Abstract: An electronic system comprising a master device and a slave device which are interconnected via a suitable data bus, which have an independent power supply input each, and which exchange data therebetween. Upon judging the slave device to have been switched off, the master device turns off its own power supply in synchronism with the deactivated slave device.

Abstract: The present invention relates to an information processing apparatus and method that enables apparatuses connected to an IEEE 802 network to communicate with one another. A UPnP control point 1 and a UPnP device 2 are connected with an IEEE 802 network 11. When controlling the UPnP device 2, the UPnP control point 1 describes the content of control based on an AV/C command utilized for IEEE 1394. The command based on SOAP is transmitted to UPnP device 2 via the IEEE 802 network 11. The UPnP device 2 extracts the AV/C command from the command based on SOAP and executes a corresponding process. The present invention can be applied in personal computers.

Abstract: An electronic device is connected to a plurality of other electronic devices through an IEEE 1394 bus, and performs data communication with the other electronic devices through the bus. The electronic device includes a storage portion, an interface portion, and a control portion. The interface portion is connected to the bus. The control portion controls the storage portion and the interface portion.

Abstract: For the purpose of easily controlling the transmission of contents among a plurality of AV devices by using a general purpose network, in case of transmitting the contents held in a first device (source) 20 to a second device (sink) 30 by way of a designated transmission path, information relating to the transfer protocol for transmitting the contents is added to each content when the contents information held in the first device 20 is disclosed to a controller 10 on the network, and transmission management is performed based on the information on the transfer protocol added to each content when starting transmission of the contents between the first device 20 and the second device 30,.

Abstract: The present invention relates to an information processing apparatus capable of controlling an AV/C device from a UPnP control point. A UPnP control point 1 is connected with an IEEE 802 network 11, and AV/C devices 3, 4 are connected with IEEE 1394 network 12. The IEEE 802 network 11 and the IEEE 1394 network 12 are connected with each other through a UPnP device 2 functioning as a bridge. The UPnP device 2 converts an SOAP command transmitted from the UPnP control point 1 to an AV/C command to transfer the converted command to an AV/C device 3 through the IEEE 1394 network 12. The present invention can be applied to a personal computer.

Abstract: An UPnP control point is connected to an IEEE802 network, and 1394 equipment is connected to an IEEE1394 network. The IEEE802 network and the IEEE1394 network are connected to each other through an UPnP device functioning as a bridge. The UPnP device receives from a general bus input plug a packet transmitted from the UPnP control point, converts it to a format of the IEEE1394 network, and transmits it from an output plug through the IEEE1394 network to the 1394 equipment. The UPnP device stores the association relationship of the plugs.

Abstract: An electronic device system of the invention has a controlling device and a controlled device interconnected via a data bus which complies with a predetermined communication format and which allows data to be exchanged between the devices. In a command transmission/reception transaction, the controlling device transmits a command to the controlled device. If an interim response is returned from the controlled device, the controlling device regards the transaction as complete and terminates the process without waiting for receipt of a final response from the controlled device.

Abstract: A communication control method and a communication control apparatus are provided for preventing truncation at the beginning upon receipt of data, for example, between devices interconnected through a bus line in conformity to the IEEE 1394 standard.

Abstract: An electronic system comprising a master device and a slave device which are interconnected via a suitable data bus, which have an independent power supply input each, and which exchange data therebetween. Upon judging the slave device to have been switched off, the master device turns off its own power supply in synchronism with the deactivated slave device.

Abstract: There are provided a communication system, a communication device and a communication method that operate with a reduced load when exchanging data streams by way of a network comprising a serial bus. A communication system according to the invention comprises a serial bus 4 for transmitting data, a magneto-optical disc device 1 and/or an optical device 2 for transmitting data to the serial bus 4 as a periodical isochronous packet and an amplifier 3 adapted to monitor the serial bus 4 for the transmission of an isochronous packet from the magneto-optical disc device 1 or the optical device 2 and start receiving the isochronous packet upon detecting the transmission of an isochronous packet that is available to it.

Abstract: A controlling apparatus capable of synchronized power supply control over a plurality of electronic devices which are connected to the controlling apparatus via a bus pursuant to a predetermined communication format and which are fabricated by a plurality of venders including those different from the vender of the controlling apparatus. If any one of the electronic devices is selected regardless of its vender as an input by the controlling apparatus and is judged to have a link only with the controlling apparatus, the electronic device in question is switched on or off synchronously by the controlling apparatus.