JP2001285962A - Home network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a home network system with excellent security that can prevent defects in advance such as illegal operations of each terminal by a camouflage device pretending to be a controller. SOLUTION: The controller 1 monitors electronic messages transmitted on the home network system. When there is any sender message having the same address as that of the controller 1 among the messages although the controller 1 is not a sender, the controller 1 discriminates that there is an illegal access by the camouflage device pretending to be the controller 1 and transmits a remote control acceptance inhibit instruction to each terminal. On the other hand, when receiving the remote control acceptance inhibit instruction, each air-conditioner terminal sets a mode disregarding the instruction from the controller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home network system including a plurality of terminals and a controller for controlling the terminals.

[0002]

2. Description of the Related Art A home network system has been developed and put into practical use, in which a plurality of home appliances in a home are used as terminals and these terminals are collectively managed by a controller.

[0003] In this home network system, information is transmitted between the controller and each terminal, for example, each terminal changes the control state in accordance with a command issued from the controller, or the state of each terminal is notified to the controller. Will be As the information transmission medium, wireless or power lines are often used.

[0004]

However, there is a problem that the level of security is low in a situation where a radio or a power line is used as an information transmission medium.

[0005] For example, there is a case where an external device impersonates a controller and illegally operates each terminal.

[0006] The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a highly secure home network system that can prevent a problem such as a fake device impersonating a controller from operating each terminal illegally.

[0007]

According to a first aspect of the present invention, there is provided a home network system which monitors messages transmitted on the system and includes, in each message, an address of the controller when the controller is not a transmission source. If there is a message having the same address as the transmission source, the controller transmits a remote control acceptance prohibition command to each terminal based on the determination that there is an unauthorized access by a device impersonating the controller. Each terminal sets a mode for ignoring a command from the controller when receiving the remote control reception prohibition command.

A home network system according to a second aspect of the present invention monitors a message transmitted on the system, and includes, in each message, the same address as the address of the controller when the controller is not the sender. If there is a message having the above, the remote control prohibition reception command is transmitted to each terminal together with the reception prohibition code, based on the determination that the unauthorized access by the device impersonating the controller exists. In each terminal, when receiving the remote control reception prohibition command, only when the reception prohibition code is attached to the remote control reception prohibition command and the reception prohibition code matches the pre-registered reception prohibition code, Set the mode to ignore the instruction from the controller.

[0009] The home network system according to the third aspect of the present invention, in the second aspect, limits that the acceptance prohibition code can be changed.

In the home network system according to a fourth aspect of the present invention, in the first or second aspect of the invention, the type of the remote control acceptance prohibition command transmitted from the controller can be selected.

According to a fifth aspect of the present invention, in the home network system according to the first or second aspect, the controller is provided with third control means, and each terminal is provided with fourth control means. The third control means transmits a release command for releasing the remote control acceptance prohibition command to each terminal. The fourth control means, upon receiving the cancellation command,
Release the mode to ignore the instruction from the controller.

According to a sixth aspect of the present invention, in the home network system according to the first or second aspect, the controller is provided with third control means, and each terminal is provided with fourth control means. The third control means transmits a release command for releasing the remote control reception prohibition command to each of the terminals together with a release code. The fourth control means, upon receiving the release command, ignores the command from the controller only when a release code is attached to the release command and the release code matches a previously registered release code. Cancel the mode.

According to a seventh aspect of the present invention, in the home network system according to the sixth aspect, the release code is limited to the same code as the reception prohibition code.

According to an eighth aspect of the present invention, in the home network system according to the sixth aspect, it is limited that the release code can be changed.

According to a ninth aspect of the present invention, in the home network system according to any one of the first to eighth aspects, the monitoring means is provided via an information transmission medium different from the information transmission medium on the system. It is limited to being connected to the controller.

[0016]

[1] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a controller having a transmitting / receiving antenna 2. Numerals 3 denote air conditioner terminals (hereinafter referred to as air conditioner terminals) each having a transmitting / receiving antenna 4. A home network system using a wireless communication line as an information transmission medium is constructed by the controller 1 and each air conditioner terminal 3.

As shown in FIG. 2, the controller 1 includes a transmitting / receiving unit 11 and a memory 1
2. The display unit 13, the setting operation unit 14, and the dedicated line connection terminal 15 are connected, and "0x01" is set as an address on the network.

The CPU 10 has the following means (1) to (4) as main functions.

(1) Monitoring means for monitoring a message transmitted on the home network system.

(2) It is determined whether or not each message monitored by the monitoring means includes a message having the same address as the address of the controller 1 even though the controller 1 is not the sender. Determination means to perform.

(3) Control means for transmitting a remote control acceptance prohibition command to each air conditioner terminal 3 when the judgment by the judgment means is affirmative.

(4) Control means for transmitting a release command for releasing the remote control acceptance prohibition command to each terminal.

The transmission / reception unit 11 transmits / receives information to / from each air conditioner terminal 3 via the transmission / reception antenna 2. The memory 12 stores a control program for the controller 1, command information to be sent to each air conditioner terminal 3, and the like. The display unit 13 displays command information for each air conditioner terminal 3, information received from each air conditioner terminal 3, and the like. The setting operation section 14 is for setting operating conditions for each air conditioner terminal 3.

As shown in FIG. 3, each air conditioner terminal 3
The transmission and reception unit 21 and the memory 2
2, display unit 23, setting operation unit 24, dedicated line connection terminal 2
5, a sensor 26, and a driving device 27 are connected, and "0x02""0"
x03 "and" 0x04 "are set.

The CPU 20 has the following means (5) and (6) as main functions.

(5) Control means for setting a mode in which a command from the controller 1 is ignored when a remote control acceptance prohibition command is received from the controller 1.

(6) When receiving the cancel command, cancel the mode in which the command from the controller 1 is ignored.

The transmitting / receiving section 21 transmits / receives information to / from the controller 1 via the transmitting / receiving antenna 4. The memory 22 stores a control program for the air conditioner terminal 3 and the like. The display unit 23 displays the operation mode of the air conditioner terminal 3 and the like. The setting operation section 24 is for setting operating conditions for the air conditioner terminal 3. Sensor 2
6 is, for example, an indoor temperature sensor. Drive device 27
Drives a compressor, an outdoor blower, an indoor blower, and the like.

FIG. 4 shows an example of a message transmitted in such a home network system. This is an example of a message transmitted from the controller 1 to each of the air conditioner terminals 3. First, there is a header, then source address data “0x01” and destination address data “0x03”, and finally data representing the content of transmission.

Next, the operation of the above configuration will be described with reference to FIGS. 5 is a flowchart for explaining the control of the controller 1, FIG. 6 is an example of a telegram,
FIG. 7 is a flowchart for explaining control of each air conditioner terminal 3, and FIG. 8 is an example of unauthorized access.

When a device impersonating the controller 1 accesses the air conditioner terminal 3 having the address “0x03”, for example, an unauthorized access, a message similar to the message shown in FIG. 4 flows on the network.

As examples of impersonating the controller 1, various cases can be considered, such as a case where an external device impersonates and a case where any one of the air conditioner terminals 3 impersonates. This is shown in FIG. 8 as a fake terminal. That is, the camouflage terminal 5 has the transmission / reception antenna 6 and illegally has the same address “0x01” as the controller 1.

The controller 1 constantly monitors messages transmitted on the home network system (step 101). It is determined whether or not each of the monitored messages includes a message having the same address as the address “0x01” of the controller 1 as the transmission source when the controller 1 is not the transmission source (step 102).

If this determination is affirmative (YES in step 102), the controller 1 sends each air conditioner terminal 3 to each air conditioner terminal 3 as shown in FIG. 6 based on the determination that an unauthorized access by an unauthorized device impersonating the controller 1 exists. A telegram including a remote control acceptance prohibition command is broadcast simultaneously (step 103). The destination address data “0x00” is added to this message.

At the same time as the simultaneous broadcast, information indicating that an unauthorized access has been made is displayed on the display unit 13 of the controller 1 (step 104).

In each air conditioner terminal 3, the received message is monitored (step 201), and if there is a remote control acceptance prohibition command in the received message (YES in step 202), a mode for ignoring the command from the controller 1 is set. Then, the reception process is interrupted (step 203). Since then
The message having the source address data “0x01” is ignored.

Therefore, even if an unauthorized access is made from the disguised terminal 5, it is possible to prevent such a problem that the disguised terminal 5 operates each air-conditioning terminal 3 illegally, thereby ensuring safety and reliability. Can be improved.

Thereafter, the setting operation section 1 of the controller 11
4 is released (YE in step 105).
S), a message (for example, shown in FIG. 12) including a release instruction is broadcast from the controller 1 to each air conditioner terminal 3 (step 106). The destination address data “0x00” is added to this message.

Simultaneously with the simultaneous broadcast, the display of the information to notify the presence of the unauthorized access on the display unit 13 is canceled (step 107).

When each air conditioner terminal 3 receives the release command (YES in step 204), the mode for ignoring the command from the controller 1 is released, and the reception process is restarted (step 205). Thereafter, a message having the source address data “0x01” becomes valid.

[2] A second embodiment will be described.

When the code of the remote control acceptance prohibition command is known to the camouflage terminal 5, it is possible to illegally issue the remote control acceptance prohibition command to prevent the operation of the network. In order to prevent such a situation, a network-specific acceptance prohibition code added to the remote control acceptance prohibition command is given to the controller 1 and all the air conditioner terminals 3 properly belonging to the network.

That is, when an arbitrary device such as an air conditioner is recognized as one of the terminals belonging to the home network system, the target device is connected to the dedicated line connection terminal 15 of the controller 1 via a dedicated line. The reception prohibition code registered in advance in the memory 12 is transmitted to the target device and registered in the memory 22 of the target device.

The CPU 10 has the following main functions (1).
1) to (14) are provided.

(11) Monitoring means for monitoring a message transmitted on the home network system.

(12) It is determined whether or not each message monitored by the monitoring means includes a message having the same address as the address of the controller 1 even though the controller 1 is not the sender. Determination means to perform.

(13) Control means for transmitting a remote control acceptance prohibition instruction to each air conditioner terminal 3 together with an acceptance prohibition code to each air conditioner terminal 3 when the judgment of this judgment means is affirmative.

(14) Control means for transmitting a release command for releasing the remote control acceptance prohibition command to each terminal.

The CPU 20 has the following main functions (1).
5) It has the means of (16).

(15) When a remote control acceptance prohibition command is received from the controller 1, an acceptance prohibition code is added to the remote control acceptance prohibition command, and the acceptance prohibition code is registered in the memory 22 in advance. Control means for setting a mode for ignoring a command from the controller 1 only when it matches the reception prohibition code.

(16) When the cancel command is received, the mode in which the command from the controller 1 is ignored is canceled.

The other configuration is the same as that of the first embodiment, and the description is omitted.

Next, the operation of the above configuration will be described with reference to FIGS. FIG. 9 is a flowchart for explaining the control of the controller 1, FIG. 10 is an example of a message, and FIG. 11 is a flowchart for explaining the control of each air conditioner terminal 3.

The controller 1 always monitors a message transmitted on the home network system (step 101). It is determined whether or not each of the monitored messages includes a message having the same address as the address “0x01” of the controller 1 as the transmission source when the controller 1 is not the transmission source (step 102).

If this determination is affirmative (YES in step 102), the controller 1 sends each air conditioner terminal 3 to the respective air conditioner terminals 3 as shown in FIG. 10 based on the determination that an unauthorized access by an unauthorized device impersonating the controller 1 exists. An electronic message including a remote control reception prohibition command and a reception prohibition code is broadcast simultaneously (step 103a). In this message,
Destination address data “0x00” is added.

At the same time as the simultaneous broadcast, information indicating that an unauthorized access has been made is displayed on the display unit 13 of the controller 1 (step 104).

At each air conditioner terminal 3, the received message is monitored as shown in FIG. 11 (step 201). If there is a remote control acceptance prohibition command in the received message (YES in step 202), the remote control acceptance is prohibited. The reception prohibition code, which should be attached to the command, is compared with a pre-registered reception prohibition code (step 206). Only when the reception prohibition code is attached and the reception prohibition code matches the pre-registered reception prohibition code (YES in step 207), a mode in which the instruction from the controller 1 is ignored is set. The receiving process is interrupted (step 203). Thereafter, the source address data “0”
The message having x01 "is ignored.

Therefore, even if an improper access is made from the impersonation terminal 5, it is possible to prevent a problem such as the impersonation terminal 5 operating each air conditioner terminal 3 improperly. In addition, by adding the reception prohibition code, it is possible to prevent the improper setting of the remote control reception prohibition by the spoofing terminal 5, thereby further improving the safety and reliability.

The reason that the reception prohibition code is different from the so-called house code is that a normal message does not include the reception prohibition code and is added only to a message including a remote control reception prohibition command. As a result, the possibility of the reception prohibition code leaking to the outside is reduced.

Thereafter, the setting operation section 1 of the controller 11
4 is released (YE in step 105).
S), a message including a release command is broadcast from the controller 1 to each air conditioner terminal 3 as shown in FIG. 12 (step 106). This message is accompanied by destination address data “0x00” and dummy instruction data that is not operation information.

Simultaneously with the simultaneous broadcast, the display of the information to notify the presence of the unauthorized access on the display unit 13 is canceled (step 107).

When each air conditioner terminal 3 receives the release command (YES in step 204), the mode in which the command from the controller 1 is ignored is released, and the receiving process is restarted (step 205). Thereafter, a message having the source address data “0x01” becomes valid.

The reception prohibition code (reception prohibition code registered in the memory 12) transmitted from the controller 1 is operated by operating a dip switch prepared in the setting operation section 14 of the controller 1.
Can be changed. Memory 22 of each air conditioner terminal 3
Can be changed by operating a dip switch prepared in the setting operation unit 24 of each air conditioner terminal 3.

Once a message to which the reception prohibition code is added is transmitted, it is conceivable that the reception prohibition code is stolen and the remote control reception prohibition process is executed illegally. Therefore, it is best to change the reception prohibition code as described above, once the message to which the reception prohibition code is added is transmitted before transmitting the release instruction. Whether the message to which the reception prohibition code is added is once transmitted is determined by the display units 13 and 2.
3 can be determined.

For the remote control acceptance prohibition command,
It is possible to select the type. This selection process is performed in a state where the target device is connected to the dedicated line connection terminal 15 of the controller 1 via a dedicated line when an arbitrary device such as an air conditioner is recognized as one of the terminals belonging to the home network system. be able to. By performing this selection process, each air conditioner terminal 3 is prohibited from accepting only a specific type of remote control, and is allowed to accept other types of remote control.

[3] A third embodiment will be described.

When the code of the release command is known to the camouflage terminal 5, the release command can be issued illegally to release the acceptance prohibition. In order to prevent such a situation, a network-specific release code to be added to the release command is given to the controller 1 and all the air conditioner terminals 3 properly belonging to the network.

That is, when an arbitrary device such as an air conditioner is recognized as one of the terminals belonging to the home network system, the target device is connected to the dedicated line connection terminal 15 of the controller 1 via the dedicated line, and the controller 1 The release code registered in advance in the memory 12 is transmitted to the target device and registered in the memory 22 of the target device.

The CPU 10 has the following main functions (2)
1) to (24) are provided.

(21) Monitoring means for monitoring messages transmitted on the home network system.

(22) It is determined whether or not there is a message having the same address as the address of the controller 1 as a source when the controller 1 is not the source among the messages monitored by the monitoring means. Judgment means.

(23) Control means for transmitting a remote control acceptance prohibition instruction to each air conditioner terminal 3 together with an acceptance prohibition code to each air conditioner terminal 3 when the judgment of this judgment means is affirmative.

(24) Control means for transmitting a release command for releasing the remote control acceptance prohibition command to each terminal together with a release code.

The CPU 20 has the following main functions (2).
5) It has the means of (26).

(25) When a remote control acceptance prohibition command is received from the controller 1, an acceptance prohibition code is added to the remote control acceptance prohibition command, and the acceptance prohibition code is registered in the memory 22 in advance. Control means for setting a mode for ignoring a command from the controller 1 only when it matches the reception prohibition code.

(26) When a release command is received, a command from the controller 1 is ignored only when a release code is added to the release command and the release code matches a previously registered release code. Cancel the mode.

The other structure is the same as that of the first embodiment, and the description is omitted.

Next, the operation of the above configuration will be described with reference to FIGS. 13 is a flowchart for explaining the control of the controller 1, FIG. 14 is an example of a message, and FIG. 15 is a flowchart for explaining the control of each air conditioner terminal 3.

The controller 1 always monitors messages transmitted on the home network system (step 101). It is determined whether or not each of the monitored messages includes a message having the same address as the address “0x01” of the controller 1 as the transmission source when the controller 1 is not the transmission source (step 102).

If this determination is affirmative (YES in step 102), the controller 1 sends each air conditioner terminal 3 to each air conditioner terminal 3 as shown in FIG. 10 based on the determination that an unauthorized access by an unauthorized device impersonating the controller 1 exists. An electronic message including a remote control reception prohibition command and a reception prohibition code is broadcast simultaneously (step 103a). In this message,
Destination address data “0x00” is added.

At the same time as the simultaneous broadcast, information indicating that an unauthorized access has been made is displayed on the display unit 13 of the controller 1 (step 104).

Each air conditioner terminal 3 monitors the received message (step 201), and if there is a remote control acceptance prohibition command in the received message (YES in step 202), the command is attached to the remote control acceptance prohibition command. The expected reception prohibition code is compared with the reception prohibition code registered in advance in the memory 22 of the air conditioner terminal 3 (step 206). Only when the reception prohibition code is attached and the reception prohibition code matches the pre-registered reception prohibition code (YES in step 207), a mode for ignoring the command from the controller 1 is set. As a result, the reception process is interrupted (step 203). Thereafter, the message having the source address data “0x01” is ignored.

Therefore, even if an unauthorized access is made from the camouflaged terminal 5, it is possible to prevent such a problem that the camouflaged terminal 5 operates each air conditioner terminal 3 illegally. In addition, by adding the reception prohibition code, it is possible to prevent the improper setting of the remote control reception prohibition by the spoofing terminal 5, thereby further improving the safety and reliability.

The reason that the reception prohibition code is different from the so-called house code is that the normal message does not include the reception prohibition code,
This is added only to a message including a remote control acceptance prohibition instruction. As a result, the possibility of the reception prohibition code leaking to the outside is reduced.

Thereafter, the setting operation section 1 of the controller 11
4 is released (YE in step 105).
S), the controller 1 sends the source address data “0x” as a release command to each air conditioner terminal 3 as shown in FIG.
A message including FF "is broadcast simultaneously (step 106).
a). This message is accompanied by destination address data “0x00” and a release code.

At the same time as the simultaneous broadcast, the display of the information indicating the presence of the unauthorized access on the display unit 13 is canceled (step 107).

When each air conditioner terminal 3 receives the release instruction (YES in step 204), the release code supposed to be attached to the release instruction and the release code registered in the memory 22 of the air conditioner terminal 3 in advance Are compared with each other (step 205). Only when the release code is attached and the release code matches the release code registered in advance (YES in step 208), the mode of ignoring the instruction from the controller 1 is released, and the reception processing is thereby completed. It is restarted (step 209). Since then
The message having the source address data “0x01” becomes valid.

The cancellation code is different from a so-called house code in that a normal message does not include a cancellation code and is added only to a message including a cancellation command. This allows
The possibility that the release code is leaked to the outside is reduced.

By adding such a release code, it is possible to prevent an unauthorized release of the prohibition of remote control reception by the spoofing terminal 5, and further improve the safety and reliability.

The release code transmitted from the controller 1 and the release code registered in each air conditioner terminal 3 are the reception inhibition code transmitted from the controller 1 and the reception inhibition code registered in each air conditioner terminal 3. May be the same code as That is, when an arbitrary device such as an air conditioner is recognized as one of the terminals belonging to the home network system, a common code is used as a reception prohibition code and a release code in the memory 12.
22 can be registered. This simplifies the code registration operation, and saves the memories 12 and 2.
2 can reduce the storage capacity.

Regarding the acceptance prohibition code and the cancellation code transmitted from the controller 1 (the acceptance prohibition code and the cancellation code registered in the memory 12), the DIP switch prepared in the setting operation section 14 of the controller 1 is used. It can be changed by operating. The reception prohibition code and the release code registered in the memory 22 of each air conditioner terminal 3 can also be changed by operating a dip switch prepared in the setting operation unit 24 of each air conditioner terminal 3.

Once a message to which a reception prohibition code or a release code is added is transmitted, it is conceivable that the reception prohibition code or the release code is stolen, and the remote control reception prohibition process is executed or released illegally. Can be
Therefore, once the message to which the acceptance prohibition code or the cancellation code is added is transmitted, before sending the cancellation command,
It is best to change the acceptance prohibition code or the cancellation code as described above. Whether the message to which the reception prohibition code or the cancellation code is added once has been transmitted can be determined from the display on the display units 13 and 23.

[4] A fourth embodiment will be described.

As shown in FIG. 16, the controller 1
Monitoring terminals 8 are connected to each other via an information transmission medium different from the information transmission medium on the home network system, for example, a plurality of dedicated lines (for example, power lines) 7.

Each monitoring terminal 8 has a transmitting / receiving antenna 9 and a function of directly monitoring a message transmitted from the controller 1 via the cable 7.
Anything such as general home appliances may be used.

The other configuration is the same as that of the first to third embodiments, and the description is omitted.

In this case, as shown in the flowchart of FIG. 17, when the controller 1 issues a remote control acceptance prohibition command or a cancellation command (YES in step 211), it sends an issue signal to the monitoring terminal 8 (step 212). .

Each monitoring terminal 8 constantly monitors a message on the home network system via the transmission / reception antenna 9, and despite not receiving an issue signal from the controller 1 (NO in step 301), When a message having the address “0x01” is received (step 302), the controller 1 issues a remote control acceptance prohibition command to each air conditioner terminal 3 based on the determination that an unauthorized access by a device impersonating the controller 1 exists. (Step 30)
3).

Therefore, even if there is an unauthorized access from the camouflaged terminal 5, it is possible to prevent such a problem that the camouflaged terminal 5 operates each air conditioner terminal 3 illegally, and to improve safety and reliability. Can be improved.

[5] In the above embodiments, the air conditioner terminal has been described as an example. However, the present invention can be similarly applied to a case where another home appliance is used as the terminal. In addition, the present invention is not limited to the above-described nuclear embodiment, and various modifications can be made without departing from the scope of the invention.

[0102]

As described above, according to the present invention, telegrams transmitted on the system are monitored, and the same address as that of the controller is included in each telegram even though the controller is not the transmission source. If there is a message as a transmission source, the controller sends a remote control acceptance prohibition command to each terminal based on the judgment that there is an unauthorized access by the device impersonating the controller. A mode is set to ignore a command from the controller when a reception prohibition command is received.This prevents problems such as unauthorized operation of each terminal by devices impersonating the controller. It is possible to provide a home network system with excellent security.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of first, second, and third embodiments.

FIG. 2 is a block diagram showing a configuration of a controller in each embodiment.

FIG. 3 is a block diagram showing a configuration of each air conditioner terminal in each embodiment.

FIG. 4 is a view showing a message format in each embodiment.

FIG. 5 is a flowchart for explaining control of a controller according to the first embodiment.

FIG. 6 is a diagram showing a format of a message including a remote control acceptance prohibition instruction according to the first embodiment.

FIG. 7 is a flowchart for explaining control of each air conditioner terminal according to the first embodiment.

FIG. 8 is a diagram illustrating an example of unauthorized access by a fake terminal in each embodiment.

FIG. 9 is a flowchart illustrating control of a controller according to the second embodiment.

FIG. 10 is a diagram showing a format of a message including a remote control reception prohibition instruction and a reception prohibition code according to the second embodiment.

FIG. 11 is a flowchart for explaining control of each air conditioner terminal in the second embodiment.

FIG. 12 is a diagram showing a format of a message including a release command in each embodiment.

FIG. 13 is a flowchart illustrating control of a controller according to the third embodiment.

FIG. 14 is an exemplary view showing a format of a message including a remote control reception prohibition instruction and a reception prohibition code according to the third embodiment.

FIG. 15 is a flowchart for explaining control of each air conditioner terminal in the third embodiment.

FIG. 16 is a block diagram showing the overall configuration of the fourth embodiment.

FIG. 17 is a flowchart illustrating a part of control by a controller according to the fourth embodiment;

FIG. 18 is a flowchart for explaining control of each monitoring terminal according to the fourth embodiment.

[Explanation of symbols]

1 ... controller, 3 ... air conditioner terminal, 5 ... fake terminal,
8 monitoring terminal, 10 CPU, 11 transmitting / receiving unit, 12 ...
Memory, 13 display unit, 14 setting operation unit, 15 dedicated line connection terminal, 20 CPU, 21 transmission / reception unit, 22 memory, 23 display unit, 24 setting operation unit, 25 dedicated line connection terminal , 26 ... Sensor, 27 ... Driver

 ──────────────────────────────────────────────────続 き Continued on front page F-term (reference) 5B049 AA05 CC48 EE51 GG03 5B089 GA01 GA21 GB02 HA11 JA35 JB16 JB22 KA17 KB06 KB13 KC47 5K033 BA01 BA08 DA01 DA17 EA06 5K048 AA15 BA12 DA02 DC01 EA14 EA16 EB01 EB01 HA02

Claims (9)

[Claims] 1. A home network system comprising a plurality of terminals and a controller for controlling these terminals, a monitoring means for monitoring messages transmitted on the system, and a monitoring means for monitoring messages transmitted by the monitoring means. Determining means for determining whether or not there is a message having the same address as the address of the controller as a source when the controller is not the transmission source; provided in the controller, wherein the determination by the determination means is affirmative. First control means for transmitting a remote control acceptance prohibition command to each of the terminals, and setting a mode for ignoring the command from the controller when the remote control acceptance prohibition command is received, provided in each of the terminals. A home network system, comprising: a second control unit. 2. A home network system comprising a plurality of terminals and a controller for controlling these terminals, a monitoring means for monitoring messages transmitted on the system, and a monitoring means for monitoring the messages transmitted by the monitoring means. Determining means for determining whether or not there is a message having the same address as the address of the controller as a source when the controller is not the transmission source; provided in the controller, wherein the determination by the determination means is affirmative. A first control means for transmitting a remote control prohibition reception command together with a system specific reception prohibition code to each of the terminals; and receiving the remote control prohibition command when the remote control reception prohibition command is received. The prohibition command is accompanied by a prohibition code, and the prohibition code is a pre-registered prohibition code. If matches only, first sets the mode to ignore commands from the controller 2
A home network system, comprising: a control unit; 3. The home network system according to claim 2, wherein the reception prohibition code transmitted from the controller and the reception prohibition code registered in each of the terminals are changeable. system. 4. The home network system according to claim 1, wherein the type of the remote control acceptance prohibition command transmitted from the controller is selectable. 5. The home network system according to claim 1, wherein a third control provided to the controller and transmitting a release command for releasing the remote control acceptance prohibition command to each of the terminals. Means, provided in each of the terminals, upon receiving the release command,
A fourth control unit for canceling a mode in which the command from the controller is ignored. 6. The home network system according to claim 1, wherein a release command for releasing the remote control reception prohibition command is transmitted to each of the terminals together with a release code, the release command being provided in the controller. 3 control means, provided in each of the terminals, upon receiving the release command,
A fourth control unit configured to release a mode of ignoring an instruction from the controller only when a release code is added to the release instruction and the release code matches a release code registered in advance. A home network system characterized by: 7. The home network system according to claim 6, wherein the release code transmitted from the controller and the release code registered in each terminal are an acceptance prohibition code transmitted from the controller and each terminal. A home network system, which is the same as the reception prohibition code registered in the home network. 8. The home network system according to claim 6, wherein a release code transmitted from the controller and a release code registered in each terminal are changeable. 9. The home network system according to claim 1, wherein the monitoring unit is connected to the controller via an information transmission medium different from an information transmission medium on the system. A home network system.