JPH09214623A - Data communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate properly a function to reduce power consumption in the standby state by selecting the standby state depending on whether or not data are stored in a volatile memory. SOLUTION: A 1st control section 10 controls each section of a 1st system and informs an off approval denoting approval of turn-off a power supply section 9 to a 2nd control section 1 via communication interfaces 13,3 when each facsimile operation (image read, copy, recording, transmission and reception) by the 1st system is finished. The 2nd control section 1 transits to a power saving standby state in the case that the power saving standby mode is selected on the condition that a voltage of a secondary battery is normal and the off approval is informed from the 1st control section 10. Since the power saving standby state is not transited when data are stored in a volatile memory (image memory 17) in this way, missing of data from the volatile memory is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication apparatus having a volatile memory for storing data and having a standby mode for reducing power consumption during standby.

[0002]

2. Description of the Related Art Conventionally, for example, in a facsimile machine, there is a system which operates with a small amount of power in a standby state.
In this system, the second control unit controls the start and stop of the main power supply, and the secondary battery supplies the power to the facsimile device during the power saving standby, and the main power supply performs the non-power saving standby. is there. The first control unit is stopped during power saving standby,
Only the second control unit is operating, and low power consumption can be achieved. In addition to the charging status of the secondary battery, key input, off-hook status, etc. as the condition for starting the main power supply, the call signal is detected, but if the call signal is detected, the first control is performed unconditionally. By activating the main power supply and the first control unit based on preset conditions instead of activating the control unit, there is a proposal to reduce power consumption during standby as much as possible and improve operability. Has been done.

Further, there is a facsimile apparatus provided with a DRAM for storing a large amount of image data. This DRA
M is a volatile memory, and although the image data in the DRAM is lost unless the refresh operation is regularly performed, there is an advantage that an inexpensive and large-capacity image memory can be realized.

[0004]

When the above-mentioned power saving standby mode function is provided in a facsimile apparatus having an image memory composed of a DRAM, if there is image data in the DRAM when the apparatus shifts to a standby state, The image data in the DRAM will be lost.

[0005]

According to the present invention, a first standby state in which at least the volatile memory is supplied with power by the power supply means during standby and the data in the memory is held, and a volatile memory by the power supply means during standby. Has a second standby state in which power is not supplied to the volatile memory, and when transitioning to the standby state, when the data is stored in the volatile memory, the first standby mode is selected; A control means for selecting the second standby state when no data is stored therein is provided, and a power saving function for reducing power consumption during standby is provided even when a volatile memory for data storage is provided. It is designed to operate properly.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A facsimile apparatus will be described below as an embodiment of the present invention with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the facsimile apparatus according to this embodiment. In the figure, the facsimile apparatus comprises a first system, a second system, a power supply unit 9 and a secondary battery 9-1.

The second system includes a second control unit 1, a calling signal detection unit 2, a communication interface 3 with the first control unit 10, an operation unit 4, an original detection unit 5, a display unit 6, various state detection units 7, And a time measuring unit 8.

The second control unit 1 is composed of a ROM for reading and writing programs and various variables and constants, a one-chip microcomputer having a built-in RAM, a timer, etc., and the power supplied from the power supply unit 9 or the power supplied from the secondary battery. It is driven by electric power (when the power supply unit 9 is off).

The ringing signal detector 2 detects a ringing signal from the line 20, and when the ringing signal is detected, the second ringing signal is detected.
The detection signal is output to the control unit 1.

The communication interface 3 includes a second controller 1
Is an interface for transmitting and receiving various information to and from the first control unit 10. The various information also includes an activation signal from the second control unit 1 to the first control unit 10.

The operation unit 4 is a start key for starting image transmission, reception, etc., a fine, standard, automatic reception at the time of transmission / reception and an image memory without recording the received image data in the recording unit 12 of the first system. A mode selection key for designating various operation modes such as a memory reception mode stored in 17 and various keys such as a numeric keypad used for dialing and a one-touch dial key are provided, and the input key information is stored in the second control unit. Output to 1.

The document detecting section 5 is the reading section 1 of the first system.
It is detected whether or not the document is set to 1 (document setting state). The set state of the document is detected by a document sensor provided on the document conveyance path of the reading unit 11, and the document detection unit 5 makes a second detection when the document sensor detects the document.
A document detection signal is output to the control unit 1.

The display unit 6 includes a pictogram LCD for displaying 7-segment for clock display and various modes, and a dot matrix L.
LCD module combined with CD and LED
It consists of a pictogram LCD and a dot matrix L.
Each is independent of the CD.

The various state detecting sections 7 include presence / absence of recording paper in the recording section 12, presence / absence of a cartridge, an ink and toner remaining amount detecting section, a hook detecting section of a handset, and a detecting section for detecting a voltage drop of a secondary battery. , A detection unit for a communication request from the personal computer 19 and the like.

The time measuring unit 8 compares and manages the time information sent from the first control unit 10 of the first system and the designated time.

The power supply unit 9 supplies electric power (power supply) to the entire facsimile apparatus, and includes a first system and a second system.
Supply power to the system and charge the secondary battery 9-1. The power supply unit 9 is turned on / off by a start signal and a stop signal from the second control unit.

The secondary battery is charged by the power supply unit 9 when the power supply unit 9 is on, and supplies power to the second system in place of the power supply unit 9 when the power supply unit 9 is off.

When the second control unit 1 is operating with the power from the secondary battery during standby, the second control unit 1 responds to the detection of the voltage drop of the secondary battery 9-1 by the detection unit 7 in response to the power supply unit. 9 is turned on to charge the secondary battery 9-1. And the secondary battery 9
When -1 is charged for a predetermined period, the power supply unit 9 is turned off and the power saving standby state is restored.

The first system also includes a first control unit 10, a reading unit 11, a recording unit 12, a communication interface 13 with the second control unit 1, a communication unit 14, a ROM 15, an encoding / decoding unit 16, and an image memory. A (DRAM) 17 and an interface unit 18 for an external information processing terminal (personal computer or the like).

The first control section 10 is composed of a microcomputer or the like, controls each section of the first system in accordance with a program stored in the ROM 15, and performs a facsimile operation (image reading operation, copy operation, When the recording operation, the transmitting operation, and the receiving operation) are completed, the second control unit 1 is notified of the off permission indicating that the power supply unit 9 may be turned off via the communication interfaces 13 and 3.

The reading unit 11 is composed of a DMA controller, an image processing IC, an image sensor, a CMOS logic IC, etc., and is read by using a reading device such as a contact sensor (CS) under the control of the first control unit 10. The data is binarized and the binarized data is sequentially sent to the image memory 17.

The recording unit 12 is a DMA controller, a recording device such as an ink jet system or a laser beam system, and C
The first control unit 10 includes a MOS logic IC and the like.
Under the control of, the recording data stored in 4 is taken out and recorded and output as a hard copy.

The communication interface 13 is the second controller 1
It is an interface for communication with, and sends and receives various information. The first controller 10 starts the operation of the first system in response to the activation signal from the second controller 1.

The communication unit 14 is composed of G3 and G2 modems and a clock generation circuit connected to these modems, and modulates the transmission data stored in the image memory 17 under the control of the first control unit 10. Then, it is transmitted to the line 20. In addition, an analog signal is input at the time of reception and binarized data obtained by demodulating the signal is stored in the image memory 17.

The image memory 17 is a DRAM module which is a volatile memory. The image memory 17 is binary image data read by the reading unit 11, binary image data recorded by the recording unit 12, or the communication unit 14. Binary image data demodulated and decoded by the encoding / decoding unit 16, or
Encoded image data and external interface 1
Information processing terminal (personal computer) 1 through 8
It stores the reception mode information and the like designated by the reception mode switching instruction sent from the device 9.

External interface (i / f) section 18
Is a personal computer 1 which is an external information processing terminal
9, which is an interface portion for connection with the personal computer 19, commands and data sent from the personal computer 19 are stored in the image memory 17 through this interface, and responses and data sent from the facsimile machine to the personal computer are provided through this interface. And is sent to the personal computer 19 through.

The personal computer 19 sends various commands to the facsimile device,
It also receives responses and data from the facsimile machine. Various commands include a document transmission request, a communication management data acquisition request, a memory reception instruction, and the like, and data include a received image, communication management data, and the like.

Here, a method of supplying power will be described. When the power supply unit 9 is up, its power supply is the most dominant, and power is supplied to the first and second systems. When the power supply unit 9 is not operating, the secondary battery 9-1 supplies power only to the second system.

FIG. 2 is a flow chart showing the control operation of the second control unit 1 of the second system in this embodiment, and FIG. 3 shows the control operation of the first control unit 10 of the first system. It is a flowchart.

When the power supply unit 9 is turned on by a power switch (not shown) which is normally turned on when the apparatus is installed, the power supply unit 9 starts charging the secondary battery 9-1 and the second control unit 1
Supply power to.

As a result, the second controller 1 rises,
The execution of the flow of FIG. 2 is started.

First, in step S1, each part of the second system is initialized. By this initialization, the ON state of the power supply unit 9 is maintained.

Then, in step S2, the operation unit 4
It is determined whether or not the power saving standby mode is selected by the key input of, and if the power saving standby mode is not selected (the normal standby mode is selected), the process proceeds to step S3, and the power saving standby mode is selected. If yes, step S
Proceed to 12.

In the normal standby mode, it is determined in step S3 whether or not the start of the facsimile operation (reading operation, copying operation, recording operation, transmission operation, reception operation) is instructed by the key input of the operation unit 4, In step S4, it is determined whether or not reception is started by the detection of the calling signal from the line 20 by the calling signal detection unit 2, it is determined in step S5 whether or not the original detection unit 5 detects the original, and in step S6 It is determined whether or not it is activated by the setting of timer transmission, and it is determined in step S7 whether or not various states are detected by the detection unit 7, and the communication request from the first control unit 10 is received from the communication interface 3 in step S9. It is determined whether or not. When it is instructed to start the facsimile operation by key input in step S3, in step S8, a communication request is sent to the first control unit 10 via the communication interface 3, and the communication request sent from the first control unit 10 is sent. When receiving the response, the start signal is sent to the first control unit 10, and
Information indicating the type of operation (read, copy, record, send, receive) is sent. Further, when it is determined in step S4 that the reception is in response to the detection of the calling signal, when it is determined that the document is detected in step S5, when it is determined that the timer transmission is started in step S6, and when it is determined that various states are detected in step S7. Also, similarly, the first control unit 10 is notified in step S8.

When a communication request is received from the first control unit 10 in step S9, a response is sent out via the communication interface 3 in step S10, and data (information) from the first control unit 10 is sent. ) To receive. When the power off of the power supply unit 9 is notified from the first control unit 10 by this data reception, the off permission flag of the predetermined area 1 of the RAM in the second control unit 1 is set.

In step S11, display control of the display unit 6 is performed and the process returns to step S2.

In the power saving standby mode, step S
From step 2 to step S12, it is determined whether or not the voltage drop of the secondary battery 9-1 is detected by the detection unit 7 (whether or not the secondary battery 9-1 is in a normal state), and the secondary battery 9 is detected. -1 is not in a normal state, the power supply unit 9 is turned on in step S13 (this starts charging of the secondary battery 9-1), the charge timer is started in step S14, and step S14 is performed.
Proceed to 15. If the secondary battery 9-1 is in a normal state in step S12, the process proceeds to step S15, it is determined whether or not the charging timer has timed out, and if the charging timer has timed out, in step S16, the off permission flag is set. It is determined whether or not is set. If the off permission flag is set in step S16, the power supply unit 9 is turned off in step S17 and the power saving standby state is entered. If the charging timer has not timed out or the off permission flag has not been set, the process proceeds to step S18 and the power saving standby state is not entered.

Steps S18, S19, S20, S21
Then, it is determined whether or not there is a start factor (key input, call signal detection, document detection, timer polling start) that turns on the power supply unit 9 from the power saving standby state, and one of the start factors must also occur. For example, display control (display of date and time, time, etc.) is performed in step S24, and the process returns to step S2. When any activation factor occurs, the power supply unit 9 is turned on in step S22, the off permission flag is reset in step S23, the power saving standby state is shifted to the normal standby state, and the process proceeds to step S3.

As described above, when the power-saving standby mode is selected, the second control unit 1 notifies that the voltage of the secondary battery is in the normal state and the first control unit 10 notifies that the off permission is given. If the voltage of the secondary battery 9-1 drops in the power saving standby state, the power supply unit 9 is turned on to charge the secondary battery 9-1. Next battery 9
When -1 is sufficiently charged, the state shifts to the power saving standby state again. As a result, in the power saving standby state, the power consumption can be reduced to almost 0W.

Further, the first control unit 10 starts the execution of the flow of FIG. 3 in response to the power supply unit 9 being turned on and the power supply by the power supply unit 9 being supplied.

The first control unit 10 initializes each unit of the first system in step M1, determines whether there is a communication request from the second control unit 1 in step M2, and if the communication request is received, the step is executed. At M3, a response is sent out via the communication interface 13 to receive the data (information) from the second control unit 1.

In step M4, it is determined whether or not the reading operation is started according to an instruction from the second controller 1 (or the personal computer 19), and in step M6, the second controller 1 is started.
(Or personal computer 19) determines whether or not the copy operation is started. In step M7-1, the second controller 1 (or personal computer 19)
From the second control unit 1 (or the personal computer 19) to determine whether or not to start the recording operation according to an instruction from M. It is determined whether or not the reception operation is started according to an instruction from the unit 1 (or the personal computer 19), and in step M12, a data transfer process to the personal computer 19 according to the instruction from the second control unit 1 (or the personal computer 19) ( It is determined whether or not the process of transferring the image data of the image memory 17 or the control data to the personal computer 19 is started. In step M14, the presence or absence of a communication request from the personal computer 19 is determined.

In the case of starting the reading operation, the execution of the reading processing task is started in step M5. This reading processing task is processing that is executed in parallel with the flow of FIG. 3, includes control of power supply to the reading unit 11, and is processing that stores the read image data in the image memory. .

When the copy operation is started, step M
At 7, the execution of the copy processing task is started. This copy processing task is also processing that is executed by the first control unit 10 in parallel with the flow of FIG. Is a process in which the image data read by the reading unit 11 is recorded by the recording unit 12 via the image memory 17.

When the recording operation is started, step M7
At -2, the execution of the recording processing task is started. The recording processing task is for recording and outputting image data stored in the image memory 17 and various reports such as a communication management report, and includes control of power supply to the recording unit 12.

When the transmission operation is started, step M9
Starts execution of the transmission processing task. This transmission processing task includes a processing mode in which the image data read by the reading unit 11 is transmitted from the communication unit 14 to the line 20 (read transmission mode), and a processing mode in which the image data in the image memory 17 is transmitted from the communication unit 20 to the line 20. (Memory transmission mode), dialing process, and control of power supply to the communication unit 14 are included.

In the case of starting the receiving operation, step M1
At 1, the execution of the reception processing task is started. This reception processing task is performed by the encoding / decoding unit 16 decoding the image data received from the line 20 by the communication unit 14 and the recording unit 12
Includes a processing mode for recording (reception recording mode), a processing mode for storing image data received from the line 20 by the communication unit 14 in the image memory 17 (memory reception mode), and control of power supply to the communication unit 14.

When the data transfer operation to the personal computer 19 is started, the execution of the data transfer processing task is started in step M13. This data transfer processing task includes a processing mode for transferring the image data received from the line 20 by the communication unit 14 to the personal computer 19 via the image memory 17 and the external interface 18, the image data in the image memory 17 or various reports. It includes a processing mode for transferring data and control information to the personal computer 19.

When the communication request from the personal computer 19 is received, the execution of the data reception processing task is started in step M15. In this data reception processing task, a response is sent from the external interface unit 18 to the personal computer 19, and various commands (memory reception instruction, etc.) from the personal computer 19, image data, data such as a telephone number, etc. are received from the personal computer 19. To do.

The above-mentioned recording processing task, transmission processing task,
The reception processing task, the data transfer processing task, and the data reception processing task are also executed by the first control unit 10 by multitask processing. The first controller 10 is the second controller 1
According to various activation signals, telephone number data and destination name data input by the numeric keypad or one-touch dial key, or various commands from the personal computer 19, which task processing is to be activated is determined. To do. Then, in step M16,
It is determined whether or not any task process is being executed (whether or not all task processes are completed). If any task process is being executed, the process returns to step M2, and all task processes are completed. Yes (there is no task processing in progress)
In that case, the process proceeds to step M17.

In step M17, it is determined whether or not the memory reception mode is set by the instruction (command) from the personal computer 19. In the case of the memory receiving mode instructed by the personal computer 19, the personal computer periodically inquires about the presence or absence of data received in the memory. Therefore, when the facsimile apparatus is set to the power saving standby mode and the data received by the memory is not yet stored in the image memory 17, the facsimile apparatus shifts to the power saving standby state. However, personal computer 1
9 returns from the power saving state to the normal standby state each time it responds to the inquiry of the presence / absence of the data received from the memory 9 when the inquiry period from the personal computer 19 is short. The state time becomes extremely short. Moreover, personal computer 1
The response corresponding to the inquiry from 9 is also delayed.

Therefore, in the present embodiment, when the memory reception mode is set by the instruction from the personal computer 19, the steps from M17 to M2.
The second control unit 1 is not notified that the power supply unit 9 is turned off, and the power saving standby mode is not entered even if the power saving standby mode is selected as the setting of the device. This prevents unnecessary state switching,
Moreover, the inquiry from the personal computer 19 can be promptly answered.

If the memory reception mode is not set in step M17, it is determined in step M18 whether or not unprocessed image data is stored in the image memory 17. As the unprocessed image data, image data for memory transmission, image data for memory-polling, data to be transferred to the personal computer 19, image data received in memory (image data for relay broadcast, confidential received image data) Etc. If the unprocessed image data is stored in the image memory 17, the process returns from step M18 to step M2. If the unprocessed image data is not stored in the image memory 17, the second control unit 19 is powered on in step M19. The off permission of the section 9 is notified and the process returns to step M2.

As described above, the first control unit 10 operates when the facsimile apparatus is set to the memory reception mode in which a communication request is periodically received from the external information processing terminal (personal computer) 19, or the image memory. 1
When the unprocessed image data is stored in 7, the second control unit 1 is not notified that the power supply unit 9 is turned off. As a result, the facsimile apparatus enters the normal standby state even if the power saving standby mode is selected. If neither of the above cases occurs, the facsimile apparatus shifts to the power saving standby state. As a result, it is possible to prevent the image data in the image memory 17 from being lost.

Incidentally, FIG. 4 shows a personal computer 19.
FIG. 6 is a diagram showing a reception mode set by an instruction from.

As shown in FIG. 4, in the receiving mode, the received image is recorded on a sheet of paper as long as there is no trouble.
Then, there are two types of "memory reception" that unconditionally save the received image in the memory. The switching of the reception mode is performed by an instruction from the personal computer 19.

The present invention is not limited to the above-described embodiment, but various modifications can be made.

[0059]

As described above, according to the present invention, in the data communication device in which the power supply to the volatile memory is turned off in the power saving standby state, the power saving is performed when the data is stored in the volatile memory. Since the transition to the standby state (second standby state) is prevented, it is possible to prevent the data in the volatile memory from being lost.

When the communication request from the external information processing terminal is set to the mode in which the communication request is repeatedly made,
Since the transition to the power saving standby state is prevented, useless switching operation of the standby state can be prevented, and moreover, a communication request from an external information processing terminal can be quickly responded to.

[Brief description of drawings]

FIG. 1 is a block diagram of a facsimile apparatus according to the present embodiment.

FIG. 2 is a flowchart showing a control operation of a second controller 1.

FIG. 3 is a flowchart showing a control operation of the first controller 10.

FIG. 4 is a diagram showing a reception mode according to an instruction from a PC.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 2nd control part 2 Calling signal detection part 3 Communication part with 1st control part 4 Operation part 5 Original detection part 6 Display part 7 Various state detection parts 8 Time measurement part 9 Power supply part 10 1st control part 11 Reading part 12 Recording unit 13 Communication unit with second control unit 14 Communication unit 15 ROM 16 Encoding / decoding unit 17 RAM 18 External i / f unit 19 Personal computer

Claims (16)

[Claims] 1. A volatile memory for storing data, a data communication means for communicating data, a power supply means for supplying power to each part of an apparatus including at least the volatile memory, A power supply unit supplies power to at least the volatile memory to retain data in the volatile memory.
And a second standby state in which power is not supplied to the volatile memory by the power supply means, and when data is stored in the volatile memory when transitioning to the standby state, the first state The data communication device, further comprising a control means for selecting the second standby state when data is not stored in the volatile memory. 2. The method according to claim 1, further comprising input means for inputting a memory mode instruction for storing data in the volatile memory, wherein the control means is responsive to the memory mode instruction for the first standby. A data communication device characterized by selecting a mode. 3. The data communication device according to claim 2, wherein the input means inputs an instruction of the memory mode from an external information processing terminal. 4. The power supply means for supplying power to at least the volatile memory and the control means by the power supply means during standby in the first standby state, and the power supply during standby in the second standby state. The data communication device is characterized in that at least power is not supplied to the volatile memory and the control means by means. 5. The data communication device according to claim 2, wherein the memory mode is a mode in which the data received by the data communication unit is stored in the volatile memory. 6. A power source is supplied to the volatile memory during standby.
A first standby state in which data in the volatile memory is retained, and a second standby state in which power is not supplied to the volatile memory during standby.
When the data communication device shifts from the operating state to the standby state when the data is stored in the volatile memory, the first standby state is selected, and
If no data is stored in the volatile memory,
A data communication method comprising selecting the second standby state. 7. The data according to claim 6, wherein a memory mode instruction for storing data in the volatile memory is input, and the first standby mode is selected according to the memory mode instruction. Communication method. 8. The data communication method according to claim 7, wherein the memory mode instruction is input from an external information processing terminal. 9. In a data communication device having a power saving standby state for reducing power consumption during standby and a normal standby state, a volatile memory for storing data, and at least the volatile memory in the normal standby state. A power supply unit that supplies power and stops the power supply to the volatile memory in the power saving standby state, and determines whether or not data is stored in the volatile memory, and determines the power saving according to the determination result. It has a control means for selecting one of a standby state and the normal standby state, the control means, when data is stored in the volatile memory, selects the normal standby state, the data of the volatile memory A data communication device, characterized in that: 10. The interface according to claim 9, further comprising an interface for connecting an external information processing terminal, and means for accepting a communication request from the external information processing terminal in the normal waterfall state, wherein the control means comprises: Data communication characterized by determining whether or not a mode in which a communication request is repeatedly made is selected from the external information processing terminal, and selecting one of the power saving standby state and the normal standby state according to the determination result. apparatus. 11. A data communication apparatus having a power saving standby mode for reducing power consumption during standby, wherein first power supply means is turned off in the power saving standby state, and the first power supply in the power saving standby state. First control means for detecting an activation factor of the means and turning on the first power source means in response to the detection of the activation factor; and a second control means for supplying power to the first control means in the power saving standby state. A power supply unit, a second control unit that is supplied with power by the first power supply unit and controls data communication, and a volatile memory that is supplied with power by the first power supply unit and stores data. The second control means determines whether or not data is stored in the volatile memory, and according to the determination, determines whether or not to shift to the power saving standby state. Communication device. 12. The data storage device according to claim 11, wherein the second control unit does not shift to the power saving standby state when the data is stored in the volatile memory and holds the data in the volatile memory. A data communication device characterized by: 13. The data communication apparatus according to claim 11, wherein the first control means turns off the first power supply means in accordance with an instruction from the second control means. 14. The information processing apparatus according to claim 11, further comprising an interface for connecting an external information processing terminal, wherein the second control unit controls communication with the external information processing terminal, The operation of the device is controlled according to an instruction from the processing terminal, and when the communication request from the external information processing terminal is set to the mode in which the communication request is repeatedly sent, it is possible not to shift to the power saving standby state. Characteristic data communication device. 15. A data communication device having a power saving standby mode for reducing power consumption during standby, and an interface for connecting an external information processing terminal, and first power supply means turned off in the power saving standby state. In the power saving standby state, a first control unit that detects a start factor of the first power source unit and turns on the first power source unit in response to the detection of the start factor; and in the power saving standby state, Second power supply means for supplying power to the first control means, and power supply by the first power supply means for controlling communication with the external information processing terminal via the interface to perform the external information processing. Whether to control the operation of the device according to the instruction from the terminal and to shift to the power saving standby state according to the mode set by the instruction from the external information processing terminal And a second control unit for determining, wherein the second control unit shifts to the power saving standby state when the mode is set to a mode in which a communication request from the external information processing terminal is repeatedly sent. A data communication device characterized by not doing so. 16. The storage device according to claim 15, further comprising a storage unit for storing data, wherein the second control unit stores the data received by an instruction from the external information processing terminal in the storage unit. A data communication device, characterized in that when the memory reception mode is set, the power saving standby state is prevented.