JP2002374268A - Network system, network equipment, exclusive control method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly remote-control operations of object equipment. SOLUTION: An occupancy management processing section 52 records and registers information denoting the release timing of an occupancy right to a release timing registration area 42. Upon the receipt of an occupancy provision request sent from a control unit, the occupancy management processing section 52 discriminates whether or not the section 52 has already provided the occupancy right to other unit. When discriminating not providing the occupancy right, the occupancy management processing section 52 stores a node ID and a unique ID of the control device transmitting the occupancy provision request to an occupancy information storage area 41. Furthermore, the occupancy management processing section 52 discriminates whether or not a release timing comes on the basis of a notice signal sent from a timing detection section 51, and carries out the processing to release the occupancy right, when discriminating the timing comes. Moreover, when a bus reset takes place after the occupancy management processing section 52 provides the occupancy right to the control unit, the occupancy management processing section 52 updates the storage contents of the occupancy information storage area 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a network system, a network device, an exclusive control method, and a program.

[0002]

2. Description of the Related Art In a network system in which a plurality of electronic devices such as AV (audio / video) devices are connected, one of the electronic devices is used as a control device, and another electronic device which is a target device by the control device. In some cases, the operation of electronic devices is remotely controlled. In a network system configured by connecting a large number of electronic devices, there are a plurality of such control devices and target devices, and network management may be complicated. In this case, in order to surely remotely control the operation of the target device by the control device, it has been considered to give the control device an exclusive right to exclusively control the operation of the target device. That is, each target device sets an occupation authority by limiting the control device that remotely controls the operation of the target device to any one of the plurality of control devices, and controls devices other than the control device having the occupation authority. Refuse to execute the process according to the command sent from

[0003]

In the above prior art, the occupation authority granted by the target device is released by a command from the control device to which the occupation authority has been granted and exclusive remote control of the target device has been enabled. To return to a state where remote control by another control device is possible. Therefore, after the exclusive right is given to the control device, the exclusive right is not released until there is a command from the control device to which the exclusive right is given. In this case, if the user of the control device forgets the operation for releasing the exclusive right, there is a problem that remote control by another control device becomes impossible.

In an interface standard called IEEE 1394, a bus reset occurs in response to a connection of a new device, a disconnection of a bus cable connected to the device, and the like. Will be released. Therefore, the occupation authority may be released at a timing not intended by the user, and the occupation authority may be set to another control device. If the occupation authority is transferred at an unclear timing such as a bus reset, there is a problem that the operation of the target device cannot be remotely controlled against the intention of the user, and the convenience of the system is reduced.

[0005] The present invention has been made in view of the above situation, and has as its object to provide a network system capable of appropriately exclusively controlling the operation of a target device.

[0006]

In order to achieve the above object, a network system according to a first aspect of the present invention comprises a plurality of electronic devices including a control device and a target device connected to a network. And an occupancy management means for providing the control device with an occupancy right for exclusively remotely controlling the operation of the target device in response to the occupancy grant request transmitted from the control device. An occupation device specifying unit that specifies a control device to which the occupation management unit has given the occupation right; a release setting unit that sets release timing of the occupation right given to the control device by the occupation management unit; Timing detecting means for detecting that the release timing set by the means has arrived; and Wherein the occupation management means, when the timing detection means detects the release timing and release the occupied privilege granted to the control device identified by the occupation device specifying means, and wherein the.

[0007] It is preferable that the apparatus further comprises a processing executing means for executing a predetermined remote control processing in accordance with a control signal transmitted from the control device specified by the occupied device specifying means.

[0008] Upon receiving the control signal transmitted from the control device, the processing execution means determines whether or not the control device from which the control signal is transmitted is the control device specified by the occupied device specifying means. If it is determined that the control device is not the specified control device, it is desirable to transmit a response signal indicating that command execution is rejected in response to the received control signal.

The occupancy management means, upon receiving the occupancy grant request transmitted from the control device, determines whether or not the control device specified by the occupancy device identification means exists. In response to the occupation grant request, it is desirable to transmit a response signal indicating that the grant of the occupation authority is refused.

[0010] It is preferable that the occupied device specifying means can specify the control device to which the occupation authority is given by storing the node identification information assigned to the control device.

When the bus reset occurs, the occupancy management means updates the node identification information stored in the occupancy device identification means to the node identification information newly assigned to the control device to which the occupation authority is given. It is desirable to do.

It is desirable that a plurality of electronic devices be connected to a network by an IEEE 1394 interface.

A network device according to a second aspect of the present invention is a network device connected to a control device via a network, and exclusively controls its own operation in response to an occupancy grant request transmitted from the control device. Occupancy management means for giving an occupation right for remote control to the control device, occupation device identification means for specifying the control device to which the occupation management device has given the occupation authority, and Release setting means for setting the release timing of the occupation authority granted to, and timing detection means for detecting that the release timing set by the release setting means has arrived, wherein the occupation management means When the detecting unit detects the release timing, the release timing is specified by the occupied device specifying unit. Releasing the occupied privilege granted to the control device, characterized in that.

An exclusive control method according to a third aspect of the present invention is an exclusive control method in a network system in which a plurality of electronic devices including a control device and a target device are connected to a network. In response to the occupancy grant request transmitted from the control device, the occupancy right granting step of granting the control device an occupancy right exclusively for remotely controlling the operation of the own device, An occupation device specifying step of specifying the control device to which the occupation authority has been given, a release setting step of setting release timing of the occupation authority given to the control device in the occupation authority grant step, and the release setting step. To detect when the set release timing has arrived Executing a detection step and, when the release timing is detected in the timing detection step, an occupation right release step of releasing the occupation right given to the control device specified in the occupation device specification step. It is characterized by.

[0015] A program according to a fourth aspect of the present invention provides a computer, which functions as an electronic device to be remotely controlled from a control device connected to a network, in response to an occupancy grant request transmitted from the control device. An occupation authority granting process for granting an occupation authority for exclusively remote controlling the operation of the own device to the control device; and an occupation device for identifying the control device to which the occupation authority has been granted by the occupation authority granting process. Specific processing, release setting processing for setting release timing of the exclusive right granted to the control device by the exclusive right grant processing, and timing detection processing for detecting that the release timing set by the release setting processing has arrived When the release timing is detected by the timing detection process. And occupation authority release process for releasing the occupied privilege granted to the control device identified by the occupation device identification process is executed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a network system according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of a network system applied to an embodiment of the present invention. This network system includes, for example, two control devices 11 and 12 and three target devices 13 to 15.
Are connected via a bus cable 16. In the network system shown in FIG. 1, two control devices 11 and 12 and three target devices 13
To 15 are connected in a daisy chain via a bus cable 16 to enable serial bidirectional communication using packets. In addition, each device may be branched and connected in a tree shape via the bus cable 16.

The control devices 11 and 12 are, for example,
It is composed of a personal computer (PC), a DTV (digital television receiver), or the like, and transmits a control signal including a command for remotely controlling the operation of target devices 13 to 15 to be controlled. The control signals transmitted from the control devices 11 and 12 are transmitted through the bus cable 1
Target devices 13 to 13 connected to a network by 6
15 is transferred. The target devices 13 to 15 are AV (audio / video) devices including, for example, a DVCR (digital video camcorder), a DVD player, and an MD player, and respond to control signals from control devices 11 and 12 connected to a network. Work. Note that each device constituting the network system is not limited to these devices as long as the device can be connected to the network via the bus cable 16 (for example, a digital still camera, a printer, a scanner, etc.). It may be.

The control devices 11 and 12 and the target devices 13 to 15 each include, for example, a physical layer 1, a link layer 2, and a transaction layer 3 as shown in FIG. 2, and include, for example, an IEEE 1394 interface (IEEE 1394 bus). Configure the serial bus interface. The control devices 11 and 12 and the target devices 13 to 15 are respectively IEEE1
A serial bus interface such as a 394 interface is connected to other devices via the bus cable 16 via a network.

The physical layer 1 performs an encoding process, a decoding process, a bus arbitration process, and the like of data transmitted to and from another device connected via the bus cable 16. The link layer 2 performs transmission / reception of packets, cycle control, and the like via the physical layer 1.
The transaction layer 3 sends and receives commands via the physical layer 1 and the link layer 2.

The target devices 13 to 15 are shown in FIG.
And a processing control unit 5 as shown in FIG.

The storage unit 4 is a ROM (Read Only Memory)
, A RAM (Random Access Memory) and the like, and stores an operation program and data executed by the processing control unit 5.
Here, as shown in FIG. 4, the storage unit 4 includes an occupation information storage area 41, a release timing registration area 42, and a table storage area 43.

The occupation information storage area 41 is for storing information relating to the occupation authority set for the control devices 11 and 12 that exclusively and remotely control the operation of the target devices 13 to 15 in each of the target devices 13 to 15. is there. For example, the occupation information storage area 41 stores the control device 1
Node ID of the device to which exclusive right has been granted among 1, 12
Further, a unique ID called a GUID (Global Unique IDentifier) is stored. Here, the node ID is node identification information that is set for each device at a predetermined timing in the network system and is used for managing each device. The unique ID is set uniquely by a manufacturer or the like that manufactures the control devices 11 and 12 and the target devices 13 to 15 according to a predetermined rule.
ad Only Memory), and is used to identify each device.

The release timing registration area 42 registers, at each of the target devices 13 to 15, the timing at which the exclusive right set for the control device 11 or the control device 12 that exclusively remotely controls the operation of its own device is released. It is an area for. Here, the timing of releasing the occupation authority given to any of the control devices 11 and 12 can be set independently in each of the target devices 13 to 15. For example, the target device 13
Is a DVCR, and when a video signal or an audio signal is recorded in accordance with the DVHS system, the target device 13
Can set the time when the information recording for one program is completed as the release timing of the exclusive right. Further, for example, when the target device 14 is a DVD player, the target device 14 can set the point at which the chapter is switched in the DVD being played as release timing of the exclusive right. In addition, a point in time when a command to turn off the power of the target devices 13 to 15 or a point in time when the recording / reproducing operation is stopped can be set as the release timing of the occupation authority.

The table storage area 43 stores a correspondence table that defines the correspondence between the node ID of each device in the network system and the unique ID for specifying each device. A predetermined initial value is set in the occupation information storage area 41, the release timing registration area 42, and the table storage area 43 when the power of each of the target devices 13 to 15 is turned on. A correspondence table or the like created by execution of processing or the like is stored.

The processing control unit 5 shown in FIG. 3 is constructed, for example, by a microprocessor for communication processing executing an internal program such as firmware, and as shown in FIG. And a management processing unit 52.

The timing detecting section 51 detects that the release timing of the exclusive right registered in the release timing registration area 42 has arrived. That is,
The timing detection unit 51 includes the target devices 13 to 15
In, for example, the switching of the recording / reproducing operation, the presence / absence of a command to turn off the power, and the like are monitored to detect that the release timing of the exclusive right has come.

The occupancy management processor 52 manages the setting and release of the occupation authority in each of the target devices 13 to 15. For example, when the occupation management processing unit 52 receives a command to start occupation by a control signal received from the control device 11 or 12 via the bus cable 16, the occupation management processing unit 52 records predetermined information in the occupation information storage area 41 and Set. In addition, the occupancy management processing unit 52 initializes the storage contents of the occupation information storage area 41 in response to the control signal received from the control devices 11 and 12 and the timing detection unit 51 detecting the release timing of the occupation authority. Release the exclusive right.

The operation of the network system according to the embodiment of the present invention will be described below.

In this network system, each of the target devices 13 to 15 responds to a bus reset that occurs when the power is turned on, when a new device is connected, or when the bus cable 16 is disconnected from each device. , The correspondence table creation process shown in the flowchart of FIG.

That is, each of the target devices 13 to 15
Receives a self ID (Self ID) packet sent from each device (step S1).

Each of the target devices 13 to 15 specifies the total number of nodes, which is the total number of devices constituting the network system, based on the number of received self ID packets, and sets the number to a constant M. In addition, each of the target devices 13 to 15
Sets "0" as an initial value in a variable N (step S2).

Each of the target devices 13 to 15 acquires the unique ID of the node N indicated by the variable N (step S3). Here, each of the target devices 13 to 15
By reading the configuration ROM (not shown) of the node N in Transaction, the unique ID of the node N can be obtained.

Each of the target devices 13 to 15 increments the variable N by 1 (step S4), and determines whether or not the variable N is equal to a constant M (step S5). That is, each of the target devices 13 to 15 determines whether the unique ID has been acquired from all the devices. When each of the target devices 13 to 15 determines that the unique ID has not been obtained from all the devices, the process returns to step S3 and repeats the processes of steps S3 to S5.

On the other hand, when it is determined that unique IDs have been obtained from all devices, each of the target devices 13 to 15
A correspondence table between the acquired node ID and the unique ID is created (step S6). Thereby, the target devices 13 to 15 store the correspondence tables in the table storage area 43 of the storage unit 4, respectively, and can specify the network configuration. When the correspondence table is created in this way, each of the target devices 13 to 15 ends the correspondence table creation processing.

As a result, a correspondence table is created in which a unique ID is assigned in correspondence with the node ID of each device in the network after the bus reset, and the created correspondence table is stored in each storage unit 4 of the target devices 13 to 15. Is done.

In this network system, each of the target devices 13 to 15 uses the release timing registration area 42 to independently set the timing for releasing the exclusive right. That is, the occupation management processing unit 52 provided in each of the target devices 13 to 15 indicates the release timing of the occupation authority according to the instruction information input in response to the user operating the key input unit (not shown). The information is recorded and registered in the release timing registration area 42. Here, the occupation management processing unit 52 may register the release timing of the occupation authority according to a control signal received from the control devices 11 and 12 via the bus cable 16. Thus, each target device 13
15 to 15, the occupation management processing unit 52 sets the release timing of the occupation authority in advance using the release timing registration area 42.

FIG. 6 is a flowchart for explaining the exclusive authority granting process executed by each of the target devices 13 to 15. The occupation authority granting process shown in FIG.
This is a process for granting an exclusive right that enables exclusive remote control of the own device. The process control unit 5 starts the occupation authority granting process by executing the operation program stored in the storage unit 4.

When the target devices 13 to 15 receive the occupancy grant request transmitted from the control device 11 or the control device 12 (step S11), the occupancy management processing section 52 has already granted the occupancy authority to the other devices. It is determined whether or not there is (step S12). For example, the occupation management processing unit 52 checks the storage content of the occupation information storage area 41, and if any data is stored except for the occupation information indicating the device that is the transmission source of the occupation assignment request and the initial data, It is determined that the exclusive right has been granted to another device.

When the occupation management processing section 52 determines that the occupation authority has been granted to another device (step S12).
YES), a response signal (response) to reject the grant of the exclusive right is created in response to the exclusive grant request.
The occupation management processing unit 52 transmits the created response signal to the control device 11 or the control device 12 that is the transmission source of the occupation grant request (Step S13).

On the other hand, when the occupation management processing section 52 determines that the occupation authority has not been granted (N in step S12).
O), the node ID and the unique ID of the control device 11 or the control device 12 that transmitted the occupancy grant request
Is stored in the occupation information storage area 41 (step S1).
4). As a result, the target devices 13 to 15 that have received the occupancy grant request enter an occupied state in which occupation authority has been granted to the control device 11 or the control device 12 that transmitted the occupancy grant request (step S15). 11 or the control device 12 enables exclusive remote control.

FIG. 7 is a flowchart for explaining the operation of the target devices 13 to 15 which have been given occupation authority to any one of the control devices 11 and 12. The processing control unit 5 starts this operation by executing the operation program stored in the storage unit 4.

In this case, the target devices 13 to 15
The processing control unit 5 determines whether a control signal transmitted from the control devices 11 and 12 has been received (step S21), and determines that the control signal has not been received (step S21).
(NO at 21), execute loop processing and wait. At this time, the process control unit 5 determines whether or not the control signal transmitted from the control devices 11 and 12 has been received by reading the source address included in the packet data received via the bus cable 16, for example. Determine.

On the other hand, when the target devices 13 to 15 determine that the control signal has been received (YE in step S21).
S), it is determined whether or not the control device 11 or the control device 12 as the transmission source of the control signal has been given the exclusive right (step S22). More specifically, in the target devices 13 to 15, the processing control unit 5
Specifies the node ID of the control device 11, 12 that is the source of the control signal from the information included in the control signal sent from the control device 11, 12. Further, the processing control unit 5 determines from the storage content of the occupation information storage area 41
The node ID of the device to which the occupation authority is given is specified. By comparing these specified node IDs, the processing control unit 5 determines whether or not one of the control devices 11 and 12 that are the transmission sources of the control signal has been given the exclusive right. That is, when the compared node IDs match, the processing control unit 5 determines that the exclusive right has been granted, and when they do not match, it determines that the exclusive right has not been granted.

When the target devices 13 to 15 determine that the control device 11 or the control device 12 as the transmission source of the control signal has been given the exclusive right (YES in step S22), the target device 13 to 15 responds to the received control signal. It operates according to the included command (step S23).
That is, in the target devices 13 to 15, the processing control unit 5 executes the remote control process according to the command included in the received control signal, and
5 is controlled.

On the other hand, when the target devices 13 to 15 determine that the control device 11 or the control device 12 that is the source of the control signal has not been given the exclusive right (NO in step S22), the received control device In response to the signal, a response signal (response) to reject execution of the command is created. Target devices 13-15
Transmits the created response signal to the control device 11 or the control device 12 that is the transmission source of the control signal (step S24). In this way, the target devices 13 to 15 operate only according to the commands issued by the control device 11 or the control device 12 to which the occupation authority is given. This enables exclusive remote control by the control device 11 or the control device 12 to which the occupation authority has been given.

Here, each of the target devices 13 to 15 is controlled by the control device 11 or the control device 12 based on the storage contents of the release timing registration area 42.
Can be independently released. FIG. 8 is a flowchart illustrating the exclusive authority release processing executed by the target devices 13 to 15. The occupation authority release process shown in FIG. 8 is performed by automatically detecting the arrival of a preset release timing in the target devices 13 to 15 to which the occupation authority has been assigned to the control device 11 or the control device 12 and automatically changing the occupation authority. This is processing for releasing. The processing control unit 5 starts the exclusive right release processing by executing the operation program stored in the storage unit 4.

In each of the target devices 13 to 15, when detecting that the release timing registered in the release timing registration area 42 has arrived, the timing detection section 51 notifies the occupation management processing section 52 of the arrival of the release timing. Send notification signal. The occupancy management processing unit 52, based on the notification signal sent from the timing detection unit 51,
It is determined whether or not the release timing has come (step S
31), when it is determined that it has not arrived (step S31)
NO), execute a loop process and wait.

On the other hand, when the occupancy management processing section 52 determines that the release timing has come (YE in step S31).
S), a process for releasing the exclusive right is executed (step S32). For example, the occupation management processing unit 52 stores the occupation information (node I
D, unique ID, etc.) and erased and initialized, and set to an operable state according to a command included in a control signal received from any device. In this way, the target devices 13 to 15 to which the exclusive right has been assigned automatically return to the state where the exclusive right has been released when the preset release timing comes (step S33).

FIG. 9 is a flowchart showing the processing performed by the target device when a bus reset occurs after the exclusive right is given to the control device 11 or the control device 12 by executing the exclusive right grant process shown in the flowchart of FIG. It is a flowchart explaining operation | movement of 13-15.

In this case, the target devices 13 to 15
It is determined whether or not a bus reset has occurred (step S4).
1) If it is determined that the error has not occurred (NO in step S41), a loop process is executed and the process waits.

On the other hand, when the target devices 13 to 15 determine that a bus reset has occurred (YES in step S41), the occupation management processing unit 52 updates the storage contents of the occupation information storage area 41 and grants the occupation authority. The newly assigned node ID is stored in the control device 11 or the control device 12 (step S4).
2). That is, when a bus reset occurs while the occupation authority is set, the target devices 13 to 15 acquire the correspondence table created by executing the correspondence table creation processing shown in the flowchart of FIG.
The occupation information stored in the occupation information storage area 41 is updated. As a result, information on the device to which the occupation authority has been given is appropriately managed, and appropriate exclusive control by the control device 11 or the control device 12 is enabled.

As described above, each of the target devices 13 to 15
Sets in advance the timing of releasing the occupation authority, and upon detecting that the release timing has arrived, automatically releases the occupation authority and enables remote control of the operation by the control device 11 and the control device 12. . Accordingly, even when the user of the control device 11 or the control device 12 forgets to release the occupation authority given by the target devices 13 to 15, the occupation authority is independently released on the side of the target devices 13 to 15. be able to. In this way, the operations of the target devices 13 to 15, which are the target devices, can be appropriately remotely controlled, and the convenience of the network system can be improved.

When a bus reset occurs,
By updating the storage contents of the occupation information storage area 41 without releasing the occupation authority, it is possible to register a newly assigned node ID with respect to the control device 11 or the control device 12 to which the occupation authority is given. it can. Thus, it is possible to prevent the exclusive right from being released against the user of the control device 11 or the control device 12 to which the exclusive right is given. In this way, the operations of the target devices 13 to 15, which are the target devices, can be appropriately remotely controlled, and the convenience of the network system can be improved.

In the present invention, each device is an IEEE13
The present invention is not limited to the case where a network connection is made using the 94 interface, and can be applied to any network system that enables remote control by connecting a plurality of electronic devices to a network. The devices are not limited to those connected using a bus cable, but may be connected to a network using a wireless signal, for example.

Further, the processing for creating the correspondence table by each of the target devices 13 to 15 can be arbitrarily changed. That is, for example, any one of the control devices 11 and 12 and the target devices 13 to 15 is set as a root device, and the root device creates a correspondence table using a unique ID acquired from each device, and May be broadcast.

In the above embodiment, the operation program is described as being stored in the storage unit 4 in advance, but the present invention is not limited to this. That is, the operation program may be recorded on a computer-readable recording medium such as an FD, a CD-ROM, or an IC memory and distributed. Further, the information may be recorded in a disk device or the like of a server device on the Internet, and may be downloaded to a computer functioning as an electronic device serving as a target device, for example, by superimposing it on a carrier wave.

[0058]

According to the present invention, the operation of the target device can be appropriately remote-controlled.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a configuration of a network system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an IEEE1394 interface.

FIG. 3 is a diagram illustrating a configuration of a target device.

FIG. 4 is a diagram illustrating a configuration of a storage unit and a processing control unit.

FIG. 5 is a flowchart illustrating a correspondence table creation process.

FIG. 6 is a flowchart illustrating an occupation authority granting process.

FIG. 7 is a flowchart for explaining the operation of a target device to which an occupation right has been assigned.

FIG. 8 is a flowchart illustrating an exclusive authority release process.

FIG. 9 is a flowchart illustrating an operation when a bus reset occurs.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Physical layer 2 Link layer 3 Transaction layer 4 Storage part 5 Processing control part 11, 12 Control equipment 13-15 Target equipment 16 Bus cable 41 Occupation information storage area 42 Release timing registration area 43 Table storage area 51 Timing detection part 52 Occupancy management Processing unit

Claims (10)

[Claims] 1. A network system comprising a plurality of electronic devices including a control device and a target device connected to a network, wherein the target device responds to an occupancy grant request transmitted from the control device. Occupancy management means for giving an exclusive right to exclusively control the operation of the control device to the control device; occupied device specifying means for specifying the control device to which the occupation management device has given the exclusive right; Release control means for setting release timing of the occupation authority given to the control device by the control means, and timing detection means for detecting that the release timing set by the release setting means has arrived, Means for detecting the release timing when the timing detection means detects the release timing. Network system according to claim releasing the occupied privilege granted to the control device identified, that the device specifying means. 2. The network according to claim 1, further comprising a processing execution unit that executes a predetermined remote control process in accordance with a control signal transmitted from the control device specified by the occupied device specifying unit. system. 3. The process executing means, upon receiving a control signal transmitted from the control device, determines whether or not the control device, which is the source of the control signal, is the control device specified by the occupied device specifying means. 3. The network system according to claim 2, wherein, if it is determined that the control device is not the specified control device, a response signal for rejecting command execution is transmitted in response to the received control signal. . 4. The occupancy management means, upon receiving an occupancy grant request transmitted from a control device, determines whether or not the control device specified by the occupancy device identification means exists. 4. The network system according to claim 1, wherein a response signal is transmitted in response to the received occupancy grant request, the response signal rejecting the grant of occupation authority. 5. The occupied device specifying means, by storing node identification information assigned to the control device, can specify the control device to which the occupation authority is given. The network system according to any one of claims 1 to 4, wherein 6. The occupancy management means, when a bus reset occurs, replaces the node identification information stored in the occupation device identification means with node identification information newly assigned to the control device to which the occupation authority is assigned. The network system according to claim 5, wherein: 7. The network system according to claim 1, wherein the plurality of electronic devices are connected to a network via an IEEE 1394 interface. 8. A network device connected to a control device via a network, wherein the control device controls an exclusive right to exclusively remotely control an operation of the own device in response to an occupation grant request transmitted from the control device. An occupancy management unit to be assigned to the device; an occupancy device identification unit to identify the control device to which the occupation management unit has assigned the occupation authority; and a release timing of the occupation authority assigned to the control device by the occupation management unit. Release setting means for setting, and timing detection means for detecting that the release timing set by the release setting means has arrived, wherein the occupancy management means, when the timing detection means detects the release timing, the occupancy Exclusive authority granted to the control device specified by the device specifying means Releasing, network devices, characterized in that. 9. An exclusive control method in a network system in which a plurality of electronic devices including a control device and a target device are connected to a network, wherein the target device responds to an occupancy grant request transmitted from the control device. An exclusive right granting step of giving exclusive control to the control device exclusively for remotely controlling the operation of the own device; and specifying the control device to which the exclusive right has been given in the exclusive right granting step. An occupation device specifying step, a release setting step for setting release timing of the occupation authority granted to the control device in the occupation authority grant step, and detecting that the release timing set in the release setting step has arrived. Timing detecting step, Exclusive release control for releasing the exclusive right granted to the control device specified in the exclusive device specifying step when the release timing is detected in the exclusive control. Method. 10. A computer functioning as an electronic device to be remotely controlled by a control device connected to a network, by exclusively controlling the operation of its own device in response to an occupancy grant request transmitted from the control device. An occupation authority granting process for granting an occupation right to control to the control device; an occupation device identification process for identifying the control device to which the occupation authority has been given by the occupation authority granting process; Release setting processing for setting release timing of the exclusive right granted to the control device; timing detection processing for detecting that the release timing set by the release setting processing has arrived; and release timing by the timing detection processing. If detected, the device is identified by the occupied device identification process. Program for executing the occupation authority release process, the releasing the occupied privilege granted against that control instrument.