JP4858524B2 - Remote control monitoring system - Google Patents

Description

  The present invention relates to a remote control monitoring system that controls and monitors a device installed in a house or the like using a network terminal connected to the Internet.

2. Description of the Related Art Conventionally, a remote monitoring system that provides monitoring information to a network terminal through a gateway device has been provided in order to monitor an electrical device provided in a home with a network terminal such as a personal computer on the Internet. (Patent Document 1)
By the way, in such a system, information exchange between the network terminal and the gateway is often performed via the center server. In such a system, for example, the center server and the gateway using HTTP (Hyper Text Transfer Protocol) is used. A communication method in which commands are communicated bidirectionally is usually adopted.

  For example, as shown in FIG. 17, the conventional system employing this communication method includes an HTTP server unit 100 mounted on the gateway 1 and a personal computer or mobile phone (browser phone) mounted with a Web browser on the center server 2. The HTTP server unit 200 for supporting the network terminal 3 and the HTTP client unit 201 corresponding to the HTTP server unit 100 on the gateway 1 side are mounted.

  When a remote control monitoring system for remote control and monitoring of devices is constructed using this conventional system, the network terminal 3 sends an HTTP request packet (P1) to the HTTP server unit 200 of the center server 2 using the HTTP request packet (P1). 3, control information and control request information are sent from the HTTP server unit 200 to the network terminal 3 in response packet (P2).

On the other hand, the HTTP client unit 201 of the center server 2 sends a control or monitoring request command to the HTTP server unit 100 on the gateway 1 side to the gateway 1 side with an HTTP request packet (P3), and an HTTP response packet (P4). Thus, control request response information and monitoring request response information are transmitted from the gateway 1 to the center server 2 side.
JP 2002-315234 A

  However, in the conventional example as shown in FIG. 17, there is a problem that resource consumption (CPU, disk capacity, memory capacity constituting the gateway 1) is increased, and it is necessary to open the reception port of the gateway. There was a problem that it was difficult to ensure security.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a highly reliable remote control monitoring system capable of improving network security.

According to the first aspect of the remote control monitoring system of the present invention, a Web user interface processing unit that provides a user interface to an Internet terminal connected to the Internet, and a control / monitoring operation are performed from the Web screen of the Internet terminal. Control / monitoring request information is sent through the command processing unit that replaces the request information with a command in a predetermined format, and the command processing unit gives the command and the gateway connected to the Internet. A local server is connected between a center server having a gateway communication processing unit that performs command communication processing, a center server communication processing unit that performs command communication processing with the center server, and a control / monitoring target device. Command communication processing The gateway including a local transmission communication processing unit, and the target device controlled by a command transmitted through the local transmission communication processing unit of the gateway or returning status information to the local transmission communication processing unit of the gateway. Whether the center server communication processing unit of the gateway repeatedly polls the center server, and a command to be transmitted to the gateway is given from the command processing unit for each polling in the gateway communication processing unit of the center server. If the above command is given, the command is set, the polling response is sent to the gateway, and the center server communication processing unit of the gateway stores the setting file in which the setting value of the polling cycle is written The center server performs the polling in a cycle based on the setting value, and the center server writes the setting value in the setting file in a changeable manner by transmitting the setting value as a response to the polling. It is characterized by that.
Moreover, it is preferable that the said center server changes the said setting value of the said setting file so that the said polling period may become long when load increases.

  The invention of the remote control monitoring system according to claim 1 includes a Web user interface processing unit that provides a user interface to an Internet terminal connected to the Internet, and a control / monitoring operation performed from a Web screen of the Internet terminal. Control / monitoring request information is sent through the command processing unit that replaces the request information with a command in a predetermined format, and the command processing unit gives the command and the gateway connected to the Internet. A local server is connected between a center server having a gateway communication processing unit that performs command communication processing, a center server communication processing unit that performs command communication processing with the center server, and a control / monitoring target device. Command communication processing And the target device which is controlled by a command sent through the local transmission communication processing unit of the gateway or returns status information to the local transmission communication processing unit of the gateway. Whether the center server communication processing unit of the gateway repeatedly polls the center server, and a command to be transmitted to the gateway is given from the command processing unit for each polling in the gateway communication processing unit of the center server. If the above command is given, the command is set, the polling response is sent to the gateway, and the center server communication processing unit of the gateway stores the setting file in which the setting value of the polling cycle is written The The center server performs the polling in a cycle based on the set value, and the center server writes the set value as the response to the polling so that the set value of the set file can be freely changed. , Which can provide a system that can remotely control and monitor devices to be controlled and monitored from a network terminal connected to the Internet, polling the center server from the gateway, and sending commands from the center server in response By receiving, even if a router etc. intervenes and the firewall is set, commands can be received, so there is no need to set the router etc., workability is improved, and no gateway reception port is required To improve network security And a highly reliable remote control monitoring system can be realized. Further, when the load on the center server increases, the load on the center server can be reduced by transmitting the set value as the polling response from the center server and changing the polling cycle of the gateway.

  First, the present invention will be described from the basic configuration.

(Basic configuration)
FIG. 1 shows the overall configuration of the system of this configuration example. For example, various devices 5 such as electric devices to be controlled / monitored connected to a local bus 4 provided in a house H, and the local bus 4 side. And a router 8 for connecting the gateway 1 and the personal computer 6 to the Internet 7 and having a hub function for connecting the gateway 1 and the personal computer (personal computer) 6 to the Internet 1 and the Internet 7 and the home LAN. Equipped as in-house equipment.

  On the other hand, outside the house, the center server 2 is connected to the Internet 7 in order to provide services related to control and monitoring corresponding to a plurality of users who have installed in-house facilities. The center server 2 is prepared in a management center (not shown) installed by a service provider.

  Here, the center server 2 corresponds to the gateways 1 of a plurality of houses H, and the number of the corresponding gateways 1 is determined according to the processing capability.

  On the other hand, in order to enable the user to control and monitor the device 5 in the house H from outside the home, a network terminal 3 such as a personal computer or a mobile phone (browser phone) mounted on a web browser connected to the Internet 7 is used.

  Although the gateway 1 and the center server 2 are actually configured by computer systems, the functional configurations of the gateway 1 and the center server 2 which are important components in the present invention will be described with reference to FIGS.

  The gateway 1 has a functional configuration as shown in FIG. 2, and performs local communication for command communication processing between the center server communication processing unit 10 and the control / monitoring target device 5 via a local bus as shown in the figure. The center server communication processing unit 10 includes an HTTP client unit 10a and a storage unit 10b that stores a setting file in which the IP address of the center server 2 that is a polling destination is registered. Yes.

  The center server 2 has the functional configuration shown in FIG. 3, and displays a Web page for performing operations for controlling and monitoring the device 5 on the screen of the Web browser of the network terminal 3 and monitoring information as shown in the figure. HTTP server unit 21a for exchanging information by HTTP between Web user interface processing unit 20 including HTTP server unit 20a for providing a Web page for the purpose and HTTP client unit 10a on the gateway 1 side When receiving an HTTP request packet from the gateway 1 side, the gateway communication processing unit 21 that returns an HTTP response packet and the control / monitoring request information received from the Web user interface processing unit 20 are received. Converted as a request command and gateway communication processor 1 is also transferred to the Web user interface processing unit 20 by converting the control / monitoring request response command from the gateway 1 extracted from the request packet received by the gateway communication processing unit 21 into control result information and status information. Part 22.

  Next, the operation of this configuration example will be described in detail.

  First, when the equipment in the house H is activated, the HTTP client unit 10a of the center server communication processing unit 10 of the gateway 1 starts the HTTP of the gateway communication processing unit 21 of the center server 2 of the IP server stored in the storage unit 10b in advance. Polling for the server unit 21a is started at a predetermined cycle set by the built-in timer function as shown in FIG. 4A (step S1).

  In this case, first, it is checked whether there is a command (for example, a control request result response command or a monitoring request response command described later) that the center server communication processing unit 10 transmits to the center server 2 (step S2). If so, the command to be transmitted is set (step S3). If not, the HTTP request packet is transmitted to the center server 2 without being set (step S4).

  On the other hand, as shown in FIG. 4B, the HTTP server unit 21a of the center server 2 receives an HTTP request packet (step S10), extracts a received command in the request packet (step S11), and then to the gateway 1 Is sent from the command processing unit 22 (step S12). If there is a command to be sent (step S13), the command to be sent is set (step S13). If not set, the HTTP response packet is transmitted to the gateway 1 (step S14).

  Then, the HTTP client unit 10a of the gateway 1 that has received the HTTP response packet from the center server 2 in step S5 in FIG. 4A performs a process of extracting the received command from the HTTP response packet (step S6).

  As described above, the corresponding center server 2 is polled from the gateway 1, and the control request and the monitoring request command are transmitted from the center server 2 to the gateway 1 by the response packet in response to the polling. It has become. When the gateway 1 receives a control request command by a response packet, the gateway 1 connects a control request response command for confirming that the control request command has been received, and connects the local bus 4 for reception of the monitoring request command. A monitoring request response command indicating a state change of the monitoring target device 5 is transmitted by an HTTP request packet.

  FIG. 5 shows an HTTP packet transmission / reception sequence between the center server 2 and the gateway 1 shown in FIGS. 4A and 4B and an HTTP packet transmission / reception sequence between the center server 2 and the network terminal 3. The gateway 1 polls the center server 2 with the HTTP client unit 10a, and the HTTP server unit 21a of the center server 2 responds to the HTTP request packet (P3) from the gateway 1 with an HTTP response packet (P4). By transmitting this, a command is transmitted and received between the two.

  Between the network terminal 3 and the HTTP server unit 20a of the web user interface unit 20 of the center server 2, a request packet (P1) for requesting control and monitoring by operation on the web browser of the network terminal 3 is sent to the HTTP server. The information is received by the unit 20a (P1) and passed to the command processing unit 22, and the command processing unit 22 corresponds to the control request response command and the monitoring request response command of the device 1 received from the gateway communication processing unit 21. The control acceptance result information and the monitoring information are transmitted from the HTTP server unit 20a to the network terminal 3 by the response packet (P2), and the network terminal 3 confirms the information with a web browser.

  Here, a packet format example of the command will be described with reference to FIG.

  This packet format includes transmission destination address data A1, transmission source address data A2, data B indicating packet type (command), header portion in which data C indicating body length is written, and body portion D including data corresponding to the command. The relationship between the packet type and the data content of the body part D is the content shown in Table 1. The request line or response line is omitted in the figure.

  The control number, control content, status number, and status of the device 5 to be controlled / monitored connected to the local bus 4 are determined in advance, and such information is held in, for example, the command processing unit 22 of the center server 2. The command processing unit 22 sets the control number of the target device 5 and the control content when the control request command is processed, and the target device when the monitor request command is processed. Set the state number of 5. Further, when processing the control request response command received from the gateway 1, information indicating normality or abnormality is generated according to the contents of the body portion, and when the monitoring request response command is received, the corresponding device 5 A state number and information on the state are generated and passed to the Web user interface unit 20.

  On the other hand, when the gateway 1 receives the control request command from the center server 2, a control signal in a predetermined format is sent to the control target device 5 connected to the local bus 4 from the device number indicated as the content and the control content. To perform control corresponding to the control content. Further, the fact that this control request command is normally received is transmitted to the center server 2 by a request packet as a control request response command. Similarly, when a monitoring request command is received from the center server 2, status information is received through the local bus 4 from the device 5 of the status number connected to the local bus 4 from the status number indicated by the content, and as a monitoring request response command. A request packet is transmitted to the center server 2.

  As described above, in this configuration example, a command is sent from the center server 2 connected to the Internet 7 to the gateway 1 using an HTTP response packet, so that no reception port is required on the gateway 1 side. As a result, network security is improved. Can be improved.

  Moreover, since it becomes unnecessary to perform the setting for enabling the connection from the center server 2 to the gateway 1 by the router 8, the workability of the equipment on the house H side can be improved.

  Although not particularly mentioned, in this configuration example, encrypted communication (for example, HTTPS <Hyper Text Transfer Protocol Security> or the like) is used for communication between the center server 2 and the gateway 1 in order to increase security. Needless to say.

  Further, when the request information sent from the network terminal 3 to the center server 2 is a plurality of control requests or monitoring requests, the command processing unit 22 collects a plurality of commands in response to the plurality of requests and a response. You may make it transmit to the gateway 1 as a packet. Correspondingly, a plurality of commands of control request responses and monitoring requests sent from the gateway 1 may be collected and sent to the center server 2 as request packets.

  That is, in the request packet, as shown in FIG. 7A, a plurality of commands d1,... Similarly, in the response packet, a plurality of commands d1,... Are sent together in the multipart body part D shown in FIG.

  Here, in FIGS. 7A and 7B, HTTP / 1.1 is adopted as the HTTP version. In the request packet, the request, the request URL RQ in which the method, the request URL, and the protocol version are written, and the request are generated. The header part HD in which information on the user agent, the data length of the body part D, information on the media type (here, multipart), and the like are written, and the body part D are included.

  On the other hand, in the response packet, a status line SL including a protocol version, a status code number, and a related text phrase, and a response in which information such as data, data length of the body part D, media type (here, multipart) is written. It consists of a header part REH and a body part D.

  Since these are packet configurations used for HTTP / 1.1, only an outline will be given.

(Embodiment 1)
By the way, the number of gateways 1 corresponding to the center server 2 is limited by the processing capacity of the center server 2, but the load is reduced by changing the polling cycle of the gateway 1 when the load of the center server 2 increases. can do.

  Further, in a user's home that does not need to be controlled and monitored by the network terminal 3, by stopping polling from the gateway 1 to the center server 2, the traffic on the home LAN can be reduced.

  Therefore, in the present embodiment, the setting value of the polling cycle is written in the setting file stored in the storage unit 10b of the center server communication processing unit 10 in a changeable manner, and the polling cycle by the built-in timer is set based on the setting value. And can be set to stop polling itself. That is, here, the center server 2 and the personal computer 6 constitute a setting means for changing the failure.

  Since the system configuration, the configuration of the center server 2 and the configuration of the gateway 1 are basically the same, illustration and description of the configuration are omitted. The center server 2 can write the setting value of the polling cycle to the setting file, and can instruct the gateway 1 to stop polling from the home personal computer 6 via the LAN. .

  In this case, the setting can be changed by transmitting the set value data from the center server 2 as an HTTP response. The method for giving a command to stop polling to the gateway 1 is not particularly limited, and may be performed in a known format as appropriate.

  Thus, when the gateway 1 of this embodiment is activated, the center server communication processing unit 10 first performs polling at a predetermined cycle by the built-in timer as shown in FIG. 8 based on the setting value written in the setting file of the storage unit 10b. Although it starts (step S1), in the polling process, step S7 is provided for checking whether or not the polling stop is set in the setting file of the storage unit 10b, and it is determined that the stop is set in this step S7. If so, polling is stopped.

  Since the polling process is the same as the basic configuration, the same process steps as those in the flowchart shown in FIG.

  The other operations are also the same as the basic configuration, and the description is omitted.

(Embodiment 2)
In this embodiment, when a backup center server 2A having the same function as the center server 2 is connected to the Internet 7 as shown in FIG. 9 and the response from the center server 2 is interrupted for a predetermined time on the gateway 1, polling is performed. By switching the target to the backup center server 2A, the system is prevented from being down even when trouble occurs in the center server 2 or during maintenance.

  Since the configuration of the center server 2 is the same as that of the first embodiment, illustration and description thereof are omitted.

  Further, in the present embodiment, as shown in FIG. 10, a monitoring function unit 10c that monitors the interruption of response packet reception from the center server 2 is provided in the center server communication processing unit 10 on the gateway 1 side, and the storage unit 10b The IP address of the center server 2 and the IP address of the backup center server 2A are registered in advance in the setting file.

  When the polling is started from the gateway 1 to the center server 2, the center server communication processing unit 10 first sets the IP address of the center server 2 in step S1 as shown in FIG. The connection connection retry count counted by the function unit 10c is set to 0. Further, in this step S3, it is checked whether or not the retry count value exceeds a predetermined number (for example, 3 times). In S4, a connection is made to the center server 2, and when the connection is successful, the process proceeds to a normal mode process (step S5).

As a result, the above-described polling of HTTP request transmission from the gateway 1 to the center server 2 and response reception is performed at a cycle set by the built-in timer (steps S6 to S8). In the normal mode routine, in step S7, the monitoring function unit 10c checks for the presence of a socket error. Here, the socket in which the socket error occurs is disconnected (step S9), and the process returns to step S2.

  Then, through the processing of steps S1 to S3, connection to the center server 2 is performed in step S4, and when the connection fails, 1 is added to the count value of the number of retries (step S10), and the process proceeds to step S3. It is checked whether or not the count value exceeds a predetermined value, and if not, the connection connection in step S4 is retried. When connection failures continue and the number of retries reaches three, it is checked in step S11 whether the currently set IP address is the IP address of the backup center server 2A. Since the IP address of the center server 2 is set here, the IP address set in step S12 is switched to the IP address of the backup center server 2A, and the same processing as that for the center server 2 is performed.

  If a socket error occurs during the polling to the backup center server 2A, the connection is disconnected and then the connection is retried. When the number of retries reaches 3, the same in the step S11 as described above. It is checked whether the currently set IP address is the IP address of the center server 2A. In this case, since the set IP address is the IP address of the backup center server 2A, the operation of the center server communication processing unit 10 shifts to processing in the local mode (step S13). In this local mode, connection connection is first made using the IP address of the center server 2 (step S14), and if successful, the process proceeds to the normal mode of step S5 (in this case, the IP address is set to the IP address of the center server 2). If unsuccessful, connection is established with the IP address of the backup center server 2A (step S15). If successful, the process proceeds to the normal mode of step S5 (in this case, the IP address is set to the IP address of the backup center server 2A). ). If the connection fails, the processes in steps S14 and S15 are repeated until one of the connection connections succeeds in a cycle determined by the built-in timer (step S16).

  The local mode may be eliminated and the IP address of the center server to be polled may be switched every time the number of retries reaches 3.

  As described above, in this embodiment, when reception of a response packet from the center server 2 is interrupted for a predetermined time, the gateway 1 automatically switches the polling target to the IP address of the backup center server 2A. The system can be prevented from being down when the server 2 is down or during maintenance. Further, even when there is no response from the backup center server 2A, it is possible to automatically switch to the connection to the center server 2, so that it is possible to automatically return to the center server 1 at the end of the maintenance.

(Embodiment 3)
In the second embodiment, the response from the center server 2 is monitored on the gateway 1 side, but in this embodiment, the polling interval from the gateway 1 is monitored on the center server 2 (backup center server 2A) side. As shown in FIG. 12, the polling monitoring function unit 21b is provided in the gateway communication processing unit 21 to determine whether the gateway 1 is abnormal or the line is abnormal.

  Thus, in this embodiment, in the center server 2, when polling of the gateway 1 is started, the polling monitoring function unit 21b sets the built-in timer as shown in FIG. 13, and the built-in timer times up. Step S2 for checking whether or not the HTTP request packet has been received from the gateway 1 before the timer overflows is cyclically repeated, and the reception of the HTTP request packet from the gateway 1 is the time of the built-in timer. If it is not received before the up, the polling monitoring function unit 21b determines that an abnormality has occurred.

  The determination result is sent to a center-side server monitoring computer connected to the center server 2 via a LAN or the like and displayed on the monitor device, or a monitor device or a monitor lamp attached to the center server 2 itself is used as the determination result. Based on the display or lighting, the center side operator is informed that an abnormality has occurred in the gateway 1 or the line.

  As a result, the cause of the abnormality can be quickly investigated and the normal state can be restored.

  Since the configuration of the center server 2 of this embodiment can be applied to any of the first and second embodiments, the system configuration and the configuration of the gateway 1 are illustrated and described in any of the first and second embodiments. Reference is made to the description of. The operation other than the above-described monitoring operation of the polling interval of the gateway 1 is the same as the operation of the embodiment to be applied, and the description of the operation is also omitted.

(Embodiment 4)
In the first to third embodiments described above, the IP address of the polling center server 2 or backup center server 2A of the gateway 1 is stored in the setting file stored in the storage unit 10b in the center server communication processing unit 10 of the gateway 1 in advance. Although previously registered, in this embodiment, when the gateway 1 is started or when polling with the center server 2 is interrupted, the center server 2 or the backup center that is the polling destination for the gateway 1 is used. As shown in FIG. 14, a connection destination notification server 9 for notifying the IP address of the server 2A is provided on the Internet 7 and connected to the setting file stored in the storage unit 10b of the center server communication processing unit 10 of the gateway 1. The IP address of the destination notification server 9 is registered in advance.

  As shown in FIG. 15, the center server communication processing unit 10 is provided with a monitoring function unit 10c ′ for monitoring transmission of an HTTP response packet from the center server 2, and the HTTP client unit 10a has a connection destination notification server 9 at the time of startup. A function for sending a command requesting notification of the IP address of the center server 2 in a request packet, and also when the monitoring function unit 10c ′ detects that the HTTP response has been interrupted from the center server 2 The server 9 has a function of transmitting a command requesting the IP address of the backup center server 2A by a request packet.

  Thus, in this embodiment, when the gateway 1 is activated, the IP of the connection destination notification server 9 registered in advance in the setting file of the storage unit 10b by the HTTP client unit 10a of the center server communication processing unit 10 of the gateway 1 concerned. The address is read out, and an IP address request command of the center server 2 is sent to the connection destination notification server 9 using an HTTP request packet.

  When receiving the IP address request command of the polling destination center server 2 from the gateway 1 as shown in FIG. 16 (step S1), the connection destination notification server 9 first adds 1 to the count value n (step S2). The IP address of the N-th center server 2 is read from the server number-IP address opposing table 9a provided in the destination notification server 9 and notified to the gateway 1 that has sent the IP address request command with an HTTP response packet (step) S3).

  Then, it is checked whether the count value n is 500 (step S4). If the count value n is not 500 in this check, every time an IP address request command is sent, the step is continued until the count value n becomes 500. Steps S1 to S4 are repeated. When the count value n reaches 500, the number of the center server 2 whose IP address is to be notified is set to N + 1 in response to the IP address request command, and the count value n is returned to 0, and the process returns to step S1. Thereafter, the same IP address notification processing as described above is performed.

  Here, the maximum value 500 of the count value n indicates the number of gateways 1 to which the center server 2 per unit corresponds, and this 500 is only an example, and may exceed 500 depending on the capability of the gateway 1 or It may be less than 500. In FIG. 11, the initial process at the time of starting the system is omitted.

  When the IP address of the center server 2 is notified, the gateway 1 starts polling the center server 2.

  When the monitoring function unit 10c ′ of the center server communication processing unit 10 detects that the HTTP response packet has been interrupted for a predetermined time from the corresponding center server 2 after starting the polling operation as described above, this detection is responded. Then, the HTTP client unit 10a sends an IP address request command for requesting the IP address of the backup center server 2A to the connection destination notification server 9 in the same manner as at the time of start-up, in the same procedure as at the time of start-up. The connection destination notification server 9 is notified of the IP address of the backup center server 2A. The gateway 1 that has received the notification of the IP address performs processing for switching the IP address and changing the polling destination to the backup center server 2A.

  As described above, in the present embodiment, the connection destination notification server 9 is provided, and the gateway 1 connected to the center server 2 is automatically assigned at the time of startup, so that load distribution of the center server 2 can be automated, and each dwelling unit It is not necessary to register the IP address of the center server 2 or the IP address of the backup center server 2A in advance in the setting file of the gateway 1 installed in the server, and the IP address of the connection destination notification server 9 is fixedly registered. Since it becomes better just to keep it, the workability will be improved.

  Since the polling operation from the gateway 1 to the center server 2 is the same as in each of the above embodiments, the description of the operation is omitted. The polling monitoring operation of the monitoring function unit 10c 'is performed by the same method as the monitoring function unit 10c of the second embodiment. Further, in the first to third embodiments, each IP address setting configuration may be replaced with the configuration of the present embodiment.

  In the above-described embodiment, HTTP is used. However, a request / response type protocol from the client to the server may be used, and the protocol is not limited to HTTP.

  Further, the connection destination notification server 9 may be connected to the Internet 7 through a separate line from the center server 2 and the backup server 2A to increase safety when trouble occurs.

It is a system configuration diagram of the basic configuration of the present invention. It is a block diagram of the gateway used for the same as the above. It is a block diagram of the center server used for the same as the above. (A) is a flowchart for explaining the operation of the gateway used in the above.

(B) is a flowchart for explaining the operation of the center server used in the above.
It is sequence explanatory drawing of the polling operation | movement between the center server and gateway used for the same as the above, and the transmission / reception operation | movement between a center server and a network terminal. It is explanatory drawing of the packet format example of the command used for the same as the above. It is explanatory drawing of the packet example of the HTTP multipart used for the same as the above. It is a flowchart for operation | movement description of the gateway used for Embodiment 1 of this invention. It is a system configuration | structure figure of Embodiment 2 of this invention. It is a block diagram of the gateway used for the same as the above. It is a flowchart for operation | movement description of a gateway same as the above. It is a block diagram of the center server used for Embodiment 3 of this invention. It is a flowchart for operation | movement description of a center server same as the above. It is a system configuration | structure figure of Embodiment 4 of this invention. It is a block diagram of the gateway used for the same as the above. It is a flowchart for operation | movement description of the connection destination notification server used for the same as the above. It is sequence explanatory drawing of the polling operation | movement between the center server and gateway of a prior art example, and the transmission / reception operation | movement between a center server and a network terminal.

Explanation of symbols

1 Gateway 2 Center Server 3 Net Terminal 4 Local Bus 5 Device 6 Personal Computer 7 Internet 8 Router

Claims (2)

Control and monitoring operations are performed from a Web user interface processing unit that provides a user interface to an Internet terminal connected to the Internet and a Web screen of the Internet terminal, and request information for control and monitoring is sent through the Internet. A command processing unit that replaces the request information with a command in a predetermined format, and a gateway communication processing unit that receives the command from the command processing unit and performs command communication processing with a gateway connected to the Internet. A center server,
The gateway comprising: a center server communication processing unit that performs a command communication process with the center server; and a local transmission communication processing unit that performs a command communication process with a target device to be controlled / monitored via a local bus. When,
Controlled by a command sent through the local transmission communication processing unit of the gateway, or composed of the target device returning status information to the local transmission communication processing unit of the gateway,
The center server communication processing unit of the gateway repeatedly polls the center server. The center server gateway communication processing unit checks whether a command to be transmitted to the gateway is given from the command processing unit for each polling. If the command is given, the command is set, and the polling response is sent to the gateway. The center server communication processing unit of the gateway stores the setting file in which the setting value of the polling cycle is written. A storage unit, performing the polling in a cycle based on the setting value, and the center server writing the setting value in the setting file in a changeable manner by transmitting the setting value as a response to the polling. Remote control monitoring Stem. The remote control monitoring system according to claim 1, wherein the center server changes the setting value of the setting file so that the polling period becomes longer when a load increases.

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