JP3978059B2 - Communication system and communication terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication system and a communication terminal.
[0002]
[Prior art]
In recent years, in order to be able to remotely monitor the presence or absence of abnormalities detected by various detectors and the measured values of various detectors, a data terminal equipped with various detectors and a management server provided on the monitoring side There has been proposed a communication system that performs bidirectional data communication through a communication network. By using this type of communication system, for example, a gas meter in a consumer is used as a data terminal, and a management server capable of data communication with the data terminal through a communication network is provided, and the meter reading value of the gas meter is collected in the management server. It is also considered to manage the presence or absence of abnormalities that occurred in
[0003]
Now consider a communication system in which a management server manages meter reading and the presence / absence of an abnormality in a gas meter. In this type of communication system, as shown in FIG. 3, a communication terminal 2 is inserted between the gas meter 1 and the communication network NW in order to connect the gas meter 1 as a data terminal to a communication network NW such as the Internet. The In addition, a management server 3 installed in a management center which is a place different from the gas meter 1 is connected to the communication network NW. Further, in order to connect a plurality of communication terminals 2 to the communication network NW, a repeater 4 having a router function is interposed between the communication terminal 2 and the communication network NW. Although it is assumed that the repeater 4 in the illustrated example includes the DHCP server 5, the DHCP server 5 may be provided separately as shown by a one-dot chain line in the figure. When the DHCP server 5 performs data communication between the communication terminal 2 and the management server 3 through the communication network NW, an address temporarily used by the communication terminal 2 in the communication network NW (hereinafter referred to as “temporary address”) is temporarily stored. A unique address (hereinafter referred to as a “real address”) used by the communication terminal 2 in the communication network NW is obtained by lending to the communication terminal 2 and performing data communication between the communication terminal 2 and the management server 3 using the temporary address. It is acquired from the management server 3. This type of configuration is particularly effective in a usage pattern in which a large number of gas meters 1 are installed in one building, such as an apartment house, and the gas meter 1 and the communication terminal 2 are provided for each consumer. The repeater 4 is used in such a form that it is provided for each building.
[0004]
Here, in order to perform data communication between the communication terminal 2 and the management server 3 via the communication network NW, it is necessary to use a network address uniquely used in the communication network NW. In order to identify them individually, a network address must be set for each communication terminal 2. However, since the network address is generally given in order for each device connected to the communication network NW from the organization or trader that manages the communication network NW, it is difficult to systematically manage the network address in the management server 3. is there. Therefore, in the illustrated example, a plurality of network addresses used uniquely in the communication network NW are held in the management server 3 in advance, and the network addresses held by the management server 3 are assigned to each communication terminal 2 as the main addresses. The structure which does is adopted.
[0005]
Hereinafter, the operation of the configuration shown in FIG. 3 will be briefly described. Here, it is assumed that one gas meter 1 is connected to each communication terminal 2 and a unique terminal ID is set to each gas meter 1. As shown in FIG. 4, when power is turned on, the communication terminal 2 first performs data communication with the gas meter 1 in order to obtain the terminal ID of the gas meter 1. The communication terminal 2 is turned on, for example, when the gas meter 1 is newly installed, when the gas meter 1 is replaced, or when the existing gas meter 1 is started to be used. The communication procedure in data communication performed by the communication terminal 2 with the gas meter 1 is unique from the communication procedure in data communication performed by the communication terminal 2 with the management server 3 through the communication network NW. When the power is turned on, the communication terminal 2 requests the gas meter 1 to transfer the terminal ID (P1). In response to this request, the gas meter 1 returns the terminal ID to the communication terminal 2 (P2). When the communication terminal 2 confirms the return of the terminal ID from the gas meter 1 in response to the request for the terminal ID, an end message is returned to the gas meter 1 (P3), and the process of acquiring the terminal ID in the communication terminal 2 is completed. Is notified to the gas meter 1.
[0006]
When the terminal ID of the gas meter 1 is acquired, the communication terminal 2 requests the DHCP server 5 to issue a temporary address used in the communication network NW in order to enable data communication with the management server 3 (P4). The DHCP server 5 can temporarily lend an address that can be used in the communication network NW to the communication terminal 2 as a temporary address, and the communication terminal 2 that has acquired the temporary address can communicate with the management server 3 by using the temporary address. It becomes possible to communicate through the communication network NW. Accordingly, when the DHCP server 5 requests the issuance of a temporary address from the communication terminal 2, the DHCP server 5 issues a temporary address to the communication terminal 2 and causes the communication terminal 2 to acquire the temporary address (P5).
[0007]
Since the communication terminal 2 that has acquired the temporary address can perform data communication with the management server 3 using the temporary address, the communication terminal 2 is turned on to notify the management server 3 of the terminal ID of the gas meter 1. Initial registration communication which is the first data communication with the management server 3 immediately after that is executed. Further, in the initial registration communication, the communication terminal 2 not only notifies the management server 3 of the terminal ID, but the management server 3 gives this address to the communication terminal 2. However, this address held by the management server 3 is not set arbitrarily by the management server 3, but is actually given by an organization or a trader that manages the communication network NW. After the initial registration communication is completed, the communication terminal 2 can directly perform data communication with the management server 3 using this address.
[0008]
The initial registration communication will be described in more detail. In the initial registration communication, the communication terminal 2 performs data communication with the management server 3 using the temporary address acquired from the DHCP server 5, and first notifies the management server 3 of the terminal ID (P6). When the management server 3 receives the terminal ID, the management server 3 issues a main address to the communication terminal 2 that is a transmission source of the terminal ID, and transmits the issued main address together with the received terminal ID to the communication terminal 2 (P7). However, since the communication terminal 2 does not have the real address at this time, the management server 3 transfers the real address and the terminal ID to the communication terminal 2 using the temporary address that has notified the terminal ID. At this time, the communication terminal 2 acquires the real address, but in order to confirm that the acquired real address is correct, the communication terminal 2 communicates with the management server 3 again using the temporary address, and receives the real address received from the management server 3. And the terminal ID are returned to the management server 3 (P8). In the management server 3, if the main address and the terminal ID sent to the communication network NW match the main address and the terminal ID received from the communication terminal 2, it is determined that the association between the main address and the terminal ID is successful. The end message is notified to the communication terminal 2 using the temporary address (P9). With this end message, the communication terminal 2 ends the use of the temporary address, and the DHCP server 5 ends the lending of the temporary address. However, there are cases where temporary address lending is limited by time with a time limit. Although not described in the above-described example, the communication terminal 2 may have a unique communication terminal ID, and not only the terminal ID but also the communication terminal ID may be transmitted to the management server 3 for acquiring this address. is there.
[0009]
By the way, when the management server 3 issues this address, the customer is specified by at least one of the terminal ID and the communication terminal ID. That is, the management server 3 includes a database in which at least one of the terminal ID and the communication terminal ID is associated with the consumer, and the terminal ID / communication terminal ID and the customer are included in the database even when the gas meter 1 is newly installed or replaced. Are registered in association with each other. Therefore, when the communication terminal 2 notifies the management server 3 of the terminal ID / communication terminal ID using the temporary address, the terminal ID / communication terminal ID is collated with the database to identify the consumer, and the terminal ID / communication The address issued in association with the terminal ID is registered in the database in association with the customer.
[0010]
[Problems to be solved by the invention]
By the way, as described above, the communication terminal 2 obtains a temporary address from the DHCP server 5 every time the power is turned on, and executes the initial registration communication using the temporary address with the management server 3 to obtain this address. If the communication terminal 2 is operating with the commercial power supply as the power source, the initial registration communication is executed even when the power is restored after a power failure. Thus, when power is restored from a power failure, it is considered that a plurality of communication terminals 2 perform initial registration communication all at once, so there is a possibility that traffic in the communication network NW increases rapidly and the communication speed of the communication network NW decreases. is there.
[0011]
In addition, when the gas meter 1 is newly installed, the gas meter 1 and the communication terminal 2 are newly installed, and when the gas meter 1 is replaced, the gas meter 1 is changed. Therefore, although the initial registration communication with the management server 3 is required, the existing gas meter 1 is installed at the consumer. In the case of starting the use of the gas meter 1, that is, in the case of opening the gas meter 1 that has been closed after the use of the previous user in the consumer, the initial registration communication is performed because the gas meter 1 and the communication terminal 2 are not changed. In spite of being unnecessary, since the initial registration communication is executed, this causes unnecessary traffic in the communication network NW. Moreover, since the communication terminal 2 performs data communication with the management server 3 and the DHCP server 5 in the initial registration process, power consumption at the communication terminal 2 increases.
[0012]
The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide a communication system and a communication terminal in which an increase in traffic in a communication network is suppressed and power consumption is relatively reduced.
[0013]
[Means for Solving the Problems]
The invention of claim 1 is interposed between a data terminal that generates transmission data and has a unique terminal ID and a management server that acquires transmission data from the data terminal via a communication network. A communication terminal that transmits transmission data to a management server, a communication terminal address storage unit that stores a unique communication terminal address used in a communication network, and a non-volatile storage that stores a terminal ID obtained by data communication with the data terminal Terminal ID storage unit, a non-volatile flag indicating execution / non-execution of initial registration communication for registering the terminal ID in the management server immediately after power-on, and a terminal ID and a terminal ID obtained from the data terminal immediately after power-on A comparison unit that determines a match / mismatch with the terminal ID stored in the storage unit, and a case where the determination of the comparison unit does not match immediately after power-on A communication control unit that executes initial registration communication when the comparison unit determination is coincident and the flag is not executed, and when the comparison unit decision is coincident and the flag is already executed, a communication control unit that does not execute the initial registration communication It is characterized by providing.
[0014]
According to a second aspect of the present invention, in the first aspect of the invention, the communication network is the Internet, a DHCP is connected to the communication network, and the communication terminal is temporarily acquired from a DHCP server for execution of initial registration communication. A unique book address issued by the management server is acquired by performing data communication with the management server using a temporary address, and the book address is used as the communication terminal address after completion of initial registration communication. To do.
[0015]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the management server includes a database in which the terminal ID set in the data terminal is registered, and is transmitted from the communication terminal in the initial registration communication. When the terminal ID of the data terminal to be processed is registered in the database, the communication terminal address is registered in the database in association with the terminal ID.
[0016]
According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the data terminal is selected from a gas meter, a water meter, and a watt hour meter, and a measured value is used as the transmission data.
[0017]
According to a fifth aspect of the present invention, in the first to third aspects of the invention, the data terminal is selected from a gas leak alarm device, a fire detector, and a security sensor, and abnormality detection is used as the transmission data. And
[0018]
The invention of claim 6 is interposed between a data terminal that generates transmission data and has a unique terminal ID and a management server that acquires transmission data from the data terminal via a communication network. A communication terminal that transmits transmission data to a management server, a communication terminal address storage unit that stores a unique communication terminal address used in a communication network, and a non-volatile storage that stores a terminal ID obtained by data communication with the data terminal Terminal ID storage unit, a non-volatile flag indicating execution / non-execution of initial registration communication for registering the terminal ID in the management server immediately after power-on, and a terminal ID and a terminal ID obtained from the data terminal immediately after power-on A comparison unit that determines a match / mismatch with the terminal ID stored in the storage unit, and a case where the determination of the comparison unit does not match immediately after power-on A communication control unit that executes initial registration communication when the comparison unit determination is coincident and the flag is not executed, and when the comparison unit decision is coincident and the flag is already executed, a communication control unit that does not execute the initial registration communication It is characterized by providing.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
In the embodiment described below, the gas meter 1 is exemplified as the data terminal. However, the data terminal is not limited to the gas meter 1, in addition to a metered value such as a water meter or an electricity meter (electric meter), The technical idea of the present invention can be applied to detecting abnormalities such as a gas leak alarm, a fire detector, and a security sensor. That is, the transmission data generated by the data terminal is a measurement value or an abnormality detection.
[0020]
The basic form of this embodiment is the same as that of the conventional configuration shown in FIG. 3, in which the gas meter 1 is connected to the communication terminal 2, and the communication terminal 2 is connected to the management server 3 via the communication network NW such as the Internet. It becomes a connected form. In addition, a DHCP server 5 that lends a temporary address for the communication terminal 2 to perform data communication with the management server 3 through the communication network NW is also provided. In the illustrated example, the repeater 4 having the router function includes the DHCP server 5 as in the conventional configuration, but the DHCP server 5 may be provided separately from the repeater 4 as indicated by a one-dot chain line in the figure.
[0021]
The communication terminal 2 used in this embodiment has the configuration shown in FIG. Since the communication terminal 2 is interposed between the gas meter 1 and the communication network NW, the communication terminal 2 includes a terminal connection interface 11 for connecting the gas meter 1 and a network connection interface 12 for connecting the communication network NW. The communication terminal 2 is provided with a nonvolatile memory 13 such as an EEPROM. The memory 13 includes a terminal ID storage unit 13a and a communication terminal ID storage unit 13b that store a terminal ID for identifying the gas meter 1 as data to be given to the management server 3 and a communication terminal ID for identifying the communication terminal 2, respectively. Provided. Further, in order to perform data communication with the management server 3, a server address storage unit 13c that stores the address of the management server 3 and a communication that stores an address in the communication network NW related to the communication terminal 2 as a communication terminal address. A terminal address storage unit 13 d is provided in the memory 13. Note that the contents of the communication terminal ID storage unit 13b and the server address storage unit 13c are registered in advance. The address of the communication terminal 2 stored in the communication terminal address storage unit 13d is acquired from the management server 3 by executing the initial registration communication as in the conventional configuration. However, in the present embodiment, a flag 13e is provided for identifying whether or not the communication terminal 2 has executed the initial registration communication in the past (that is, whether or not the initial registration communication has already been executed). A communication control unit 10 is provided between the terminal connection interface 11 and the network connection interface 12 to control data communication between the gas meter 1 and the management server 3 with reference to data stored in the memory 13. The communication control unit 10 includes a microcomputer as a main component.
[0022]
In the initial registration communication of the present embodiment, when the communication terminal 2 performs a process of acquiring this address with the management server 3 using the temporary address, the communication terminal 2 sends the terminal ID / communication terminal ID to the management server 3. 4 until the management server 3 notifies the end of the message (P6 to P9 in FIG. 4), and if the end of the message is not notified within the time limit, the communication terminal 2 sends to the management server 3 To retransmit the terminal ID / communication terminal ID. However, if the notification of the end of the message cannot be confirmed even if the preset number of retransmissions is performed, the communication terminal 2 considers that something is abnormal and notifies the communication terminal 2 by notifying means (not shown).
[0023]
By the way, the communication control part 10 in this embodiment acquires terminal ID from the gas meter 1 immediately after the power supply of the communication terminal 2 is turned on similarly to the conventional structure. However, the communication control part 10 of this embodiment is provided with the comparison means 10a which compares terminal ID acquired from the gas meter 1 with terminal ID registered into the terminal ID memory | storage part 13a. When the comparison unit 10a determines that the terminal ID acquired from the gas meter 1 and the terminal ID stored in the terminal ID storage unit 13a do not match (when the terminal ID is not stored in the terminal ID storage unit 13a) The communication control unit 10 stores the terminal ID acquired from the gas meter 1 in the terminal ID storage unit 13a of the memory 13 and executes the above-described initial registration communication with the management server 3 through the network connection interface 12. To do. In the initial registration communication, as in the conventional configuration, a temporary address is acquired from the DHCP server 5, and initial registration communication for performing data communication with the management server 3 using the temporary address is executed to acquire the main address. After the completion of the initial registration communication, the communication control unit 10 stores the main address acquired from the management server 3 in the communication terminal address storage unit 13d and sets the flag 13e to the content indicating that the initial registration communication has ended. Waits for normal data communication. Here, normal data communication refers to data communication having notification contents rather than mere address registration, such as when reading the meter of the gas meter 1 or when the gas meter 1 notifies the management server 3 of an abnormality. Means.
[0024]
On the other hand, when the comparison unit 10a determines that the terminal ID acquired from the gas meter 1 matches the terminal ID stored in the terminal ID storage unit 13a, the communication control unit 10 checks the content of the flag 13e. When the flag 13e indicates that the initial registration communication is already executed (executed), the initial registration communication is not performed, and the process waits until normal data communication with the management server 3 is performed. On the other hand, when the initial registration communication is not executed by the flag 13e, the initial registration communication is executed with the management server 3, and the initial registration communication is performed after the initial registration communication is completed. Is set to a content indicating that has ended, and waits until normal data communication is performed.
[0025]
The operations described above for the communication terminal 2 are simply summarized as shown in FIG. That is, when the power is turned on (S1), first, the terminal ID is acquired from the gas meter 1 via the terminal connection interface 11 (S2), and the acquired terminal ID is compared with the contents of the terminal ID storage unit 13a (S3). Here, when the two match, the contents of the flag 13e are confirmed (S4). When the flag 13e indicates that the initial registration communication has been executed in the past (already executed), the terminal ID has already been registered in the management server 3, so that it waits for normal data communication (S5).
[0026]
On the other hand, even when the terminal ID acquired from the gas meter 1 matches the terminal ID stored in the terminal ID storage unit 13a, the flag 13e indicates that the initial registration communication has not been executed in the past (not executed). Sometimes the initial registration communication is executed (S6), and after the initial registration communication is successful, the content indicating that the initial registration communication has ended is set in the flag 13e (S7), and the system waits until normal data communication is performed (S7). S5).
[0027]
If the terminal ID acquired from the gas meter 1 does not match the terminal ID stored in the terminal ID storage unit 13a, the acquired terminal ID is stored in the terminal ID storage unit 13a (S8), and initial registration communication is executed. (S6). After the initial registration communication is successful, the flag 13e is set to the content indicating that the initial registration communication is completed, and the process waits until normal data communication is performed (S5).
[0028]
As in the conventional configuration shown in FIG. 3, the gas meter 1 is connected to the communication terminal 2, and the communication terminal 2 is connected to the communication network NW capable of data communication with the management server 3 via the relay 4 including the DHCP server 5. Consider a connected communication system. When the communication terminal 2 described in the present embodiment is used, after the process (P1 to P3) in which the communication terminal 2 acquires the terminal ID from the gas meter 1 in the procedure shown in FIG. Steps S3 and S4 of the processing shown in FIG. 2 are performed between 5 and the processing (P4 and P5) for acquiring the temporary address. Step S7 is added after the initial registration communication is completed. In short, compared with the conventional configuration, the processing of steps S3, S4, and S7 shown in FIG. 2 is added. Therefore, the communication terminal 2 does not perform data communication with the management server 3 and the DHCP server 5 every time the power is turned on, but the terminal ID obtained from the gas meter 1 is stored in the memory 13 immediately after the power is turned on. If the initial registration communication has been executed in the past, the data communication between the management server 3 and the DHCP server 5 is not performed, and the communication network NW is compared with the conventional configuration. As well as power consumption at the communication terminal 2 can be reduced.
[0029]
For example, assuming that the gas meter 1 is newly installed or replaced, the contents of the terminal ID storage unit 13a are different from the terminal ID of the connected gas meter 1 immediately after the communication terminal 2 is turned on. The terminal ID acquired from 1 is stored in the terminal ID storage unit 13a, and the initial registration communication is executed to register the terminal ID in the management server 3.
[0030]
Further, assuming that the communication terminal 2 is restored from a power failure, the communication terminal 2 obtains the terminal ID from the gas meter 1 because the communication terminal 2 is turned on when the power is restored. Since the memory 13 of the communication terminal 2 is non-volatile, there is no change in the terminal ID and the flag 13e stored before and after the power failure, so the terminal ID acquired from the gas meter 1 is stored in the memory 13. Matches the terminal ID. The flag 13e also indicates that the initial registration communication has been executed in the past, so the initial registration communication is not performed with the management server 3, and as a result, the communication network NW at the time of power recovery from a power failure There is no increase in traffic and power consumption at the communication terminal 2 is reduced.
[0031]
Note that the communication network NW between the communication terminal 2 and the management server 3 may be wired or wireless. Therefore, the communication network NW is not limited to the Internet, and for example, a public line network can be used. However, if the public line network is used, the DHCP server 5 is not necessary, so the process of acquiring this address in the initial registration communication is unnecessary, and only the process of registering the terminal ID / communication terminal ID in the management server 3. become. Moreover, although the power supply of the communication terminal 2 was demonstrated as a commercial power supply in embodiment mentioned above, the frequency | count of data communication between the management servers 3 can be reduced, and the power consumption in the communication terminal 2 can be reduced. Therefore, the technical idea of the present invention can be applied even when the communication terminal 2 is a battery power source.
[0032]
【The invention's effect】
Each invention of Claims 1-6 provides the comparison part which compares terminal ID acquired from the data terminal with terminal ID stored in the non-volatile terminal ID memory | storage part, and already performed / not performed initial registration communication A non-volatile flag is provided to indicate that the judgment of the comparison unit is the same immediately after the power is turned on, and the initial registration communication with the management server is not performed when the flag content is already executed. There is an advantage that traffic due to the initial registration communication does not occur in the communication network at the time of power transmission, resulting in a reduction in power consumption of the communication terminal. In addition, even when multiple communication terminals are connected to the communication network, traffic due to the communication terminal does not occur in the communication network when power is restored from a power failure. .
[0033]
Furthermore, in the invention of claim 2, the Internet is used for the communication network and a DHCP server is provided, and at the time of initial registration communication, a temporary temporary address is given to the communication terminal by the DHCP server, When data communication is enabled and the management server issues a real address to the communication terminal by initial registration communication, the communication terminal uses the real address issued by the management server as a unique communication terminal address to communicate with the management server. Thus, the management server issues a communication terminal address used by the communication terminal, thereby facilitating management of the communication terminal address by the management server.
[0034]
Further, in the invention of claim 3, when the terminal ID is registered in the database provided in the management server, the communication terminal address of the communication terminal is registered in the database in association with the terminal ID. Even if the correspondence between the communication terminal address and the user or installation location of the communication terminal is unknown, if the correspondence between the terminal ID and the user or installation location of the data terminal is registered in the database, the data terminal Can be associated with a communication terminal address, and management of the communication terminal is facilitated.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is an operation explanatory view of the above.
FIG. 3 is a schematic diagram of a communication system.
FIG. 4 is an operation explanatory diagram of a communication system.
[Explanation of symbols]
1 Gas meter
2 Communication terminal
3 Management server
4 repeaters
5 DHCP server
10 Communication control unit
10a comparison part
13a Terminal ID storage unit
13d communication terminal address storage unit
13e flag
NW communication network

Claims (6)

A data terminal that generates transmission data and has a unique terminal ID, a management server that acquires transmission data from the data terminal via a communication network, and a data terminal that is interposed between the data terminal and the management server. A communication terminal that transmits the transmission data to the management server, wherein the communication terminal stores a unique communication terminal address used in the communication network and data communication between the data terminal and the data terminal. A non-volatile terminal ID storage unit for storing the acquired terminal ID, a non-volatile flag indicating whether or not initial registration communication for registering the terminal ID in the management server immediately after power-on is performed, and immediately after power-on A comparison unit for determining whether the terminal ID acquired from the data terminal matches the terminal ID stored in the terminal ID storage unit, and the power is turned on Later, when the comparison unit decision does not match and when the comparison unit decision matches and the flag is not executed, initial registration communication is executed, and when the comparison unit decision matches and the flag is already executed And a communication control unit that does not execute the initial registration communication. The communication network is the Internet, a DHCP server is connected to the communication network, and the communication terminal performs data communication with the management server using a temporary address temporarily acquired from the DHCP server for execution of initial registration communication. 2. The communication system according to claim 1, wherein a unique main address issued by the management server is acquired by performing the step, and the initial address is used as the communication terminal address after completion of the initial registration communication. The management server includes a database in which the terminal ID set in the data terminal is registered, and when the terminal ID of the data terminal transmitted from the communication terminal in the initial registration communication is registered in the database, 3. The communication system according to claim 1, wherein the communication terminal address is registered in the database in association with the terminal ID. The communication system according to any one of claims 1 to 3, wherein the data terminal is selected from a gas meter, a water meter, and a watt hour meter, and a measured value is used as the transmission data. 4. The communication according to claim 1, wherein the data terminal is selected from a gas leak alarm device, a fire detector, and a security sensor, and abnormality detection is used as the transmission data. 5. system. Transmission data from the data terminal is transmitted to the management server, which is interposed between the data terminal that generates the transmission data and a unique terminal ID and the management server that acquires the transmission data from the data terminal via the communication network A communication terminal address storage unit for storing a unique communication terminal address used in the communication network, a non-volatile terminal ID storage unit for storing a terminal ID obtained by data communication with the data terminal, A non-volatile flag indicating whether or not the initial registration communication for registering the terminal ID in the management server immediately after the power is turned on is stored in the non-volatile flag, the terminal ID obtained from the data terminal immediately after the power is turned on, and the terminal ID storage unit. The comparison unit that determines whether the terminal ID matches / disagrees with the case where the comparison unit does not match immediately after the power is turned on. A communication control unit that executes initial registration communication when the flag is not executed, and does not execute initial registration communication when the comparison unit matches and the flag is already executed. Communication terminal.

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