JP5871607B2 - Data transfer device and data transfer method - Google Patents

Description

The present invention relates to a data transfer device and a data transfer method for transferring data output from an electronic device to the outside.

Some electronic devices such as sensor devices, office devices, and home appliances have a function of outputting measurement data, use history, driving state, or data representing the state history as digital data.
For example, when an electronic device has a communication function, the data is transmitted from the electronic device to another electronic device or computer via a network, and the transferred data is transmitted to the destination electronic device or computer. Is stored and used for various services.

  If the electronic device does not have a communication function, a storage device such as a USB (Universal Serial Bus) memory is connected to the electronic device, and data output from the electronic device is stored in the storage device. A storage device is removed and connected to another electronic device or computer to read out stored data (see, for example, Patent Document 1).

  In some cases, a computer is serially connected to the electronic device, and data is directly output from the electronic device to the computer.

JP 2008-9253 A

  However, in order to add a communication function to the electronic device itself, the development cost of both software and hardware is required, and there is a problem that the manufacturing price of the device becomes high. In addition, when carrying data using a storage device, the storage device must be attached to and detached from the electronic device that is the source of the data and another electronic device or computer that is the destination of the data. In addition, there is a problem that the data output from the electronic device cannot be monitored in real time. Further, when data output is performed directly by connecting another computer serially, the computer must be connected to the electronic device, which is problematic in terms of cost and space.

The present invention has been made paying attention to the above circumstances, and the object of the present invention is to be output from the electronic device without increasing the cost of the electronic device, making it complicated due to the attachment or detachment of the storage device, and increasing the installation space. It is an object to provide a data transfer device and a data transfer method that can transfer data to the outside.

In order to achieve the above object, an aspect of the present invention provides a device interface unit to which an electronic device is connected, a communication interface unit to which a communication module is connected, a memory and a processor unit, and the device interface unit and the communication. A main control unit to which the unit is connected, the main control unit receives data output from the electronic device via the device interface, and controls the communication module connected to the communication interface unit to A function of transmitting data and a function of monitoring the output frequency of data by the electronic device, and based on the output frequency monitoring result, in a time zone in which the data output frequency is higher than a preset threshold value The data output from the electronic device is received and temporarily stored, and the timing at which the data is finally received The stored data is transferred in a batch within a predetermined time from the beginning, and in a time zone in which the data output frequency is lower than the threshold value, the data output from the electronic device is not stored in real time. It is configured to forward .

Therefore, according to one aspect of the present invention, data output from an electronic device is automatically transferred by a data transfer device. For this reason, since it is not necessary to provide a communication function such as a modem or a network interface in the electronic device, it is possible to prevent the cost of the electronic device from increasing, and it is not necessary to use a storage device such as a USB memory for data transfer. Therefore, complicated operations such as the insertion / removal operation of the storage device and the writing / reading operation of data to / from the storage device become unnecessary. Furthermore, the data transfer device has limited functions and can be made as small as an adapter as compared to a personal computer or the like. For this reason, it is not necessary to secure a large installation space.
In other words, a data transfer device and a data transfer method are provided that can transfer data output from an electronic device to the outside without increasing the cost of the electronic device, making it complicated by attaching and detaching a storage device, and increasing the installation space. be able to.

Also, it is possible to transfer the output data from the electronic device in real time.

In addition, data output from the electronic device, are simultaneously transferred after being stored in the data transfer device by a predetermined time period minutes. Therefore, for example, when the transfer is performed via a communication network, an increase in the communication traffic can be avoided.

Furthermore, the high time period than the output frequency is the threshold data, the data can be suppressed increase in communication traffic on the network by not frequently forward, yet the timing of receiving the last data By transferring the data all at once within a certain time, it is possible to transfer the data without greatly delaying the transfer timing. Further, in a time zone in which the data output frequency is lower than the threshold value, it is possible to transfer in real time in response to a single data transmission from the electronic device. In other words, it is possible to realize data transfer that maintains communication traffic suppression and real-time data transfer in a well-balanced manner.

It is a block diagram which shows the 1st Example of the hardware constitutions of the data transfer device which concerns on one Embodiment. It is a block diagram which shows the 2nd Example of the hardware constitutions of the data transfer device which concerns on one Embodiment. It is a block diagram which shows the software structure of the data transfer device which concerns on one Embodiment. It is a figure which shows the external appearance of the time recorder which is an example of the apparatus to which the data transfer device which concerns on one Embodiment is connected. It is a block diagram which shows the hardware constitutions of the time recorder shown in FIG. It is a figure which shows the structure of the system which transfers the data output from a time recorder to a server by a data transfer device. 7 is a flowchart showing a first operation example of a time recorder and a data transfer device in the system shown in FIG. 6. 7 is a flowchart showing a second operation example of the data transfer device in the system shown in FIG. 6.

Embodiments of the present invention will be described below with reference to the drawings.
[One Embodiment]
(Constitution)
FIG. 1 is a block diagram showing a first example of the hardware configuration of the data transfer device according to the embodiment of the present invention.
The hardware of the data transfer device 100A mainly includes a USB (Universal Serial Bus) interface (USB I / F) 101, a USB controller 102, a microcontroller 103, and a USB interface (USB I / F) 108. Has been. The data transfer device 100A has a configuration in which the USB I / Fs 101 and 108 are exposed outside the casing, and other elements are accommodated in the casing.

  The USB I / F 101 is composed of, for example, a plug-type USB terminal. The USB I / F 101 is connected directly or via a USB cable to a socket-type USB terminal provided in an electronic device such as a time recorder having a function as a USB host. The USB controller 102 is composed of an independent semiconductor chip, and holds a USB descriptor to be recognized as a mass storage class device by the host in order to control communication using the USB I / F 101. .

  On the other hand, the USB I / F 108 is composed of, for example, a socket-type USB terminal. A modem 109 as a communication module is connected to the USB I / F 108 directly or via a USB cable. The modem 109 is an external type independent device, for example, a 3G modem having a USB interface. When a command output from the data transfer device 100A via the USB I / F 108 is received, communication is performed by connecting to the mobile communication network via the antenna 109 under the control of the built-in communication control unit. Has the function to perform.

  The microcontroller 103 includes a central processing unit (CPU) 104, a memory 105, a timer 106, and a USB controller 107. The memory 105 includes a ROM that stores a program, a RAM that is used when the program is executed, and a Flash ROM that is a non-volatile memory that is used for storing data and can be written and read as needed. . The CPU 104 communicates with devices connected to the USB I / Fs 101 and 108 by executing a program stored in the ROM of the memory 105, and realizes operations described later. The timer 106 enables time measurement by the microcontroller 103 and generates interrupt signals to the CPU 104 at regular time intervals. The USB controller 107 controls communication using a USB I / F 108 described later.

  In the configuration of FIG. 1 described above, the case where the modem 110 independent of the data transfer device 100A is externally attached using the USB I / F 108 has been described as an example. However, the present invention is not limited to this, and the function of the modem 110 may be built in the data transfer device 100B as illustrated in FIG.

  FIG. 3 is a block diagram showing a configuration of software installed in the microcontroller 103. As shown in FIG. 3, software implemented in the microcontroller 103 mainly includes an RTOS (Real-Time Operating System) 131, a main control program 132, a modem control program 133, an HTTP Client 134, and a TCP / IP protocol stack. 135, a USB protocol stack 136, and USB I / F access codes 140 and 141.

  The RTOS 101 provides basic functions as a computer to the microcontroller 103 and also provides a software execution environment in which the processing time can be predicted to be within a certain range. The main control program 132 is software for operating the data transfer device 100A as will be described later. Address information of a server or communication terminal connected via the modem 110, authentication information for logging in to the server, etc. Is held.

The modem control program 133 also has a function as a device driver for controlling the modem 110.

  The HTTP client 134 is a module for providing the main control program 132 with a function as an HTTP communication client. The TCP / IP protocol stack 135 is for executing various communication protocols such as PPP (Point-to-Point Protocol), IP (Internet Protocol), TCP (Transmission Control Protocol), UDP (User Datagram Protocol), Socket, and DNS. A collection of modules.

  The USB protocol stack 136 provides the main control program 132 with a function for communicating with an electronic device as a USB device and the modem 110. The USB Mass Storage Device Class 137, the USB Device Driver 139, the USB CDC Host Class 138, and the USB Host are provided. This is a collection of modules such as the driver 140.

The USB Device driver 139 realizes a common function as a USB device, and the USB Mass Storage Device 137 realizes a function as a USB mass storage device. The USB Host driver 140 realizes a common function as a USB host, and the USB CDC Host Class 138 provides a function as a host for a USB communication device.
The USB I / F access codes 141 and 142 are codes for accessing the registers that control the USB controllers 102 and 107, respectively.

  By mounting the software as described above, the microcontroller 103 controls each part of the data transfer device 100A to realize the operation described later. That is, the data transfer device 100A is recognized as a USB mass storage by an electronic device connected to the USB I / F 101, and receives and holds data output from the electronic device. Then, the modem 110 connected to the USB I / F 108 is controlled to transmit the stored data to a server or the like via a communication network.

  Therefore, there is no need for hardware and software for realizing communication in an electronic device, and an existing device can be used as it is. Even when a new device is developed, the hardware for communication is used. Or there is no need to develop additional software.

  FIG. 4 is a diagram showing an appearance of a time recorder 200, which is an example of an electronic apparatus to which the data transfer device 100A configured as described above is connected. The time recorder 200 includes a display unit 204, an operation unit 207, and a USB I / F 210 in a housing 221, and further includes a slit 222 for inserting a time card in the upper portion of the housing 221. A card recognition unit and a printing unit are provided at the back of the slit 222.

  FIG. 5 is a block diagram showing a functional configuration of the time recorder 200. As shown in FIG. 5, the time recorder 200 includes a main control unit 205, and a card recognition unit 201, a printing unit 202, a clock unit 203, a display unit 204, a storage unit 206, and an operation unit 207 are added to the main control unit 205. The buzzer 208 and the USB controller 209 are connected. A USB I / F 210 is connected to the USB controller 209.

  In the time recorder 200, for example, when the main control unit 205 controls each unit, the card recognition unit 201 recognizes the time card in response to the user inserting the time card into the slit 222, and the buzzer 208 sounds. Then, the printing unit 202 prints the stamp type (attendance time, leaving time, etc.) set by the operation unit 207 and the time acquired from the clock unit 203 on the time card. At the same time, the attendance data such as the user name, date, time, and stamp type associated with the recognized time card is temporarily stored or accumulated in the storage unit 206 and transferred to the data transfer device 100A connected to the USB I / F 210. The operation of outputting the temporarily stored or accumulated attendance data is performed. For this data output, the USB controller 209 uses a controller having a host function.

FIG. 6 shows the configuration of a system for transferring attendance and attendance data output from the time recorder 200 shown in FIG. 4 from the data transfer device 100A shown in FIGS. 1 and 3 to the server 236 via the communication network 250. FIG.
As shown in FIG. 6, this communication network 250 includes a mobile communication network 233 including base stations 231 and 232, and a wired communication network 235 connected to the mobile communication network 233 via a gateway 234. . Examples of the mobile communication network 233 include a 3G mobile communication network, a wireless local area network (LAN), a WiMax (Worldwide Interoperability for Microwave Access) (registered trademark), or a mobile communication network using LTE (Long Term Evolution). A wireless data communication network is used. A wired IP network such as the Internet is used as the wired communication network 235, and the server 236 operates as a Web server provided on the Internet.

  The data transfer device 100A including the modem 110 is connected to the mobile communication network 233 within the service area formed by the base stations 231 and 232, and is further connected to the server from the mobile communication network 233 via the gateway 234 and the wired communication network 235. 236. The attendance / leaving data output from the time recorder 200 can be transferred to the server 236 via the connected communication link.

  The communication terminal 230 possessed by the user is also connected to the mobile communication network 233 within the service area formed by the base stations 231 and 232, and the server 236 is further connected from the mobile communication network 233 via the gateway 234 and the wired communication network 235. Connected to. Then, it is possible to download and view the user's own attendance and attendance data stored in the data storage device 237 attached to the server 236 via the connected communication link.

(First operation example)
FIG. 7 is a flowchart showing a first operation of time recorder 200 and data transfer device 100A in the system shown in FIG. In the first operation, a case where the data transfer device 100 transfers the attendance data to the server 236 each time a time card is stamped in the time recorder 200 will be described.

  In the time recorder 200, when the user inserts a time card into the slit 222, the card recognition unit 201 detects this time card, and under the control of the main control unit 205, the printing unit 202 stamps the current time on the time card ( Step ST101). The main control unit 205 once stores the time and date of the time stamp, the time stamp type (going to work or leaving or others), and the user ID in the storage unit 206 (step ST102). The attendance data is converted into a predetermined output data format in step ST103, and then sent from the USB I / F 210 to the data transfer device 100A under the control of the USB controller 209 (step ST104).

  On the other hand, when the data transfer device 100A receives the attendance data sent from the time recorder 200 by the USB controller 102 via the USB I / F 101, the data attendance data is temporarily stored in the RAM in the memory 105 (step ST105). ).

  Next, under the control of the CPU 104, first, in step ST106, the modem 110 is operated via the USB controller 107, thereby connecting to the mobile communication network 233, and further from this mobile communication network 233 to the gateway 234 and the wired communication network 235. To the server 236 via Subsequently, in step ST107, the attendance / leaving data stored in the RAM is read, and this data is transmitted to the server 236 via the connected communication link. Then, in step ST108, it is determined whether or not the transmission is completed during the transmission operation. When the transmission is completed, the communication link established with the server 236 is released in step ST109, and the mobile communication network 233 is connected. Terminate the connection between. Finally, in step ST110, the transmitted attendance data stored in the RAM is deleted. If it is determined in step ST108 that the transmission has not been completed, the process returns to step ST107 and the transmission / reception data transmission operation is continued.

  When the server 236 receives the attendance data sent from the data transfer device 100A, the server 236 stores the data in the data storage device 237.

  Further, in this state, it is assumed that the user accesses the server 236 using the browser function in the communication terminal 230 and thereby transmits a request to view attendance data. Then, the server 236 selectively reads the attendance / attendance data corresponding to the user ID specified by the browse request from the data storage device 237 and transmits the read attendance / attendance data to the requesting communication terminal 230. In the communication terminal 230, the attendance data sent from the server 236 is displayed on the display unit. Therefore, for example, the user can check his / her past attendance data from anytime and anywhere.

  As described above, according to the first operation example, every time a time stamp operation is performed in the time recorder 200, the attendance data is transferred from the data transfer device 100A to the server 236 via the communication network 250, and the data storage device. 237. For this reason, since it is not necessary to provide the time recorder 200 with a communication function such as a modem or a network interface, it is possible to prevent the time recorder 200 from being increased in cost, and it is not necessary to use a storage device such as a USB memory for data transfer. Therefore, complicated operations such as the insertion / removal operation of the storage device and the writing / reading operation of data to / from the storage device become unnecessary. Furthermore, the functions of the data transfer device 100A and the modem 110 are limited, and in general, the data transfer device 100A and the modem 110 can be made as small as an adapter compared to a personal computer or the like. For this reason, a large installation space becomes unnecessary.

  Further, according to the first operation example, the attendance / attendance data is transferred every time the time recorder 200 is stamped, so that the attendance / attendance data can be collected and managed in real time by the server 236.

(Second operation example)
FIG. 8 is a flowchart showing a second operation of time recorder 200 and data transfer device 100A in the system shown in FIG. In this second operation, every time a time card is stamped in the time recorder 200, the attendance data is temporarily stored in the data transfer device 100, and after a predetermined amount of time has been stored, it is read out and collectively stored. The case of transferring to the server 236 will be described.

  In the time recorder 200, when a user inserts a time card into the slit 222, time stamping is performed on the time card, and attendance and attendance data including the time stamping date, time stamping type, and user ID are converted into a predetermined output data format. After that, it is the same as the first operation example in that it is transmitted from the USB I / F 210 under the control of the USB controller 209.

  Under the control of the CPU 104, the data transfer device 100A first initializes the count value of the timer 106 in step ST201, and then starts the count operation. The count time of the timer 106 is set to 1 hour, for example. Note that the count time of this timer is not limited to 1 hour, and may be set longer, for example, 24 hours, 12 hours, 6 hours, 3 hours, and shorter after the start time and end time. Other time zones may be set longer.

  When the attendance data is sent from the time recorder 200 during the counting operation of the timer 106, the data transfer device 100A receives the attendance data at the USB controller 102 via the USB I / F 101, and then performs steps according to the control of the CPU 104. In S202, the data is stored in the Flash ROM in the memory 105. Thereafter, every time the attendance data is sent from the time recorder 200, the attendance data is received and sequentially stored in the flash ROM in the memory 105.

  Now, assume that the timer 106 times out in this state. Then, the data transfer device 100A detects this timeout in step ST203, and determines in step ST204 whether or not the attendance data is stored in the flash ROM in the memory 105. As a result of this determination, if at least one attendance / attendance data is accumulated, first, in step ST205, the modem 110 is operated via the USB controller 107 under the control of the CPU 104, thereby connecting to the mobile communication network 233, The mobile communication network 233 is further connected to the server 236 via the gateway 234 and the wired communication network 235. Subsequently, in step ST206, all the attendance data stored in the flash ROM in the memory 105 is read, and the read attendance data is transmitted to the server 236 via the connected communication link.

  Then, in step ST207, it is determined whether or not the transmission is completed during the transmission operation. When the transmission is completed, the communication link established with the server 236 is released in step ST208, and the mobile communication network 233 is connected. Terminate the connection. Finally, in step ST209, the attendance data that has been transmitted and saved in the flash ROM in the memory 105 is discarded. If it is determined in step ST207 that the transmission has not been completed, the process returns to step ST206 to continue the work data transmission / reception operation.

Thereafter, similarly, with the count period of the timer 106 as one cycle, the process of accumulating the attendance data that is output from the time recorder 200 and the batch transfer process of the attendance data for the server 236 are repeatedly executed.
The server 236 receives the transferred attendance data, and stores it in the data storage device 237 every time the attendance data is transferred from the data transfer device 100A at once.

  Further, in this state, it is assumed that the user accesses the server 236 using the browser function in the communication terminal 230 and thereby transmits a request to view attendance data. Then, the server 236 selectively reads the attendance / attendance data corresponding to the user ID specified by the browse request from the data storage device 237 and transmits the read attendance / attendance data to the requesting communication terminal 230. In the communication terminal 230, the attendance data sent from the server 236 is displayed on the display unit. Therefore, for example, the user can check his / her past attendance data from anytime and anywhere.

As described above, according to the second operation example, the attendance / leaving data sent from the time recorder 200 is stored in the data transfer device 100A for a predetermined period and then transferred to the server 236 at a time. Therefore, the server 236 cannot perform real-time monitoring of attendance / leaving data, but an increase in traffic of the communication network 250 can be avoided.
Similarly to the first operation example, it is possible to prevent the time recorder 200 from being increased in cost, complicated operation due to insertion / removal of a storage device, writing / reading of data to / from the storage device, enlargement of the time recorder, and the like. is there.

[Other Embodiments]
The present invention is not limited to the above embodiment, and various modifications can be made as follows.
For example, in the embodiment, every time data sent from the electronic device (time recorder 200) is received, the data is transferred to the server 236, or the data sent from the electronic device (time recorder 200) is accumulated, and the timer 106 is stored. The accumulated data is transferred to the server 236 every time a predetermined time specified by the above item elapses. However, the present invention is not limited to this. For example, the output frequency of data by electronic devices is monitored, the output data is temporarily stored in a time zone when the data output frequency is higher than the threshold value, and within a certain time from the timing when the data is finally received The accumulated data is transferred in a batch. On the other hand, in a time zone in which the data output frequency is lower than the threshold value, the output data is transferred in real time without being accumulated.

In this way, in a time zone in which the data output frequency is higher than the threshold, it is possible to suppress an increase in traffic of the communication network by not transferring the data frequently and to be constant from the timing of the last data reception. By transferring the data all at once within the time, it becomes possible to transfer the data without greatly delaying the transfer timing. Further, in a time zone in which the data output frequency is lower than the threshold value, it is possible to transfer in real time in response to a single data transmission from the electronic device. In other words, it is possible to realize data transfer that maintains communication traffic suppression and real-time data transfer in a well-balanced manner.
In addition to the data output frequency, the data transfer timing may be controlled according to the type and importance of the output data.

  Furthermore, although the case where the data transfer device 100 is connected to the time recorder 200 has been described in the above embodiment, the present invention can be widely applied to any electronic device that outputs data to a USB memory or the like. In the above embodiment, the case where data transfer is performed by connecting data transfer devices 100A and 100B of a type recognized as a USB memory to an electronic device of the type that writes data to the USB memory, but this is not essential. By changing the interfaces of the data transfer devices 100A and 100B, it is possible to cope with various outputs of electronic devices.

  Further, a configuration may be adopted in which a wired or wireless LAN module is connected to the data transfer devices 100A and 100B, and the data transfer devices 100A and 100B are connected to the wired LAN or the wireless LAN. Similarly, it may be configured to connect to a WiMAX network or an LTE network using a WiMAX modem or an LTE modem.

  Furthermore, in the above-described embodiment, the case where the data output from the electronic device is transferred from the data transfer devices 100A and 100B to the server 236 via the communication network 250 has been described as an example, but pairing is set with the data transfer devices 100A and 100B. You may make it forward to the other terminal. In this way, the user simply connects the data transfer devices 100A and 100B to the electronic device, and performs data output from the electronic device without any special operation, for example, a mobile phone, a smart phone, a tablet terminal, It can be transferred to an audio player, game device, or car navigation device.

  Furthermore, in the embodiment, the USB controller 101 that controls communication via the USB I / F 101 connected to the device is configured as an independent semiconductor chip, and controls communication via the USB I / F 108 to which the modem is connected. Although the USB controller 107 is built in the microcontroller, the USB controller 101 may be built in the microcontroller and the USB controller 107 may be an independent semiconductor chip, or both are built in the microcontroller. A configuration may be possible, and a configuration in which both are independent semiconductor chips is also possible.

  In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in each embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  100A, 100B ... Data transfer device, 101, 108 ... USB interface (USB I / F), 102 ... USB controller, 103 ... Microcontroller, 104 ... CPU, 105 ... Memory, 106 ... Timer, 107 ... USB controller, 109 ... Antenna, 110 ... modem, 131 ... RTOS, 132 ... main control program, 133 ... modem control program, 134 ... HTTP Client, 135 ... TCP / IP protocol stack, 136 ... USB protocol stack, 137 ... USB Mass Storage Host Class, 138 ... USBCDC Host Class, 139 ... USB Device Driver, 140 ... USB Host Driver, 141,142 ... USB I / F Access Code DESCRIPTION OF SYMBOLS 200 ... Time recorder 201 ... Card recognition part 202 ... Printing part 203 ... Clock part 204 ... Display part 205 ... Main control part 206 ... Memory | storage part 207 ... Operation part 208 ... Buzzer 209 ... USB controller, 210 ... USB IF, 221 ... housing, 222 ... slit, 230 ... communication terminal, 231,232 ... base station, 233 ... mobile communication network, 234 ... gateway, 235 ... wired communication network, 236 ... server, 237 ... data storage apparatus.

Claims (2)

A device interface unit to which an electronic device is connected; a communication interface unit to which a communication module is connected; and a main control unit having a memory and a processor unit to which the device interface unit and the communication unit are connected;
The main control unit
A function of receiving data output from the electronic device via the device interface, controlling a communication module connected to the communication interface unit, and transmitting the data;
A function of monitoring the frequency of data output by the electronic device,
Based on the monitoring result of the output frequency, in a time zone in which the data output frequency is higher than a preset threshold, the data output from the electronic device is received and temporarily stored, and the data is finally received. The accumulated data is transferred in a batch within a predetermined time from the timing, and in a time zone where the data output frequency is lower than the threshold value, the data output from the electronic device is not accumulated in real time. A data transfer device characterized by transferring data with A data transfer device comprising: a device interface unit to which an electronic device is connected; a communication interface unit to which a communication module is connected; and a main control unit having a memory and a processor unit to which the device interface unit and the communication unit are connected A data transfer method in
In the main control unit, receiving data output from the electronic device via the device interface, controlling the communication module connected to the communication interface unit, and transmitting the data;
A step of monitoring the output frequency of data by the electronic device in the main control unit,
In the step of transmitting the data, the main control unit, based on the monitoring result of the output frequency in the step of monitoring the output frequency of the data, a time period in which the data output frequency is higher than a preset threshold value Then, the data output from the electronic device is received and temporarily stored, and the stored data is collectively transferred within a predetermined time from the timing when the data is finally received. A data transfer method comprising transferring data output from the electronic device in real time without accumulating in a time period lower than the threshold value.

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