System having devices connected via communication lines
First Claim
1. A system in which a plurality of devices driven by supply of power are connected, wherein each of at least two devices out of said devices comprises memory means for storing history information of each device under connection in the system, and control means for altering the history information in said memory means when an alteration occurs in a configuration of the system.
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Abstract
Log information disappears when a host device storing the log information, which is histories of respective devices under connection, is disconnected. Further, when USB or the like is used as an interface bus, supplied power has to be limited with consideration to the load on the power supply of the host device.
Therefore, here is a proposal of a system that permits succession of the history information of each device even if any device is disconnected and that permits efficient utilization of power.
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Citations
46 Claims
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1. A system in which a plurality of devices driven by supply of power are connected,
wherein each of at least two devices out of said devices comprises memory means for storing history information of each device under connection in the system, and control means for altering the history information in said memory means when an alteration occurs in a configuration of the system.
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3. A system in which a plurality of devices driven by supply of power are connected,
wherein each of at least two devices out of said devices comprises memory means for storing history information of each device under connection in the system, and control means for altering the history information in said memory means when an alteration occurs in a configuration of the system and for performing such control that a total demanded power of said devices does not exceed a total supplied power.
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13. A control method applied to a system in which a plurality of devices driven by supply of power are connected,
wherein each of at least two devices out of said devices has a memory step of storing history information of each device under connection in the system, and a control step of altering said history information when an alteration occurs in a configuration of the system.
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15. A control method applied to a system in which a plurality of devices driven by supply of power are connected,
wherein each of at least two devices out of said devices has a memory step of storing history information of each device under connection in the system, and a control step of altering said history information when an alteration occurs in a configuration of the system and performing such control that a total demanded power of said devices does not exceed a total supplied power.
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25. A computer-readable memory medium storing a program for carrying out a history information succeeding method applied to a bus system to which a plurality of devices driven by supply of power can be connected,
wherein said history information succession method comprises a memory step of storing the history information of each device under connection to the system, and a control step of altering said history information when an alteration occurs in a configuration of the system.
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26. A computer-readable memory medium storing a program for carrying out a history information succeeding method applied to a bus system to which a plurality of devices driven by supply of power can be connected,
wherein said history information succession method comprises a memory step of storing the history information of each device under connection to the system, and a control step of altering said history information when an alteration occurs in a configuration of the system and performing such control that a total demanded power of said devices does not exceed a total supplied power.
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27. A power control apparatus for a driving device to which power is supplied from a power supplying device which is subject to current limitation at a predetermined current limit value,
said power control apparatus comprising a rechargeable battery, and a charge control part for charging said battery while a current drain is lower than said limit current value, wherein when the current drain exceeds said limit current value, a current is supplied from said battery to said driving device.
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30. A USB apparatus comprising a driving device to which power is supplied from a power supplying device which is subject to current limitation at a predetermined current limit value, and a power control device connected to said power supplying device via a USB connector and arranged to control supply of the power to said driving device,
wherein said power control device comprises a rechargeable battery, and a charge control part for charging said battery while a current drain is lower than said limit current value, and wherein when the current drain exceeds said current limit value, a current is supplied from said battery to said driving device.
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34. A power control method for a driving device to which power is supplied from a power supplying device which is subject to current limitation at a predetermined current limit value, said power control method comprising steps of:
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preparing a rechargeable battery;
charging said battery while a current drain is lower than said current limit value; and
supplying a current from said battery to said driving device when the current drain exceeds said limit current value. - View Dependent Claims (35)
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36. An information processing apparatus comprising:
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means for distributing upstream bus means serially connected to an upstream device, to downstream bus means serially connected to a plurality of downstream devices, wherein when energization from said upstream bus means is present, data from the upstream device is transmitted to said downstream bus means and wherein when the energization from said upstream bus means is absent, said means is connected to an image input/output device connected to said downstream bus means to effect transfer of image data thereto or therefrom. - View Dependent Claims (37, 38, 39, 40)
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41. A display control method comprising steps of:
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preparing means for distributing upstream bus means under one-to-one serial connection to an upstream device, to downstream bus means under one-to-one serial connection to a plurality of downstream devices;
transmitting data from the upstream device to said downstream bus means when energization from said upstream bus means is present;
connecting said means to an image input/output device connected to said downstream bus means to effect transfer of image data thereto or therefrom when the energization from said upstream bus means is absent; and
displaying said image data on a display. - View Dependent Claims (42, 43, 44, 45)
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46. A memory medium storing a program capable of being read by a computer, which executes a display control method with means for distributing upstream bus means under one-to-one serial connection to one upstream device, to downstream bus means under one-to-one serial connection to a plurality of downstream devices, for connecting said means to an image input/output device connected to said downstream bus means and displaying image data thereof on a display, comprising steps of:
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detecting energization from said upstream bus means;
transferring data from the upstream device to said downstream bus means when the energization from said upstream bus means is present, and connecting said means to the image input/output device connected to said downstream bus means to effect transfer of the image data thereto or therefrom when the energization from said upstream bus means is absent; and
displaying said image data on the display.
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Specification