JP2008301051A - Digital composite machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital composite machine which can back up power supply by the power supply unit of the composite machine body without increasing the manufacturing cost. <P>SOLUTION: The composite machine body 200 comprises a power supply unit 211 to which power is supplied from a commercial power supply, a charging terminal 205a connected removably with a wireless terminal 300 and delivering the power supply voltage from the power supply unit 211 to the wireless terminal 300, a reverse current prevention diode 212 provided between the power supply unit 211 and the charging terminal 205a in order to pass a current flowing from the power supply unit 211 to the charging terminal 205a and to prevent reverse flow of a current being supplied from the battery 313 of the wireless terminal 300 through the charging terminal 205a when the output voltage from the power supply unit 211 drops, and a circuit connected between the charging terminal 205a and reverse current prevention diode 212 and being supplied with power from the battery 313 through the charging terminal 205a when the output voltage drops. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital multi-function peripheral, and more particularly to an improvement of a digital multi-function peripheral equipped with a wireless terminal capable of wireless communication with the main body of the multi-function peripheral.

  2. Description of the Related Art Conventionally, a copying machine that can notify a portable wireless terminal of a job execution status is known (for example, Patent Document 1). The copying machine described in Patent Document 1 is provided with a wireless terminal having a rechargeable battery and a terminal accommodating portion that detachably accommodates the wireless terminal, and the radio terminal uses a radio wave to complete the copying operation. And a copying machine body for notifying the user. In this copying machine, by holding the wireless terminal, the user can recognize the end of the copying work via the wireless terminal even when the user moves away from the copying machine main body during the copying work. Usually, the battery in the wireless terminal is charged by the power supplied from the copying machine main body when the wireless terminal is accommodated in the terminal accommodating portion.

In addition, in order to prevent data loss, a digital multi-function peripheral provided with a secondary battery that supplies power to a volatile memory at the time of a power failure or the like is also conventionally known (for example, Patent Document 2). The digital multifunction device described in Patent Document 2 is a volatile memory for storing image data and a backup device that supplies power to the volatile memory when the supply of commercial power is interrupted due to a power failure or the like. A secondary battery is provided. In this digital multifunction device, data loss is prevented by supplying power from a secondary battery to volatile memory that requires periodic rewriting (refresh operation) such as DRAM (Dynamic Random Access Memory). Is done.
Japanese Patent Laid-Open No. 10-83131 JP-A-11-127326

  In digital multi-function peripherals such as those described above, the loss of data on the volatile memory is prevented by supplying power from the battery, so if the power outage time is prolonged and the battery is consumed, the data is lost. There was a problem that. Moreover, since it is necessary to newly provide a backup battery for supplying power to the volatile memory when the supply of commercial power is cut off, there is a problem that the manufacturing cost increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a digital multifunction peripheral that can back up the power supply by the power supply device of the multifunction peripheral body without increasing the manufacturing cost. In particular, an object of the present invention is to provide a digital multi-function peripheral that can prevent the loss of data on a volatile memory when the supply of commercial power to a power supply device is interrupted due to a power failure or the like.

  A digital multifunction peripheral according to a first aspect of the present invention is a digital multifunction peripheral including a multifunction peripheral body and a wireless terminal capable of wireless communication between the multifunction peripheral body, and the wireless terminal is connected to the multifunction peripheral body. A battery that is charged by the power supply of the power supply, wherein the MFP body is detachably connected to a power supply device to which commercial power is supplied and the wireless terminal, and outputs a power supply voltage from the power supply device to the wireless terminal And when the output voltage of the power supply device decreases, the battery is provided between the connection terminal, the power supply device, and the connection terminal. Connected between the connection terminal and the backflow prevention means, and when the output voltage decreases, the battery supplies power from the battery via the connection terminal. Configured with a power-supplied circuit being.

  In this digital multi-function peripheral, when the output voltage of the power supply apparatus drops between the connection terminal that outputs the power supply voltage from the power supply apparatus to the wireless terminal and the power supply apparatus, the reverse flow that interrupts the reverse flow of the current supplied from the battery Preventing means is provided, and a powered circuit supplied with power from the battery when the output voltage decreases is connected between the connection terminal and the backflow preventing means. According to such a configuration, when the output voltage of the power supply apparatus decreases, the backflow of the current supplied from the battery via the connection terminal is interrupted, so that the power-fed circuit is properly operated by supplying power from the battery. Can be made. Therefore, it is possible to back up the power supply in the MFP main body without increasing the manufacturing cost as compared to newly providing a backup battery. In addition, since the power supply of the multifunction device main unit is backed up by the battery and the powered circuit is operated, if the supply of commercial power to the power supply unit of the multifunction device main unit is interrupted due to a power failure, etc. Data loss can be prevented.

  According to a second aspect of the present invention, in addition to the above-described configuration, the MFP main body includes a receiving device that receives communication data from an external device via a communication line, and a powered circuit that holds the communication data. A volatile memory, and a writable nonvolatile memory as the powered circuit, wherein the wireless terminal detects the output voltage of the power supply device and a connection connected to the connection terminal When the connection state determination means for determining the state and the wireless terminal are in a connected state and a decrease in the output voltage is detected, the communication data on the volatile memory is read and written to the nonvolatile memory. Main body data backup means. According to such a configuration, when a drop in the output voltage is detected in spite of being connected, the communication data on the volatile memory is written to the nonvolatile memory. When supply of commercial power to the power supply device is interrupted, data on the volatile memory can be saved.

  According to a third aspect of the present invention, there is provided a digital multi-function peripheral including main body memory access means for accessing the memory in the main body of the multi-function peripheral when the wireless terminal detects a decrease in the output voltage, in addition to the above configuration. The connection state determination unit is configured to determine a connection state based on an access result by the main body memory access unit. In this digital multi-function peripheral, when a drop in output voltage is detected, it is determined whether or not it is in a connected state based on the access result to the memory in the main body of the multi-function peripheral, and on the volatile memory based on the determination result. The process of saving the data is performed. According to such a configuration, it is possible to detect from the access result that the output voltage decreases due to the state transition to the non-connected state. Data can be saved.

  According to the digital multifunction peripheral according to the present invention, the power supply from the power supply device of the multifunction peripheral main body is backed up using the power supply from the battery of the wireless terminal, so that compared to newly providing a backup battery, The power supply in the MFP main body can be backed up without increasing the manufacturing cost. In addition, since the power supply of the MFP main body is backed up by a battery and the powered circuit is operated, if the commercial power supply to the MFP main body power supply is interrupted due to a power failure, the data in the volatile memory Can be prevented from disappearing.

  FIG. 1 is a perspective view showing an example of a digital multi-function peripheral according to an embodiment of the present invention. The digital multi-function apparatus includes a multi-function main body 200 and a wireless terminal 300 capable of wireless communication with the multi-function main body 200. The appearance of the machine 100 is shown. The digital multi-function peripheral 100 is a facsimile machine having a scanner function and a printer function, and an input key 202 and an operation display unit 203 are arranged on an operation panel 201 provided in a housing of the multi-function peripheral body 200.

  Further, the MFP main body 200 is provided with a terminal accommodating portion 204 that detachably accommodates the wireless terminal 300.

  The input key 202 is an operation input means for inputting a telephone number or the like, and includes, for example, a numeric keypad and a start key. The operation display unit 203 includes a display device for displaying operation information and a read image, and a touch panel arranged on the display screen. The display device includes, for example, an LCD (Liquid Crystal Display) having a rectangular display screen.

  The terminal accommodating part 204 is a holder for accommodating the rectangular parallelepiped wireless terminal 300, and the connection terminal 205 with the wireless terminal 300 is disposed.

  The wireless terminal 300 is a small portable communication terminal having a rechargeable battery, and can receive a radio signal from the multifunction device main body 200. For example, when a job such as reading of a document, transmission of a read image, or printing of a read image is completed, or when an error occurs during such a job, the execution status of the MFP 200 is displayed. Be notified.

  The battery in the wireless terminal 300 is charged by the electric power supplied from the multifunction device main body 200 when the wireless terminal 300 is accommodated in the terminal accommodating unit 204. The wireless terminal 300 is provided with an LCD 301 for displaying information notified from the MFP main body 200 and a connection terminal 302 for connecting to the MFP main body 200. The connection terminals 205 and 302 are disposed so as to contact each other by accommodating the wireless terminal 300 in the terminal accommodating unit 204.

  FIG. 2 is a block diagram illustrating an example of a schematic configuration of the digital multifunction peripheral 100 of FIG. 1, and illustrates an example of a functional configuration within the multifunction peripheral main body 200. The MFP main body 200 includes an operation display unit 203, a charging terminal 205a, a control terminal 205b, a detection terminal 205c, a bus 210, a power supply device 211, a backflow prevention diode 212, a CPU 213, a driver circuit 214, and an image reading unit 215. , A printing unit 216, a wireless communication unit 217, a power failure drive unit 218, a facsimile communication unit 219, a volatile memory 220, and a nonvolatile memory 221.

  Driver circuit 214, facsimile communication unit 219, image reading unit 215, printing unit 216, operation display unit 203, power failure drive unit 218, control terminal 205b, wireless communication unit 217, volatile memory 220 and nonvolatile memory 221 They are connected to a common bus 210. The CPU 213 is connected to the bus 210 via the driver circuit 214.

  The power supply device 211 is supplied with commercial power from the outside of the digital multifunction peripheral 100 and performs an operation of supplying power to each unit. For example, power is supplied by converting commercial AC power supplied from the outside via a power line into DC.

  Specifically, a part of the output of the power supply device 211 is supplied to the power supply source A, and through this power supply source A, the CPU 213, the driver circuit 214, the image reading unit 215, the printing unit 216, and the detection terminal. Power is supplied to 205c and the wireless communication unit 217. Further, the other part of the output of the power supply device 211 is supplied to the charging terminal 205a, the power failure drive unit 218, and the power supply source B via the backflow prevention diode 212.

  The backflow prevention diode 212 is provided between the power supply device 211 and the charging terminal 205a, and allows the current flowing from the power supply device 211 to the charging terminal 205a to pass. When the output voltage of the power supply device 211 decreases, the reverse current prevention diode 212 is used for charging. This is a backflow prevention means for blocking backflow of current supplied from the battery of the wireless terminal 300 via the terminal 205a.

  Another part of the output of the power supply device 211 is supplied to the facsimile communication unit 219, the operation display unit 203, the volatile memory 220, and the nonvolatile memory 221 via the power supply source B. That is, in this example, the facsimile communication unit 219, the operation display unit 203, the volatile memory 220, the non-volatile memory 221, and the power failure drive unit 218 are connected via the charging terminal 205a when the output voltage of the power supply device 211 decreases. The power supply circuit is powered from the battery of the wireless terminal 300.

  The charging terminal 205 a is a connection terminal 205 to which the wireless terminal 300 is detachably connected, and for outputting the power supply voltage from the power supply device 211 to the wireless terminal 300 accommodated in the terminal accommodating portion 204.

  The control terminal 205 b is a connection terminal 205 that is used when the wireless terminal 300 accommodated in the terminal accommodating unit 204 controls the MFP main body 200. The detection terminal 205 c is a connection terminal 205 that is used when the wireless terminal 300 accommodated in the terminal accommodating unit 204 detects the output voltage of the power supply device 211.

  The facsimile communication unit 219 performs an operation of transmitting / receiving communication data such as image data to / from an external device via a telephone line.

  The image reading unit 215 is an optical reading device that generates a read image by optical reading of a document or the like, and generates image data including pixel data as a read image. For example, the read image is read by irradiating the original with light and scanning the irradiation light.

  The printing unit 216 is an image output device that prints image data received by the facsimile communication unit 219 or image data read from a document by the image reading unit 215 on a sheet of a predetermined size.

  The operation display unit 203 is a user interface including an LCD 203a having a rectangular display screen and a touch panel 203b.

  On the display screen of the LCD 203a, image data received by the facsimile communication unit 219, image data read from the document by the image reading unit 215, and the like are displayed based on a user operation. The touch panel 203b is an operation input device that detects a user operation and performs a predetermined operation input according to an operation position.

  A CPU (Central Processing Unit) 213 is a control device that controls each unit via a driver circuit 214. For example, the communication data received by the facsimile communication unit 219 is transmitted to the printing unit 216 or the operation display unit 203 via the bus 210 or written to the volatile memory 220 via the bus 210. Also, the image data read from the original by the image reading unit 215 is transmitted to the facsimile communication unit 219, the printing unit 216, or the operation display unit 203 via the bus 210, or written to the volatile memory 220 via the bus 210. Is done. In addition, an operation of transmitting image data or communication data read from the volatile memory 220 via the bus 210 to the facsimile communication unit 219, the printing unit 216, or the operation display unit 203 is performed.

  The volatile memory 220 is a memory for holding communication data and the like, and is a memory that needs to be supplied with power for storage and holding. The volatile memory 220 includes a semiconductor storage element such as a DRAM. The nonvolatile memory 221 is a backup memory that is used when data on the volatile memory 220 is saved, and is a writable memory that does not require power supply for storage. For example, a flash memory made of a semiconductor memory element or a magnetic memory device is used as the nonvolatile memory 221.

  The wireless communication unit 217 is a communication device that performs wireless communication with the wireless terminal 300 in order to notify the execution status of a job such as reading a document, transmitting a read image, or printing a read image. Communication data indicating the job execution status is transmitted to the wireless terminal 300 via the antenna 217a.

  The driver circuit 214 is turned off based on the power supply voltage input from the power supply device 211 via the power supply source A, and performs an operation of cutting off the connection between the bus 210 and the CPU 213. That is, the driver circuit 214 is turned on when the output voltage of the power supply device 211 is within a predetermined range, and drives the bus 210 based on control by the CPU 212. On the other hand, when the output voltage of the power supply device 211 decreases beyond a predetermined range, the power supply device 211 is turned off and the connection between the bus 210 and the CPU 213 is cut off.

  When the supply of commercial power is interrupted due to a power failure or the like and the output voltage of the power supply device 211 is reduced, the multifunction device main body 200 operates based on the power supplied from the wireless terminal 300 via the charging terminal 205a. In this case, processing that consumes less power than image reading or printing is continuously executed. For example, transmission / reception of communication data, telephone calls, writing of received data to memory, and transmission / reception of electronic mail are continued if they are being executed when the commercial power supply is shut off. The power failure drive unit 218 performs drive control of each unit when the commercial power supply is cut off. In the power failure drive unit 218, for example, when the output voltage of the power supply device 211 decreases, a control for displaying a message on the LCD 203a for notifying the occurrence of a power supply trouble is performed.

  Further, it is assumed that the MFP main body 200 has a normal mode and a power saving mode in which power consumption is suppressed as compared with the normal mode, and these operation modes can be switched. At that time, the drive target in the power saving mode is not the same as the drive target when the supply of commercial power is interrupted due to a power failure or the like, and the latter is an operation mode that consumes less power than the former. .

  FIG. 3 is a block diagram illustrating an example of a schematic configuration of the digital multifunction peripheral 100 of FIG. 1, and illustrates an example of a functional configuration in the wireless terminal 300. The wireless terminal 300 includes a charging terminal 302a, a control terminal 302b, and a detection terminal 302c, a main control unit 310, a wireless communication unit 311, a notification unit 312 having an LCD 301, a speaker 303, and a vibrator 304, and a battery 313. A driver circuit 314, a main body power supply monitoring unit 315, a connection state determination unit 316, a main body memory access unit 317, and a main body data backup unit 318.

  The charging terminal 302a is detachably connected to the charging terminal of the multifunction device main body 200, and serves as a connection terminal 302 for outputting the power supplied from the multifunction device main body 200 to the battery 313 and the power supply source C. . The output of the battery 313 is supplied to the wireless communication unit 311, the notification unit 312, the main body power supply monitoring unit 315, the connection state determination unit 316, the main body memory access unit 317, and the main body data backup unit 318 via the power supply source C. .

  The control terminal 302 b is a connection terminal 302 that is used when controlling the MFP main body 200, and is connected to the main control unit 310 via the driver circuit 314. The detection terminal 302 c is a connection terminal 302 that is used when detecting the output voltage of the power supply device 211, and is connected to the main body power supply monitoring unit 315.

  The main control unit 310 performs operations to control the wireless communication unit 311, the notification unit 312, the driver circuit 314, the main body power supply monitoring unit 315, the connection state determination unit 316, the main body memory access unit 317, and the main body data backup unit 318. .

  The wireless communication unit 311 is a communication device that performs wireless communication with the MFP main body 200, and receives communication data indicating the job execution status via the antenna 311 a. The notification unit 312 performs an operation of notifying the user of the job execution status based on the communication data received by the wireless communication unit 311.

  For example, a message for notifying the end of the job or the occurrence of an error is displayed on the LCD 301 or a sound is reproduced from the speaker 303. Also, a buzzer sound for notification is output, light is turned on, or the vibrator 304 vibrates.

  The battery 313 is a secondary battery that is charged with electric power supplied from the power supply device 211 of the multifunction peripheral body 200 via the charging terminal 302a.

  The main body power supply monitoring unit 315 detects an output voltage output from the power supply device 211 of the MFP main body 200 via the detection terminal 302c in order to detect the interruption of the commercial power supply due to a power failure or the like, and based on the detection result. The operation of supplying power to the power supply source D is performed.

  The driver circuit 314 is turned on based on the electric power supplied from the main body power supply monitoring unit 315 via the power supply source D, and performs an operation of bringing the connection between the control terminal 302b and the main control unit 310 into a conductive state. . That is, when the driver circuit 314 is turned on from the off state, the bus 210 of the multi-function peripheral body 200 can be accessed.

  The driver circuit 314 is turned on when the output voltage of the power supply device 211 falls below a predetermined range, and drives the bus 210 based on the control by the main control unit 310. On the other hand, when the output voltage of the power supply device 211 is within a predetermined range, the power supply device 211 is turned off, and the connection between the control terminal 302b and the main control unit 310 is cut off.

  That is, when the wireless terminal 300 is accommodated in the terminal accommodating unit 204, the CPU 213 of the multifunction device main body 200 operates as a bus master in a state where the driver circuit 214 is turned on and the driver circuit 314 is turned off. On the other hand, when the driver circuit 214 is turned off and the driver circuit 314 is turned on, the main control unit 310 of the wireless terminal 300 is connected to the bus 210 via the control terminal 302b and operates as a bus master. .

  The main body memory access unit 317 performs an operation of accessing the memory in the multi-function device main body 200 and reading the data in the memory when the output voltage drop is detected by the main body power supply monitoring unit 315. Specifically, data in the volatile memory 220 or the nonvolatile memory 221 specified by a predetermined memory address is read out. This data is read out via the control terminal 302b. For example, an access signal is transmitted to and received from the multi-function device main body 200.

  The connection state determination unit 316 performs an operation of determining the connection state in which the wireless terminal 300 is accommodated in the terminal accommodation unit 204 and connected to the connection terminal 205. Specifically, based on the access result by the main body memory access unit 317, it is determined whether or not the wireless terminal 300 is in a connected state.

  For example, the connection state is determined when data different from the pull-up or pull-down data in the driver circuit 314 is read from the memory in the MFP main body 200. On the other hand, when the data at the time of pull-up or pull-down of the driver circuit 314 is read as it is, it is determined that the connection is not established.

  The main body data backup unit 318 performs an operation of saving data in the memory in order to prevent the data in the multi-function device main body 200 from being lost when the commercial power supply to the multi-function device main body 200 is shut off. Specifically, when the wireless terminal 300 is in a connected state and a decrease in output voltage is detected, an operation of reading data on the volatile memory 220 in the multi-function device main body 200 and writing it to the nonvolatile memory 221 is performed. Done.

  Such processing for saving data in the multifunction device main body 200 is performed via the control terminal 302b, and for example, a backup control signal is output to the multifunction device main body 200.

  Steps S101 to S108 in FIG. 4 are flowcharts illustrating an example of operations in the wireless terminal 300 in FIG. First, the main body power supply monitoring unit 315 monitors the output voltage of the power supply device 211 via the detection terminal 302c and detects whether or not the output voltage has dropped beyond a predetermined range (steps S101 and S102).

  The driver circuit 314 is turned on when a decrease in the output voltage is detected by the main body power supply monitoring unit 315 (step S103). Next, when a decrease in output voltage is detected by the main body power supply monitoring unit 315, the main body memory access unit 317 accesses the memory in the MFP main body 200 and reads data in the memory (steps S104 and S105).

  At this time, if data reading fails, it is determined that the wireless terminal 300 is in a disconnected state, the driver circuit 314 is turned off, and this process ends (steps S106 and S108). On the other hand, when the data reading is successful, the main body data backup unit 318 reads the data on the volatile memory 220 in the multi-function device main body 200 and writes the data in the non-volatile memory 221 (step S107). When the data saving process ends, the driver circuit is turned off and the process ends (step S108).

  According to the present embodiment, the power supply by the power supply device 211 of the MFP main body 200 is backed up using the battery 313 of the wireless terminal 300, so that the manufacturing cost is lower than when a backup battery is newly provided. The power supply in the MFP main body 200 can be backed up without increasing the power. In addition, since the power supply of the MFP main body 200 is backed up by the battery 313, when the commercial power supply to the power supply device 211 of the MFP main body 200 is interrupted due to a power failure or the like, the data in the volatile memory 220 is stored. It can be prevented from disappearing.

  In addition, when a drop in the output voltage is detected in spite of the connection state, the communication data on the volatile memory 220 is written into the nonvolatile memory 221. Therefore, the power supply device 211 of the multifunction device main body 200 due to a power failure or the like. When the supply of commercial power to is interrupted, the data on the volatile memory 220 can be saved.

  In the present embodiment, an example in which the wireless terminal 300 is for notifying the user of the job execution status in the MFP main body 200 has been described, but the present invention is not limited to this. For example, the present invention can also be applied to an apparatus in which the wireless terminal 300 is an operation terminal for remotely operating the MFP main body 200.

  In this embodiment, an example in which wireless communication between the wireless terminal 300 and the MFP main body 200 is performed by transmission and reception of radio waves has been described. However, the present invention is not limited to this, and for example, infrared rays are transmitted. It may be used to perform wireless communication.

  In this embodiment, an example in which communication data is received from an external device via a telephone line has been described, but the present invention is not limited to this. For example, the present invention can be applied to a device that transmits and receives communication data via a communication network such as the Internet or a LAN.

1 is a perspective view illustrating an example of a digital multifunction peripheral according to an embodiment of the present invention, in which a digital multifunction peripheral 100 including a wireless terminal 300 and a multifunction peripheral main body 200 is illustrated. FIG. 2 is a block diagram illustrating an example of a schematic configuration of the digital multifunction peripheral 100 of FIG. 1, in which an example of a functional configuration in the multifunction peripheral main body 200 is illustrated. FIG. 2 is a block diagram illustrating an example of a schematic configuration of the digital multi-function peripheral 100 of FIG. 1, in which an example of a functional configuration in the wireless terminal 300 is illustrated. 4 is a flowchart illustrating an example of an operation in the wireless terminal 300 in FIG. 3.

Explanation of symbols

100 Digital MFP 200 MFP Main Body 201 Operation Panel 202 Input Key 203 Operation Display Unit 203a LCD
203b Touch Panel 204 Terminal Housing 205 Connection Terminal 205a Charging Terminal 205b Control Terminal 205c Detection Terminal 210 Bus 211 Power Supply Device 212 Backflow Prevention Diode 213 CPU
214 Driver circuit 215 Image reading unit 216 Printing unit 217 Wireless communication unit 218 Power failure drive unit 219 Facsimile communication unit 220 Volatile memory 221 Non-volatile memory 300 Wireless terminal 301 LCD
302 Connection terminal 302a Charging terminal 302b Control terminal 302c Detection terminal 310 Main control unit 311 Wireless communication unit 312 Notification unit 313 Battery 314 Driver circuit 315 Main unit power supply monitoring unit 316 Connection state determination unit 317 Main unit memory access unit 318 Main unit data backup Part

Claims (3)

In a digital multifunction peripheral comprising a multifunction peripheral and a wireless terminal capable of wireless communication between the multifunction peripheral,
The wireless terminal includes a battery that is charged by power supply from the MFP main body,
The MFP body includes a power supply device to which commercial power is supplied,
The wireless terminal is detachably connected, and a connection terminal that outputs a power supply voltage from the power supply device to the wireless terminal;
A current that is provided between the power supply device and the connection terminal, passes a current flowing from the power supply device to the connection terminal, and is supplied from the battery via the connection terminal when the output voltage of the power supply device decreases. Backflow prevention means for blocking backflow of
A digital multi-function peripheral comprising: a power-supplied circuit connected between the connection terminal and the backflow prevention means and supplied with power from the battery via the connection terminal when the output voltage decreases. The MFP body receives a communication data from an external device via a communication line, a volatile memory as the powered circuit for holding the communication data, and a non-volatile as a writable powered circuit With memory
The wireless terminal includes a main body power supply monitoring unit that detects an output voltage of the power supply device, a connection state determination unit that determines a connection state connected to the connection terminal, the wireless terminal is in the connection state, and 2. The digital composite according to claim 1, further comprising main body data backup means for reading out communication data on the volatile memory and writing it in the nonvolatile memory when a drop in the output voltage is detected. Machine. The wireless terminal includes a main body memory access means for accessing a memory in the multi-function peripheral when a drop in the output voltage is detected,
3. The digital multi-functional peripheral according to claim 2, wherein the connection state determination unit determines the connection state based on an access result by the main body memory access unit.

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