Patent ID: 7757105
Filing Date: 2010-07-13
Classification: G06F,H04L,Y02D

Abstract:
1. An electronic device system in which a plurality of electronic devices each comprising an IEEE 1394 serial interface having an AV/C Digital Interface Command Set (hereinafter referred to as an AV/C command) are networked via an IEEE 1394 serial bus, wherein the plurality of electronic devices include a controller on the network and a target device for which the controller performs power control, wherein the controller comprises: command sending means for sequentially sending via the bus a power control command to change power status of the target device between power-on state and power-off state and a power status command to inquire the power status of the target device; change time calculating means for calculating power status change time needed for the target device to change the power status between the power-on state and the power-off state based on a response to the power status command that is received from the target device; storage means for storing the power status change time calculated by the change time calculating means; and time interval determining means for determining a time interval from sending of the power control command to sending of the power status command based on the power status change time stored in the storage means when the controller performs power control for a second or subsequent time.