JP3540638B2 - Computer and program recording medium - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, a computer connected to the IEEE 1394 bus identifies a terminal device connected to the IEEE 1394 bus. Computer and program recording medium It is about.
[0002]
[Prior art]
With the improvement of LSI technology, networks for digitizing and transmitting video information and audio information are being developed. Since video signals and audio signals need to be reproduced in real time, a network capable of real-time transmission is required.
[0003]
As a network suitable for such real-time transmission, a network called IEEE 1394 has been proposed. IEEE 1394 is a serial high-speed bus system that can transmit data synchronously, so that real-time transmission is possible.
[0004]
IEEE 1394 is mounted as an external interface in many digital video and audio devices, including a home digital VCR (hereinafter referred to as DV). For example, in the case of a DV, the use of IEEE 1394 makes it possible to control the operation of the DV from an external device, transmit data from the external device to the DV, and record and / or reproduce the DV.
[0005]
On the other hand, in a personal computer (hereinafter referred to as a PC), IEEE1394 is officially supported by Microsoft Windows 98, which is a standard OS, and IEEE1394 is rapidly spreading in the PC world.
[0006]
For this reason, the integration of a PC and a digital video / audio device such as a DV has been promoted.
[0007]
Now, a method of controlling the operation of the DV from the PC and a method of transmitting data from the PC to the DV and reproducing the data on the DV will be described with reference to FIGS.
[0008]
FIG. 9 is an example of a PC and a DV connected to the IEEE 1394 bus. 9, 103 is an IEEE 1394 bus, 104 and 504a and 504b are IEEE 1394 interfaces, 108, 108a and 108b are commands, 109 is a device number, 301 is a PC, 502a and 502b are DV, 503a and 503b are recording / reproducing circuits, and 505 Is data, 506a is a monitor, and 507a is a reproduced video.
[0009]
FIG. 10 is an example of node IDs and device numbers assigned to the DVs 502a and 502b.
[0010]
First, a method of allocating the device number 109 necessary for accessing each DV from the PC 301 will be described.
[0011]
In the IEEE 1394 bus 103, each DV is assigned a unique value called a node ID. For example, it is assumed that 1 is assigned to the DV 502a and 2 is assigned to the DV 502b. When the number of devices connected to the IEEE 1394 bus 103 fluctuates, or when a certain device explicitly generates a bus reset, the node ID is reassigned. However, the node ID is not necessarily changed to the same value as the previously assigned node ID. Not necessarily.
[0012]
When the PC 301 is powered on or newly connected to the IEEE 1394 bus 103, the PC 301 assigns the device number 109 to each DV in order to access each DV. As an assignment method, for example, if the node IDs are assigned as 0, 1, 2,... From the smallest DV at that point, 0 is assigned to the DV 502a and 1 is assigned to the DV 502b. At this time, the node ID and device number 109 of each DV are as shown in the column (before restart) in FIG.
[0013]
Here, when the PC 301 is restarted, the device numbers 109 are reassigned to all the DVs. At this point, as shown in FIG. 10, if the node ID of the DV 502a is 2 and the node ID of the DV 502b is 1, then the DV 502a has the device ID of 1 and the DV 502b has the device ID of 1. 0 is assigned.
[0014]
Next, a method of controlling the operation of the DV 502a and the DV 502b from the PC 301 will be described.
[0015]
For example, when the device number of the DV 502a is 0, when an operation in the DV 502a is to be instructed, a command 108 and a device number 109 corresponding to the DV 502a are input to the IEEE1394 interface 104. The IEEE 1394 interface 104 transmits the command 108 as a command 108 a to the DV 502 a corresponding to the received device number 109 via the IEEE 1394 bus 103. The IEEE 1394 interface 504a receives the command 108a sent to the DV 502a via the IEEE 1394 bus 103, and outputs the command 108a to the control circuit 107a. The control circuit 107a determines the contents of the command 108a and instructs the operation of the recording / reproducing circuit 503a.
[0016]
Next, a method of transmitting data from the PC 301 to the DV 502a will be described.
[0017]
For example, when the device number of the DV 502a is set to 0 and the data 505 is transmitted to the DV 502a, the device number 109 corresponding to the DV 502a and the data 505a are input to the IEEE1394 interface 104.
[0018]
In general, the IEEE 1394 bus 103 has a plurality of channels and can perform a plurality of data communications at the same time. Therefore, when performing data communication, it is necessary to specify a channel. For example, assume that the DV 502a uses the channel 63. At this time, the IEEE 1394 interface 104 transmits the data 505 to the channel 63 via the IEEE 1394 bus 103 in order to transmit the data 505 to the DV 502 a indicated by 0 which is the device number 109. The IEEE 1394 interface 504a receives the data 505 sent to the DV 502a via the IEEE 1394 bus 103, and outputs the data 505 to the recording / reproducing circuit 503a. The recording / reproducing circuit 503a reproduces and / or records the input data 505. When reproducing, the reproduced video 507a is output to the monitor 506a.
[0019]
At this time, if the DV 502b uses the channel 63, the DV 502b can also receive the data 505 at the same time.
[0020]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, when the user controls the operation of the DV from the PC, the DV for which the operation is to be controlled is specified using the device number assigned to each DV. However, the PC assigns a device number to each DV when the power is turned on. When a plurality of DVs are connected on the IEEE 1394 bus, the value of the device number assigned to a certain DV differs from the last time. Sometimes. For this reason, there is a problem that the DV cannot be identified because the user does not know to which DV a certain device number is assigned this time.
[0021]
The present invention has been made in view of such a conventional problem, and in a network in which a device number for specifying a device changes, it is easy to identify which device is to be controlled. It is possible Ruko Mpew Data And a program recording medium.
[0022]
[Means for Solving the Problems]
To solve the above-mentioned issues, 1 The present invention relates to a computer using a system including a computer connected to a network to which a node number is automatically assigned upon reset and a plurality of terminal devices connected to the network,
A second interface for receiving a command sent from the computer via the network;
Control means for controlling the command received by the second interface to be executed;
For a terminal device having a second memory that is referred to by the second interface and stores its own node unique ID sent to the computer,
When the network is reset,
A first interface for sending a command requesting a node unique ID to the terminal device to the network, and sending the command while replacing the node number with the command sequentially;
A first memory for storing a list in which a node unique ID and / or a name indicating the terminal device are added to a node number;
Conversion means for creating the list at the first time, storing the list in the first memory, and updating the list at the second and subsequent times;
When the first interface sends a command requesting a node unique ID to the network,
The second interface sends a node unique ID back to the first interface via the network according to the command,
The first interface receives the node unique ID sent from the second interface via the network,
The conversion means creates or updates the list using a node unique ID sent from each terminal device,
The computer is characterized in that a correspondence between each node and each terminal device is obtained from the list.
Also, 2 The present invention uses a device number instead of the node number. Item 1 Computer.
Also, 3 The present invention Is before The network is an IEEE 1394 bus. Item 1 Computer.
Also, 4 The invention of claim Item 1 A program recording medium characterized by storing a program for causing a computer to execute each function of the computer described above.
[0057]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment 1)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an example of a PC and a DV connected to an IEEE 1394 bus. In FIG. 1, reference numeral 101 denotes a PC that controls the DVs 102a and 102b via the IEEE 1394 bus 103. Reference numerals 102a and 102b denote DVs which are controlled by the PC 101 via the IEEE 1394 bus 103 and record and reproduce data. Reference numerals 105a and 105b denote IEEE 1394 interfaces for exchanging commands and data via the IEEE 1394 bus 103. 106a and 106b are recording / reproducing circuits for recording and reproducing data. 107a and 107b are control circuits that receive commands from the IEEE 1394 interfaces 105a and 105b and control the recording / reproducing circuits 106a and 106b according to the contents. Reference numeral 111 denotes an identification command for identifying a device corresponding to the device number.
[0058]
Next, the operation of the present embodiment will be described.
[0059]
FIG. 2 is an example of a device identification method.
[0060]
As described in the conventional example, when controlling the operation of the DV 102a, the value of the device number 109 assigned to the DV 102a and the command 108 indicating the operation are input to the IEEE 1394 interface 104.
[0061]
Now, for example, it is assumed that there are two device numbers 109, 0 and 1, which have already been assigned, and that each is assigned to either the DV 102a or the DV 102b. FIG. 2 is a flowchart illustrating a method of checking which DV is assigned with 0 as the device number 109.
[0062]
In FIG. 2, the process is started from (Step 200), and 0, which is the device number 109 to be identified in (Step 201), and the device identification command 111 are input.
[0063]
In (Step 202), the input circuit 110 outputs 0 as the device number 109 and a reproduction command as the command 108 to the IEEE 1394 interface 104.
[0064]
In (step 203), it is confirmed whether or not the reproduction of the DV 102a has been started. If the reproduction of the DV 102a has started, the process proceeds to (Step 204), and if the reproduction has not started, the process proceeds to (Step 205).
[0065]
In (Step 204), it is determined that the DV to which 0 is assigned as the device number 109 is the DV 102a, and the process proceeds to (Step 208).
[0066]
In (Step 205), it is confirmed whether or not the reproduction of the DV 102b has been started. If the reproduction of the DV 102b has started, the process proceeds to (Step 206), and if the reproduction has not started, the process proceeds to (Step 207). In (Step 206), it is determined that the DV to which 0 is assigned as the device number 109 is the DV 102b, and the process proceeds to (Step 208).
[0067]
In (Step 207), it is determined that there is no DV to which 0 is assigned as the device number 109, and the process proceeds to (Step 208).
[0068]
Finally (Step 208) ends.
[0069]
As described above, in the present embodiment, the device number 109 and the identification command 110 are input, and by checking which DV is to be reproduced, the value of the device number 109 and the DV to which the value is assigned are determined. Can identify either.
[0070]
In the present embodiment, the reproduction command is transmitted as the command 108, but any command for instructing the operation of the DV may be used as long as the command indicates that the DV has operated.
[0071]
Although two DVs and one PC are connected on the IEEE 1394 bus, it is sufficient that at least one DV and PC are connected.
[0072]
In addition, although the transmission / reception device is a DV, any transmission / reception device may be used as long as the operation can be controlled by an IEEE1394 interface.
[0073]
Although the bus is an IEEE 1394 bus and the interface is an IEEE 1394 interface, any device may be assigned as long as a device number is assigned to control the operation of the transmitting / receiving device connected to the bus and the device number may change. A bus and an interface may be used.
[0074]
The device number 109 may be a number appropriately assigned by the PC 101, or the node ID may be used as it is.
[0075]
Further, the PC 101, the DV 102a, and the DV 102b may be configured only with hardware, or may be configured with both hardware and software.
[0076]
Note that the DV of the present embodiment is an example of the terminal device of the present invention, the PC of the present embodiment is an example of the computer of the present invention, and the transmitting / receiving device of the present embodiment is an example of the terminal device of the present invention. Yes, the IEEE 1394 interface 104 of the present embodiment is an example of the first interface of the present invention, the IEEE 1394 interface 105a and the IEEE 1394 interface 105b are examples of the second interface of the present invention, and the input circuit 110 of the present embodiment is This is an example of the input means of the present invention, and the control circuit 107a and the control circuit 107b of the present embodiment are examples of the control means of the present invention.
[0077]
(Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
[0078]
FIG. 3 is an example of a PC and a DV connected to the IEEE 1394 bus. In FIG. 3, reference numerals 302a and 302b denote DVs controlled by the PC 301 via the IEEE 1394 bus 103. 303a and 303b are control circuits for controlling the recording / reproducing circuits 106a and 106b and the LEDs 304a and 304b in accordance with the contents of the command sent from the PC 301 via the IEEE 1394 bus 103. 304a and 304b are LEDs having a function of turning on and off. The difference between the configuration of the present embodiment and the first embodiment is that the DVs 302a and 302b have LEDs 304a and 304b, respectively.
[0079]
Next, the operation of the present embodiment will be described.
[0080]
As described in the conventional example, when controlling the operation of the DV 302a, the value of the device number 109 assigned to the DV 302a and the command 108 indicating the operation are input to the IEEE 1394 interface 104.
[0081]
Now, it is assumed that the value of the device number 109 indicating the DV 302a is 0, for example. Here, when the device number 109 is input to the IEEE 1394 interface 104 as 0, and a command 108 to turn on the LED is input, the command 108 is transmitted to the IEEE 1394 interface 105 a through the IEEE 1394 bus 103. The IEEE 1394 interface 105a outputs the received command 108 to the control circuit 303a, and the control circuit 303a turns on the LED 304a if the command 108 is a command to turn on the LED.
[0082]
As described above, if the appropriate device number 109 and the command to turn on the LED are input to the IEEE 1394 interface 103 as the command 108, the DV LED corresponding to the specified value of the device number 109 is turned on. At this time, even if it is not known which DV corresponds to the value of the device number 109, it is possible to identify the DV corresponding to the device number 109 by checking which DV has the LED turned on. .
[0083]
In the present embodiment, it is assumed that two DVs and one PC are connected on the IEEE 1394 bus, but it is sufficient that at least one DV and PC are connected.
[0084]
In addition, although the transmission / reception device is a DV, any transmission / reception device may be used as long as the operation can be controlled by an IEEE1394 interface.
[0085]
Although the bus is an IEEE 1394 bus and the interface is an IEEE 1394 interface, any device may be assigned as long as a device number is assigned to control the operation of the transmitting / receiving device connected to the bus and the device number may change. A bus and an interface may be used.
[0086]
The device number 109 may be a number appropriately assigned by the PC 101, or the node ID may be used as it is.
[0087]
Further, the PC 301, the DV 302a, and the DV 302b may be configured only with hardware, or may be configured with both hardware and software.
[0088]
The DV of the present embodiment is an example of the terminal device of the present invention, the PC of the present embodiment is an example of the computer of the present invention, and the transmitting / receiving device of the present embodiment is an example of the terminal device of the present invention. Yes, the IEEE 1394 interface 104 of the present embodiment is an example of the first interface of the present invention, and the IEEE 1394 interface 105a and the IEEE 1394 interface 105b of the present embodiment are examples of the second interface of the present invention. The LEDs 304a and 304b are examples of lighting means of the present invention, and the control circuits 303a and 303b of this embodiment are examples of control means of the present invention.
[0089]
(Embodiment 3)
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
[0090]
FIG. 4 is an example of a PC and a DV connected to the IEEE 1394 bus. In FIG. 4, reference numeral 401 denotes a PC that controls the DVs 402a and 402b via the IEEE 1394 bus 103. Reference numerals 402a and 402b denote DVs which are controlled by the PC 401 via the IEEE 1394 bus 103 and perform data recording and reproduction. A conversion circuit 403 updates the conversion information 409 recorded in the memory 404 every time the device number 109 assigned to the DV 402a or 402b is updated. A memory 404 stores a combination of a device name 408, a node unique ID 407, and a device number 109 assigned to the DV 402a or 402b. Reference numerals 405a and 405b denote IEEE 1394 interfaces for exchanging data and exchanging commands via the IEEE 1394 bus 103. ROMs 406a and 406b record node unique IDs of the DVs 402a and 402b, respectively. 407a and 407b are node unique IDs of the DVs 402a and 402b, respectively. A device name 408 uniquely identifies the DV 402a or 402b. Reference numeral 409 denotes conversion information that holds information on the combination of the device name 408, node unique ID 407, and device number 109 of each DV. The configuration of the present embodiment differs from the configuration of the first embodiment in that a conversion circuit is provided instead of the input circuit, a memory circuit is provided, and the DV has a ROM.
[0091]
Next, the operation of the present embodiment will be described.
[0092]
FIG. 11 is an example of the conversion information.
[0093]
As described in the conventional example, when the operation control of the DV 402a is performed, the value of the device number 109 assigned to the DV 402a and the command 108 indicating the operation are input to the IEEE 1394 interface 104.
[0094]
The DV 402a holds a node unique ID 407a in the ROM 406a, which is unique to the device and has only one device having the same value, in the ROM 406a. Similarly, the DV 402b holds a node unique ID 407b in the ROM 406b. The IEEE 1394 interface 405a extracts a node unique ID 407a from the ROM 406a by sending a command for providing a node unique ID as necessary, and transmits the node unique ID 407a to the PC 401 through the IEEE 1394 bus 103. The IEEE 1394 interface 104 outputs the received node unique ID 407a to the conversion circuit 403 as the node unique ID 407.
[0095]
Each DV has a device name 408 in advance. In the memory 404, a combination of the device name 408, node unique ID 407, and device number 109 of each DV is recorded as conversion information 409. The conversion circuit 403 updates the conversion information 409 recorded in the memory 404 every time the device number 109 assigned to each DV is updated.
[0096]
For example, it is assumed that the conversion information 409 is shown in the column before the restart in FIG.
[0097]
When controlling the operation of the DV 402 a, an appropriate command 108 and “FIRST” as the device name 408 are input to the conversion circuit 403. The conversion circuit 403 extracts the conversion information 409 from the memory 404, and inputs the device number 0 corresponding to “FIRST” as the device number 109 to the IEEE 1394 interface 104 together with the command 108. The IEEE 1394 interface 104 transmits the command 108 as the command 108a to the DV 402a corresponding to 0, which is the device number 109, as in the conventional example.
[0098]
The IEEE 1394 interface 405a outputs the received command 108a to the control circuit 107a, and the control circuit 107a instructs the operation of the recording / reproducing circuit 106a according to the content of the input command 108a.
[0099]
Now, it is assumed that when the PC 401 is restarted, the combination of the device number, the device name, and the node unique ID is shown in the column after the restart in FIG. At this time, the conversion information 404 recorded in the memory 404 is also updated to the contents shown in the column after the restart in FIG. Although the device number assigned to each DV varies, the combination of the device name and the node unique ID does not change. Therefore, the conversion circuit 403 correctly converts the input device name 408 into the device number 109 of the corresponding DV. it can.
[0100]
As described above, even when the device number is not always constant, the DV can be correctly identified by the device name or the node unique ID.
[0101]
In the present embodiment, it is assumed that two DVs and one PC are connected on the IEEE 1394 bus, but it is sufficient that at least one DV and PC are connected.
[0102]
In addition, although the transmission / reception device is a DV, any transmission / reception device may be used as long as the operation can be controlled by an IEEE1394 interface.
[0103]
Although the bus is an IEEE 1394 bus and the interface is an IEEE 1394 interface, any device may be assigned as long as a device number is assigned to control the operation of the transmitting / receiving device connected to the bus and the device number may change. A bus and an interface may be used.
[0104]
The device number 109 may be a number appropriately assigned by the PC 101, or the node ID may be used as it is.
[0105]
Further, the PC 401, the DV 402a, and the DV 402b may be configured only with hardware, or may be configured with both hardware and software.
[0106]
The DV of the present embodiment is an example of the terminal device of the present invention, the PC of the present embodiment is an example of the computer of the present invention, and the transmitting / receiving device of the present embodiment is an example of the terminal device of the present invention. Yes, the IEEE 1394 interface 104 of the present embodiment is an example of the first interface of the present invention, and the IEEE 1394 interface 405a and the IEEE 1394 interface 405b of the present embodiment are examples of the second interface of the present invention. Is an example of the first memory of the present invention, the ROM 406a and the ROM 406b of the present embodiment are examples of the second memory of the present invention, and the conversion circuit 403 of the present embodiment is a conversion circuit of the present invention. This is an example, and the control circuit 107a and the control circuit 107b of the present embodiment are examples of control means of the present invention. .
[0107]
(Embodiment 4)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS.
[0108]
FIG. 5 is an example of a PC and a DV connected to the IEEE 1394 bus. In FIG. 5, a PC 501 controls the DVs 502a and 502b via the IEEE 1394 bus 103. 508a and 508b are change instructions for changing the channel that the DV is currently receiving. The difference between the configuration of the present embodiment and the first embodiment is that the PC 301 does not have an input circuit, and the DVs 502a and 502b have monitors 506a and 506b, respectively.
[0109]
Next, the operation of the present embodiment will be described.
[0110]
FIG. 6 is an example of a method for transmitting an identification video.
[0111]
The method of controlling the operation of the DV 502a from the PC 501 and the method of transmitting the data 505 from the PC 501 to the DV 502a in the present embodiment are the same as in the conventional example.
[0112]
Further, the IEEE 1394 interface 104 can change the reception channel used by the DV 502 a by transmitting a change instruction 508 a for changing the reception channel used by the DV 502 a to the DV 502 a via the IEEE 1394 bus 103.
[0113]
If it is desired to identify which DV the value of a certain device number 109 represents, the appropriate video data is input to the IEEE1394 interface 104 as data 505 and the value to be known as the device number 109 is input. The IEEE 1394 interface 104 transmits data 505 to the DV 502a, assuming that the input device number 109 represents, for example, the DV 502a.
[0114]
The IEEE 1394 interface 504a inputs the received data 505 to a recording / reproducing circuit 503a, and the recording / reproducing circuit 503a reproduces the data 505 and displays a reproduced video 507a on a monitor 506a. At this time, by examining at which DV the transmitted data 505 has been reproduced, it is possible to identify which DV the value of the input device number 109 represents.
[0115]
By the way, as described in the conventional example, the IEEE 1394 bus 103 can simultaneously perform a plurality of communications using a plurality of channels. However, if the DV 502a and the DV 503a use the same channel as the receiving channel, the PC 501 intends to transmit the data 505 to the DV 502a, but the same data 505 is received by the DV 502b and is similarly reproduced by the recording / reproducing circuit 503b. . That is, the reproduced video 507b displayed on the monitor 506b is exactly the same as the reproduced video 507a, and the DV 502a and the DV 502b cannot be distinguished.
[0116]
Therefore, FIG. 6 shows an example of a method of transmitting data so as not to be simultaneously reproduced by a plurality of DVs when DVs are identified.
[0117]
In FIG. 6, the process starts from (Step 601), and in (Step 602), the IEEE 1394 interface 104 checks all the channels used by each device connected to the IEEE 1394 bus 103.
[0118]
In (step 603), it is checked whether or not another device is using the channel used by the DV 502a. If another device is using the process, the process proceeds to (Step 604); otherwise, the process proceeds to (Step 605).
[0119]
In (Step 604), the IEEE 1394 interface 104 transmits the change instruction 508a to the DV 502a, thereby changing the channel used for reception by the DV 502a to a channel not used by another device, and proceeds to (Step 605). .
[0120]
In (step 605), the IEEE 1394 interface 104 transmits the data 505 to the DV 502a through the IEEE 1394 bus 103 using the reception channel of the DV 502a.
[0121]
Finally (Step 606) ends.
[0122]
In this way, if the DV reception channel corresponding to the device number connected to the IEEE 1394 bus 103 is changed by designating the device number, different DV channels can be assigned to each DV connected to the IEEE 1394 bus 103. Can be.
[0123]
As described above, by transmitting certain data using the value of a certain device number and examining which DV transmits the data transmitted, even if the device number is not always constant, Can be identified.
[0124]
In the present embodiment, it is assumed that two DVs and one PC are connected on the IEEE 1394 bus, but it is sufficient that at least one DV and PC are connected.
[0125]
In addition, although the transmission / reception device is a DV, any transmission / reception device may be used as long as the operation can be controlled by an IEEE1394 interface.
[0126]
Although the data 505 is video data, the data 505 may be audio data or video / audio data, and the audio reproduced by the recording / reproducing circuit 503a may be reproduced by a speaker or the like.
[0127]
Although the bus is an IEEE 1394 bus and the interface is an IEEE 1394 interface, any device may be assigned as long as a device number is assigned to control the operation of the transmitting / receiving device connected to the bus and the device number may change. A bus and an interface may be used.
[0128]
The device number 109 may be a number appropriately assigned by the PC 101, or the node ID may be used as it is.
[0129]
Also, the PC 501, the DV 502a, and the DV 502b may be configured only with hardware, or may be configured with both hardware and software.
The DV of the present embodiment is an example of the terminal device of the present invention, the PC of the present embodiment is an example of the computer of the present invention, and the transmitting / receiving device of the present embodiment is an example of the terminal device of the present invention. is there.
[0130]
(Embodiment 5)
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.
[0131]
FIG. 7 is an example of a PC and a DV connected to the IEEE 1394 bus. 7, reference numerals 702a and 702b denote DVs controlled by the PC 301 via the IEEE1394 bus 103. Reference numerals 703a and 703b are identification information for uniquely identifying the DVs 702a and 702b. Reference numerals 704a and 704b denote IEEE 1394 interfaces for exchanging data and commands via the IEEE 1394 bus 103. 705a and 705b are input circuits for inputting identification information. Reference numerals 706a and 706b denote memories for recording the identification information input by the input circuits 705a and 705b. Reference numerals 707a and 707b denote control circuits for controlling the recording / reproducing devices 106a and 106b in accordance with the contents of the commands received by the IEEE 1394 interfaces 704a and 704b. The configuration of the present embodiment differs from the first embodiment in that the PC 301 does not have an input circuit, and that the DVs 702a and 702b have input circuits 705a and 705b and memories 706a and 706b, respectively. is there.
[0132]
Next, the operation of the present embodiment will be described.
[0133]
The method of controlling the operation of DV 702a from PC 301 in the present embodiment is the same as that of the conventional example.
[0134]
The identification information 703a input by the input circuit 705a is recorded in the memory 706a. Here, the identification information 703a is information for specifying the DV 702a, for example, an appropriate numerical value unique to the DV 702. This identification information is, for example, a SCSI device that can change the SCSI ID with a Dip switch, and is a numerical value such as the SCSI ID.
[0135]
When the control circuit 707a receives the command for acquiring the identification information 703 as the command 108, it extracts the identification information 703a from the memory 706a and outputs it to the IEEE 1394 interface 704a. The IEEE 1394 interface 704a transmits the identification information 703a to the PC 301 through the IEEE 1394 bus 103.
[0136]
As described above, by transmitting a command for acquiring identification information for a certain device number value, the DV can be identified by acquiring the DV identification information represented by the device number value. .
[0137]
In the present embodiment, it is assumed that two DVs and one PC are connected on the IEEE 1394 bus, but it is sufficient that at least one DV and PC are connected.
[0138]
In addition, although the transmission / reception device is a DV, any transmission / reception device may be used as long as the operation can be controlled by an IEEE1394 interface.
[0139]
Although the bus is an IEEE 1394 bus and the interface is an IEEE 1394 interface, any device may be assigned as long as a device number is assigned to control the operation of the transmitting / receiving device connected to the bus and the device number may change. A bus and an interface may be used.
[0140]
The device number 109 may be a number appropriately assigned by the PC 101, or the node ID may be used as it is.
[0141]
Further, the PC 301, the DV 702a, and the DV 702b may be configured only with hardware, or may be configured with both hardware and software.
The DV of the present embodiment is an example of the terminal device of the present invention, the PC of the present embodiment is an example of the computer of the present invention, and the transmitting / receiving device of the present embodiment is an example of the terminal device of the present invention. Yes, the IEEE 1394 interface 104 of the present embodiment is an example of the first interface of the present invention, and the IEEE 1394 interface 704a and the IEEE 1394 interface 704b of the present embodiment are examples of the second interface of the present invention. The memory 706a and the memory 706b of the present invention are examples of the second memory of the present invention, the control circuit 707a and the control circuit 707b of the present invention are examples of the control means of the present invention, and the input circuit 705a and the input circuit of the present embodiment 705b is an example of the input means of the present invention.
[0142]
(Embodiment 6)
Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG.
[0143]
FIG. 8 is an example of a PC and a DV connected to the IEEE 1394 bus. 8, DVs 801a and 801b are DVs controlled by the PC 301 via the IEEE 1394 bus 103. 109a and 109b are values of the device number 109 assigned to the DV 801a and the DV 801b, respectively. Reference numerals 802a and 802b are control circuits that control the display circuits 803a and 803b, the memories 804a and 804b, and the recording / reproducing circuits 106a and 106b in accordance with the contents of the commands passed from the IEEE 1394 interfaces 102a and 102b. 803a and 803b are display circuits for displaying device numbers. 804a and 804b are memories for recording device numbers. The configuration of this embodiment differs from the first embodiment in that the PC 301 does not have an input circuit, and that the DVs 801a and 801b have display circuits 803a and 803b and memories 804a and 804b, respectively. .
[0144]
Next, the operation of the present embodiment will be described.
[0145]
The method of controlling the operation of the DV 801a from the PC 301 in the present embodiment is the same as in the conventional example.
[0146]
When receiving the command for recording the device number 109 as the command 108a, the control circuit 802a extracts the device number 109a, which is the value of the device number 109, from the received command 108a and records it in the memory 804a.
[0147]
Further, the control circuit 802a extracts the device number 109a recorded in the memory 804a as necessary, and causes the display circuit 803a to display the device number 109a.
[0148]
When the value of the device number 109 assigned to each DV is changed, the PC 301 records the new value of the device number 109 on each DV using a command for recording the device number 109. Thus, the device number 109a recorded in the memory 804a can always be the value of the device number 109 assigned to the DV 801a.
[0149]
As described above, by displaying the device number assigned to each DV on each DV, the DV represented by the value of a certain device number can be identified.
[0150]
In the present embodiment, it is assumed that two DVs and one PC are connected on the IEEE 1394 bus, but it is sufficient that at least one DV and PC are connected.
[0151]
In addition, although the transmission / reception device is a DV, any transmission / reception device may be used as long as the operation can be controlled by an IEEE1394 interface.
[0152]
Although the bus is an IEEE 1394 bus and the interface is an IEEE 1394 interface, any device may be assigned as long as a device number is assigned to control the operation of the transmitting / receiving device connected to the bus and the device number may change. A bus and an interface may be used.
[0153]
The device number 109 may be a number appropriately assigned by the PC 101, or the node ID may be used as it is.
[0154]
Further, the PC 301, the DV 801a, and the DV 801b may be configured only with hardware, or may be configured with both hardware and software.
[0155]
The DV of the present embodiment is an example of the terminal device of the present invention, the PC of the present embodiment is an example of the computer of the present invention, and the transmitting / receiving device of the present embodiment is an example of the terminal device of the present invention. The display circuit of the present embodiment is an example of the display means of the present invention, and the IEEE 1394 interface 104 of the present embodiment is an example of the first interface of the present invention, and the IEEE 1394 interface 102a and the IEEE 1394 interface of the present embodiment. The interface 102b is an example of a second interface of the present invention, and the control circuits 802a and 802b of the present embodiment are examples of control means of the present invention.
[0156]
The present invention is realized by a program that can be executed by a computer such as a PC, and is recorded on a recording medium such as a floppy disk, a CD (compact disk), or a magneto-optical disk, and is transferred. It can be easily executed even with a computer.
[0157]
A program recording medium storing a program for causing a computer to execute each function of the present invention also belongs to the present invention.
[0158]
【The invention's effect】
As described above, according to the present invention, it is possible to easily identify a device represented by a certain device number in a network in which device numbers representing devices change. Ruko Mpew Data And a program recording medium.
[0159]
Further, according to the present invention, by accessing a device by using a unique device name instead of a device number, even in a network in which a device number representing a device changes, the device can be easily accessed. Can be identified Ruko Mpew Data And a program recording medium.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a PC and a DV connected to an IEEE 1394 bus according to a first embodiment of the present invention.
FIG. 2 is a flowchart of a device identification method according to the first embodiment of the present invention.
FIG. 3 is a block diagram showing a configuration of a PC and a DV connected to an IEEE 1394 bus according to a second embodiment of the present invention.
FIG. 4 is a block diagram showing a configuration of a PC and a DV connected to an IEEE 1394 bus according to a third embodiment of the present invention.
FIG. 5 is a block diagram showing a configuration of a PC and a DV connected to an IEEE 1394 bus according to a fourth embodiment of the present invention.
FIG. 6 is a flowchart of a method for transmitting an identification image according to a fourth embodiment of the present invention.
FIG. 7 is a block diagram showing a configuration of a PC and a DV connected to an IEEE 1394 bus according to a fifth embodiment of the present invention.
FIG. 8 is a block diagram showing a configuration of a PC and a DV connected to an IEEE 1394 bus according to a sixth embodiment of the present invention.
FIG. 9 is a block diagram showing a configuration of a PC and a DV connected to an IEEE 1394 bus in a conventional example.
FIG. 10 is a list showing an example of node IDs of DV502a and DV502b and a device number assigned to each of them in a conventional example.
FIG. 11 is a list showing an example of node unique IDs and device names of DVs 402a and 402b and a device number assigned to each DV in the third embodiment of the present invention.
[Explanation of symbols]
101 PC
102a, 102b DV
103 IEEE 1394 bus
104 IEEE 1394 interface
105a, 105b IEEE 1394 interface
106a, 106b recording / reproducing circuit
107a, 107B control circuit
108, 108a, 108b command
109 Device number
301 PC
302a, 302b DV
303a, 303b control circuit
304a, 304b LED
401 PC
402a, 402b DV
403 conversion circuit
404 memory
405a, 405b IEEE 1394 interface
406a, 406b ROM
407a, 407b Node unique ID
408 Device name
409 Conversion information
502a, 502b DV
503a, 503b recording / reproducing circuit
504a, 504b IEEE 1394 interface
505, 505a, 505b data
506a, 506b monitor
507a, 507b Playback video
508a, 508b Change instruction
702a, 702b DV
703, 703a, 703b Identification information
704a, 704b IEEE 1394 interface
705a, 705b input circuit
706a, 706b memory
707a, 707b control circuit
801a, 801b DV
802a, 802b control circuit
803a, 803b Display circuit
804a, 804b memory

Claims (4)

In a computer using a system including a computer connected to a network to which a node number is automatically assigned upon reset and a plurality of terminal devices connected to the network,
A second interface for receiving a command sent from the computer via the network;
Control means for controlling the command received by the second interface to be executed;
For a terminal device having a second memory that is referred to by the second interface and stores its own node unique ID sent to the computer,
When the network is reset,
A first interface for sending a command requesting a node unique ID to the terminal device to the network, and sending the command while replacing the node number with the command sequentially;
A first memory for storing a list in which a node unique ID and / or a name indicating the terminal device are added to a node number;
Conversion means for creating the list at the first time, storing the list in the first memory, and updating the list at the second and subsequent times;
When the first interface sends a command requesting a node unique ID to the network,
The second interface sends a node unique ID back to the first interface via the network according to the command,
The first interface receives the node unique ID sent from the second interface via the network,
The conversion means creates or updates the list using a node unique ID sent from each terminal device,
A computer, wherein the correspondence between each node and each terminal device is obtained from the list. Claim 1 Symbol placement computer instead of the node number, characterized by using the device number. Claim 1 Symbol placement computer, wherein said network is a IEEE1394 bus. Program recording medium characterized by storing a program for executing each function according to claim 1 Symbol placement of the computer.

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