Data communication path establishment system and method

Abstract

To provide a system and method for establishing a data communication path that eliminates the hassle of a user having to manage connection information and perform connection tasks when there are multiple ICT device candidates with which a mobile terminal can communicate, enables the user to quickly connect to the desired ICT device, and easily provides the user with the functions they desire.SOLUTION: A mobile terminal 3 includes a communication control unit 31 that accesses a management database 4 by specifying a user and obtains information linked to the organization to which a user belongs from the database, and a display unit 34 that presents to the user identification information and functions of construction machinery (vehicle 1) that the user can use and connectable control units 10 on the basis of the obtained information, and when the user selects the presented construction machinery and the control unit, a data communication path between the mobile terminal and the control unit is established using the connection information of the control unit.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a data communication path establishment system and method between an ICT device mounted on a vehicle and a mobile terminal.

Background Art

[0002] In construction work using construction machinery, various ICT devices are being installed for the purposes of improving safety, labor saving, and reducing life cycle costs. For example, there are a surrounding monitoring system that can photograph and record the images around the vehicle with a camera and review the working conditions later, and a progress management system that can manage the progress of work by recording the positions where the vehicle has worked and visualizing them on a map. As user interfaces for these ICT devices, the use of general-purpose mobile terminals represented by smartphones is increasing. That is, a path for data communication (mainly wireless communication such as wireless LAN) is established (hereinafter, also simply referred to as "connection") between the in-vehicle ICT device and the mobile terminal, and instructions from the user (such as an operator of construction machinery, a site manager, or a surrounding worker) are sent to the ICT device by operating the screen on the mobile terminal, or the mobile terminal receives information from the ICT device, processes it into a form that the user can understand, and displays it on the screen.

[0003] When establishing a data communication path, it is common to perform authentication for communication for the purpose of ensuring security. Also, since general-purpose communication terminals are used, it is common to use general-purpose methods for the authentication technology itself. That is, authentication is performed using a connection target specified by unique identification information for each ICT device such as an SSID (Service Set Indentifier) and an authentication key such as a connection password (hereinafter, the combination of unique identification information and an authentication key is referred to as "connection information").

[0004] While it was common for ICT devices to be installed one per purpose (function), in recent years, it has become increasingly common for a single ICT device to perform multiple functions. In particular, there are product lines that achieve diverse purposes by partially changing the software installed on the ICT device. In such product lines, the communication functions between the ICT device and the communication terminal are standardized, making it difficult to identify which device is performing which purpose based solely on the unique identification information included in the connection information. Therefore, if a single construction machine is equipped with multiple ICT devices with different purposes, when a user tries to connect their mobile terminal to an ICT device that performs a specific purpose, they need to select the target from multiple connection information candidates based on their memory. Furthermore, in construction sites where construction machines are in operation, users often handle multiple machines, and the number of candidate ICT devices to connect to increases proportionally to the number of construction machines. This makes managing connection information extremely complicated, and simplifying the management of connection information between mobile terminals and ICT devices has become a challenge.

[0005] To address these challenges, for example, Patent Document 1 discloses a technology that simplifies the user's work related to authentication between a mobile terminal and an in-vehicle device. This technology involves a database that associates the identification information of a mobile terminal used by a user with the identification information of an in-vehicle device authorized to communicate with that mobile terminal. After the user has made the mobile terminal ready to communicate with the in-vehicle device and the database, they launch a predetermined software. The mobile terminal then sends its own identification information and the identification information of the in-vehicle device with the database. The database then checks whether the received mobile terminal identification information and the in-vehicle device identification information are associated. If it determines that they are associated, it outputs an authorization key to the mobile terminal that allows data communication, and the mobile terminal and the in-vehicle device begin data communication. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 5890291 [Overview of the project] [Problems that the invention aims to solve]

[0007] According to the technology described in Patent Document 1, the amount of connection information between the mobile terminal and the in-vehicle equipment that the user needs to manage is reduced, and the connection can be established quickly. However, this technology includes a step of enabling communication between the mobile terminal and the in-vehicle equipment in advance, but the details of this process are not mentioned. Furthermore, the case where there are multiple candidate in-vehicle equipment devices that can communicate is not mentioned.

[0008] This invention was made in response to the circumstances of the prior art described above, and its purpose is to eliminate the complexity of managing connection information and connection work by the user when there are multiple candidate ICT devices that the mobile terminal can communicate with in a system composed of ICT devices with a mobile terminal as the user interface, and to enable quick connection to the target ICT device and easy provision of desired functions to the user. [Means for solving the problem]

[0009] To solve the above problems, a data communication establishment system according to one embodiment of the present invention comprises a group of control units installed in a construction machine, each having multiple control units that realize predetermined functions by running different software on the controller according to the purpose; a mobile terminal capable of data communication with each of the multiple control units; and a database that registers at least the user, the organization to which the user belongs, the construction machine owned by the organization, and the identification information, functions, and connection information necessary for data communication between the control unit and the mobile terminal of the control unit installed in the construction machine. The mobile terminal has a communication control unit that, by specifying the user in the database and accessing it, obtains information linked to the organization to which the user belongs from the database; and a display unit that presents to the user the identification information and functions of the construction machine and connectable control unit that the user can use based on the obtained information. When the user selects the presented construction machine and control unit, a data communication path is established between the mobile terminal and the control unit using the connection information of the control unit. [Effects of the Invention]

[0010] According to the present invention, when there are multiple candidates for ICT devices that a mobile terminal can communicate with, it becomes possible to eliminate the complexity of managing connection information and connection work by the user, quickly connect to the target ICT device, and easily provide the user with the desired functions. Further features relating to the present invention will become apparent from the description herein and the accompanying drawings. Problems, configurations, and effects other than those described above will be revealed by the following description of embodiments. [Brief explanation of the drawing]

[0011] [Figure 1] A block diagram showing the overall configuration of a system according to one embodiment of the present invention. [Figure 2] A diagram showing an example of company information registered in the system's database. [Figure 3] A diagram showing an example of user information registered in the system's database. [Figure 4] A diagram showing an example of vehicle information registered in the system's database. [Figure 5] This diagram shows an example of ICT device information registered in the system's database. [Figure 6] A flowchart illustrating the process performed when registering a user in the management database. [Figure 7] A flowchart illustrating the process performed when registering an ICT device in the management database. [Figure 8] A diagram illustrating the login process for an application running on a device. [Figure 9] A diagram illustrating the process of running an application on a device. [Modes for carrying out the invention]

[0012] The following describes embodiments of the present invention based on the drawings. (System Configuration) Figure 1 is a block diagram showing the overall configuration of a system according to one embodiment of the present invention. The route establishment system according to one embodiment includes a plurality of ICT devices 2, one set for each purpose (function) mounted on a vehicle 1 such as construction machinery, a mobile terminal 3 owned by the user, and a management database 4. Vehicle 1 is denoted as vehicle 1a, 1b, etc. to distinguish between different vehicles. ICT devices 2 are denoted as ICT device 2a, 2b, etc. to distinguish between different ICT devices.

[0013] (Configuration of ICT devices) The ICT device 2 has a control unit 10 and a sensor unit 14 having a wireless LAN function. The control unit 10 has a communication control unit 11, a data storage unit 12, and an information processing unit 13. The communication control unit 11 authenticates the connection between the mobile terminal 3 and the ICT device 2. When the communication control unit 11 succeeds in authentication, it further controls the data exchange with the mobile terminal 3 and stores the received data in the data storage unit 12. The information processing unit 13 appropriately processes the data collected by the sensor unit 14 according to the purpose and stores the result in the data storage unit 12. In this embodiment, the minimum configuration of the ICT device 2 is described, but there may be multiple sensor units, an actuator unit or a display unit acting on the outside of the ICT device may be attached, or the control unit 10 may include a sensor unit, an actuator unit, or a display unit.

[0014] (Configuration of Mobile Terminal) The mobile terminal 3 has at least a communication control unit 31 having a wireless LAN function, a data storage unit 32, an information processing unit 33, a display unit 34, and an input unit 35. The communication control unit 31 controls the communication with the ICT device 2 and the management database 4, and controls the data exchange between the management database 4, the ICT device 2, and the data storage unit 32. The information processing unit 33 appropriately processes the data stored in the data storage unit 32 according to the purpose and displays the processing result on the display unit 34. Also, the information processing unit 33 appropriately processes the input signal from the input unit 35 and stores it in the data storage unit 32. In this embodiment, the minimum configuration of the mobile terminal 3 is described, but it is not limited to this. Also, a connection application described later operates on the mobile terminal 3.

[0015] (Configuration of Management Database) The management database 4 includes a communication control unit 41, a data storage unit 42, and an information processing unit 43. The communication control unit 41 authenticates a connection request from the mobile terminal 3, and if the authentication is successful, controls the data exchange between the mobile terminal 3 and the data storage unit 42. The information processing unit 43 appropriately processes the data stored in the data storage unit 42 and stores the processing result in the data storage unit 42. The content and storage method of the data stored in the data storage unit 42 will be described later. Also, the communication control unit 41 authenticates a connection request from an external processing device such as a personal computer (not shown), and if the authentication is successful, controls the data exchange between the mobile terminal 3 and the data storage unit 42. Note that in this embodiment, the minimum configuration of the management database 4 is described, but it is not limited thereto. For example, the management database 4 may include an input unit and a display unit.

[0016] (Contents of the stored data in the management database) The content of the data stored in the data storage unit 42 of the management database 4 described above will be explained. In the management database 4, user information, information about the group (company) to which the user belongs, vehicle information owned by the company, ICT device information mounted on the vehicle, the functions of the ICT device and the connection information to the ICT device are stored.

[0017] Figs. 2 to 5 are charts showing specific registration examples of the above information. Specifically, Fig. 2 shows a registration example of company information, in which a unique ID (company ID) and a company name are registered for each company. Fig. 3 shows a registration example of user information, in which a unique ID (user ID), a user name, the company ID of the company to which the user belongs, and an authentication password for the user to access the management database are registered.

[0018] Figure 4 shows an example of vehicle information registration, where each vehicle has a unique ID (vehicle ID), information that can uniquely identify the vehicle (vehicle identification number), the company ID of the company to which the vehicle belongs, and the model name of the vehicle. Figure 5 shows an example of ICT device information registration, where each ICT device has a unique ID (device ID), information that can uniquely identify the ICT device (individual identification number), the vehicle ID of the vehicle in which the ICT device is installed, the functions of the ICT device, and connection information (SSID and connection password) for connecting to the ICT device.

[0019] (Method for saving data to the management database) Next, we will explain how to save the various types of information mentioned above. In principle, the administrator of the management database is responsible for saving data to the management database (hereinafter, saving data will also be referred to as "registration"). First, we will explain the registration of user information to the management database (user registration) using the flowchart in Figure 6. Initially, a user who wishes to register contacts the administrator with their username, company name, company address, etc. (S01). The administrator accesses the management database using a terminal such as a PC, checks the information received from the user, and confirms whether the combination of username and company name received is already registered (S02). If the received information is already registered, the administrator does not register the received information and notifies the user that it is already registered, and the registration process is completed (S03, S05). If the received information is not registered (Yes in S03), the administrator further checks whether the company name included in the received information is also not registered (S04). If the company name is not registered (Yes in S06), the administrator registers the company name linked to the company ID (S07).

[0020] Subsequently, the administrator further associates the username, company ID, and temporary connection password and registers them (S08). Once registration is complete, the administrator notifies the user of the registration completion and provides the user ID and temporary connection password (S09). Upon receiving the registration completion notification, the user accesses the management database using the user ID and temporary connection password (S10). The management database displays a connection password registration screen to the user and registers the information entered by the user as that user's connection password (S11, S12, S13). User registration to the management database is completed in this manner.

[0021] Next, the registration of ICT device information in the management database will be explained using the flowchart in Figure 7. Users who wish to register an ICT device contact the administrator with the individual identification number of the ICT device, the vehicle identification number and model name of the vehicle in which the ICT device is installed, the function name of the ICT device, and connection information to the ICT device (SSID, connection password) (S21, see Figure 5). The administrator checks whether the combination of the received individual identification number of the ICT device and the vehicle's vehicle identification number is already registered (S22). If the number combination is already registered, the administrator notifies the user that it is already registered and completes the registration process (S22, S23, S25).

[0022] If the received number combination is unregistered (Yes in S23), the administrator further checks whether the vehicle identification number of the received vehicle is also unregistered (S24). If the number is unregistered (Yes in S26), the administrator links the vehicle identification number, vehicle ID, and model name and registers them (S27). After that, the administrator links the ICT device, vehicle ID, and the functions and connection information of that ICT device and registers them (S28). Once the registration is complete, the administrator notifies the user that the registration is complete (S29). In this way, the registration of the ICT device to the management database is completed.

[0023] (Mobile terminal connection app) Next, we will explain, using Figures 8 and 9, the connection application that runs on the mobile terminal 3 and is used by the user to connect to the desired ICT device based on the registration information described above.

[0024] First, when the user launches the connection application, the login screen 100 is displayed as shown in Figure 8(a). On the login screen, the user enters their user ID and connection password into the user ID input field 101 and the connection password input field 102, respectively, and presses the login button 103. The entered user ID and connection password are sent to the management database 4 along with an access request signal via the communication control unit 31 of the mobile terminal 3. When the management database 4 receives the access request signal, it verifies whether the received username and connection password are already registered.

[0025] If the entered information does not match the registered information, the management database 4 sends an authentication failure signal to the mobile terminal 3. Upon receiving the authentication failure signal, the mobile terminal 3 displays an authentication failure screen 110 to the user, as shown in Figure 8(b). If the user presses the retry button 111, it returns to the login screen 100 shown in Figure 8(a).

[0026] If the information entered on the login screen in Figure 8(a) matches the registered information, the management database 4 extracts the username associated with that user ID (see Figure 3). It also refers to the company ID associated with the user ID and extracts the company name (see Figure 2). Furthermore, it refers to the vehicle ID associated with that company ID and extracts the vehicle identification number and model name (see Figure 4). Finally, it extracts the individual identification number, function, and connection information of the ICT device associated with that vehicle ID (see Figure 5). The management database 4 then sends the extracted username, company name, vehicle identification number and model name, and ICT device individual identification number, function, and connection information to the mobile terminal 3 in a format that preserves their respective relationships, along with a signal indicating successful authentication.

[0027] When the mobile terminal 3 receives a signal indicating successful authentication from the management database 4, it displays the vehicle selection screen 120 shown in Figure 9(a) to the user. The company name and user name received from the management database 4 are displayed in the user information field 121 of the vehicle selection screen 120. In addition, the vehicle selection field 122 of the vehicle selection screen 120 displays a list of vehicle identification numbers received from the management database 4. The user can select only one vehicle from the list, and once the user has selected a vehicle, the mobile terminal 3 displays the device selection screen 130 shown in Figure 9(b) to the user.

[0028] On the device selection screen 130, the company name and user name received from the management database 4 are displayed in the user information field 121, and the vehicle identification number selected on the vehicle selection screen 120 is displayed in the vehicle selection field 122. In addition, the device selection field 131 displays a list of the individual identification numbers and functions of the ICT devices associated with the vehicle identification number selected on the vehicle selection screen 120. The user can select only one ICT device from the list, and once the user selects one device, the mobile terminal 3 displays the start-up confirmation screen 140 shown in Figure 9(c).

[0029] On the Start Confirmation Screen 140, the company name and user name received from the management database 4 are displayed in the user information field 121, the vehicle identification number selected on the vehicle selection screen 120 is displayed in the vehicle selection field 122, and the individual identification number and function of the ICT device selected on the device selection screen 130 are displayed in the device selection field 131. When the user presses the Start Button 141, the connection application compares the detected SSID with the SSID of the ICT device selected on the device selection screen via the communication control unit 31 of the mobile terminal 3.

[0030] If the SSID corresponding to the selected SSID cannot be found due to registration errors, communication problems, etc., the mobile terminal 3 displays the connection failure screen 150 shown in Figure 9(d) to the user. If the user presses the restart button 151, the start-up confirmation screen 140 shown in Figure 9(c) is displayed again.

[0031] If an SSID matching the selected SSID is found, the mobile terminal 3 sends a connection request signal along with the connection password to the ICT device 2 that has the corresponding SSID. Upon receiving the connection request signal, the communication control unit 21 of the ICT device 2 verifies the connection password.

[0032] If password verification fails, ICT device 2 sends an authentication failure signal to mobile terminal 3. Upon receiving the authentication failure signal, mobile terminal 3 displays the connection failure screen 150 shown in Figure 9(d) to the user. If the user presses the restart button 151, the start-up confirmation screen 140 shown in Figure 9(c) is displayed.

[0033] If the password verification is successful, ICT device 2 sends an authentication success signal to mobile terminal 3. Upon receiving the authentication success signal, mobile terminal 3 displays a screen that allows the user to use the functions of the ICT device selected on the device selection screen, initiates data communication with ICT device 2, and displays a user interface that enables the use of the functions of ICT device 2 to the user. Further details are omitted in this embodiment.

[0034] Furthermore, when the user presses the vehicle selection field 122 on the device selection screen 130 or the usage confirmation screen 140, the mobile terminal 3 displays the vehicle selection screen 120. Also, when the user presses the device selection field 131 on the usage confirmation screen 140, the mobile terminal 3 displays the device selection screen 130. In addition, when the user presses the logout button 152 on the vehicle selection screen 120, device selection screen 130, usage confirmation screen 140, or connection failure screen 150, the mobile terminal 3 displays the login screen 100. In this way, it is also possible to transition from one screen to any other screen.

[0035] (Effects of the example) According to the embodiment described above, when using a desired ICT device, the user only needs to manage their own user information, and even if the number of vehicles they ride in and the ICT devices they use increases, they do not need to manage connection information, making management easy. Furthermore, after entering their user information on a mobile terminal, the user can quickly and easily use the desired function by simply selecting the vehicle identification number of the vehicle they are riding in and the function they wish to use from the displayed information.

[0036] (Variation 1) The following describes some variations. In the above embodiment, wireless LAN was used as the method of communication between the mobile terminal 3 and the ICT device 2, but other communication methods that perform authentication using unique identification information and a connection password may also be used. For example, when communicating via wired LAN, after connecting the mobile terminal and the ICT device with a LAN cable, data communication may be started after performing authentication using unique identification information and a connection password.

[0037] (Modification 2) Furthermore, in the above embodiment, the method of registering connection information to the ICT device 2 in the management database 4 was described by the administrator of the management database 4, but it is also possible to allow users to change it. For example, when a user who is already registered in the management database 4 accesses the management database 4 from a PC or the like, a screen that allows them to change the connection information can be displayed. In this case, it is desirable that the management database 4 stores the connection information before and after the change, and after the mobile terminal 3 connects to the ICT device 2 with the connection information before the change received from the management database 4, it applies the changed connection information to the ICT device and automatically registers the changed connection information to the ICT device 2, but it is also possible to manually apply the changed connection information to the ICT device 2.

[0038] Alternatively, after connecting to ICT device 2 using a connection application running on mobile device 3, a screen for changing the connection information with that ICT device may be displayed within the connection application, allowing the user to change the connection information. In this case, after successfully changing the connection information with ICT device 2, the connection application also sends a request to change the connection information to the management database 4. When the management database 4 receives a request to change the connection information from the mobile device 3, which has successfully connected, it updates the registered information stored in the management database 4.

[0039] (Variation 3) Furthermore, although the above embodiment described a method in which a user requests the administrator of the management database 4 to register a vehicle equipped with an ICT device in the management database 4, it is also possible to link with other vehicle management databases that manage equipment installed in vehicles and register in the management database 4 without involving the user. In this case, the company that sells and maintains the vehicles would link the vehicles and the devices installed in them in the vehicle management database.

[0040] (Modification 4) Furthermore, in addition to the above embodiment, the ICT device 2 may have multiple connection information, and the content of the data exchanged between the ICT device 2 and the connection application may be switched depending on the connection information used by the connection application to connect with the ICT device. For example, if the ICT device 2 has connection information for general users and connection information for administrator users, and the connection application connects to the ICT device using the general user connection information, the data within the ICT device can be viewed but not modified, and if the connection application connects to the ICT device using the administrator user connection information, the data within the ICT device can be viewed and modified. The management database 4 then assigns information to the registered user ID, indicating whether it is a "general user" or an "administrator," and returns either the general user connection information or the administrator user connection information to the mobile terminal 3 depending on the user ID used when the user accesses the management database 4 via the connection application. In other words, the user has several permission information, and the connection application sends connection information corresponding to that permission information to the user's mobile terminal.

[0041] In this way, general users who can perform assigned tasks simply by using the data on the ICT device can concentrate on their work without worrying about accidentally deleting data, and users who need to modify the data on the ICT device can do so as before. Furthermore, for example, if someone in the company who handles user management only notifies workers of either a "general user" or an "administrator" user ID, users can perform their assigned roles without having to be aware of whether they are a "general user" or an "administrator," thus contributing to improved overall system security without increasing the complexity of connecting to ICT devices.

[0042] (Variation 5) Furthermore, in the above embodiment, we described a configuration in which the user belongs to a company and is linked to all vehicles owned by that company so that they can be used. However, it is also possible to link each user to vehicles that are available for use within the company.

[0043] (Experimental variation 6) In the above embodiment, the process of registering data to the management database 4 was described, but it is also possible to delete data in response to a request from a user.

[0044] (Example 7) Furthermore, although the above embodiments targeted multiple ICT devices having the same configuration, the present invention can be applied to any device having the same function, even if its configuration differs, as long as it does not depart from the spirit of the present invention.

[0045] The embodiments of the present invention described above provide the following effects. (1) The data communication path establishment system according to the present invention comprises a group of control units installed on a construction machine, each having multiple control units that realize predetermined functions by running different software on the controller according to the purpose, a mobile terminal capable of data communication with each of the multiple control units, and a database that registers at least the user, the organization to which the user belongs, the construction machine owned by the organization, and the identification information, functions, and connection information necessary for data communication between the control unit and the mobile terminal of the control unit installed on the construction machine. The mobile terminal has a communication control unit that, by specifying the user in the database and accessing it, obtains information from the database that is linked to the organization to which the user belongs, and a display unit that presents to the user the identification information and functions of the construction machine and connectable control unit that the user can use based on the obtained information. When the user selects the presented construction machine and control unit, the mobile terminal establishes a data communication path between the mobile terminal and the control unit using the connection information of the control unit.

[0046] With the above configuration, when there are multiple potential ICT devices that a mobile terminal can communicate with, it eliminates the complexity of managing connection information and connection procedures for the user, allowing for quick connection to the target ICT device and easily providing the user with the desired functions.

[0047] (2) The control unit has an information processing unit that changes the range of data that the user can access according to the connection information, and the user has authorization information, and the connection information of the control unit differs according to that authorization information. This makes it possible to prevent unauthorized access by users who do not have authorization information.

[0048] (3) Connection information can be changed from a mobile device.

[0049] (4) Furthermore, the data path establishment method according to the present invention also produces the same effects as the systems described in (1) to (3) above.

[0050] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible. For example, the embodiments described above are explained in detail to make the present invention easier to understand, and the present invention is not necessarily limited to embodiments having all the configurations described. Furthermore, it is possible to replace parts of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add configurations from other embodiments to the configuration of one embodiment. Furthermore, it is possible to delete parts of the configuration of each embodiment, or to add or replace other configurations. [Explanation of symbols]

[0051] 1. Vehicle (construction machinery), 2. ICT device (controller), 3. Mobile terminal, 4. Management database, 13. Information processing unit, 31. Communication control unit, 34. Display unit

Claims

1. A group of control units installed in construction machinery, having multiple control units that perform predetermined functions by running different software on the controller according to the purpose, A portable terminal capable of data communication with each of the aforementioned multiple control units, A database that registers at least the user, the organization to which the user belongs, the construction machinery owned by the organization, and the identification information, functions, and connection information necessary for data communication between the control unit and the mobile terminal of the control unit, It has, The mobile terminal includes a communication control unit that, by specifying a user in the database, obtains information from the database that is linked to the organization to which the user belongs, and a display unit that, based on the obtained information, presents the user with identification information and functions of the construction machinery and the control unit that can be connected to the user. When the user selects the construction machine and the control unit presented, a data communication path is established between the mobile terminal and the control unit using the connection information of the control unit. A data communication path establishment system characterized by the following:

2. A data communication path establishment system according to claim 1, The control unit has an information processing unit that changes the range of data accessible to the user according to the connection information, The user possesses authorization information, and the connection information of the control unit differs according to this authorization information. A data communication path establishment system characterized by the following features.

3. A data communication path establishment system according to claim 1, The aforementioned connection information can be changed from the mobile device. A data communication path establishment system characterized by the following features.

4. A group of control units installed in construction machinery, having multiple control units that perform predetermined functions by running different software on the controller according to the purpose, A portable terminal capable of data communication with each of the aforementioned multiple control units, A database that registers at least the user, the organization to which the user belongs, the construction machinery owned by the organization, and the identification information, functions, and connection information necessary for data communication between the control unit and the previous mobile terminal, A method for establishing a data communication path using a data communication path establishment system having, By using the aforementioned mobile terminal to access the database by specifying a user, information linked to the organization to which the user belongs is obtained from the database, and based on the obtained information, identification information and functions of the construction machinery and the control unit that can be connected to the user are presented to the user. When the user selects the construction machine and the control unit presented, a data communication path is established between the mobile terminal and the control unit using the connection information of the control unit. A method for establishing a data communication path characterized by the following.

5. A method for establishing a data communication path according to claim 4, The control unit changes the range of data that the user can access according to the connection information. The user possesses authorization information, and the connection information of the control unit differs according to this authorization information. A method for establishing a data communication path, characterized by the features described herein.

6. A method for establishing a data communication path according to claim 4, The aforementioned connection information can be changed from the mobile device. A method for establishing a data communication path, characterized by the features described herein.

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