The signal at the light-receiving end of the isolated output is input to the PE1 pin of the MCU main control unit after RC filtering for data acquisition.

[0053] 2. External active signal DC24V and GND.

[0054] The positive terminal of the external voltage signal DC24V is connected to pin 2 of connector X3. After passing through pins 3 and 2 of terminal block J1, it flows through the light-emitting source terminal of optocoupler U4, and finally is connected to GND through pins 1 and 2 of terminal block J2 and then through pin 3 of connector X3, forming a voltage loop. The signal at the light-receiving end of the isolated output is input to the PE1 pin of the MCU main control unit after RC filtering for data acquisition.

[0055] Figure 4 In the figure, light-emitting diode H1 is connected in series to the light-emitting source terminal of optocoupler U4 as an indicator light for the operation of the optocoupler on this path. Schottky diode D2 is connected in parallel to the light-emitting source terminal of the optocoupler to prevent damage to the optocoupler caused by reverse connection of the positive and negative voltage of the external voltage signal. The optocoupler can be selected as TLP293-4, and the terminal block can be selected as a 2.54mm terminal block, and is selected through the way of wire caps.

[0056] Please refer to Figure 5 , the working mode selection unit consists of terminal block J3 and pull-up resistors. The level signal of pin 2 of terminal block J3 is input to the PA0 pin of the MCU main control unit. The terminal block J3 can be selected as a 2.54mm terminal block, and is selected through the way of wire caps.

[0057] Please refer to Figure 6 , the status display unit consists of light-emitting diode LED and voltage-dividing resistors. The +3.3V power supply voltage signal enters the PG7 pin of the MCU main control unit after passing through the resistor and light-emitting diode LED. The light-emitting diode LED is connected in series in the path as an indicator light for path selection.

[0058] In this embodiment, the data storage unit selects an external memory and communicates with the MCU main control unit through IIC. Here, the data storage unit can be selected as AT24C04.

[0059] In this embodiment, the liquid crystal display unit selects an LCD screen. The communication method between the liquid crystal display unit and the MCU main control unit is the parallel bus method. The liquid crystal display unit selects a display method with blue background and white characters that is more suitable for use in a relatively dark environment, and performs specific layout display according to different working modes.

[0060] In this embodiment, the download interface unit selects a 4-wire standard SW-DP interface for downloading the program of the single-chip microcomputer in the MCU main control unit and for on-line debugging.

[0061] Please refer to Figure 7 , the digital output unit consists of a power driver U5 and an isolation relay K1. The digital output signal PD8 from the MCU main control unit drives the coil of the isolation relay K1 through the power driver U5, and the contact of K1 is led out as the isolated switch signal by the terminal X4. As Figure 7 shown, the light-emitting diode H3 is connected in parallel with the K1 coil as an indicator of the action of K1. The power driver U5 can adopt a transistor array ULN2803A, and the isolation relay K1 can adopt G6DN-1A-4.5V.

[0062] Please refer to Figure 8 , the passive signal input unit consists of a Schottky diode D3, a unidirectional TVS transient suppression diode T7, and an RC filter circuit. One wire of the external passive signal is connected to pin 1 of the connector X5, and the other wire is connected to the GND inside the board. After the external passive signal is activated, the signal at pin 1 of the connector X5 is short-circuited to GND, and the +3.3V power supply voltage flows out through the resistor, diode, etc. and finally through pin 1 of the connected X5 to form a closed loop. The anode voltage of the Schottky diode D3 is input to the PF6 pin of the MCU main control unit after being filtered by the RC filter. Figure 8 In, the light-emitting diode H4 is connected in series in the power supply voltage path as an indicator of the action of this path. The unidirectional TVS transient suppression diode T7 clamps the voltage on the path at a preset value to prevent components from being damaged due to surge pulses. Here, the TVS transient suppression diode can select P4SMA6.8A.

[0063] In this embodiment, the Ethernet unit includes an Ethernet controller, an isolation transformer, and an Ethernet connector. The communication method between the Ethernet controller and the MCU main control unit selects a faster parallel data bus. The Ethernet controller can select the 80-pin W5100, and the Ethernet connector can be selected as the 13F-60FGYDPNW2NL integrated with an isolation transformer.

[0064] Please refer to Figure 9 , the power supply voltage unit consists of an isolated regulated power supply module U6 and a linear voltage regulator chip U7. The external voltage signal enters the input end of the isolated regulated power supply module U6 after passing through a fuse and a bidirectional TVS transient suppression diode. The isolated output voltage provides a +5V power supply voltage through the wiring terminal J4 device. The +5V power supply voltage is input to the linear voltage regulator chip U7 for step-down conversion, and the converted +3.3V voltage provides power for subsequent devices. As Figure 9As shown, the light-emitting diode H5 is connected in series to the +3.3V power supply path and serves as an indicator for the operation of this path. The bidirectional TVS transient suppression diode functions as a voltage clamp to prevent components from being damaged due to surge pulses. The fuse F1 provides overload protection. The isolated regulated power supply module U6 can be selected as B2405S-2WR2, the linear voltage regulator chip U7 can be selected as LM1117-3.3V, the bidirectional TVS transient suppression diode T8 can be selected as P4SMA27A, and the bidirectional TVS transient suppression diode T9 can be selected as P4SMA6.8A.

[0065] For those skilled in the art, various corresponding changes and deformations can be made based on the above technical solutions and concepts, and all such changes and deformations should be included within the protection scope of the claims of the present invention.

Claims

1. A communication control device for an X-ray security inspection machine and a luggage system, characterized in that, it includes a first control module and a second control module; the first control module includes an MCU main control unit, a serial communication unit 1, a serial communication unit 2, an active signal input unit, a working mode selection unit, a status display unit, a data storage unit, a liquid crystal display unit, a download interface unit, and a digital output unit; the second control module includes a serial communication unit 3, a serial communication unit 4, a passive signal input unit, and an Ethernet communication unit; the MCU main control unit is electrically connected to the serial communication unit 1, the serial communication unit 2, the active signal input unit, the working mode selection unit, the status display unit, the data storage unit, the liquid crystal display unit, the download interface unit, and the digital output unit respectively; the serial communication unit 3, the serial communication unit 4, the passive signal input unit, and the Ethernet communication unit are connected to the MCU main control unit through connectors respectively; the serial communication unit 1 and the serial communication unit 2 are used to communicate with the X-ray security inspection machine, and the serial communication unit 3 and the serial communication unit 4 are used to communicate with an external luggage system; the first control module further includes a power voltage unit, and the power voltage unit provides power voltages for the MCU main control unit, the serial communication unit 1, the serial communication unit 2, the serial communication unit 3, the serial communication unit 4, the active signal input unit, the working mode selection unit, the status display unit, the data storage unit, the liquid crystal display unit, the download interface unit of the first control module, and the digital output unit, the passive signal input unit, and the Ethernet communication unit of the second control module; the MCU main control unit includes a single-chip microcomputer and its peripheral circuits, and the single-chip microcomputer integrates multiple communication methods of USART, IIC, and SPI, multiple timers, and has NOR FLASH and NAND FLASH memories; the serial communication unit 1, the serial communication unit 2, the serial communication unit 3, and the serial communication unit 4 all adopt a full-duplex communication standard mode compatible with RS232 and RS422; the serial communication unit 1, the serial communication unit 2, the serial communication unit 3, and the serial communication unit 4 are all composed of an RS232 level conversion chip, an RS422 transceiver, a Schottky diode, and several bidirectional TVS transient voltage suppressors; the RS232 level conversion chip is used to perform level conversion on the TTL level signal from the MCU main control unit, and the negative logic RS232C level signal in the serial transmission mode after conversion is led out from pin 1 of the connector X1; the RS422 transceiver is used to perform level conversion on the TTL level signal from the MCU main control unit, and the RS422 level signal in the differential transmission mode after conversion is led out from pins 3 and 4 of the connector X2; the RS232 level conversion chip is also used to perform level conversion on the negative logic RS232C level signal in the serial transmission mode from pin 2 of the connector X1, the TTL level signal after conversion is input through pin 2 of the Schottky diode, and after being output through pin 3 of the Schottky diode, it is input into the MCU main control unit; The RS422 transceiver is also used to perform level conversion on the RS422 level signals in differential transmission mode from pins 1 and 2 of connector X2. The converted TTL level signals are input through pin 2 of Schottky double diode D1, output through pin 3 of Schottky double diode D1, and then input into the MCU main control unit; Bidirectional TVS transient suppression diodes are connected in parallel on the cable between the RS232 level conversion chip and connector X1 and on the cable between the RS422 transceiver and connector X2; The active signal input unit consists of optocoupler U4, terminal block J1, and terminal block J2; The positive terminal DC5V of the external voltage signal is connected to pin 1 of connector X3. After passing through pins 1 and 2 of terminal block J1, it flows through the light emitting source end of optocoupler U4, and finally connects to GND through pin 3 of connector X3 to form a voltage loop; The signal at the light receiving end of the isolation output of optocoupler U4 is input into the PE1 pin of the MCU main control unit after RC filtering; The positive terminal DC24V of the external voltage signal is connected to pin 2 of connector X3. After passing through pins 3 and 2 of terminal block J1, it flows through the light emitting source end of optocoupler U4, and finally passes through pins 1 and 2 of terminal block J2 and then connects to GND through pin 3 of connector X3 to form a voltage loop; The signal at the light receiving end of the isolation output of optocoupler U4 is input into the PE1 pin of the MCU main control unit after RC filtering; The working mode selection unit is implemented by pulling up or pulling down two general-purpose IO pins of the MCU main control unit. The MCU main control unit determines the current working mode by sensing the high and low level combinations of the two general-purpose IO pins; The digital output unit consists of power driver U5 and isolation relay K1; The digital output signal from the MCU main control unit drives the coil of isolation relay K1 through power driver U5. The contact of isolation relay K1 is led out as an isolated switch signal through terminal X4; The passive signal input unit consists of Schottky diode D3 and unidirectional TVS transient suppression diode T7; One wire of the external passive signal is connected to pin 1 of connector X5, and the other wire is connected to GND. When the external passive signal is activated, the signal at pin 1 of connector X5 is shorted to GND, and the power supply voltage flows out through the connection of X5 pin 1 to form a closed loop; The anode voltage of Schottky diode D3 is input into the PF6 pin of the MCU main control unit after RC filtering; The unidirectional TVS transient suppression diode T7 clamps the voltage on the path to a preset value.

2. The communication control device for the security inspection machine and luggage system according to claim 1, characterized in that, Ethernet is used to form a network with a remote workstation and interact with the remote workstation.

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