Multifunctional repeater and multi-split system

Abstract

The invention relates to the technical field of communication, and discloses a multifunctional repeater and a multi-split system, and the multifunctional repeater comprises a micro-control unit, a plurality of first communication circuits with different communication types, and second communication circuits corresponding to the communication types of the first communication circuits; the micro-control unit is connected with the sending equipment through any first communication circuit and is used for receiving communication data transmitted by the sending equipment; and the micro-control unit is connected with the receiving equipment through a second communication circuit corresponding to the communication type of any first communication circuit, and is used for forwarding the communication data to the receiving equipment. The micro-control unit is connected with the sending device through the first communication circuit of any communication type and connected with the receiving device through the second communication circuit corresponding to the first communication circuit, data forwarding of different communication types can be achieved through one repeater, the complexity of repeater type selection is reduced, and the communication efficiency is improved. And the maintenance difficulty of the system is reduced.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a multifunctional repeater and a multi-connection system. Background Art

[0002] Multi-split system air conditioners are now widely used in commercial places such as shopping malls, gymnasiums, office buildings, etc. Due to the large number of models and types of multi-split system air conditioners, their communication methods are diverse, and commonly used multi-split communications are RS485, CAN, HBUS bus, etc. Since different communication interfaces use different data transmission protocols, there are data transmission barriers when transmitting data between unit equipment and networks with different protocols.

[0003] Due to technical limitations, multi-connection serial communication can usually only be carried out over short distances and cannot meet the network communication needs of large campus units. For serial lines, the higher the communication rate, the shorter the transmission distance. When long-distance transmission is required, the baud rate needs to be reduced and a repeater needs to be added.

[0004] Common repeaters are designed for the same type of serial port network. Different types of communication networks require different types of network repeaters. However, when there are many types of networks, there are many types of repeaters to choose from and many network interfaces, which can easily lead to greater difficulty in system network management and maintenance, and poor versatility in equipment selection and upgrade. Summary of the invention

[0005] In view of this, the present invention provides a multifunctional repeater and a multi-connection system to solve the problem that the selection of commonly used relays is complicated when the communication network type is complex, resulting in difficulty in system maintenance.

[0006] In a first aspect, the present invention provides a multifunctional repeater, comprising a microcontroller unit, a plurality of first communication circuits of different communication types, and a second communication circuit corresponding to the communication type of each first communication circuit;

[0007] The micro control unit is connected to the sending device through any first communication circuit, and is used to receive communication data transmitted by the sending device;

[0008] The micro control unit is connected to the receiving device via a second communication circuit corresponding to the communication type of any first communication circuit, and is used to forward the communication data to the receiving device.

[0009] Beneficial effect: The micro control unit is connected to the sending device through a first communication circuit of any communication type, and is connected to the receiving device through a second communication circuit corresponding to the first communication circuit, so as to obtain the communication data transmitted by the sending device through multiple communication methods and forward it to the receiving device. Data forwarding of different communication types can be achieved through one repeater, thereby reducing the complexity of repeater selection for large multi-connection systems and reducing the difficulty of system maintenance.

[0010] In an optional implementation, the multifunctional repeater further includes a first switching module and a second switching module;

[0011] The first switching module is connected to the micro control unit, the first communication circuit and the sending device respectively, and is used to respond to the switching instruction of the micro control unit to switch the communication type of the first communication circuit connected between the micro control unit and the sending device;

[0012] The second switching module is connected to the micro control unit, the second communication circuit and the receiving device respectively, and is used to respond to the switching instruction of the micro control unit to switch the communication type of the second communication circuit connected between the micro control unit and the receiving device.

[0013] Beneficial effect: The first switching module and the second switching module share the control pin of the microcontroller unit, and adopt a synchronous switching method to realize the relay forwarding of the same type of communication data. The first switching module and the second switching module are used to respond to the switching instruction of the microcontroller unit to realize the switching of the communication type, so that the microcontroller unit can obtain and forward the communication data of the corresponding communication type.

[0014] In an optional implementation, the first switching module includes a first switch control circuit and a second switch control circuit, and the second switching module includes a third switch control circuit and a fourth switch control circuit;

[0015] The control ends of the first switch control circuit, the second switch control circuit, the third switch control circuit and the fourth switch control circuit are respectively connected to the micro control unit;

[0016] The switching end of the first switch control circuit is connected to one end of any first communication circuit, the other end of any first communication circuit is connected to the switching end of the second switch control circuit, and the communication end of the second switch control circuit is connected to the sending device;

[0017] The switching end of the third switch control circuit is connected to one end of any second communication circuit, the other end of any second communication circuit is connected to the switching end of the fourth switch control circuit, and the communication end of the fourth switch control circuit is connected to the receiving device.

[0018] Beneficial effect: The microcontroller unit switches the communication type of the first communication circuit between the microcontroller unit and the transmitting device by controlling the first switch control circuit and the second switch control circuit to switch the switch. At the same time, the third switch control circuit and the fourth switch control circuit adopt a synchronous switching method to switch the communication type of the second communication circuit between the microcontroller unit and the receiving device, and facilitate the relay forwarding of the same type of communication data.

[0019] In an optional embodiment, the multifunctional repeater further includes a first communication port and a second communication port;

[0020] One end of the first communication port is connected to an external transmitting device, and the other end of the first communication port is connected to a communication end of the second switch control circuit;

[0021] One end of the second communication port is connected to the communication end of the fourth switch control circuit, and the other end of the second communication port is connected to an external receiving device.

[0022] Beneficial effect: The first communication port and the second communication port are set to communicate with the sending device and the receiving device respectively, so as to facilitate the reception, storage and forwarding of communication data.

[0023] In an optional implementation, the micro control unit is further configured to obtain communication data stored in the first communication port, and send the communication data to the second communication port.

[0024] Beneficial effect: By acquiring the communication data stored in the first communication port and sending the communication data to the second communication port, the relay forwarding of the communication data is achieved.

[0025] In an optional implementation, the communication ends of the first switch control circuit and the third switch control circuit are respectively connected to the micro control unit through a bidirectional communication serial port.

[0026] Beneficial effect: The microcontroller unit communicates with the corresponding switch control circuit through a two-way communication serial port, which is convenient for receiving and sending communication data and realizing two-way transmission of data.

[0027] In an optional implementation, the micro control unit is further configured to obtain communication data transmitted by the receiving device and forward the communication data to the sending device.

[0028] Beneficial effect: Not only can the communication data transmitted by the sending device be obtained, but also the communication data transmitted by the receiving device can be obtained by using the two-way serial port communication, and forwarded to the sending device, thus realizing two-way relay forwarding of data.

[0029] In an optional implementation, the plurality of first communication circuits include at least two of a CAN communication circuit, an RS485 communication circuit, and an HBUS communication circuit.

[0030] Beneficial effect: By setting up multiple communication circuits of different communication types, such as CAN communication circuit, RS485 communication circuit and HBUS communication circuit, the repeater can be compatible with various types of serial port networks, realize transparent transmission and forwarding of different network data, and solve the problem of incompatibility of different types of network data in traditional methods.

[0031] In a second aspect, the present invention provides a multi-connection system, comprising: a multi-connection device and a multi-function repeater according to the first aspect or any corresponding embodiment thereof.

[0032] Beneficial effect: Use a multi-functional repeater to connect multiple online devices. A single repeater can receive communication data of different communication types corresponding to different devices and forward it to the corresponding device, realizing intermediate data forwarding, reducing the complexity of repeater selection and the difficulty of system maintenance.

[0033] In an optional embodiment, the multi-split device is an air conditioner.

[0034] The beneficial effects of the present invention are:

[0035] The micro control unit is connected to the sending device through a first communication circuit of any communication type, and is connected to the receiving device through a second communication circuit corresponding to the first communication circuit, so as to obtain the communication data transmitted by the sending device through multiple communication methods and forward it to the receiving device. Data forwarding of different communication types can be achieved through one repeater, thereby reducing the complexity of repeater selection for large multi-connection systems and reducing the difficulty of system maintenance.

[0036] The present invention can automatically adapt and convert RS485, CAN, and HBUS communication networks under a single communication port, meet the requirements of multi-type serial port compatible communications, realize the interconnection and intercommunication of different types of interface communications, and has the characteristics of simple interface circuit design, strong communication performance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 is a schematic structural diagram of a multifunctional repeater according to an embodiment of the present invention;

[0039] Figure 2 is a schematic structural diagram of another multifunctional repeater according to an embodiment of the present invention;

[0040] Figure 3 is a structural schematic diagram of another multifunctional repeater according to an embodiment of the present invention;

[0041] Figure 4 is a structural schematic diagram of yet another multifunctional repeater according to an embodiment of the present invention;

[0042] Figure 5 is a work flow chart of a micro control unit according to an embodiment of the present invention;

[0043] Figure 6 2 is a schematic diagram of the structure of a multi-connection system according to an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 100. Multifunctional repeater;

[0046] 101, micro control unit; 102, first communication circuit; 103, second communication circuit; 104, first switching module; 1041, first switch control circuit; 1042, second switch control circuit; 105, second switching module; 1051, third switch control circuit; 1052, fourth switch control circuit; 106, first communication port; 107, second communication port. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "inside", "upper", "outer", "lower", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixed connection, detachable connection, or integrated connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can also be the connection between two components, it can be wireless connection, or it can be wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Multi-split system air conditioners are widely used in commercial places such as shopping malls, gymnasiums, office buildings, etc. Due to the large number of models and types, the communication methods of multi-split system air conditioners are diverse. Commonly used multi-split communications are RS485, CAN, HBUS bus, etc. Since different communication interfaces use different data transmission protocols, there are data transmission barriers when transmitting data between unit equipment and networks with different protocols.

[0051] Due to technical limitations, multi-connection serial communication can usually only be carried out over short distances and cannot meet the network communication needs of large campus units. For serial lines, the higher the communication rate, the shorter the transmission distance. When long-distance transmission is required, the baud rate needs to be reduced and a repeater needs to be added.

[0052] Common repeaters are designed for the same type of serial port network. Different types of communication networks need to match different types of network repeaters. Therefore, when there are many types of networks, there are many types of repeater selections and network interfaces, which makes unit network management and maintenance more difficult, and the versatility of equipment selection and upgrade is poor.

[0053] Therefore, the embodiment of the present invention combines a multi-connected communication network to design an MCU software integrated multi-functional repeater, which can have the ability to automatically adapt and convert RS485, CAN, and HBUS communication networks under a single communication interface, meet the requirements of multi-type serial port compatible communications, and realize the interconnection and interoperability of different types of interface communications. It has the characteristics of simple interface circuit design and strong communication.

[0054] According to an embodiment of the present invention, on the one hand, the present invention provides a multifunctional repeater 100, such as Figure 1 As shown, the multifunctional repeater 100 includes a microcontroller unit (MCU) 101 , a plurality of first communication circuits 102 of different communication types, and a second communication circuit 103 corresponding to the communication type of each first communication circuit 102 .

[0055] Specifically, the micro control unit 101 is connected to the sending device through any first communication circuit 102 to receive the communication data transmitted by the sending device, and the micro control unit 101 is connected to the receiving device through a second communication circuit 103 corresponding to the communication type of any first communication circuit 102 to forward the communication data to the receiving device. It should be noted that Figure 1 The solid line in the figure represents the first / second communication circuit to which the micro control unit 101, the sending device and the receiving device are currently connected, and the dotted line represents that they are currently not connected.

[0056] In this embodiment, the microcontroller unit 101 is connected to the sending device through a first communication circuit 102 of any communication type, and is connected to the receiving device through a second communication circuit 103 corresponding to the first communication circuit 102, so as to obtain the communication data transmitted by the sending device through multiple communication methods and forward it to the receiving device. Data forwarding of different communication types can be achieved through one repeater, thereby reducing the complexity of repeater selection for large multi-connection systems and reducing the difficulty of system maintenance.

[0057] It should be noted that the embodiments of the present application do not limit the specific structure of the microcontroller unit 101, the first communication circuit 102 and the second communication circuit 103, because the main invention of the present application lies in the overall layout of the microcontroller unit 101, the first communication circuit 102 and the second communication circuit 103, so as to achieve the effect of multiple data communication types of the multi-function repeater 100 and reduce the complexity of repeater selection for large multi-connection systems. As for the specific structure of the microcontroller unit 101, the first communication circuit 102 and the second communication circuit 103, they can be set according to actual usage. For example, the microcontroller unit 101 can also be a control chip such as a single-chip microcomputer, and the first communication circuit 102 and the corresponding second communication circuit 103 can be set as hardware circuits or chips related to communication. These adjustments all fall within the protection scope of the embodiments of the present application.

[0058] In some optional implementations, the plurality of first communication circuits 102 include at least two of a CAN communication circuit, an RS485 communication circuit, and an HBUS communication circuit, and the communication type and quantity of the second communication circuits 103 correspond to those of the first communication circuits.

[0059] In an embodiment of the present application, multiple communication circuits of different communication types are set, such as a CAN communication circuit, an RS485 communication circuit, and an HBUS communication circuit, so that the repeater can be compatible with multiple types of serial port networks, realize transparent transmission and forwarding of different network data, and solve the problem of incompatibility of different types of network data in traditional methods.

[0060] In some optional embodiments, such as Figure 2As shown, the multifunctional repeater 100 further includes a first switching module 104 and a second switching module 105. The first switching module 104 is respectively connected to the microcontroller unit 101, the first communication circuit 102 and the transmitting device, and is used to respond to the switching instruction of the microcontroller unit 101 to switch the communication type of the first communication circuit 102 connected between the microcontroller unit 101 and the transmitting device. In addition, the second switching module 105 is respectively connected to the microcontroller unit 101, the second communication circuit 103 and the receiving device, and is used to respond to the switching instruction of the microcontroller unit 101 to switch the communication type of the second communication circuit 103 connected between the microcontroller unit 101 and the receiving device.

[0061] Specifically, see again Figure 2 The first switching module 104 and the second switching module 105 share the control pin of the micro control unit 101 and adopt a synchronous switching method to realize the relay forwarding of the same type of communication data.

[0062] In the embodiment of the present application, the first switching module 104 and the second switching module 105 are used to respond to the switching instruction of the micro control unit to realize the switching of the communication type, so that the micro control unit 101 can obtain and forward the communication data of the corresponding communication type, thereby realizing the relay forwarding of the same type of communication data.

[0063] Furthermore, if Figure 3 As shown, the first switching module 104 includes a first switch control circuit 1041 and a second switch control circuit 1042, and the second switching module 105 includes a third switch control circuit 1051 and a fourth switch control circuit 1052. The control ends of the first switch control circuit 1041, the second switch control circuit 1042, the third switch control circuit 1051 and the fourth switch control circuit 1052 are connected to the micro control unit 101 respectively.

[0064] Furthermore, the switching end of the first switch control circuit 1041 is connected to one end of any first communication circuit 102, the other end of any first communication circuit 102 is connected to the switching end of the second switch control circuit 1042, and the communication end of the second switch control circuit 1042 is connected to the sending device.

[0065] In addition, the switching end of the third switch control circuit 1051 is connected to one end of any second communication circuit 103, the other end of any second communication circuit 103 is connected to the switching end of the fourth switch control circuit 1052, and the communication end of the fourth switch control circuit 1052 is connected to the receiving device.

[0066] In the embodiment of the present application, the micro control unit 101 switches the first switch control circuit 1041 and the second switch control circuit 1042 to switch the switch, thereby switching the communication type of the first communication circuit 102 between the micro control unit 101 and the transmitting device. At the same time, the third switch control circuit 1051 and the fourth switch control circuit 1052 use a synchronous switching method to switch the communication type of the second communication circuit 103 between the micro control unit 101 and the receiving device, thereby facilitating the relay forwarding of the same type of communication data.

[0067] It should be noted that the embodiments of the present application do not limit the specific structure of the switch control circuit because the main innovation of the present application lies in the overall layout of the switch control circuit, so as to achieve the effect of switching the communication type of the communication circuit. As for the specific structure of the switch control circuit, it can be set according to actual usage. For example, it can also be a switch tube, chip and other control devices. As long as the switching effect can be achieved, these adjustments are within the protection scope of the embodiments of the present application.

[0068] In some optional embodiments, such as Figure 4 As shown, the multifunctional repeater 100 further includes a first communication port 106 and a second communication port 107. One end of the first communication port 106 is connected to an external transmitting device, and the other end of the first communication port 106 is connected to a communication end of the second switch control circuit 1042; one end of the second communication port 107 is connected to a communication end of the fourth switch control circuit 1052, and the other end of the second communication port 107 is connected to an external receiving device.

[0069] Exemplarily, the microcontroller unit controls the first switch control circuit and the second switch control circuit to switch, forming a link between the first communication port 106 and the microcontroller unit 101; similarly, the microcontroller unit controls the third switch control circuit and the fourth switch control circuit to switch, forming a link between the second communication port 107 and the microcontroller unit 101, thereby realizing link switching of RS485, HBUS, and CAN communication circuits, and realizing data sending and receiving in three communication modes.

[0070] Specifically, the micro control unit 101 is further used to obtain the communication data stored in the first communication port 106 and send the communication data to the second communication port 107, thereby realizing the relay forwarding of the communication data.

[0071] In this embodiment, a first communication port 106 and a second communication port 107 are provided to communicate with a sending device and a receiving device respectively, so as to receive, store and forward communication data.

[0072] In some optional embodiments, see again Figure 4The communication ends of the first switch control circuit 1041 and the third switch control circuit 1051 are respectively connected to the micro control unit 101 through a bidirectional communication serial port.

[0073] Specifically, the micro control unit 101 has UART, CAN communication and other functions, and the selected I / O pins can be configured by software to use serial communication modes such as CAN or UART.

[0074] For example, see again Figure 4 , the microcontroller unit 101 (MCU) uses 4 pins, and sets two independent communication serial ports through software configuration, namely communication serial port 1 and communication serial port 2. The two independent serial ports can realize free switching of RS485, HBUS, and CAN communications. Communication serial port 1 and communication serial port 2 can realize two-way data relay transparent forwarding. After any communication serial port receives the communication data, it will be synchronously forwarded to the other serial port to realize two-way data transmission.

[0075] In the embodiment of the present application, the micro control unit communicates with the corresponding switch control circuit through a two-way communication serial port, which is convenient for receiving and sending communication data and realizing two-way transmission of data.

[0076] Specifically, the micro control unit 101 is also used to obtain communication data transmitted by the receiving device and forward the communication data to the sending device.

[0077] The embodiments of the present application can not only obtain the communication data transmitted by the sending device, but also use the two-way serial port communication to obtain the communication data transmitted by the receiving device, and forward it to the sending device, thereby realizing two-way relay forwarding of data.

[0078] like Figure 5 As shown, an embodiment of the present invention provides a work flow chart of a micro control unit, and its specific control timing is as follows:

[0079] First, power on the multi-function repeater and refer to Figure 4 The microcontroller unit is configured with two independent communication ports, namely, the communication types of the first communication port 106 and the second communication port 107 are CAN1 and CAN2 respectively, and the first, second, third and fourth switch control circuits are synchronously switched to CAN1 and CAN2 serial communication circuits. At this time, two-way real-time data transparent forwarding between the first communication port 106 of CAN type and the second communication port 107 of CAN type can be realized.

[0080] Afterwards, when it is detected that the first communication port 106 and the second communication port 107 have not received normal CAN communication data for a long time, the micro control unit switches the communication type, and the two communication ports are configured as UART1 and UART2. At the same time, the first, second, third and fourth switch control circuits are synchronously switched to RS485_1 and RS485_2 serial port communication circuits, so as to realize two-way real-time data transparent forwarding between the first communication port 106 of RS485 type and the second communication port 107 of RS485 type.

[0081] Then, when it is detected that the first communication port 106 and the second communication port 107 have not received normal RS485 communication data for a long time, the micro control unit will synchronously switch the first, second, third and fourth switch control circuits to HUBS1 and HUBS2 serial port communication circuits, thereby realizing bidirectional real-time data transparent forwarding between the HUBS type first communication port 106 and the HUBS type second communication port 107.

[0082] Finally, by looping in the above manner, the three types of serial port communications can be freely matched and switched on the same communication port to complete data transparent transmission and forwarding.

[0083] The repeater of the present invention adopts software programming design based on the micro control unit, realizes multiple types of network communications such as RS485, CAN, and HBUS through software configuration, combined with peripheral circuits and a single communication interface, and data forwarding adopts transparent transmission. At the same time, the communication port can identify the communication type of the network, adopts polling self-scanning mode and switch control circuit, switches and matches the corresponding type of serial port circuit, and realizes multiple types of network data transmission with a single communication interface.

[0084] The present invention adopts a single MCU software integrated design to achieve compatible transparent transmission and forwarding of multi-type network data, and the interface circuit design is simple. At the same time, a single communication port is used, which can automatically adapt to different types of serial port networks, and the installation and connection are simple and efficient, with strong versatility and scalability.

[0085] According to an embodiment of the present invention, a multi-connection system is provided, such as Figure 6 As shown, the multi-connection system 600 includes a multi-connection device 601 and a multi-function repeater 100. It should be noted that the number of the multi-connection device 601 can be multiple. Figure 6 Just as an example.

[0086] Specifically, the multi-functional repeater 100 can be connected between multiple multi-connected devices 601, and the multi-connected devices 601 can have multiple communication types. The multi-functional repeater 100 can identify the network type of the multi-connected device 601 connected to it through the communication port, and switch the communication circuit matching the network type to receive the communication data of the multi-connected device 601.

[0087] In some optional embodiments, the communication port of the multifunctional repeater 100 can automatically receive and store different types of communication data, and then the multifunctional repeater 100 switches different types of communication circuits in sequence in a timed manner to obtain the communication data stored in the communication port and forward it to the corresponding device.

[0088] Exemplarily, the multi-connected device 601 may be an air conditioner, but the embodiment of the present invention is not limited thereto.

[0089] In an embodiment of the present application, a multifunctional repeater is used to connect multiple connected devices. A single repeater can receive communication data of different communication types corresponding to different devices and forward them to the corresponding devices, thereby realizing intermediate data forwarding and reducing the complexity of repeater selection and the difficulty of system maintenance.

[0090] The present invention can automatically adapt and convert RS485, CAN, and HBUS communication networks under a single communication port, meet the requirements of multi-type serial port compatible communications, realize the interconnection and intercommunication of different types of interface communications, and has the characteristics of simple interface circuit design, strong communication performance, etc.

[0091] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A multifunctional repeater, characterized in that: The device comprises a micro control unit, a plurality of first communication circuits of different communication types, and a second communication circuit corresponding to the communication type of each first communication circuit; The micro control unit is connected to the sending device through any first communication circuit, and is used to receive the communication data transmitted by the sending device; The micro control unit is connected to a receiving device via a second communication circuit corresponding to a communication type of any one of the first communication circuits, and is used to forward the communication data to the receiving device.

2. The multifunctional repeater according to claim 1, characterized in that: The multifunctional repeater also includes a first switching module and a second switching module; The first switching module is connected to the micro control unit, the first communication circuit and the sending device respectively, and is used to respond to the switching instruction of the micro control unit to switch the communication type of the first communication circuit connected between the micro control unit and the sending device; The second switching module is connected to the micro control unit, the second communication circuit and the receiving device respectively, and is used to respond to the switching instruction of the micro control unit to switch the communication type of the second communication circuit connected between the micro control unit and the receiving device.

3. The multifunctional repeater according to claim 2, characterized in that: The first switching module includes a first switch control circuit and a second switch control circuit, and the second switching module includes a third switch control circuit and a fourth switch control circuit; The control ends of the first switch control circuit, the second switch control circuit, the third switch control circuit and the fourth switch control circuit are respectively connected to the micro control unit; The switching end of the first switch control circuit is connected to one end of any first communication circuit, the other end of any first communication circuit is connected to the switching end of the second switch control circuit, and the communication end of the second switch control circuit is connected to the sending device; The switching end of the third switch control circuit is connected to one end of any second communication circuit, the other end of any second communication circuit is connected to the switching end of the fourth switch control circuit, and the communication end of the fourth switch control circuit is connected to the receiving device.

4. The multifunctional repeater according to claim 3, characterized in that: The multifunctional repeater also includes a first communication port and a second communication port; One end of the first communication port is connected to an external transmitting device, and the other end of the first communication port is connected to a communication end of the second switch control circuit; One end of the second communication port is connected to the communication end of the fourth switch control circuit, and the other end of the second communication port is connected to an external receiving device.

5. The multifunctional repeater according to claim 4, characterized in that: The micro control unit is further used to obtain the communication data stored in the first communication port and send the communication data to the second communication port.

6. The multifunctional repeater according to any one of claims 3 to 5, characterized in that: The communication ends of the first switch control circuit and the third switch control circuit are respectively connected to the micro control unit through a bidirectional communication serial port.

7. The multifunctional repeater according to claim 6, characterized in that: The micro control unit is also used to obtain the communication data transmitted by the receiving device and forward the communication data to the sending device.

8. The multifunctional repeater according to any one of claims 1 to 5, characterized in that: The plurality of first communication circuits include at least two of a CAN communication circuit, an RS485 communication circuit, and an HBUS communication circuit.

9. A multi-link system, characterized in that: include: A multi-connection device and a multi-function repeater as claimed in any one of claims 1 to 8.

10. The multi-connection system according to claim 9, characterized in that: The multi-connected device is an air conditioner.

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