System having devices connected via communication lines
AssigneeCanon Kabushiki Kaisha
InventorsKenichiro Ono, Yoshikazu Shibamiya, Tatsuya Nakajima
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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.
Claims17
A system in which a plurality of devices driven by supply of power are connected, each of at least two devices out of the plurality of devices comprising:
- memory means for storing common history information of each device connected to said system;
- and
- first control means for altering, when the present device configuration of said system is altered to a new device configuration, the common history information of the present device configuration in all of said memory means to new common history information reflecting the new device configuration.
A control method applied to a system in which a plurality of devices driven by supply of power are connected, comprising:
- a memory step of storing common history information of each device connected to the system in memory means of at least two devices out of the plurality of devices;
- and
- a first control step of altering, when the present device configuration of the system is altered to a new device configuration, the common history information of the present device configuration in all of the memory means to new common history information reflecting the new device configuration.
A computer-readable memory medium storing a program for controlling a system in which a plurality of devices driven by supply of power are connected, comprising:
- a memory step of storing common history information of each device connected to the system in memory means of at least two devices out of the plurality of devices;
- and
- a first control step of altering, when the present device configuration of the system is altered to a new device configuration, the history information of the present device configuration in all of the memory means to new common history information reflecting the new device configuration.
Dependencies are inferred from the claim text.