CN202750089U - Bluetooth device and integrated peripheral devices - Google Patents

Abstract

The utility model provides a Bluetooth device and an integrated peripheral device. The Bluetooth device comprises a signal receiving/transmitting unit for receiving instruction data which is transmitted by a terminal and which contains port information of a target data transmission port; a microcontroller for transmitting the instruction data to the corresponding data transmission port according to the port information; and a plurality of data transmission ports for transmitting the instruction data to integrated peripheral devices which are connected with the data transmission ports respectively; wherein the microcontroller is connected with the signal receiving/transmitting unit and the data transmission ports. The utility model can help to increase the communication efficiency.

Description

Bluetooth devices and integrated peripherals

technical field

The utility model relates to communication equipment, in particular to a bluetooth device and an integrated peripheral.

Background technique

Due to business and environmental requirements, the terminal often needs to use peripherals with different functions. The peripherals refer to, for example, a printer, a point of sale (point of sale, POS for short) card reader, an ID card reader, and the like. For example, when a business person goes to the customer's location, it is possible that the business person needs to verify the customer's identity, use an ID card reader, print certain types of documents, use a printer, etc., so the business person will carry the terminal, and the above-mentioned Multiple peripherals for ease of use. There are many communication methods between peripherals and terminals. Considering the convenience of use, more and more Bluetooth communication methods are used between terminals and peripherals.

Specifically, in order to realize the Bluetooth communication between the two, both the terminal and the peripheral are configured with a Bluetooth module used as a Bluetooth communication interface. The Bluetooth configured on the terminal can be called the host Bluetooth module, and the Bluetooth configured on the peripheral It is called a peripheral Bluetooth module; each peripheral has its own peripheral Bluetooth module. Assuming that the terminal needs to use multiple peripherals when performing a certain business, the Bluetooth module of the host will be connected to the peripheral Bluetooth modules of each peripheral one by one. For example, the terminal establishes a Bluetooth connection with peripheral A for communication. B, you need to disconnect the connection with the peripheral A, and then reconnect with the peripheral Bluetooth module of the peripheral B. The pairing process between the Bluetooth modules takes a lot of time. Therefore, the above method also makes the terminal When multiple peripherals communicate, the efficiency is very low, and if multiple host Bluetooth modules are installed on the terminal, the cost of the terminal will increase significantly.

Utility model content

The utility model provides a bluetooth device and an integrated peripheral to improve the communication efficiency when a terminal communicates with multiple peripherals.

The utility model provides a bluetooth device, comprising: a signal transceiving unit for receiving instruction data sent by a terminal, and the instruction data includes port information of a destination data transmission port; sending to the microcontroller corresponding to the data transmission port, and a plurality of data transmission ports for transmitting the instruction data to the connected peripherals;

The microcontroller is respectively connected with the signal transceiving unit and the data transmission port.

The bluetooth device as described above further includes: a memory for storing port configuration information, and the port configuration information includes the corresponding relationship information between the data transmission port and the connected peripheral device and the port information; correspondingly, the The microcontroller also includes: a peripheral information acquisition unit for acquiring the port configuration information from the memory, the peripheral information acquisition unit is connected to the memory; The acquired port configuration information is sent to the peripheral information reporting unit of the terminal through the signal transceiving unit, and the peripheral information reporting unit is respectively connected to the peripheral information obtaining unit and the signal transceiving unit.

In the above-mentioned bluetooth device, the microcontroller further includes: used for establishing a communication connection between the corresponding data transmission port and the peripheral device according to the port information and transmitting instruction data to the peripheral device through the data transmission port a transmission control unit; the transmission control unit is respectively connected to the signal transceiving unit and the plurality of data transmission ports.

The above bluetooth device further includes: a detection unit for detecting whether the peripheral device is in an idle state after the communication connection is established, and the detection unit is connected to the transmission control unit.

The Bluetooth device as described above further includes: a connection control unit configured to close communication connections between other data transmission ports other than the data transmission port corresponding to the port information and corresponding peripherals before establishing the communication connection, The connection control unit is connected to the transmission control unit.

In the Bluetooth device described above, the peripheral control unit is specifically a chip select switch that controls the communication connection by sending a chip select signal.

In the Bluetooth device as described above, the microprocessor further includes: a peripheral information correction unit for modifying the port configuration information in the memory when the peripheral connected to the data transmission port changes, and the peripheral information correction A unit is connected to the memory.

As for the Bluetooth device mentioned above, the data transmission port includes a Universal Serial Bus (USB) interface, or a Universal Asynchronous Receive/Transmit (UART) interface, or a Serial Peripheral Interface (SPI).

The utility model also provides an integrated peripheral device, including: the Bluetooth device described in the utility model, and a peripheral device; the peripheral device is connected to multiple data transmission ports of the Bluetooth device.

As for the above-mentioned integrated peripheral, there are multiple peripherals, each of which is connected to one of the data transmission ports; or, the number of peripherals is one, and the peripherals include A plurality of external ports, each of which corresponds to a function of the peripheral, and each of the external ports is connected to one of the data transmission ports.

The technical effect of the bluetooth device and the integrated peripherals of the present invention is: by using the bluetooth device as a unified communication interface, it is responsible for sending data to the destination data transmission port according to the port information in the command data and then to the connected Peripherals, so that the host Bluetooth module on the terminal side only needs to establish a Bluetooth connection with the unified Bluetooth device of the multiple peripherals, and can communicate with multiple peripherals through this Bluetooth, that is, only connect once. Establishing multiple bluetooth connections separately in the prior art inevitably improves communication efficiency.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the integrated peripheral device of the present invention;

Fig. 2 is the bluetooth data transmission schematic diagram of the integrated peripheral of the utility model;

Fig. 3 is a schematic diagram of the workflow of the utility model integrated peripheral embodiment;

FIG. 4 is a schematic structural diagram of another embodiment of the integrated peripheral device of the present invention.

Detailed ways

Fig. 1 is a schematic structural view of an embodiment of the utility model integrated peripheral, as shown in Fig. 1, the integrated peripheral is an integral device, which includes a peripheral bluetooth module 11 and a plurality of peripherals 12 ( In Fig. 1, the printer, the POS card reader, and the ID card reader are all peripherals, which represent peripherals 12), and the plurality of peripherals 12 can include but not limited to printers, POS card readers, ID card readers, etc. , Of course, other types of peripherals can be selected according to actual needs. Wherein, the peripheral bluetooth module 11 is the bluetooth device in the embodiment of the present invention, which is only referred to as the peripheral bluetooth module in FIG. 1 .

Wherein, the peripheral Bluetooth module 11 includes a signal transceiving unit 13, which is used to communicate with the terminal, for example, the peripheral Bluetooth module 11 can receive the instruction data sent by the terminal through the signal transceiving unit 13, The instruction data is the data to be sent by the terminal to the peripheral device; or the data fed back by the peripheral device to the terminal is sent to the terminal through the signal transceiving unit 13 . In a specific embodiment, the signal transceiving unit 13 can be realized by using a commonly used circuit structure, and is usually composed of circuits such as radio frequency transmission, radio frequency reception, frequency-shift keying (Frequency-shift keying, referred to as: FSK) modulation/demodulation, etc. It can receive and send digital signals and meet the requirements of Bluetooth radio frequency specifications.

The peripheral bluetooth module 11 also includes a plurality of data transmission ports 14, which are some I/O interfaces for transmitting data between the peripheral bluetooth module 11 and peripherals, for example, may include but not limited to universal serial Bus (Universal Serial BUS, referred to as: USB), Universal Asynchronous Receiver/Transmitter (Universal Asynchronous Receiver/Transmitter, referred to as: UART), Serial Peripheral Interface (Serial Peripheral Interface, referred to as: SPI) and other interfaces. It should be noted that a plurality of data transmission ports 14 are shown as a whole in FIG. 1 , and those skilled in the art can understand that they actually include a plurality of interfaces, for example, a USB interface correspondingly connected to a USB transmission channel, and a UART transmission port. The channel corresponds to the connected UART interface, etc.

A plurality of peripherals in the integrated peripherals are all connected to the aforementioned peripheral bluetooth module 11, referring to Fig. 1, the plurality of peripherals 12 are respectively connected to the aforementioned plurality of data transmission ports 14, for example, The printer is connected to the USB interface, the POS card reader is connected to the UART interface, the ID card reader is connected to the SPI interface, etc. The specific interface type needs to match the communication interface requirements of the peripherals. Generally, the multiple peripherals refer to peripherals with different functions, which can meet different usage requirements of the terminal.

The peripheral bluetooth module 11 also includes a microcontroller (Micro Control Unit, referred to as: MCU) 16, and the microcontroller 16 is connected with the signal transceiver unit 13 and the data transmission port 14 respectively. Wherein, the command data received by the signal transceiving unit 13 includes the port information of the destination data transmission port of the data transmission, for example, if the command data is sent to the USB interface, then the USB is the destination data transmission port of the data, and the port information is The information for identifying the USB interface is, for example, 001 (assuming that 001 represents the USB interface, 101 represents the UART interface, etc., and the specific identification setting depends on the configuration of the peripheral Bluetooth module itself). The microcontroller 16 can send the command data to the corresponding data transmission port according to the port information, and transmit the command data to the connected peripherals through the data transmission port.

In this embodiment, multiple peripherals are connected to a peripheral Bluetooth module, and the peripheral Bluetooth module is used as a unified communication interface, responsible for transmitting data between the terminal and multiple peripherals; the host Bluetooth module on the terminal side only It is necessary to establish a Bluetooth connection with the unified peripheral bluetooth module of the multiple peripherals, and then it is possible to communicate with multiple peripherals through the single peripheral bluetooth module, that is, only connect once. Establishing multiple Bluetooth connections will inevitably improve communication efficiency.

In addition, the peripheral Bluetooth module 11 also includes other basic functional units, such as a digital signal processing unit (Digital Signal Processing, referred to as: DSP), random access memory (random access memory, referred to as: RAM), etc., all of which are peripheral Bluetooth modules. Commonly used functional units of the module 11 are not shown in FIG. 1 . The peripheral bluetooth module 11 may be a bluetooth chip.

In this embodiment, the communication between the host Bluetooth module configured on the terminal side and the peripheral Bluetooth module 11 on the peripheral side is shown in FIG. 2 . FIG. 2 is a schematic diagram of Bluetooth data transmission of the integrated peripheral of the present invention. The host bluetooth module 21 and the peripheral bluetooth module 11 communicate using a transport layer communication protocol, specifically using the host control interface (Host CONTROL Interface referred to as HCI) transport layer that has been defined by the bluetooth protocol. The command information of the peripheral device is transmitted to the peripheral device, and the response information of the peripheral device side is transmitted to the terminal.

As shown in FIG. 1 , in this embodiment, the integrated peripheral may further include a memory 15 , and the memory 15 may be, for example, a FLASH memory. Specifically, the memory 15 is used to store port configuration information, and the port configuration information includes the corresponding relationship information between the data transmission port and the connected peripherals, and the port information of the data transmission port; for example as follows: Assuming a USB interface If the printer is connected, the UART interface is connected to the POS card reader, and the SPI interface is connected to the ID card reader, then the port configuration information stored in the memory 15 includes the corresponding relationship information between the data transmission port and the connected peripheral hardware, and the corresponding relationship information It is the above-mentioned "UART interface connected to the POS card reader, SPI interface connected to the ID card reader, etc.", the port information is "UART interface - 101, SPI interface - 100, etc.", that is, the information identifying the data transmission port. In addition, the memory 15 can also store other data, such as: the Chinese character library of the printer, etc.

Correspondingly, the microcontroller 16 may further include a peripheral information acquiring unit 161 and a peripheral information reporting unit 162 . Wherein, the peripheral device information acquisition unit 161 is connected to the memory 15, and by reading the port configuration information from the memory 15, the type of peripheral device connected to each port can be known. The peripheral information reporting unit 162 is connected to the peripheral information obtaining unit 161 and the signal transceiving unit 13, respectively, and is used to send the port configuration information obtained by the peripheral information obtaining unit 161 to the terminal through the signal transceiving unit, so that When sending data, the terminal carries the port information in the data according to the port configuration information. For example, if the terminal wants to send instruction data to the peripheral printer, it can be known by querying the corresponding relationship information in the port configuration information that the data connected to the printer The transmission port is a USB interface, and then the port information is checked to know that the port information of the USB interface is 001, then the 001 is carried in the sent data, for example, the port information can be set in the packet header of the command data packet.

In this embodiment, the microcontroller 16 also includes: a transmission control unit 163; the transmission control unit 163 is respectively connected to the signal transceiver unit 13 and the data transmission port 14, and is used to establish the port information according to the port information in the instruction data The communication connection between the corresponding data transmission port and the corresponding peripheral device, and the instruction data is transmitted to the peripheral device through the data transmission port after the communication connection is established. That is, the transmission control unit 163 can learn which port the instruction data is to be sent to based on the port information, and establish a communication connection between the port and the corresponding peripheral device accordingly, and establish a communication connection with the peripheral device. It refers to opening the data transmission port corresponding to the peripheral, and opening the transmission channel corresponding to the port, so that the connection between the data transmission port and the peripheral is in a state where data can be transmitted smoothly.

Optionally, the transmission control unit 163 can specifically be implemented by using a chip selection switch that controls the communication connection by sending a chip selection signal; it can send a chip selection signal to the data transmission port to control the communication connection, and the chip selection signal can be a high or low voltage For example, the transmission control unit 163 learns that the instruction data is to be sent to the USB interface according to the port information, and then the transmission control unit 163 sends a chip select signal to control the USB interface to be at an active level (usually low level active), At this time, the transmission channel between the USB interface and the connected peripheral device, that is, the printer, is opened, and the printer enters a circuit working state, and the transmission channel can realize data input and output.

In this embodiment, the integrated peripheral device may further include: a detection unit 165, which is connected to the transmission control unit 163, and can detect whether the peripheral device is in a busy or idle state after the communication connection is established. state, wait until the peripheral is idle, and then instruct the transmission control unit 163 to transmit the instruction data to the peripheral through the data transmission port corresponding to the peripheral.

In this embodiment, the integrated peripheral may also include: a connection control unit 166, which is connected to the transmission control unit 163 and the data transmission port respectively, and is used to establish the data transmission port corresponding to the port information and Before the communication connection between the corresponding peripheral devices, the communication connection between other data transmission ports other than the data transmission port corresponding to the port information and the corresponding peripheral devices is closed. For example, if the port information corresponds to the USB interface, then the connection control unit 166 needs to first close the communication connection between the UART interface and the SPI interface and the peripheral hardware, that is, the interface between it and the control unit is set to an inactive level (usually High level is invalid). Optionally, the integrated peripheral in this embodiment further includes: a peripheral information correction unit 164, connected to the memory 15, and used to modify the information stored in the memory when the peripheral connected to the data transmission port changes. port configuration information. For example, if the USB interface was originally connected to peripheral A, but now it is connected to peripheral B, then the correspondence information in the memory 15 needs to be changed, and the information can be changed through the peripheral information modification unit 164 . In FIG. 1 , the peripheral information correction unit 164 is set in the microcontroller 16 as an example. Of course, it can also be set outside the microcontroller 16 as long as it can communicate with the memory 15 for information modification.

Optionally, in a specific implementation, the peripheral information correction unit 164 and the peripheral information acquisition unit 161 can be the same device; and the revision of the peripheral information can be sent to the peripheral first by the host through the data interface between the Bluetooth modules The Bluetooth module writes into the memory 15 through the peripheral information correction unit 164 of the peripheral Bluetooth module; or the peripheral information correction unit 164 directly reads and writes the memory 15 through the debugging interface of the peripheral Bluetooth module.

In addition, the data transmission port in this embodiment may be a universal serial bus USB interface, or a universal asynchronous receiving/transmitting UART interface, or a serial peripheral interface SPI or the like. The peripheral device may be a printer, or a point-of-sale terminal POS card reader, or an ID card validator. The above-mentioned data transmission ports and peripherals are just examples, and other types of interfaces or peripherals may be used according to actual needs in actual implementation.

The working process of the integrated peripheral of this embodiment is described below in conjunction with FIG. 3. FIG. 3 is a schematic diagram of the workflow of the embodiment of the integrated peripheral of the present invention; the following is a brief description of the process, and details can be found in FIG. :

As shown in Figure 3, the terminal includes a host and a host Bluetooth module. The terminal and the integrated peripheral will first perform pairing of the Bluetooth modules, and then the respective Bluetooth modules (that is, the host Bluetooth module and the peripheral Bluetooth module) will perform initialization work with their respective connected devices. For example, the host Bluetooth module initializes the host, and the peripheral Bluetooth module initializes peripheral 1 and peripheral 2 respectively (here only peripheral 1 and peripheral 2 are taken as examples, of course, the peripheral Bluetooth module can also be connected to more than two Peripherals); said initialization means that all peripherals return to the initial state, and the chip select signal of the peripheral bluetooth module is an inactive level (the inactive level is usually a high level). If the peripheral has a self-test function, the peripheral bluetooth module instructs each peripheral to perform a serial self-test (that is, first sends a self-test command to peripheral 1, and after receiving the self-test result of peripheral 1, executes a serial self-test on peripheral 2 self-test), the self-test usually refers to whether the peripheral is in a normal working state, and the host Bluetooth module is notified of the result of the peripheral self-test, for example, if the peripheral is in an abnormal state such as a fault state, the result is reported The host Bluetooth module is informed.

Wherein, during the initialization process, the peripheral bluetooth module also reads port configuration information from the memory 15 to obtain the type of peripheral connected to each port. For example, the USB port is connected to a printer, and the UART interface is connected to an ID card reader, etc.; the peripheral Bluetooth module will send a service list to the host Bluetooth module on the terminal side, and the reported service list is an inherent process of the Bluetooth communication protocol. The service list refers to What is more important is what services can be provided on the side of the peripheral Bluetooth module, such as printer services and identity services.

When the host is about to operate peripheral 1, the host will encapsulate the operation to be performed on peripheral 1 according to the instruction format of peripheral 1 to form instruction data, and pass the instruction data together with the port information of the peripheral to be operated through the host Bluetooth module Transparently transmit to the peripheral Bluetooth module; for example, the port information can be set in the flag bit of the header of the data packet of the instruction data. The MCU in the peripheral bluetooth module judges the peripheral device to be operated by the host by judging the header flag bit of the data packet in the instruction data sent by the host. The chip select signal of the peripheral Bluetooth module to the peripheral 1 is at an active level, and obtains the status of the peripheral 1. If the peripheral 1 is in an idle state, the command data is transparently transmitted to the peripheral 1. Peripheral 1 directly feeds back the execution result to the host through the data transmission port of the Bluetooth module of the peripheral and the Bluetooth channel between the host and the peripheral.

When the host operates peripheral 2, the operation execution process is similar to that of peripheral 1, but it needs to set the chip select signal of peripheral 1 to an invalid level first, that is, disconnect the communication connection with peripheral 1, and then disconnect the external peripheral 1. The chip select signal of 2 is an active level. Moreover, the peripheral bluetooth module obtains the status of peripheral 2, if the peripheral 2 is in a busy state during execution, the data to be transmitted is cached, and the MCU of the peripheral bluetooth module enters a waiting state, and the waiting time can be Set it according to the actual situation, and try to send the command data again after the waiting time has elapsed. When the peripheral device 2 is in an idle state, the instruction data is transparently transmitted to the peripheral device 2 . The peripheral 2 directly feeds back the execution result to the host through the data transmission port of the Bluetooth module of the peripheral and the Bluetooth channel between the host and the peripheral.

It should be noted that Figure 1 of this embodiment is an example of connecting multiple peripherals to a peripheral Bluetooth module (ie, a Bluetooth device). , the peripherals include a printer, a POS card reader, and an ID card reader; when in use, these multiple peripherals are connected to the data transmission ports of the peripheral Bluetooth module in one-to-one correspondence, and then, through the host Bluetooth module on the terminal side and The peripheral bluetooth module communicates according to the method described in this embodiment, and after a bluetooth connection is established, different peripherals can be selected for use through the peripheral bluetooth module.

Another optional way is that an integrated function device can be used at the peripheral end, see FIG. 4 , which is a schematic structural diagram of another embodiment of the integrated peripheral device of the present invention. The integrated functional device has the functions of printer, POS card reader and ID card reader at the same time, that is, the integrated function device can use the printer function, POS card reader and ID card reader. The integrated function device has multiple external ports, for example, external port a, external port b and external port c, the printer function of the device can be used through the external port a, and the POS card reader function of the device can be used through the external port b, The ID card reader function of the device can be used through the external port c. Then each external port can be correspondingly connected to a data transmission port of the peripheral Bluetooth module 11 .

When using this kind of integrated function device, the multiple external ports of the device are respectively connected to the data transmission ports of the peripheral Bluetooth module in one-to-one correspondence, and then, through the host Bluetooth module on the terminal side and the peripheral Bluetooth module according to the implementation of this embodiment Communication is carried out in the above-mentioned way, and after a Bluetooth connection is established, different peripheral functions can be selected and used through the peripheral Bluetooth module. In this case, the transmission of command data to the connected peripherals described in this embodiment refers to the transmission of command data to the external port of the corresponding peripheral function, and the use of the corresponding peripheral function through the external port , can also be understood as a peripheral interface corresponding to a peripheral.

The advantage of this kind of integrated function device is that the volume of the integrated device can be smaller than the sum of multiple peripherals. For example, when there are multiple peripherals, each peripheral may be equipped with its own power supply, while the integrated A functional device is an integral device that only needs one power supply, and its volume is usually smaller than that of multiple peripherals. Therefore, an integrated functional device is more portable than multiple peripherals.

The integrated peripheral of this embodiment improves the portability of the peripheral and improves the communication efficiency by connecting multiple peripherals to one peripheral Bluetooth module and using the peripheral Bluetooth module as a unified communication interface. .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technology of the various embodiments of the present invention. scope of the program.

Claims (10)

1. A bluetooth device, comprising:

the system comprises a signal transceiving unit, a microcontroller and a plurality of data transmission ports, wherein the signal transceiving unit is used for receiving instruction data sent by a terminal, the instruction data comprise port information of a target data transmission port, the microcontroller is used for sending the instruction data to the corresponding data transmission port according to the port information, and the data transmission ports are used for transmitting the instruction data to connected peripherals;

the microcontroller is respectively connected with the signal transceiving unit and the data transmission port.

2. The bluetooth device according to claim 1, further comprising: a memory for storing port configuration information including correspondence information between a data transmission port and a connected peripheral and the port information;

correspondingly, the microcontroller further comprises:

the peripheral information acquisition unit is used for acquiring the port configuration information from the memory and is connected with the memory;

and the peripheral information reporting unit is used for sending the port configuration information acquired by the peripheral information acquisition unit to the terminal through the signal transceiving unit, and is respectively connected with the peripheral information acquisition unit and the signal transceiving unit.

3. The bluetooth device according to claim 2, wherein the microcontroller further comprises: the transmission control unit is used for establishing communication connection between the corresponding data transmission port and the peripheral equipment according to the port information and transmitting the instruction data to the peripheral equipment through the data transmission port; the transmission control unit is respectively connected with the signal transceiving unit and the plurality of data transmission ports.

4. The bluetooth device according to claim 3, further comprising:

a detection unit for detecting whether the peripheral is in an idle state after the communication connection is established, the detection unit being connected with the transmission control unit.

5. The bluetooth device according to claim 3, further comprising:

and the connection control unit is used for closing the communication connection between other data transmission ports except the data transmission port corresponding to the port information and the corresponding peripheral before the communication connection is established, and is connected with the transmission control unit.

6. The bluetooth device according to any of claims 3 to 5, wherein the transmission control unit is in particular a chip select switch for controlling the communication connection by sending a chip select signal.

7. The bluetooth device according to claim 2, wherein the microcontroller further comprises: and the peripheral information correction unit is used for modifying the port configuration information in the memory when the peripheral connected with the data transmission port is changed, and is connected with the memory.

8. The bluetooth device according to claim 1, wherein the data transmission port comprises a Universal Serial Bus (USB) interface, or a universal asynchronous receiver/transmitter (UART) interface, or a Serial Peripheral Interface (SPI).

9. An integrated peripheral, comprising: the bluetooth device of any one of claims 1-8, and a peripheral; the peripheral is connected with a plurality of data transmission ports of the Bluetooth device.

10. The integrated peripheral of claim 9, wherein the number of said peripherals is plural, each said peripheral being connected to one said data transfer port; or,

the number of the peripheral equipment is one, the peripheral equipment comprises a plurality of external ports, each external port corresponds to one function of the peripheral equipment, and each external port is connected with one data transmission port.

Images