Intelligent control communication control panel and automatic tracking camera system

Abstract

The utility model provides an intelligent control communication control board and an automatic tracking camera system, the intelligent control communication control board comprises a master control module, a network communication module, an RS485 communication module and a power supply module, the network communication module and the RS485 communication module are both in communication connection with the master control module, and the power supply module is in communication connection with the RS485 communication module. The power supply module supplies power to the main control module, the network communication module and the RS485 communication module. The automatic tracking camera system comprises a holder and a camera, the intelligent control communication control panel is connected with the automatic tracking camera system through an RS485 interface, the intelligent control communication control panel is connected with the PLC through a network interface, and the intelligent control communication control panel is further connected with an upper computer through a network interface. The utility model has the beneficial effects of supporting a network communication function, supporting an upper computer to modify automatic tracking parameters, supporting an on-line downloading and upgrading function, and supporting wide voltage input and automatic tracking camera system control.

Description

Technical Field

[0001] This utility model belongs to the field of video surveillance, and in particular relates to an intelligent communication control board and an automatic tracking camera system. Background Technology

[0002] As a key node in international trade and logistics, the efficiency and safety of port operations are of paramount importance. As an important port industry, the stability, accuracy, and intelligence of the monitoring system for areas such as ship unloaders directly affect the port's operational efficiency and safety level. It is necessary to closely monitor these areas to effectively ensure safe and orderly production, promptly detect abnormal situations, and nip abnormal processes in the bud.

[0003] Existing monitoring systems use RS485 as the communication interface to communicate with the PLC and control the camera system to track the controlled object. However, existing systems have the following limitations:

[0004] 1. Communication interface limitations: Due to the lack of a network interface, an external Modbus TCP to 485 converter is required, which increases the system complexity and cost.

[0005] 2. Inconvenient debugging: On-site operation is required during the debugging phase, but some sites do not allow personnel to operate on the main machine, resulting in low debugging efficiency.

[0006] The monitoring system for the port ship unloading machine operation area urgently needs a controller with a network interface to assist in realizing the automatic tracking function of the camera system. Utility Model Content

[0007] In view of this, the present invention aims to provide an intelligent communication control board and an automatic tracking camera system to solve at least one of the problems existing in the prior art.

[0008] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0009] In a first aspect, this utility model provides an intelligent control communication control board, including a main control module, a network communication module, an RS485 communication module, and a power supply module. The network communication module and the RS485 communication module are both communicatively connected to the main control module. The power supply module provides power to the main control module, the network communication module, and the RS485 communication module. The main control module includes a microcontroller and a filter circuit, a clock circuit, a reset circuit, a BOOT circuit, and an SWD interface circuit connected thereto. The RS485 communication module includes six identical communication sub-modules, all of which are connected to the main control module.

[0010] Furthermore, the filter circuit includes capacitors C10, C11, C12, C13, C14, C15, C16, C23, C24, C31, C32, and resistor R45. Capacitors C10, C11, C12, C13, C14, C15, and C16 are connected in parallel, with one end connected to a 3.3V power supply and the other end grounded. Capacitors C23 and C24 are connected in parallel, with one end connected to the VREF+ and VDDA pins of the microcontroller and the other end connected to the pull-up resistor R45. One end of capacitor C31 is connected to the VCAP_1 pin of the microcontroller and the other end grounded. One end of capacitor C32 is connected to the VCAP_2 pin of the microcontroller and the other end grounded.

[0011] Furthermore, the clock circuit includes a crystal oscillator X1, a capacitor C17, and a capacitor C18. One end of the capacitor C17 is connected to one end of the crystal oscillator X1, and the other end of the capacitor C17 is grounded. One end of the capacitor C18 is connected to the other end of the crystal oscillator X1, and the other end of the capacitor C18 is grounded. The two ends of the crystal oscillator X1 are respectively connected to the OSC_IN pin and the OSC_OUT pin of the microcontroller.

[0012] Furthermore, the reset circuit includes a resistor R28 and a capacitor C19. One end of the resistor R28 is connected to one end of the capacitor C19 and the NRST pin of the microcontroller. The other end of the resistor R28 is connected to a 3.3V power supply, and the other end of the capacitor C19 is grounded.

[0013] Furthermore, the BOOT circuit includes resistors R36 and R40. One end of resistor R36 is connected to the BOOT0 pin of the microcontroller, and the other end of resistor R36 is grounded. One end of resistor R40 is connected to the BOOT1 pin of the microcontroller, and the other end of resistor R40 is grounded.

[0014] Furthermore, the SWD interface circuit includes connector H1, resistor R46, and resistor R47. Pin 1 of connector H1 is grounded via a diode, pin 4 of connector H1 is grounded, pin 2 of connector H1 is connected to the SWDIO pin of the microcontroller and pull-up resistor R46, and pin 3 of connector H1 is connected to the SWDCLK pin of the microcontroller and pull-down resistor R47.

[0015] Furthermore, the network communication module includes an Ethernet PHY and its peripheral circuits. The peripheral circuits include a clock circuit, a filter circuit, pull-up resistors, pull-down resistors, and an RJ45 interface. The Ethernet PHY is connected to a microcontroller.

[0016] Furthermore, the RS485 communication submodule includes an RS485 transceiver and its peripheral circuits, the peripheral circuits including capacitors, resistors, Zener diodes and fuses, and the RS485 transceiver is connected to a microcontroller.

[0017] Furthermore, the power module includes a DC-DC power chip and its peripheral circuits, the peripheral circuits including a fuse, a reverse polarity protection diode, and a filter circuit.

[0018] Secondly, based on the same concept, this utility model also provides an automatic tracking camera system, including a camera and a pan-tilt unit. The automatic tracking camera system is connected to an intelligent control communication control board via an RS485 interface. The intelligent control communication control board is connected to a PLC via a network interface. The intelligent control communication control board is also connected to a host computer via a network interface.

[0019] Compared with existing technologies, the intelligent communication control board and automatic tracking camera system described in this utility model have the following advantages:

[0020] (1) Supports network communication function: The industrial-grade Ethernet interface RJ45 is selected to ensure the stability and reliability of communication. This interface supports the common industrial communication protocol Modbus TCP.

[0021] (2) Support the host computer to modify the automatic tracking parameters: Develop a host computer operation interface with a simple and intuitive layout that is easy to operate.

[0022] (3) Supports online download and upgrade function: The main control module adopts a large-capacity Flash memory to store system control program and various functional module programs.

[0023] (4) Supports wide voltage input: A wide voltage input power module is selected, which can adapt to DC input voltages of 5-30V. The power module uses power conversion technology and voltage regulation circuits to convert the input voltage into a stable DC voltage, providing a reliable power supply for all components of the system. The power protection design uses fuses and reverse polarity protection diodes as the main protection components. The fuse plays the role of overcurrent protection in the circuit and can effectively cut off the faulty circuit in a short time. The reverse polarity protection diode is mainly used to prevent equipment damage caused by reverse connection of the positive and negative terminals of the power supply, and it utilizes the unidirectional conductivity of the diode. Electromagnetic compatibility design is adopted. In order to ensure that the system can operate normally in a wide voltage input environment and meet the electromagnetic compatibility requirements, filter circuits are set at the input and output terminals of the power supply to effectively suppress electromagnetic interference on the power line and improve the anti-interference capability of the system. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0025] Figure 1 This is a schematic diagram of the main control module of the intelligent control communication control board according to an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the network interface of the intelligent control communication control board according to an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of the power module of the intelligent control communication control board according to an embodiment of the present utility model;

[0028] Figure 4 This is a schematic diagram of the RS485 interface of the intelligent control communication control board described in this embodiment of the utility model.

[0029] Figure 5 This is a schematic diagram of the intelligent communication control board according to an embodiment of the present invention.

[0030] Figure 6 This is a block diagram of the system described in an embodiment of the present utility model. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] like Figures 1 to 6 As shown, an intelligent control communication control board includes a main control module, a network communication module, an RS485 communication module, and a power supply module. The network communication module and the RS485 communication module are both communicatively connected to the main control module. The power supply module provides power to the main control module, the network communication module, and the RS485 communication module. The main control module includes a microcontroller and connected filtering circuits, clock circuits, reset circuits, BOOT circuits, and SWD interface circuits. The RS485 communication module includes six identical communication sub-modules, all of which are connected to the main control module.

[0036] Advantages of this utility model:

[0037] (1) Supports network communication function: The industrial-grade Ethernet interface RJ45 is selected to ensure the stability and reliability of communication. This interface supports the common industrial communication protocol Modbus TCP.

[0038] (2) Support the host computer to modify the automatic tracking parameters: Develop a host computer operation interface with a simple and intuitive layout that is easy to operate.

[0039] (3) Supports online download and upgrade function: The main control module can use a large-capacity Flash memory to store system control program and various functional module programs.

[0040] (4) Supports wide voltage input: A wide voltage input power module is selected, which can adapt to DC input voltages of 5-30V. The power module uses power conversion technology and voltage regulation circuits to convert the input voltage into a stable DC voltage, providing a reliable power supply for all components of the system. The power protection design uses fuses and reverse polarity protection diodes as the main protection components. The fuse plays the role of overcurrent protection in the circuit and can effectively cut off the faulty circuit in a short time. The reverse polarity protection diode is mainly used to prevent equipment damage caused by reverse connection of the positive and negative terminals of the power supply, and it utilizes the unidirectional conductivity of the diode. Electromagnetic compatibility design is adopted. In order to ensure that the system can operate normally in a wide voltage input environment and meet the electromagnetic compatibility requirements, filter circuits are set at the input and output terminals of the power supply to effectively suppress electromagnetic interference on the power line and improve the anti-interference capability of the system.

[0041] In a preferred embodiment of this utility model, the filter circuit includes capacitors C10, C11, C12, C13, C14, C15, C16, C23, C24, C31, C32, and resistor R45. Capacitors C10, C11, C12, C13, C14, C15, and C16 are connected in parallel, with one end connected to a 3.3V power supply and the other end grounded. Capacitors C23 and C24 are connected in parallel, with one end connected to the VREF+ and VDDA pins of the microcontroller and the other end connected to the pull-up resistor R45. One end of capacitor C31 is connected to the VCAP_1 pin of the microcontroller and the other end grounded. One end of capacitor C32 is connected to the VCAP_2 pin of the microcontroller and the other end grounded. The clock circuit includes a crystal oscillator X1, capacitors C17 and C18. One end of capacitor C17 is connected to one end of crystal oscillator X1, and the other end of capacitor C17 is grounded. One end of capacitor C18 is connected to the other end of crystal oscillator X1, and the other end of capacitor C18 is grounded. The two ends of crystal oscillator X1 are connected to the OSC_IN and OSC_OUT pins of the microcontroller, respectively. The reset circuit includes a resistor R28 and a capacitor C19. One end of resistor R28 is connected to one end of capacitor C19 and the NRST pin of the microcontroller, and the other end of resistor R28 is connected to a 3.3V power supply. The other end of capacitor C19 is grounded. The BOOT circuit includes a resistor R36 and a resistor R40. One end of resistor R36 is connected to the BOOT0 pin of the microcontroller, and the other end of resistor R36 is grounded. One end of resistor R40 is connected to the BOOT1 pin of the microcontroller, and the other end of resistor R40 is grounded. The SWD interface circuit includes connector H1, resistor R46, and resistor R47. Pin 1 of connector H1 is grounded via a diode, pin 4 of connector H1 is grounded, pin 2 of connector H1 is connected to the SWDIO pin of the microcontroller and pull-up resistor R46, and pin 3 of connector H1 is connected to the SWDCLK pin of the microcontroller and pull-down resistor R47.

[0042] In a preferred embodiment of this invention, the network communication module includes an Ethernet PHY and its peripheral circuitry. The peripheral circuitry includes a clock circuit, a filter circuit, pull-up resistors, pull-down resistors, and an RJ45 interface. The Ethernet PHY is connected to a microcontroller. In this embodiment, the microcontroller sends data to and receives data from the host computer via the Ethernet PHY.

[0043] In this embodiment, the clock circuit includes a crystal oscillator X2, capacitors C29 and C30, and an inductor L1. Capacitors C29 and C30 are connected in parallel, with one end grounded and the other end connected to the VCC pin of crystal oscillator X2. The VCC pin of crystal oscillator X2 is connected to a 3.3V power supply through inductor L1. The GND pin of crystal oscillator X2 is grounded, and the OUT pin of crystal oscillator X2 is connected to the X1 pin of the main control chip. The filter circuit includes capacitors C6, C7, C8, C9, C20, C21, C22, C25, C26, C27, C28, C29, and C30. Capacitors C6, C7, C8, and C9 are connected in parallel. One end of the capacitor is connected to a 3.3V power supply, and the other end is grounded. Capacitors C20, C21, and C22 are connected in parallel, with one end connected to a 3.3V power supply and the other end grounded. Capacitors C25, C26, C27, and C28 are connected in parallel, with one end connected to the PFBIN and PFBOUT pins of the main control chip, and the other end grounded. The pull-up resistors include resistors R16, R17, R18, R19, R27, R29, R32, R34, R37, R39, R41, R30, R33, and R38. Resistors R16, R17, R18, and R19 are respectively connected to the main control chip and R... The TD+, TD-, RD+, and RD- pins of the RJ45 interface are connected as follows: resistors R27 and R29 are connected to the LED(GREEN)_A and LED(YELLOW)_A pins of the RJ45 interface, respectively; resistors R32, R34, R37, R39, and R41 are connected to the LED_LINK, LED_SPEED, LED_ACT, and NC pins of the main control chip, respectively; resistors R33 and R38 are connected to the MDIO and PWR_DOWM pins of the main control chip, respectively; one end of resistor R31 is connected to pull-up resistor R30, and the other end is connected to the RX_DV pin of the main control chip; the pull-down resistor includes an electrical... Resistors R23, R24, and R44 are connected to the TXD_2, TXD_3, and RBIAS pins of the main control chip, respectively. The TX_EN, TXD_0, TXD_1, RXD_0, RXD_1, and RX_DV pins of the main control chip are connected to the corresponding GPIO pins of the microcontroller via resistors. The MDC and RESET pins of the main control chip are connected to the corresponding GPIO pins of the microcontroller. The LED_LINK and LED_ACT pins of the main control chip are connected to the LED(GREEN)_K and LED(YELLOW)_K pins of the RJ45 interface.

[0044] In a preferred embodiment of this utility model, the RS485 communication submodule includes an RS485 transceiver and its peripheral circuits. The peripheral circuits include capacitors, resistors, Zener diodes, and fuses. The RS485 transceiver is connected to a microcontroller.

[0045] In this embodiment, the microcontroller sends data to and receives data from the camera via an RS485 transceiver. The RS485 transceiver's R, 2, DE, and D pins are connected to the corresponding GPIO pins of the microcontroller. The RS485 transceiver's B pin is connected to a pull-down resistor R1 and grounded via a Zener diode. The RS485 transceiver's A pin is connected to a pull-up resistor R3 and grounded via a Zener diode. Resistor R1 is connected to a 3.3V power supply via capacitor C11. One end of resistor R11 is connected to the RS485 transceiver's B pin, and the other end is connected to the RS485 transceiver's A pin.

[0046] In a preferred embodiment of this utility model, the power module includes a DC-DC power chip and its peripheral circuits, the peripheral circuits including a fuse, a reverse polarity protection diode, and a filter circuit.

[0047] In this embodiment, the fuse serves as overcurrent protection in the circuit, effectively cutting off faulty circuits in a short time. The reverse polarity protection diode is mainly used to prevent damage to the equipment caused by reversed power supply polarity. The input terminal Vin of the power module is connected to the 5V power supply through the fuse F13 and the diode. Capacitors C39 and C37 are connected in parallel, with one end connected to the 5V power supply, the VIN pin and EN pin of the power chip, and the other end grounded. One end of the inductor L2 is connected to the SW pin of the power chip and one end of capacitor C34, with the other end connected to the 3.3V power supply. The other end of capacitor C34 is connected to the BST pin of the power chip. Capacitors C35 and C36 are connected in parallel, with one end connected to the 3.3V power supply and the other end grounded. One end of resistor R52 is connected to the 3.3V power supply, and the other end is connected to the FB pin of the power chip and one end of resistor R51, with the other end grounded.

[0048] This invention also proposes an automatic tracking camera system, including a camera and a pan-tilt unit (PTZ). The automatic tracking camera system is connected to an intelligent control communication board via an RS485 interface. The intelligent control communication board is connected to a PLC via a network interface and also to a host computer via a network interface. In this embodiment, the PLC is responsible for collecting the coordinate information of the object being measured and transmitting the data to the intelligent control communication board via the network interface. The intelligent control communication board, as the core processing unit, processes and analyzes the received coordinate data, calculates the pan-tilt rotation angle and camera zoom parameters, and then controls the automatic tracking camera system to perform precise tracking. The host computer is used for parameter configuration and program download functions.

[0049] The working principle of this utility model:

[0050] Part 1: Network Interface and PLC Communication

[0051] Interface selection: An industrial-grade RJ45 Ethernet interface is selected to ensure the stability and reliability of communication. This interface supports the common industrial communication protocol Modbus TCP.

[0052] Data transmission process: The intelligent control communication board periodically reads the coordinate information of the tracked object from the PLC, receives the data, and ensures the accuracy of the data.

[0053] Part Two: Support for Modifying Tracking Parameters via Host Computer

[0054] User interface design: Develop host computer software and web interface with a simple, intuitive layout that is easy to operate.

[0055] Communication Mechanism: The host computer and web-based operating terminal establish a connection with the intelligent control communication board via a network, using TCP / IP or UDP protocols for data transmission. After the operator modifies parameters on the interface, the system packages the new parameters into a data packet and sends it to the intelligent control communication board. Upon receiving the parameter data, the intelligent control communication board parses and verifies it.

[0056] Part Three: Downloading the upgrade function to the intelligent communication control board via the host computer

[0057] Program storage and management: A large-capacity Flash memory is set in the intelligent control communication control board to store the system control program and various functional module programs.

[0058] Download process: The operator selects the program file to be downloaded on the host computer or web interface, and after clicking the download button, the system sends the program file to the intelligent control communication control board via the network.

[0059] Part 4: Wide Voltage Input

[0060] Power Module Design: A wide-voltage input power module is selected, capable of adapting to DC input voltages of 5-30V. The power module employs advanced power conversion technology and voltage regulation circuitry to convert the input voltage into a stable DC voltage, providing a reliable power supply to all components of the system.

[0061] Power supply protection: Fuses and reverse polarity protection diodes are used as the main protection components. The fuse provides overcurrent protection, effectively cutting off faulty circuits in a short time. The reverse polarity protection diode is mainly used to prevent damage to equipment caused by reversed power supply polarity; it utilizes the unidirectional conductivity of the diode.

[0062] Electromagnetic compatibility design: To ensure the system can operate normally under a wide voltage input environment and meet electromagnetic compatibility requirements, filter circuits are set at the input and output terminals of the power supply to effectively suppress electromagnetic interference on the power lines and improve the system's anti-interference capability.

[0063] It should be noted that this application does not improve the control program, and the control program and electrical components involved are all prior art.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A smart communication control board, characterized in that: The system includes a main control module, a network communication module, an RS485 communication module, and a power supply module. The network communication module and the RS485 communication module are both communicatively connected to the main control module. The power supply module provides power to the main control module, the network communication module, and the RS485 communication module. The main control module includes a microcontroller and connected filtering circuits, clock circuits, reset circuits, BOOT circuits, and SWD interface circuits. The RS485 communication module includes six identical communication sub-modules, all of which are connected to the main control module.

2. The intelligent communication control board according to claim 1, characterized in that: The filtering circuit includes capacitors C10, C11, C12, C13, C14, C15, C16, C23, C24, C31, C32, and resistor R45. Capacitors C10, C11, C12, C13, C14, C15, and C16 are connected in parallel, with one end connected to a 3.3V power supply and the other end grounded. Capacitors C23 and C24 are connected in parallel, with one end connected to the VREF+ and VDDA pins of the microcontroller and the other end connected to the pull-up resistor R45. One end of capacitor C31 is connected to the VCAP_1 pin of the microcontroller and the other end grounded. One end of capacitor C32 is connected to the VCAP_2 pin of the microcontroller and the other end grounded.

3. The intelligent communication control board according to claim 1, characterized in that: The clock circuit includes a crystal oscillator X1, a capacitor C17, and a capacitor C18. One end of the capacitor C17 is connected to one end of the crystal oscillator X1, and the other end of the capacitor C17 is grounded. One end of the capacitor C18 is connected to the other end of the crystal oscillator X1, and the other end of the capacitor C18 is grounded. The two ends of the crystal oscillator X1 are respectively connected to the OSC_IN pin and the OSC_OUT pin of the microcontroller.

4. The intelligent communication control board according to claim 1, characterized in that: The reset circuit includes a resistor R28 and a capacitor C19. One end of the resistor R28 is connected to one end of the capacitor C19 and the NRST pin of the microcontroller. The other end of the resistor R28 is connected to a 3.3V power supply, and the other end of the capacitor C19 is grounded.

5. The intelligent communication control board according to claim 1, characterized in that: The BOOT circuit includes resistors R36 and R40. One end of resistor R36 is connected to the BOOT0 pin of the microcontroller, and the other end of resistor R36 is grounded. One end of resistor R40 is connected to the BOOT1 pin of the microcontroller, and the other end of resistor R40 is grounded.

6. The intelligent communication control board according to claim 1, characterized in that: The SWD interface circuit includes connector H1, resistor R46, and resistor R47. Pin 1 of connector H1 is grounded via a diode, pin 4 of connector H1 is grounded, pin 2 of connector H1 is connected to the SWDIO pin of the microcontroller and pull-up resistor R46, and pin 3 of connector H1 is connected to the SWDCLK pin of the microcontroller and pull-down resistor R47.

7. The intelligent communication control board according to claim 1, characterized in that: The network communication module includes an Ethernet PHY and its peripheral circuits. The peripheral circuits include a clock circuit, a filter circuit, pull-up resistors, pull-down resistors, and an RJ45 interface. The Ethernet PHY is connected to a microcontroller.

8. The intelligent communication control board according to claim 1, characterized in that: The RS485 communication module includes an RS485 transceiver and its peripheral circuits. The peripheral circuits include capacitors, resistors, Zener diodes, and fuses. The RS485 transceiver is connected to a microcontroller.

9. The intelligent communication control board according to claim 1, characterized in that: The power module includes a DC-DC power chip and its peripheral circuits, which include a fuse, a reverse polarity protection diode, and a filter circuit.

10. An automatic tracking camera system, characterized in that: The system includes a camera and a pan-tilt unit. The automatic tracking camera system is connected to the intelligent control communication control board via an RS485 interface. The intelligent control communication control board is connected to the PLC via a network interface and is also connected to the host computer via a network interface.

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