JP4836920B2 - Network monitoring system and terminal device - Google Patents

Description

  The present invention relates to a network monitoring system for monitoring whether or not a terminal device is in a communicable state in a system including a plurality of terminal devices and a center device connected to the plurality of terminal devices via a network, and It relates to a terminal device.

  In the security system, a security terminal device installed in a security target building communicates with a security center device installed in a security company. For example, the security terminal device acquires an abnormal signal detected by a security sensor or the like installed in a security target building and transmits it to the security center device.

  In communication between the security terminal device and the security center device of such a security system, there is an increasing demand for users who want to use the Internet as a communication medium, which has a lower communication fee than dedicated lines and public telephone lines. .

  However, the Internet is more likely to cause communication failures and is less reliable than communication media such as a dedicated line and a public telephone line that are equipped with infrastructure for guaranteeing communication stability. Therefore, when the Internet is used as a communication medium in the security system, it is necessary to perform processing for monitoring the communication state between the security terminal device and the security center device at a higher frequency than when a dedicated line or a public telephone line is used. is there.

  In Patent Document 1, a plurality of terminals connected to a network management device are divided into a plurality of blocks (groups), a representative terminal is set for each group, and the representative terminal monitors the terminals in the group, and the monitoring is performed. A technique for notifying a network management apparatus of a result is disclosed. In the technique described in Patent Literature 1, the representative terminal monitors the terminals in the group so that the network management apparatus centrally monitors the communication with all the terminals connected to the network management apparatus. In comparison, the monitoring load on the network management device is reduced.

JP 2004-120357 A

  However, as in the technique described in Patent Document 1, in each of the groups including a plurality of terminals, in a system in which the communication state of the terminals in the group is monitored by a fixedly selected representative terminal, the representative terminal has a failure. When this occurs, monitoring of the terminals in the group cannot be continued until the representative terminal is restored or a new representative terminal is installed.

  In a system in which communication monitoring is performed by a representative terminal that is fixedly selected, signals for communication monitoring are concentrated in a network section in the vicinity of the terminal selected as the representative terminal. Therefore, in such a system, a larger communication load is applied in a network section near the representative terminal than in a network section near a terminal other than the representative terminal. For example, in the security system as described above, if communication monitoring is performed by a representative terminal fixedly selected, a security terminal device of a certain user is selected as the representative terminal. Further, the security terminal device of the above-described security system is normally connected to the Internet using a common line with other Internet connection devices (PC (personal computer) etc.) used by the user. Therefore, the user of the security terminal apparatus selected as the representative terminal uses his / her PC etc. to the Internet using a line with a larger communication load than other users for communication monitoring processing by the security terminal apparatus. Will be connected. Thus, a security system in which a specific user's security terminal device is a fixed representative terminal may cause unfairness to the user and is not desirable as a security system service.

  In addition, in a system in which communication monitoring is performed using a fixedly selected representative terminal, if the representative terminal must be removed due to user circumstances, a new representative terminal is set in the group, and the terminals included in the group This requires processing to change the settings, and is troublesome. Further, since such setting change processing is generally performed manually, a human error may occur in the setting change processing.

  A network monitoring system according to the present invention is a network monitoring system that detects a terminal device in which a center device and a plurality of terminal devices previously divided into groups are communicably connected via a network and communication is disabled. The terminal device sends a survival notification signal including an identification code assigned to the own device to all the terminal devices belonging to the group during a predetermined time common within the group to which the own device belongs. Survival confirmation means for performing broadcast transmission and reception of a survival notification signal and generating a survival terminal list which is a list of the identification codes included in the received survival notification signal, and at least the survival notification received by the survival confirmation means A notification terminal determination unit that determines that the own device is a notification terminal to the center device on the condition that the identification code of the own device is included in the signal And a center notification means for transmitting the surviving terminal list to the center device when the own device is determined to be a notification terminal, and the center device previously stores the identification codes assigned to all the terminal devices. The registered terminal information database, the surviving terminal list received from the terminal device, and the terminal information database are compared, and are included in the surviving terminal list despite being registered in the terminal information database. Faulty terminal detection means for detecting an identification code that has not been detected and outputting a terminal device corresponding to the detected identification code as being incapable of communication.

  In the network monitoring system, a terminal device dynamically determined from communicable terminal devices based on the result of sending and receiving the survival notification signal in the group sends information on the communication state in the group to the center device. Send.

  Therefore, even if a communication failure occurs in some terminal devices, information regarding the communication state within the group can be reliably transmitted to the center device.

  In addition, since the existence notification signal is transmitted by broadcast communication that does not require designation of individual addresses of the terminal devices in the group, it is possible to perform highly reliable monitoring that does not cause inconsistency of transmission destinations.

  Also, in the network monitoring system according to the present invention, the identification code employs a code having a predetermined order with the identification codes of other terminal devices in the group, and the notification terminal determination means includes the reception terminal From among the identification codes that have been selected, an identification code having a rank determined in common within the group is selected, and if the selected identification code matches the identification code of the own apparatus, the own apparatus notifies the center apparatus. It is determined that

  Therefore, the number of terminal devices that transmit information related to the communication state to the center device is about one in the group, and the communication load on the center device related to monitoring can be reduced.

  Further, in the network monitoring system according to the present invention, the center device further determines a rank determined in common within the group within a range not exceeding the order of the identification codes registered in the terminal information database. Determining means; and rank transmitting means for transmitting the rank determined by the rank determining means to all the terminal devices in the group.

  Moreover, in the network monitoring system according to the present invention, the center device further determines a reference number as a reference for ranking in the predetermined order within a range not exceeding the order of identification codes registered in the terminal information database. Reference number determining means, and reference number transmitting means for transmitting the reference number determined by the reference number determining means to all terminal devices in the group, wherein the notification terminal determining means Among them, the identification code closest to the reference number received from the center apparatus is selected, and if the selected identification code matches the identification code of the own apparatus, it is determined that the own apparatus is a notification terminal for the center apparatus.

  Thereby, since the terminal device which transmits the information regarding the communication state in the group to the center device is changed each time, the user of the terminal device does not feel unfair.

  Further, in the network monitoring system according to the present invention, the center device further includes a response request transmission unit that transmits a response request signal for requesting a response to all the terminal devices in the group, and the survival confirmation unit includes: The existence notification signal is broadcasted during the predetermined time before and after receiving the response request signal from the center device.

  Thereby, the transmission of the survival notification signal can be easily synchronized between the terminal devices, and the communication load of the center device related to the response request signal transmission can be reduced.

  The terminal device according to the present invention is a terminal device that is connected to the center device through a network so as to be communicable, and is divided into groups in advance, and during a predetermined time that is common within the group to which the device belongs. The identification information included in the received survival notification signal is transmitted to all terminal devices belonging to the group, and the survival notification signal including the identification code given to the device is broadcast and received. A survival confirmation means for generating a survival terminal list that is a list of codes, and if at least the survival notification signal received by the survival confirmation means includes an identification code of the own apparatus, the own apparatus is a notification terminal to the center apparatus. Notification terminal determining means for determining that there is a terminal, and center notifying means for transmitting the surviving terminal list to the center apparatus when the device is determined to be a notification terminal. To.

  According to the present invention, since the terminal device for notifying the center device for network monitoring is dynamically set, the network monitoring can be continued even if a failure occurs in any terminal device. Can provide a high system. Further, since communication between terminal devices is performed using broadcast communication, there is no inconsistency of communication destinations, and a highly reliable system can be provided.

  FIG. 1 is a block diagram showing an example of the configuration of a security system that functions as a network monitoring system according to one embodiment of the present invention. Referring to FIG. 1, the security system 1 includes a security center device 4 and security terminal devices 2-1, 2-2, 2-3,... (Hereinafter “security terminal device 2” connected via the Internet 3. Are sometimes collectively referred to as “)”.

  The security terminal device 2 is generally installed in an individual building that is a security target. The security center device 4 is usually installed in a security company in which a controller is stationed.

  The security center device 4 manages the security terminal devices 2 in groups, and each security terminal device 2 belongs to any group (terminal group). In the example of FIG. 1, the security terminal devices 2-1, 2-3, 2-6 belong to the terminal group 5-1, and the security terminal devices 2-2, 2-4, 2-5 are the terminal group 5-2. Belong to.

  The security center device 4 assigns a group address called a multicast address to each of the terminal groups 5-1, 5-2,... (Hereinafter may be collectively referred to as “terminal group 5”).

  The multicast address is a common address in each terminal group 5 and is used for multicast. Multicast is a communication method for transmitting packets having the same contents to a plurality of terminal devices in a network, and is sometimes called broadcast communication. Each terminal device included in the network can have a multicast address in addition to an IP (Internet Protocol) address. Each terminal device can receive packets addressed to the multicast address by registering the multicast address in the network. Multicast is standardly supported by IPv6 (Internet Protocol Version 6).

  The Internet 3 is configured by connecting relay devices (such as routers) having a routing function to each other. When each relay device receives a multicast address registration request from a terminal device, each relay device then configures itself to relay packets addressed to that multicast address to that terminal device, and sends the registration request to another relay device. Communicate to the device. In this way, a packet addressed to a multicast address reaches each of a plurality of terminal devices that have requested registration of the multicast address.

  In the following description, symbols shown in braces in FIG. 1 represent multicast addresses. Referring to FIG. 1, the multicast address of guard terminal devices 2-1, 2-3, 2-6 belonging to terminal group 5-1 is GA1, and guard terminal devices 2-2, 2 belonging to terminal group 5-2. The multicast address of −4, 2-5 is GA2.

  The security terminal device 2 is assigned in advance an identification number (hereinafter referred to as a terminal number) that uniquely identifies each security terminal device 2. The terminal number may be, for example, a serial number assigned in order of manufacture or order of shipment. In the following description, the symbol shown in square brackets in FIG. 1 represents the terminal number assigned to each guard terminal device 2. With reference to FIG. 1, the terminal numbers of the security terminal devices 2-1, 2-2, 2-3, 2-4, 2-5, 2-6 are 1, 2, 3, 4, 5, 6 respectively. It is.

  In addition, the actual security system 1 may be configured from more security terminal devices 2 than illustrated in FIG. 1, and one terminal group 5 may include more security terminal devices 2 than illustrated in FIG. 1. May contain. For example, the security system 1 may include several thousand to several tens of thousands of security terminal devices 2. In this case, one terminal group 5 includes several tens to several hundreds of security terminal devices 2, and the number of terminal groups reaches several hundreds.

  FIG. 2 is a block diagram illustrating an example of the configuration of the security terminal device 2.

  With reference to FIG. 2, the security terminal device 2 is connected to various sensors 6 via a sensor LAN (Local Area Network) 7. The sensor 6 is provided in a security target building where the security terminal device 2 is installed, or at the entrance of the building. The sensor 6 may be, for example, a security sensor that outputs a detection signal when detecting an intrusion action to a security target building, such as an infrared sensor, a magnet sensor, and a glass sensor. Further, for example, the sensor 6 may be a disaster prevention sensor that outputs a detection signal when a fire, a gas leak, or the like is detected, such as a heat sensor, a smoke sensor, and a gas sensor.

  The security terminal device 2 includes a control unit 21, a storage unit 22, a sensor LAN interface 23, and a LAN interface 24 that is a terminal communication unit.

  The control unit 21 is connected to the storage unit 22, the sensor LAN interface 23, and the LAN interface 24. The control unit 21 functions as a registration application unit 211, a survival notification processing unit 212 that is a survival confirmation unit of the present invention, a center notification terminal determination unit 213, a center notification unit 214, and an alarm transmission unit 215. The control unit 21 can be realized by an arithmetic device such as an MCU (Micro Control Unit), a CPU (Central Processing Unit), or a DSP (Digital Signal Processor). The control unit 21 can be realized by storing in the storage unit 22 a program describing the procedure of processing performed by each means of the control unit 21, and causing the arithmetic device as described above to read and execute the program. .

  The storage unit 22 stores information necessary for processing performed by the security terminal device 2, a program describing a procedure of processing performed by the control unit 21, and the like. As an example of information stored in the storage unit 22, a terminal number assigned to the security terminal device 2 (hereinafter also referred to as “own terminal number”), an IP address of the security terminal device 2, an IP of the security center device 4 Address (hereinafter also referred to as “center address”), multicast address assigned to the guard terminal device 2 (hereinafter also referred to as “own group address”), surviving terminal list, reference number, operation state, etc., which will be described in detail later Is mentioned. The storage unit 22 is realized by a storage device such as an EEPROM (Electrically Erasable Programmable Read Only Memory) and a flash memory.

  The sensor LAN interface 23 is an interface circuit that connects the security terminal device 2 and the sensor LAN 7. The control unit 21 receives a detection signal from the sensor 6 using the sensor LAN interface 23. The operation state of the security terminal device 2 includes two states, a security set state in which an alarm is transmitted to the security center device 4 when a detection signal is received from the sensor 6 and a security release state in which no alarm is transmitted. The operation state is switched by a user operating a mode switching unit (not shown), and the control unit 21 connected to the mode switching unit stores the operation state after switching in the storage unit 22.

  The LAN interface 24 is an interface circuit that connects the security terminal device 2 and the Internet 3. The security terminal device 2 communicates with the security center device 4 via the Internet 3 using the LAN interface 24. The LAN interface 24 has a buffering function and can store a signal received at least a predetermined time before (for example, 1 second before).

  The registration application unit 211 applies for registration of its own device to the security center device 4 to obtain its own group address, and requests registration of its own group address to the Internet 3 to enable broadcast communication.

  For this purpose, the registration application unit 211 first reads the center address and the own terminal number from the storage unit 22, generates a registration application signal including the own terminal number with the center address as the destination, and uses the LAN interface 24. Send a registration application signal.

  Next, the registration application unit 211 stores the multicast address transmitted from the security center device 4 in response to the registration application signal in the storage unit 22 as its own group address.

  Subsequently, the registration application unit 211 generates a registration request signal in a predetermined format including its own group address, and sends the registration request signal to the Internet 3 using the LAN interface 24.

  The survival notification processing unit 212 transmits and receives a survival notification signal. That is, the local group address and the local terminal number are read from the storage unit 22, and the survival notification signal including the local terminal number and the local group address as a destination is broadcast using the LAN interface 24, and the same terminal group as the local terminal 5 receives the survival notification signal broadcasted by the survival notification processing means 212 of the security terminal device 2 belonging to 5, using the LAN interface 24, extracts the terminal number from the survival notification signal, and stores the extracted terminal number It is additionally stored in the surviving terminal list of the unit 22.

  Each surviving terminal list of the security terminal device 2 lists the terminal numbers of the security terminal devices 2 in a communicable state among the security terminal devices 2 belonging to the same terminal group 5 as the own terminal. The information of the surviving terminal list is used as basic information for determining whether or not each of the security terminal devices 2 can communicate with the security center device 4.

  The processing by the survival notification processing unit 212 is performed when a response request signal is received from the security center device 4.

  The response request signal includes a reference number. When the response request signal is received, the control unit 21 extracts the reference number from the response request signal and stores the reference number in the storage unit 22.

  The center notification terminal determination unit 213 determines whether or not the own device is a center notification terminal. The center notification terminal is the security terminal device 2 that collects the surviving terminal list of the terminal group 5 to which the own device belongs and notifies the security center device 4 of the list.

  For this purpose, the center notification terminal determination unit 213 reads the own terminal number, the surviving terminal list, and the reference number from the storage unit 22, and “center-notifies the terminal number closest to the reference number among the terminal numbers included in the surviving terminal list. Select one terminal number from the list of surviving terminals according to the rule “select as the terminal number of the terminal”, and if the selected terminal number matches the own terminal number, the own device is determined as the center notification terminal, and does not match In this case, it is determined that the own device is not the center notification terminal. According to the above determination, when at least the identification number of the own device is included in the surviving terminal list, the own device can be determined as the notification terminal.

  The above rules are stored in advance in common with each security terminal device 2 as part of the program of the center notification terminal determination means 213. The processing by the center notification terminal determination unit 213 is autonomously performed in each guard terminal device 2 after the processing by the survival notification processing unit 212.

  The center notification unit 214 transmits the surviving terminal list to the security center device 4. For this purpose, the center notification unit 214 reads the center address and the surviving terminal list from the storage unit 22 and transmits the surviving terminal list using the LAN interface 24 with the center address as the destination.

  The processing by the center notification unit 214 is performed when the center notification terminal determination unit 213 determines that the own apparatus is the center notification terminal.

  The alarm transmission unit 215 transmits an alarm signal indicating that an abnormality has occurred in the security target to the security center device 4. For this purpose, the alarm transmission unit 215 reads the center address and the own terminal number from the storage unit 22, generates an alarm signal including the own terminal number with the center address as the destination, and transmits the alarm signal using the LAN interface 24. To do.

  The processing by the alarm transmission unit 215 is performed when the detection signal is received from the sensor 6 and the operation state stored in the storage unit 22 is in the security set state.

  Furthermore, the security terminal device 2 includes clock means and timer means (not shown). The security terminal device 2 can acquire the current time by the clock means, and can measure the time at a predetermined interval by the timer means.

  FIG. 3 is a block diagram illustrating an example of the configuration of the security center device 4. The security center device 4 is realized by a general server computer. The security center device 4 includes a control unit 41, a storage unit 42, an input unit 43, a LAN interface 44 that is a center communication unit, and a display unit 45.

  The control unit 41 is connected to the storage unit 42, the input unit 43, the LAN interface 44, and the display unit 45. The control unit 41 functions as a terminal registration unit 411, a reference number determination unit 412, a response request transmission unit 413, a failure terminal detection unit 414, and an alarm processing unit 415. The control unit 41 is realized by an arithmetic device such as a CPU of a computer. The control unit 41 can be realized by storing in the storage unit 42 a program describing the procedure of processing performed by each means of the control unit 41, and causing the CPU of the computer to read and execute the program.

  The storage unit 42 stores information necessary for processing performed by the control unit 41, a program describing a procedure of processing performed by the control unit 41, and the like. The storage unit 42 is realized by a storage device such as a semiconductor memory and an HDD (Hard Disk Drive).

  Referring to FIG. 3, the storage unit 42 includes a terminal information database 421. The terminal information database 421 is a database that stores the correspondence relationship between the security terminal device 2, the terminal group 5, and the multicast address. The terminal information database 421 includes, for example, a record including a set of the terminal number and multicast address of the security terminal device 2. The multicast address can also be used as an identification symbol of the terminal group 5.

  FIG. 4 shows an example of data contents stored in the terminal information database 421 when the security terminal devices 2 are grouped as illustrated in FIG. 1 in the security system 1. In the table shown in FIG. 4, in addition to the items of the terminal number and the multicast address, the record corresponding to each security terminal apparatus 2 can communicate between the security terminal apparatus 2 and the security center apparatus 4. The item of “life and death state” which is information indicating the above is included. The life and death state is information indicating whether or not the communication state between the security terminal device 2 and the security center device 4 is normal. In the example of FIG. 4, if the value of the item “life and death” in the record of each terminal number is “1”, it means that the communication state between the security terminal device 2 and the security center device 4 is normal. If the value of the item “life and death” is “0”, it indicates that the communication state is abnormal. Processing related to the setting of the value of the “life and death state” item will be described later.

  Referring to FIG. 3 again, the storage unit 42 further stores a security target database (not shown). The security target database is associated with the terminal number of each security terminal device 2, and the security target of the security terminal device 2 such as the address of the building where the security terminal device 2 is installed and the contact information of the owner of the building. It is a database that stores information related to.

  The input unit 43 is realized by an input device such as a keyboard and a mouse. For example, the controller can input an instruction for the security center device 4 to the input unit 43.

  The LAN interface 44 is an interface circuit that connects the security center device 4 and the Internet 3. The security center device 4 communicates with the security terminal device 2 via the Internet 3 using the LAN interface 44.

  The display unit 45 displays an alarm received from the security terminal device 2 and information on the detected communication abnormality. The display unit 45 is realized by a liquid crystal display or a CRT (Cathode Ray Tube) display.

  Upon receiving the registration application signal from the security terminal device 2, the terminal registration unit 411 performs registration that causes the security terminal device 2 that has transmitted the registration application signal to belong to the terminal group 5.

  That is, the multicast address to be given to the security terminal device 2 that has transmitted the registration application signal is determined, and the terminal number extracted from the registration application signal is associated with the determined multicast address and stored in the terminal information database 421 of the storage unit 42. At the same time, a registration permission signal including the determined multicast address is generated, and the registration permission signal is transmitted to the security terminal device 2 that has transmitted the registration application signal using the LAN interface 44.

  The reference number determination unit 412 determines a reference number used as a reference when the security terminal device 2 determines the center notification terminal, and outputs the reference number to the response request transmission unit 413.

  The reference number is determined by adding a predetermined value to the previous reference number within a range from the minimum value to the maximum value of the identification number stored in the terminal information database 421, or determined randomly. , Determined as a value different from the previous time.

  The response request transmission unit 413 transmits a response request signal for requesting a response to all the security terminal devices 2. A reference number is included in the response request signal. That is, the response request transmission unit 413 also serves as a reference number transmission unit.

  For this purpose, the response request transmission unit 413 generates a response request signal including the reference number input from the reference number determination unit 412 and refers to all of the registered information by referring to the terminal information database 421 in the storage unit 42. The multicast address is read, and a response request signal generated with the read multicast address as the destination is transmitted using the LAN interface 44. The processing by the response request transmission unit 413 is periodically performed.

  The faulty terminal detecting means 414 checks the surviving terminal list against the terminal information database to check whether each of the guard terminal devices 2 is in a communicable state and causes the display unit 45 to display the confirmed state.

  When the surviving terminal list is received from the center notification terminal, the faulty terminal detecting unit 414 extracts the terminal number from the surviving terminal list and refers to the terminal information database, but is registered in the terminal information database. The terminal number that is not extracted from is detected as a terminal number that identifies the security terminal device 2 (failed terminal) that is in an incommunicable state, and information related to the detected failed terminal is displayed on the display unit 45.

  When the alarm processing unit 415 receives an alarm signal from the security terminal device 2, the alarm processing unit 415 extracts a terminal number from the alarm signal and associates the terminal number extracted from the alarm signal with reference to the security target database. The security target information is acquired, and the acquired security target information is displayed on the display unit 45.

  Furthermore, the security center device 4 also includes a clock unit and a timer unit (not shown), and can acquire the current time from the clock unit and measure a predetermined time by the timer unit.

  Hereinafter, the network monitoring process in the security system 1 will be described.

  FIG. 5 is a flowchart illustrating an example of a procedure of processing performed in the security terminal device 2. When the security terminal device 2 is connected to the Internet 3 and the sensor LAN 7 and the power is turned on, each unit and each means of the security terminal device 2 starts operation, initialization processing is performed, and the processing of the flowchart illustrated in FIG. Be started.

  Referring to FIG. 5, in step S <b> 20, control unit 21 refers to storage unit 22 and confirms whether the group address has already been stored in storage unit 22. If the own group address is not stored (NO in step S20), the process proceeds to registration application processing (steps S21 to S24) by registration application means 211, and the own group address is stored (YES in step S20). The process proceeds to step S25. For example, when the security terminal apparatus 2 is newly installed, and the affiliated terminal group of the security terminal apparatus 2 has not yet been determined, the multicast address is not stored in the storage unit 22. On the other hand, for example, when the security terminal device 2 to which the affiliated terminal group has already been determined is restarted, such as when maintenance of the security terminal device 2 is performed, the own group address is stored in the storage unit 22. .

  In step S <b> 21, the registration application unit 211 generates a registration application signal including information indicating that it is a registration application and its own terminal number, and transmits the generated registration application signal to the security center device 4.

  Thereafter, the registration application unit 211 receives a registration permission signal returned from the security center apparatus 4 in response to the registration application signal (step S22), extracts a multicast address included in the registration permission signal, and sets it as its own group address. It memorize | stores in the memory | storage part 22 (step S23).

  Next, in step S24, the registration application unit 211 sends a registration request signal including its own group address to the Internet 3 so that a packet destined for its own group address is delivered to its own device. .

  After the multicast communication setting process (step S24), the process related to alarm transmission (steps S25 and S26) and the process related to communication monitoring (steps S27 and S28) are repeatedly performed.

  In step S <b> 25, the control unit 21 determines whether or not to transmit an alarm for notifying the security center apparatus 4 of the occurrence of an abnormality such as an intrusion act or a fire in the security target. For this determination, the control unit 21 determines whether or not a detection signal is input from the sensor 6. When the detection signal is input, the control unit 21 refers to the storage unit 22 to confirm the operation state of the security terminal device 2, and if the operation state is the security set mode, the alarm transmission unit 215 performs the security center device. An alarm transmission process (step S26) for transmitting an alarm signal to 4 is performed. When the detection signal is not input from the sensor 6 or when the operation state is the security release mode, the process proceeds to NO in step S25, and the process proceeds to step S27 without performing the alarm transmission process.

  In step S27, the control part 21 confirms whether the response request signal from the security center apparatus 4 is received. If a response request signal has been received (YES in step S27), the communication monitoring process in step S28 is executed. If no response request signal has been received (NO in step S27), the process returns to step S25. .

  With reference to FIG. 6, an example of the procedure of the communication monitoring process in step S28 of FIG. 5 will be described. When the communication monitoring process in step S28 of FIG. 5 is started, the process of the flowchart illustrated in FIG. 6 is started.

  With reference to FIG. 6, the control unit 21 of the security terminal device 2 that has received the response request signal from the security center device 4 first extracts a reference number from the response request signal in step S290 and extracts the extracted reference number. Is stored in the storage unit 22. Next, the control unit 21 causes the survival notification processing unit 212 to transmit / receive a survival notification signal to generate a survival terminal list (steps S291 to S296).

  In step S291, initialization for emptying the surviving terminal list stored in the storage unit 22 is performed.

  In step S292, the life notification processing unit 212 generates a life notification signal including information indicating that it is a life notification and its own terminal number, and transmits the generated life notification signal with the self group address as a destination. This survival notification signal is broadcast to all the security terminal devices 2 belonging to the same terminal group 5 as the own device.

  At approximately the same time, the other security terminal device 2 that has received the response request signal from the security center device 4 also broadcasts a survival notification signal.

  Note that, for example, when a failure occurs in communication between the security center device 4 and the security terminal device 2, the response request signal is guarded even though the security center device 4 has transmitted the response request signal. The terminal device 2 may not be able to receive. In this case, in the process in the security terminal device 2, it is determined NO in step S27 in FIG. 5, and the communication monitoring process (step S28 in FIG. 5, FIG. 6) is not performed. The signal is not broadcast.

  In subsequent step S293, the survival notification processing unit 212 starts measuring a predetermined timeout time (for example, 2 seconds) by the timer unit.

  Next, in step S294, the survival notification processing unit 212 determines whether a survival notification signal has been received. Here, the survival notification signal transmitted in step S292 by the own device's existence notification processing means 212 or the existence notification processing means 212 of another guard terminal device 2 belonging to the same terminal group 5 as the own device. A survival notification signal is received. If it is determined that the existence notification signal has been received, the process proceeds to step S295, and if it is determined that it has not been received, the process proceeds to step S296 without performing step S295.

  In step S295, the survival notification processing unit 212 extracts the terminal number from the received survival notification signal, and additionally registers the extracted terminal number in the survival terminal list stored in the storage unit 22.

  At this time, a survival notification signal that has already been received within one second before the start of time measurement by the timer means and is buffered by the LAN interface 24 is also a target of processing for adding to the survival terminal list. That is, the survival notification signal received in 3 seconds before and after receiving the response request signal from the security center device 4 in each security terminal device 2 becomes the object of processing. By doing in this way, even if there is an error in the arrival time of the response request signal from the security center device 4 between the security terminal devices 2, this can be absorbed.

  In step S296, the survival notification processing unit 212 determines whether or not a timeout has occurred, that is, whether or not the timeout period has elapsed. If not time-out, the process returns to step S294, and the processes after step S294 are repeated. In the case of timeout, the process proceeds to step S297.

  When the time-out occurs (YES in step S296), the survival terminal list stored in the storage unit 22 receives the response request signal from the security center apparatus 4 in the terminal group 5 to which the own apparatus belongs and accompanying it. The terminal number of the security terminal device 2 that has transmitted the survival notification signal is registered. Therefore, the security terminal device 2 with the terminal number registered in the surviving terminal list is in a communicable state, and further, the communication state with the security center device 4 is normal, that is, as a center notification terminal It can be said that it is preferable.

  In step S297, the control unit 21 uses the center notification terminal determination unit 213 to determine whether or not the device itself is a center notification terminal according to a preset rule. The center notification terminal determination unit 213 first refers to the storage unit 22 and reads the reference number received from the security center device 4 in step S291 and the terminal number registered in the surviving terminal list.

  For example, the center notification terminal determination unit 213 determines that the device itself is a center notification terminal if the following (condition 1) or (condition 2) is satisfied, and satisfies both (condition 1) and (condition 2). Otherwise, it is determined that the own device is not a center notification terminal.

(Condition 1) The own terminal number is greater than or equal to the reference number, and all the terminal numbers in the surviving terminal list are greater than or equal to the own terminal number or less than the reference number.
(Condition 2) The own terminal number is less than the reference number, and all the terminal numbers in the surviving terminal list are less than the reference number and greater than or equal to the own terminal number.

  The determination of the center notification terminal according to the above (Condition 1) and (Condition 2) means that when the terminal numbers and the reference numbers included in the surviving terminal list are arranged in ascending order to form a circulation list, The terminal number closest to the forward direction of the list (the direction in which the terminal number increases) is selected as the terminal number of the center notification terminal, and if the selected terminal number matches the own terminal number, the own apparatus is determined as the center notification terminal. Can be taken as a thing.

For example, with reference to FIG. 7, the selection of the center notification terminal using the circulation list as described above will be described. FIG. 7 shows an example of a cyclic list generated when L _i (i = 1, 2, 3,..., K,..., N) is a terminal number included in the surviving terminal list and ST is a reference number. Show.

7 (a) is between each terminal number and the reference number, an example of a circular list when the magnitude relationship represented by _{L 1 <L 2 <... <} ST <L k <... <L N Show. In the example shown in FIG. 7A, since the terminal number closest to the forward direction of the circulation list from the reference number ST is L _k , the terminal number L _k is selected as the terminal number of the center notification terminal. In the example shown in FIG. 7 (a), in the security terminal 2 of terminal number L _k, the (Condition 1) is satisfied, in the security terminal device 2 other than the terminal number L _k, the (Condition 1) and None of (Condition 2) is satisfied.

FIG. 7B shows an example of a circulation list when there is a magnitude relationship represented by L ₁ <L ₂ <L ₃ <... <L _N <ST between each terminal number and the reference number. The example of FIG. 7B is an example when the reference number ST is larger than the maximum value L _N of the terminal numbers in the surviving terminal list. In the example of FIG. 7B, the terminal number closest to the reference number ST in the forward direction of the circulation list is L ₁ (that is, the minimum value of the terminal numbers in the surviving terminal list), and the terminal number L ₁ is the center number. Selected as the terminal number of the notification terminal. In the example shown in FIG. 7 (b), in the security terminal 2 of terminal number L _1, the condition 2 is satisfied, in the security terminal device 2 other than the terminal number L _1, the (Condition 1) and None of (Condition 2) is satisfied.

  If a terminal number equal to the reference number exists in the surviving terminal list, the terminal number is selected as the terminal number of the center notification terminal. In this case, the above (condition 1) is satisfied in the security terminal device 2 of the selected terminal number, and any of the above (condition 1) and (condition 2) is satisfied in the security terminal device 2 other than the selected terminal number. Is not satisfied.

  Referring to FIG. 6 again, in step S298, control unit 21 determines whether or not its own device is determined as the center notification terminal in the center notification terminal determination process (step S297). If the own apparatus is determined as the center notification terminal, the process proceeds to the response signal transmission process in step S299. If the own apparatus is not determined as the center notification terminal, the communication monitoring process (FIG. 5) is performed without performing step S299. Step S28) ends, and the process returns to step S25 of FIG.

  In step S 299, the center notification unit 214 transmits the terminal number registered in the surviving terminal list stored in the storage unit 22 to the security center device 4. After step S299, the process returns to step S25 in FIG.

  As described above, since the center notification terminal is dynamically determined from the security terminal devices 2 that have been able to communicate as a result of broadcast transmission in the terminal group 5, communication is performed with some of the security terminal devices 2. Even if a failure occurs, the security center device 4 can be surely notified.

  Moreover, since the center notification terminal is determined from the security terminal device 2 that has confirmed that communication with the security terminal device 2 that has received the response request signal from the security center device 4, that is, the security center device 4, is possible, Further, the security center device 4 can be notified with certainty.

  Further, since only the center notification terminal (one in one terminal group 5 except for an exceptional case described later) notifies, the communication load of the security center device 4 can be reduced.

  In the above description with reference to FIG. 5, the processing related to alarm transmission (steps S25 and S26) has been described as a part of the loop processing (steps S25 to S28) performed after step S24. However, the processing of steps S25 and S26 may be interrupt processing performed using the detection signal input from the sensor 6 as a trigger. That is, the processes in steps S25 and S26 may be executed at the time when the detection signal is received at any time of the loop process after step S24.

  Hereinafter, with reference to FIGS. 8 and 9, an example of a procedure of processing performed in the security center device 4 will be described. In the following description, it is assumed that the data illustrated in FIG. 4 is registered in the terminal information database 421 stored in the storage unit 42 of the security center device 4. Further, in the following description, the storage unit 42 stores addresses assigned to each provider in the Internet 3 and route information on which packets are transferred within each provider's subnetwork (usually a column of relay devices through which packets pass). It is assumed that information about providers that operate each sub-network configuring the Internet 3 is stored in advance.

  When the security center device 4 is connected to the Internet 3 and the power is turned on, a predetermined initialization process is performed, each unit and each means of the security center device 4 starts operating, and the processing of the flowchart illustrated in FIG. 8 is started. Is done. As a part of this initialization process, the control unit 41 acquires the current time from a clock unit (not shown), and stores the current time in the storage unit 42 as an initial value of the monitoring time.

  With reference to FIG. 8, first, in step S <b> 40, the control unit 41 confirms whether an alarm signal is received from the security terminal device 2. If an alarm signal has been received (YES in step S40), the process proceeds to step S41. If not received (NO in step S40), the process proceeds to step S42 without performing the process in step S41.

  In step S41, the alarm processing means 415 performs a process of displaying information related to the received alarm signal on the display unit 45. For example, the alarm processing unit 415 extracts a terminal number from the alarm signal received in step S40, searches the security target database based on the extracted terminal number, and acquires information on the security target associated with the terminal number. To do. And the alarm information containing the information which represents that the acquired information of the guard object and the alarm signal was received is displayed on the display unit 45. By checking the alarm information displayed on the display unit 45, the controller can take measures such as dispatching a guard to the guard target.

  In step S <b> 42, the terminal registration unit 411 determines whether a registration application signal is received from the security terminal device 2. This registration application signal is transmitted to the security center device 4 by the security terminal device 2 for which the group to which it belongs has not yet been determined in the processing of the security terminal device 2 described with reference to FIG. 5 (step S21 in FIG. 5). ) Signal. If the registration application signal is received, the process proceeds to step S43, and the terminal registration unit 411 performs the registration process of steps S43 to S45. If the registration application signal has not been received, the process proceeds to step S46 without performing the registration process (steps S43 to S45).

  In step S43, the terminal registration unit 411 first extracts a transmission source address from the registration application signal received in step S42. Then, referring to the storage unit 42, the provider to which the extracted transmission source address belongs, the route information in the provider, and the like are read out. Next, the terminal group 5 to which the security terminal device 2 of the transmission source belongs so that the security terminal devices 2 belonging to the same terminal group 5 are close to each other on the basis of the information related to the provider read from the storage unit 42. That is, a multicast address to be given to the security terminal device 2 is determined. Here, “the security terminal devices 2 are close to each other in a network” means that, for example, in communication between the security terminal devices 2, the number of hops (the number of relay devices through which the packet passes) or the packet transfer time is small. It means to become.

  Next, in step S <b> 44, the terminal registration unit 411 generates a registration permission signal including information indicating registration permission and a multicast address assigned to the guard terminal device 2. And the produced | generated registration permission signal is sent in response with respect to the security terminal device 2 which has transmitted the registration application signal.

  After that, in step S45, the terminal registration unit 411 stores a record including the terminal number included in the registration application number received in step S42 and the multicast address given in step S43 in the terminal information database 421 of the storage unit 42. Create a new record and register the generated record.

  Next, in step S46, the control unit 41 compares the current time acquired from the clock means with the monitoring time stored in the storage unit 42 to confirm whether the monitoring time has arrived. If the monitoring time has arrived (YES in step S46), the communication monitoring process in step S47 is executed.

  FIG. 9 shows an example of a detailed procedure of the communication monitoring process (step S47 in FIG. 8).

  In step S470, the reference number determination unit 412 determines a reference number used in the center notification terminal determination process (step S297 in FIG. 6) in the security terminal device 2. In step S470, the reference number determination means 412 determines a value different from the reference number determined in the reference number determination process (step S470) performed last time as the current reference number. For example, the reference number determination unit 412 reads the reference number in the previous reference number determination process from the storage unit 42, and determines a value obtained by adding a predetermined value to the read reference number as the current reference number. This predetermined value may be either positive or negative. When the value obtained by adding a predetermined value to the read reference number exceeds the range of the terminal number value of the guard terminal device 2, the value is corrected to be within the range of the terminal number value of the guard terminal device 2. The reference number determination unit 412 stores the determined reference number in the storage unit 42 for reference in the next reference number determination process.

  As another example of the method for determining the reference number, a value selected at random between the minimum value and the maximum value of the terminal number of the security terminal device 2 may be used as the reference number.

  By changing the value of the reference number without deviation by the reference number determination means 412, the bias of the security terminal apparatus 2 selected as the center notification terminal by the center notification terminal determination means 213 of the security terminal apparatus 2 can be reduced. Communication to the center device 4 can be monitored without bias, and unfairness of the user can be reduced.

  After determining the reference number, the response request transmission unit 413 transmits a response request signal to all the security terminal devices 2 in step S471. In step S471, the response request transmission unit 413 first extracts all multicast addresses stored in the terminal information database 421 of the storage unit 42 (the same multicast address is extracted as one). Next, a response request signal including information indicating that it is a response request and the reference number determined in step S470 is generated. Then, the generated response request signal is sent to the Internet 3 with the multicast address extracted from the terminal information database 421 as the destination. The response request signal is broadcast to all the security terminal devices 2 via the Internet 3.

  Thereafter, in step S472, the faulty terminal detecting unit 414 initializes the terminal information database 421 by setting the value of the life and death state item (see FIG. 4) included in the records of all terminal numbers to “0”. .

  Next, in step S473, the faulty terminal detection unit 414 causes the timer unit to start measuring a predetermined timeout time (for example, 10 seconds).

  After the timer is started, in step S474, the faulty terminal detection unit 414 determines whether or not a surviving terminal list has been received from the center notification terminal. If it is determined that the surviving terminal list has been received, the process proceeds to step S475, and if it is determined that it has not been received, the process proceeds to step S476 without performing step S475.

  In step S475, the faulty terminal detection unit 414 extracts the terminal number included in the surviving terminal list received in step S474, and the value of the life / death state item included in the record of the terminal information database 421 corresponding to the extracted terminal number. Is set to “1”. By performing the process of step S475 for one surviving terminal list, a plurality of security terminal devices included in one terminal group 5 to which the center notification terminal that is the transmission source of the surviving terminal list belongs in the terminal information database 421. The life and death status of 2 is updated.

  In step S476, the failure terminal detection unit 414 determines whether or not a timeout has occurred, that is, whether or not the timeout time has elapsed. If it is not time-out, the process returns to step S474, and the processes after step S474 are repeated. In the case of timeout, the process proceeds to step S477.

  Note that the timeout time in step S476 is set to a value larger than the time for waiting for the reception of the survival notification signal in the communication monitoring process of the guard terminal device 2 (step S296 in FIG. 6).

  In step S477, the faulty terminal detection unit 414 refers to the terminal information database 421 in the storage unit 42, and extracts the terminal number of the record in which the value of the item of life and death is “0”. The terminal number of the record in which the value of the item of life and death is “0” is notified to the center of the terminal number not included in the surviving terminal list received in step S474 or the surviving terminal list within a predetermined time. This is the terminal number of the security terminal device 2 belonging to the terminal group 5 that could not be made. That is, the terminal number of the faulty terminal. Therefore, there is a possibility that a failure has occurred in the communication between the security terminal device 2 and the security center device 4 corresponding to these terminal numbers.

  In step S478, it is determined whether the terminal number of the faulty terminal has been extracted in step S477. When the terminal number of the faulty terminal is extracted, the faulty terminal detection unit 414 performs fault information display processing in step S479. If the terminal number of the faulty terminal is not extracted, the communication monitoring process ends without performing the fault information display process. When the communication monitoring process is completed, the control unit 41 stores the time after a preset time (for example, 10 seconds) from the monitoring time stored in the storage unit 42 as a new monitoring time in the storage unit 42. Store, and the process returns to step S40 in FIG.

  In step S479, the faulty terminal detection unit 414 performs processing for displaying information on the faulty terminal on the display unit 45. For example, the faulty terminal detection means 414 includes the terminal number of the faulty terminal, the IP address of the faulty terminal, and information acquired from the security target database regarding the terminal number of the faulty terminal (such as the address of the building where the security terminal device 2 is installed) The contact information of the owner of the building is displayed on the display unit 45. The controller stationed at the security center can cope with the communication failure by confirming the information displayed on the display unit 45 in step S479.

  For example, the controller uses the IP address of each faulty terminal displayed on the display unit 45 as a destination and inputs various types of information such as UNIX (registered trademark) OS (Operating System) or Windows (registered trademark) OS via the input unit 43. By executing a ping command that is generally used in the OS, the communication state between each faulty terminal and the security center device 4 can be confirmed. By executing the ping command, a response request signal (Echo Request packet) is transmitted to the device at the destination address, and it can be confirmed whether or not a response signal (Echo Reply packet) is returned from the device at the destination address. Further, for example, when information on the communication path between each faulty terminal and the security center device 4 is obtained, a communication fault can be obtained by executing the above ping command for each relay device included in the communication path. It is also possible to specify the relay device in which the error occurs. In addition, if necessary, the controller notifies the owner of the building to be guarded where the faulty terminal is installed or the provider providing the connection of the faulty terminal to the Internet 3 about the occurrence of the communication fault. Can also be dealt with.

  After the failure information display process (step S479), the control unit 41 sets a time after a preset time (for example, 10 seconds) from the monitoring time stored in the storage unit 42 as a new monitoring time. It memorize | stores in the memory | storage part 42, and a process returns to FIG.8 S40.

  As described above, in addition to the processing described with reference to FIGS. 8 and 9, in the security center device 4, when the security terminal device 2 is removed from the security system 1 due to cancellation of the security contract, the terminal information database 421 Update processing is performed. In this update process, for example, the controller operates the input unit 43 and inputs the terminal number and the deletion instruction of the security terminal device 2 to be removed. Upon receiving the deletion instruction, the control unit 41 updates the data content of the terminal information database 421 by deleting the record of the input terminal number from the terminal information database 421 of the storage unit 42.

  Hereinafter, a specific example of the communication monitoring process performed in the embodiment described above will be described focusing on the center notification terminal determination process (step S297 in FIG. 6) in the guard terminal device 2. In the following specific example, a case will be described in which the data illustrated in FIG. 4 is registered in the terminal information database 421 of the security center device 4 in the security system 1 illustrated in FIG.

  First, referring to FIG. 10, the reference number is “1”, a communication failure has occurred between the security terminal device 2-4 and the security center device 4, and the security center device 4 in the security terminal device 2-4. A case where the response request signal from the terminal cannot be received will be described. In the example shown in FIG. 10, it is assumed that the communication state between the security terminal device 2 other than the security terminal device 2-4 and the security center device 4 is normal.

  Fig.10 (a) shows the state of communication in the terminal group 5-1, and the content of the survival terminal list produced | generated in each guard terminal device 2-1, 2-3, 2-6.

  Referring to FIG. 10A, each of the security terminal devices 2-1, 2-3, 2-6 included in the terminal group 5-1 receives a response request signal from the security center device 4 (in FIG. 5). Step S27). Next, the survival notification signal is exchanged between the security terminal devices 2 in the terminal group 5-1 (steps S292 to S296 in FIG. 6).

  The security terminal devices 2-1, 2-3, and 2-6 generate survival notification signals including their own terminal numbers “1”, “3”, and “6”, and generate the multicast address GA1 as a destination. The existence notification signal is broadcast (step S292 in FIG. 6).

  The security terminal device 2-1 receives the survival notification signal from the own device and the security terminal devices 2-3 and 2-6, and the terminal numbers “1” and “1” are displayed in the survival terminal list 2231 of the security terminal device 2-1. 3 "and" 6 "are stored (steps S293 to S296 in FIG. 6). Similarly, terminal numbers “1”, “3”, and “6” are also stored in the surviving terminal list 2233 of the guard terminal device 2-3 and the surviving terminal list 2236 of the guard terminal device 2-6, respectively.

  Next, in each guard terminal device 2 included in the terminal group 5-1, a center notification terminal is autonomously determined (step S297 in FIG. 6). In the security terminal device 2-1, the own terminal number “1” is the reference number “1” or more, and the terminal numbers “1”, “3”, and “6” in the surviving terminal list 2231 are all self. Since the terminal number is “1” or more, the above (condition 1) is satisfied. Therefore, the security terminal device 2-1 determines its own device as the center notification terminal. In the security terminal device 2-3, the own terminal number “3” is equal to or greater than the reference number “1”, and is smaller than the own terminal number “3” and equal to or greater than the reference number “1” in the surviving terminal list 2233. 1 ”is included, neither of the above (condition 1) and (condition 2) is satisfied. Therefore, the security terminal device 2-3 does not set its own device as the center notification terminal. In the security terminal device 2-6, the own terminal number “6” is the reference number “1” or more, and is smaller than the own terminal number “6” and the reference number “1” or more in the survival terminal list 2236. 1 ”is included, neither of the above (condition 1) and (condition 2) is satisfied. Therefore, the security terminal device 2-6 does not set its own device as the center notification terminal. As described above, the center notification terminal of the terminal group 5-1 is determined as one of the security terminal devices 2-1.

  The security terminal device 2-1 determined as the center notification terminal transmits its own surviving terminal list 2231 to the security center device 4 (step S299 in FIG. 6). In the terminal information database 421, the security center apparatus 4 includes the item “life and death” of the records 4211, 4213, and 4216 corresponding to the terminal numbers “1”, “3”, and “6” included in the received surviving terminal list, respectively. Is rewritten to “1” (step S475 in FIG. 9).

  FIG. 10B shows the state of communication in the terminal group 5-2 and the contents of the surviving terminal list generated in each guard terminal device 2-2, 2-4, and 2-5.

  Referring to FIG. 10B, among the security terminal devices 2 included in the terminal group 5-2, the security terminal devices 2-2 and 2-5 each receive a response request signal from the security center device 4. However, the security terminal device 2-4 cannot receive a response request signal due to a communication failure. Next, the survival notification signal is exchanged between the guard terminal apparatuses 2-2 and 2-5 that have received the response request signal in the terminal group 5-2.

  The security terminal devices 2-2 and 2-5 that have received the response request signal generate survival notification signals including their own terminal numbers “2” and “5”, respectively, and generate the survival notifications with the multicast address GA2 as the destination. Broadcast signal. In the guard terminal device 2-4 that has not received the response request signal, broadcast transmission processing of the survival notification signal is not performed.

  The guard terminal devices 2-2 and 2-5 receive the survival notification signals broadcasted by the guard terminal devices 2-2 and 2-5, respectively. Terminal numbers “2” and “5” are stored in the surviving terminal list 2232 of the guard terminal device 2-2 and the surviving terminal list 2235 of the guard terminal device 2-5, respectively. The security terminal apparatus 2-4 may receive the survival notification signal broadcasted by the security terminal apparatuses 2-2 and 2-5, but does not perform the communication monitoring process of FIG. Do not write to

  Next, the center notification terminal is autonomously determined in each of the security terminal devices 2-2 and 2-5 included in the terminal group 5-2. In the security terminal device 2-2, the own terminal number “2” is the reference number “1” or more, and the terminal numbers “2” and “5” in the surviving terminal list 2232 are both the own terminal number “2”. Therefore, the above (Condition 1) is satisfied. Therefore, the security terminal device 2-2 determines its own device as the center notification terminal. In the security terminal device 2-5, the own terminal number “5” is equal to or greater than the reference number “1”, and is smaller than the own terminal number “5” and equal to or greater than the reference number “1” in the surviving terminal list 2235. 2 ”is included, neither of the above (Condition 1) and (Condition 2) is satisfied. Therefore, the security terminal device 2-5 does not set its own device as the center notification terminal. In the security terminal device 2-4, the center notification terminal determination process is not performed. As described above, the center notification terminal of the terminal group 5-2 is determined as one of the security terminal devices 2-2.

  The security terminal device 2-2 determined as the center notification terminal transmits the terminal number in its own surviving terminal list 2232 to the security center device 4. In the terminal information database 421, the security center device 4 sets the value of the item “life and death” in the records 4212 and 4225 corresponding to the terminal numbers “2” and “5” included in the received survival terminal list to “1”. Rewrite to Note that the value of the item “life and death” in the record 4214 corresponding to the security terminal device 2-4 in the terminal information database 421 remains unchanged from the initial value “0”.

  Through the above processing, the security center device 4 reaches the time-out of the survival terminal list reception (YES in step S476 in FIG. 9), and searches the terminal information database 421, whereby the value of the life / death state item is “0”. The terminal number “4” of the record 4214 is detected, and the fact that the security terminal device 2-4 is a faulty terminal is displayed on the display unit 45 (steps S477 to S479 in FIG. 9).

  In the example described above with reference to FIG. 10, communication within the terminal group 5-2 with the security terminal devices 2-2 and 2-5 in which no failure has occurred in communication with the security center device 4 and communication. And a security terminal device 2-4 in which a failure has occurred. If there is a communication failure in all the security terminal devices 2 included in one terminal group 5, the number of center notification terminals in the terminal group 5 is zero. In this case, in the terminal information database 421 of the security center device 4, all the values of the life / death status items of the records corresponding to all the security terminal devices 2 included in the terminal group 5 are “0”. Therefore, in the failure terminal detection process (step S477 in FIG. 9) of the security center device 4, all the security terminal devices 2 included in the terminal group 5 are detected as failure terminals.

  Next, referring to FIG. 11, the communication state between all the security terminal devices 2 included in the terminal group 5 and the security center device 4 is normal, but between the security terminal devices 2 in the terminal group 5 A specific example of the communication monitoring process when a failure has occurred in communication will be described.

  FIG. 11 shows that each of the security terminal devices 2-1, 2-3, 2-6 receives a response request signal from the security center device 4 in the same terminal group 5-1 as the specific example described with reference to FIG. When the security terminal device 2-3 cannot receive the survival notification signal from the security terminal device 2-1, even though it has received and broadcasted the survival notification signal including its own terminal number, each security terminal The contents of the surviving terminal list generated by the device 2 are shown.

  In the example of FIG. 11, the security terminal device 2-3 receives the survival notification signal from the own device and the security terminal device 2-6, and generates the survival terminal list 2233 including only the terminal numbers “3” and “6”. Suppose that In this case, in the center notification terminal determination process in the security terminal device 2-3, the own terminal number “3” is the reference number “1” or more, and the terminal numbers “3” and “6” in the surviving terminal list 2233 are displayed. Are both the own terminal number “3” or more, the above (condition 1) is satisfied. Therefore, the security terminal device 2-3 determines its own device as the center notification terminal. As for the security terminal devices 2-1 and 2-6, as in the above example described with reference to FIG. 10A, the security terminal device 2-1 uses its own device as a center notification terminal, and the security terminal device 2-2. 6 does not set its own device as a center notification terminal. Thus, in the terminal group 5-1, the two security terminal devices 2-1 and 2-3 serve as center notification terminals, and transmit the terminal numbers included in the surviving terminal lists 2233 and 2231 to the security center device 4, respectively. Since the surviving terminal list transmitted by the guard terminal device 2-3 includes only the terminal numbers “3” and “6”, the guard center device 4 determines whether or not the guard terminal device has a guard terminal depending on the surviving terminal list from the guard terminal device 2-3. It cannot be understood that the device 2-1 has normally received the response request signal from the security center device 4. However, since the security center device 4 receives the surviving terminal list (including the terminal numbers “1”, “3”, and “6”) from the security terminal device 2-1, it is included in the terminal group 5-1. It can be understood that the communication with each of all the security terminal devices 2-1, 2-3, 2-6 is normal.

  Furthermore, referring to FIG. 10 again, a case where the reference number transmitted from the security center device 4 to each security terminal device 2 is changed from “1” to “4” will be described. Hereinafter, after the generation of the surviving terminal list in each guard terminal device 2 (up to steps S290 to S296 in FIG. 6) is completed by the same process as described above with reference to FIG. The center notification terminal determination process performed will be described.

  In the terminal group 5-1, in the security terminal device 2-1, the own terminal number “1” is less than the reference number “4”, and the surviving terminal list 2231 includes “6” that is greater than or equal to the reference number “4”. Neither of the above (Condition 1) and (Condition 2) is satisfied, and the security terminal device 2-1 is not a center notification terminal. In the security terminal device 2-3, the own terminal number “3” is less than the reference number “4”, and the terminal number “6” greater than or equal to the reference number “4” is included in the terminal numbers of the surviving terminal list 2233. Neither (Condition 1) nor (Condition 2) is satisfied, and the security terminal device 2-3 is not a center notification terminal. In the security terminal device 2-6, the own terminal number “6” is equal to or greater than the reference number “4”, and “1”, “3”, and “6” included in the terminal numbers of the surviving terminal list 2236 are “ Since “1” and “3” are less than the reference number “4” and “6” is equal to or greater than the own terminal number “6”, the above (condition 1) is satisfied. Therefore, the security terminal device 2-6 determines its own device as the center notification terminal. As described above, when the reference number is “4”, the security terminal device 2-6 different from the security terminal device 2-1 that has become the center notification terminal of the terminal group 5-1 when the reference number is “1”. It becomes the center notification terminal of the terminal group 5-1.

  Similarly, for the terminal group 5-2, when the reference number is “4”, a security terminal device 2-5 different from the security terminal device 2-2 that was the center notification terminal when the reference number is “1” is displayed. It becomes a center notification terminal.

  In the processing of the embodiment described above, the center notification terminal determination unit 213 uses a rule that selects the terminal number closest to the reference number in the direction in which the terminal number of the surviving terminal list increases as the terminal number of the center notification terminal. (Step S297 in FIG. 6). In another embodiment, in the circular list illustrated in FIG. 7, the terminal number closest to the forward direction of the list (that is, the direction in which the terminal number decreases) from the reference number with all arrow directions reversed. May be selected as the terminal number of the center notification terminal. In this case, instead of using the above (Condition 1) and (Condition 2), if the following (Condition 3) or (Condition 4) is satisfied, the device is determined to be a center notification terminal, and (Condition 3) and If none of (Condition 4) is satisfied, it may be determined that the device itself is not the center notification terminal.

(Condition 3) The own terminal number is less than or equal to the reference number, and all the terminal numbers in the surviving terminal list are less than or equal to the own terminal number or greater than the reference number.
(Condition 4) The own terminal number is larger than the reference number, and all the terminal numbers in the surviving terminal list are larger than the reference number and less than or equal to the own terminal number.

  In still another example of the rule for determining the center notification terminal, an absolute value of a difference between each of the terminal numbers included in the surviving terminal list and the reference number is obtained, and the terminal number having the smallest obtained absolute value (that is, the terminal number) The terminal number closest to the reference number among the terminal numbers included in the surviving terminal list) may be selected as the terminal number of the center notification terminal.

  In the above embodiment, the security terminal device 2 determines the center notification terminal based on the magnitude relationship between the reference number set by the security center device 4 and each of the terminal numbers included in the surviving terminal list. However, the rule for determining the center notification terminal is not limited to the rule of the embodiment described above. It is sufficient that the security terminal device 2 is selected as an average center notification terminal in the terminal group 5.

  For example, the security center device 4 transmits, to the security terminal device 2 as a reference number, a value that designates the order of terminal numbers (the largest or the smallest) in the surviving terminal list, and the center notification terminal of the security terminal device 2 The determining unit 213 may select the terminal number of the rank represented by the reference number as the terminal number of the center notification terminal in the surviving terminal list. At this time, as shown in the example of FIG. 7, the surviving terminal list is ordered as a circulating list arranged and circulated in ascending order, so that the order can be set regardless of the number of identification numbers in the list.

  In yet another example, the guard terminal device 2 obtains a remainder obtained by dividing the reference number received from the guard center device 4 by the number of terminal numbers included in the surviving terminal list. The security terminal device 2 having the corresponding terminal number may be the center notification terminal. In the case of this example using the remainder of division, the security center device 4 may use, for example, a number incremented (or decreased) by 1 each time as a reference number, or use a randomly selected number as a reference number each time. Good.

  Moreover, in embodiment described above, the response request transmission means 413 of the security center apparatus 4 transmits a response request signal to all the security terminal devices 2 simultaneously. In other embodiments, for example, the response request signal may be transmitted cyclically in units of five terminal groups, or the response request signal may be transmitted cyclically in combination of arbitrary terminal groups.

  In the embodiment described above, the survival notification processing means 212 of the security terminal device 2 performs communication monitoring processing (step S28 in FIG. 5 and FIG. 6) upon receiving a response request signal from the security center device 4. In other embodiments, the security terminal device 2 may periodically perform communication monitoring processing at predetermined time intervals. In this embodiment, for example, the time of starting the communication monitoring process is stored in each storage unit 22 of each security terminal device 2, and the current time acquired from the clock means in each security terminal device 2 is stored in the storage unit 22. If it is set so that the communication monitoring process is performed when the stored time comes, all the security terminal devices 2 belonging to the same terminal group 5 share the survival notification signal in the communication monitoring process at approximately the same time. An information transmission process (step S292 in FIG. 6) is performed.

  According to the embodiment described above, by averaging the frequency with which each security terminal device 2 is selected as the center notification terminal within the terminal group 5, the load of the communication monitoring process in the specific security terminal device 2 can be reduced. Can be reduced. In addition, since the center notification terminal directly communicates with the security center device 4, if the frequency at which each security terminal device 2 is selected as the center notification terminal is averaged, between the security terminal device 2 and the security center device 4 Can directly monitor the communication status. For example, when each of all the security terminal devices 2 is sequentially selected as the center notification terminal, the communication state between each of all the security terminal devices 2 and the security center device 4 can be monitored in order.

  In the embodiment described above, the survival notification signal is transmitted by broadcast transmission using a group address. Therefore, according to the embodiment described above, each guard terminal device 2 only needs to store its own group address, so that the IP addresses of other guard terminal devices 2 in the same terminal group 5 are stored, Compared with a system that transmits a survival notification signal to these IP addresses, the initial setting of each guard terminal device 2 is easy. Further, according to the embodiment described above, even when the security terminal device 2 is added or deleted in the terminal group 5, the IP of the added security terminal device 2 is stored in the storage unit 22 of the other security terminal device 2. There is no need to store the address or delete the deleted IP address of the security terminal device 2 from the storage unit 22.

  Moreover, in the above-mentioned system which memorize | stores the IP address of the other guard terminal device 2 contained in the same terminal group 5 in each guard terminal device 2, for example, when addition or deletion of the guard terminal device 2 is performed In addition, the IP addresses of other security terminal devices 2 stored in each security terminal device 2 are updated by transmitting and receiving and exchanging each other's IP addresses between the security terminal devices 2 included in the same terminal group 5. It is possible. In this case, if a communication failure has occurred in one of the security terminal devices 2 when exchanging each other's IP addresses for the purpose of updating the IP address, the security terminal device 2 in which the communication failure has occurred The IP address stored by itself cannot be updated, and the other security terminal device 2 cannot acquire the IP address of the security terminal device 2 in which the communication failure has occurred. In such a case, it is considered that inconsistency occurs in the subsequent survival notification process. However, according to the embodiment described above, when the security terminal device 2 is added or deleted, there is no need to exchange IP addresses between the security terminal devices 2, and thus such inconsistency does not occur.

It is a block diagram which shows the example of a structure of a security system. In one embodiment of this invention, it is a block diagram which shows the example of a structure of a security terminal device. In one embodiment of this invention, it is a block diagram which shows the example of a structure of a security center apparatus. In one Embodiment of this invention, it is a figure which shows the example of the data content of the terminal information database with which a security center apparatus is provided. It is a flowchart which shows the example of the procedure of the process performed by the security terminal device in one embodiment of this invention. In one Embodiment of this invention, it is a flowchart which shows the example of the partial procedure of the process performed with a security terminal device. In one Embodiment of this invention, it is a figure for demonstrating the center notification terminal determination process which a security terminal device performs. It is a flowchart which shows the example of the procedure of the process performed in the security center apparatus in one Embodiment of this invention. In one Embodiment of this invention, it is a flowchart which shows the example of the partial procedure of the process performed in a security center apparatus. In one Embodiment of this invention, it is a figure which shows the example of the survival terminal list | wrist produced | generated by each guard terminal device. In one Embodiment of this invention, it is a figure which shows the other example of the survival terminal list | wrist produced | generated by each guard terminal device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Security system, 2 Security terminal device, 3 Internet, 4 Security center apparatus, 5 Terminal group, 6 Sensor, 21,41 Control part, 22,42 Storage part, 23 Sensor LAN interface, 24,44 LAN interface, 43 Input part 45 Display unit 211 Registration application means 212 Life notification processing means 213 Center notification terminal determination means 214 Center notification means 215 Alarm transmission means 411 Terminal registration means 412 Reference number determination means 413 Response request transmission means 414 Faulty terminal detection means, 415 alarm processing means, 421 terminal information database.

Claims (6)

A network monitoring system for detecting a terminal device in which a center device and a plurality of terminal devices previously divided into groups are communicably connected via a network and communication is disabled,
The terminal device
During a predetermined time that is common within the group to which the own device belongs, a survival notification signal including the identification code assigned to the own device is broadcast to all terminal devices belonging to the group, and the survival A survival confirmation means for receiving a notification signal and generating a survival terminal list which is a list of the identification codes included in the received survival notification signal;
Notification terminal determination means for determining that the own apparatus is a notification terminal to the center apparatus on the condition that at least the identification code of the own apparatus is included in the survival notification signal received by the survival confirmation means;
When the own device is determined as the notification terminal, a center notification means for transmitting the surviving terminal list to the center device, and
The center device is
A terminal information database that pre-registers the identification codes assigned to all the terminal devices;
The survival terminal list received from the terminal device is compared with the terminal information database, and an identification code that is registered in the terminal information database but is not included in the survival terminal list is detected and detected. Faulty terminal detection means for outputting the terminal device corresponding to the identification code as communication impossible,
A network monitoring system comprising: The network monitoring system according to claim 1,
The identification code employs a code having a predetermined order with the identification codes of other terminal devices in the group,
The notification terminal determination means selects an identification code having a rank determined in common within the group from the received identification codes, and if the selected identification code matches the identification code of its own device. A network monitoring system that determines that a device is a notification terminal for the center device. The network monitoring system according to claim 2,
The center device further includes:
A rank determining means for determining a rank determined in common within the group within a range not exceeding the order of identification codes registered in the terminal information database;
Rank transmission means for transmitting the rank determined by the rank determination means to all the terminal devices in the group;
Network monitoring system with The network monitoring system according to claim 2,
The center device further includes:
A reference number determining means for determining a reference number as a reference for the order in the predetermined order within a range not exceeding the order of the identification codes registered in the terminal information database;
Reference number transmitting means for transmitting the reference number determined by the reference number determining means to all terminal devices in the group, and
The notification terminal determining means selects an identification code that is closest to the reference number received from the center apparatus from the received identification codes, and if the selected identification code matches the identification code of the own apparatus, A network monitoring system that determines a notification terminal to the center device. The network monitoring system according to any one of claims 1 to 4,
The center device further includes response request transmission means for transmitting a response request signal for requesting a response to all the terminal devices in the group,
The survival confirmation unit is a network monitoring system that broadcasts the survival notification signal during the predetermined time before and after receiving the response request signal from the center device. A terminal device that is communicably connected to a center device via a network and is divided into groups in advance,
During a predetermined time that is common within the group to which the own device belongs, a survival notification signal including the identification code assigned to the own device is broadcast to all terminal devices belonging to the group, and the survival A survival confirmation means for receiving a notification signal and generating a survival terminal list which is a list of the identification codes included in the received survival notification signal;
Notification terminal determination means for determining that the own apparatus is a notification terminal to the center apparatus if the identification code of the own apparatus is included in at least the survival notification signal received by the survival confirmation means;
When the own device is determined as the notification terminal, a center notification means for transmitting the surviving terminal list to the center device;
A terminal device comprising:

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