JP2003087319A - Communication data transmission system, communication data transmission method, and communication device and communication program used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit communication data among a plurality of communication devices in real time at a low cost via the existing Internet. SOLUTION: After a session is set up between a center server 14 and a field terminal 36 or the like, the field terminal 36 or the like outputs a transmission request of the communication data to the center server 14. Thus, even when a firewall router 32 exists, the center server 14 transmits the communication data to the field terminals 36 or the like in real time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication data transmitting system for transmitting and receiving commands and data as communication data between a plurality of communication devices, a communication data transmitting method, and a communication device and a communication program used therefor. is there.

[0002]

2. Description of the Related Art In recent years, as a system for transmitting communication data, the so-called Internet in which a plurality of networks are mutually connected to construct a large-scale communication network has been widely used.

Since a large number of people share a communication network on the Internet, the communication cost can be greatly reduced as compared with the case where each person constructs a communication network independently according to his or her purpose.

[0004]

However, even such an Internet has the following problems.

When a company or individual connects their intranet to the Internet, just as the company or individual can access resources on the Internet, the external company or individual also has resources for that company or individual. Can be accessed. for that reason,
Companies, individuals, and even so-called providers that provide Internet connection services, build firewalls with routers used to connect the Internet and intranets to limit or prohibit access from the Internet side to their resources. Become.

Therefore, for example, a fixed global IP is provided on an intranet connected to the Internet.
(Internet Protocol) Even if a field terminal that is assigned an address and controls an actuator is connected, and a client terminal on the Internet sends a request to send communication data to the field terminal, this request passes through the router. Therefore, the field terminal cannot be controlled from the client terminal on the Internet.

On the other hand, in order to make this control possible, communication data for the control must be able to pass through the router, and the security of the intranet is sacrificed.

[0008] As a result, conventionally, a dedicated line or a virtual dedicated line is used for transmitting communication data to such a field terminal without using the Internet (without passing through a router). This is very costly and time consuming.

As another method, each field terminal periodically outputs a communication data transmission request to a server on the Internet, and the server transmits the communication data to the field terminal in response to the request. Can also be considered.

However, in the communication data transmission method using such polling, when communication data is generated on the server side, there is a time lag between the time when the data is generated and the time when the communication data is actually transmitted. Will occur. This time lag is the maximum period for requesting transmission of communication data, and it is necessary to shorten this period in order to pursue real-time communication data transmission. Then, the shorter the transmission cycle of the communication data transmission request, the more frequently the communication data transmission request is generated. Considering the communication speed of the network, the processing capacity of the server, etc., it is not realistic to make the cycle short enough to ensure real-time control of the field terminal.

These problems are caused by, for example, nationwide F
This is especially serious when trying to build an AX transmission service or the like.

[0012] The present invention has been made to solve the above-described problems, and communication that enables inexpensive transmission of communication data between a plurality of communication devices in real time via the existing Internet. Data transmission system,
An object of the present invention is to obtain a communication data transmitting method, a communication device and a communication program used for the method.

[0013]

A communication data transmission system according to the present invention is a communication data transmission system for transmitting communication data from a transmission source communication device to a transmission destination communication device, wherein the transmission destination communication device is , A session establishment request is transmitted to the transmission source communication device to establish a session with the transmission source communication device, and then a transmission request for communication data is transmitted to the transmission source communication device. , Does not respond to a transmission request for communication data until communication data to be transmitted to the communication device of the transmission destination is generated.

With this configuration, the communication device of the transmission source responds to the transmission request of the communication data received in advance when the communication data is generated, and immediately transmits the communication data to the communication device of the transmission destination. You can Therefore, as in the case where the destination communication device acquires the communication data stored in the source communication device by polling,
There is no time lag from the generation of communication data to the acquisition by the communication device of the transmission destination of the communication data. That is, communication data can be transmitted in real time from the source communication device to the destination communication device.

Further, with such a configuration, a session is established between the transmission source communication device and the transmission destination communication device, and communication data is transmitted from the transmission destination communication device to the transmission source communication device. Since the generation of communication data is awaited while the request is output, the following effects are also obtained.

First, even if the communication device of the transmission source is arranged on the Internet side of the firewall and the communication device of the transmission destination is arranged on the intranet side of the firewall, the transmission device of the transmission source is Even if the communication device and the destination communication device are connected to different intranets connected to the Internet, communication data can be transmitted from the source communication device to the destination communication device. As a result, it is possible to transmit communication data in real time to the destination communication device while ensuring the security of the destination communication device.

Secondly, even when the destination communication device is dialing up to the Internet via the Internet connection provider, that is, the fixed IP address or the like is fixed to the destination communication device. Even in the case where the communication data is not allocated, the communication data can be transmitted from the communication device of the transmission source to the communication device of the transmission destination. As a result, it is possible to inexpensively transmit communication data to a communication device of a transmission destination without having to make a contract for a constant connection service or a contract for a fixed IP address with an Internet connection provider or a carrier.

Thirdly, in addition to the above advantages,
In general, a communication device arranged on the intranet side of the firewall can freely transmit communication data to the communication device on the internet side. Therefore, the communication device of the transmission source and the communication device of the transmission destination are connected to the internet. Real-time two-way communication of communication data is possible at low cost regardless of the connection environment.

The communication data transmission system according to the present invention is
A communication data transmission system for transmitting communication data from a transmission source communication device to a plurality of transmission destination communication devices, wherein each transmission destination communication device transmits a session establishment request to the transmission source communication device. After establishing a session with another communication device, the communication device sending a communication data transmission request to the communication device of the transmission source, and the communication device of the transmission source sends a communication list of the communication devices of the transmission destination with which the session has been established or the communication. Create a list of destination communication devices that are receiving data transmission requests, and if there is communication data to be sent to one of the destination communication devices, use the list to communicate the destination A device is specified, and the communication data is transmitted in response to a transmission request for the communication data from the destination communication device.

According to this structure, the communication device of the transmission source is
When communication data is generated, the destination communication device to respond to is specified based on the list, responds to the communication data transmission request of the destination communication device, and immediately transmits the communication data to the destination communication device. Can be sent. That is, unlike the case of transmitting communication data by polling or the like, the communication data generated in the communication device of the transmission source can be transmitted in real time to the communication device of the transmission destination without causing a time lag.

Further, with such a configuration, a session is established between the transmission source communication device and each transmission destination communication device, and communication data is transmitted from each transmission destination communication device to the transmission source communication device. The output of the transmission request is waited for the generation of communication data. Therefore, even if the communication device of the transmission source is arranged on the Internet side of the firewall and the communication device of the transmission destination is arranged on the Intranet side of the firewall, the communication device of the transmission source is transmitted via the Internet. Communication data can be transmitted in real time from the destination to the destination communication device. As a result, real-time two-way communication of communication data is inexpensively performed using the Internet without securing the IP address to the communication device of the transmission destination while securing the security of the communication device of the transmission destination with the firewall. Is possible.

The communication data transmission system according to the present invention is
The communication device of each transmission destination transmits identification information for distinguishing the communication device of the transmission destination from the communication devices of other transmission destinations prior to the transmission of the transmission request of the communication data immediately after the session is established, The transmission source communication device uses the identification information of each transmission destination communication device to generate a list of the transmission destination communication devices that have received the communication data transmission request.

If this configuration is adopted, a list can be generated when a session is established, and the list can be used for a plurality of times in that session to specify the destination communication device. As a result, it is possible to further simplify the process from the generation of communication data to the transmission of the communication data in the communication device that is the transmission source, and it is possible to further improve the real-time property of the transmission timing of the transmission data.

The communication data transmission system according to the present invention is
The transmission destination communication device periodically transmits a start notification to the transmission source communication device after transmitting the communication data transmission request, and the transmission source communication device does not receive the start notification. The above communication device is deleted from the list.

By adopting this configuration, the communication device of the transmission source can prevent the communication data from being transmitted to the communication device of the transmission destination which is not actually in the activated state.

The communication data transmission system according to the present invention is
The destination communication device, after receiving a response to the transmission request of the communication data from the source communication device,
A request for transmitting new communication data is transmitted to the communication device of the transmission source.

With this configuration, the communication device at the transmission source is in a state of accepting the transmission request for the communication data from the communication device at the transmission destination, and can always transmit the communication data.

The communication data transmission system according to the present invention comprises:
When the communication data to be transmitted to the communication device of the transmission source is generated, the communication device of the transmission destination transmits the communication data to be transmitted to the communication device of the transmission source regardless of whether or not a transmission request for the communication data is transmitted. It is something to send.

By adopting this configuration, the communication device of the transmission destination and the communication device of the transmission source can communicate the communication data bidirectionally and in real time.

A communication data transmitting method according to the present invention is a communication data transmitting method for transmitting communication data from a communication device of a transmission source to a communication device of a transmission destination, and the communication device of the transmission destination and the communication device of the transmission source. After establishing a session between them, the destination communication device sends a communication data transmission request to the source communication device, and the source communication device transmits the communication data to the destination communication device. It does not respond to the transmission request of communication data until the occurrence of.

According to this method, the source communication device is
When the communication data is generated, the communication data can be immediately transmitted to the destination communication device by responding to the previously received communication data transmission request. That is, unlike the case of transmitting communication data by polling or the like, the communication data generated in the communication device of the transmission source can be transmitted in real time to the communication device of the transmission destination without causing a time lag.

Moreover, according to such a method, a session is established between the transmission source communication device and the transmission destination communication device, and communication data is transmitted from the transmission destination communication device to the transmission source communication device. It waits for the generation of communication data while outputting the request. Therefore, even if the communication device of the transmission source is arranged on the Internet side of the firewall and the communication device of the transmission destination is arranged on the Intranet side of the firewall, the communication device of the transmission source is transmitted via the Internet. Communication data can be transmitted in real time from the destination to the destination communication device. As a result, while the security of the communication device of the transmission destination is ensured by the firewall, I
Without assigning a fixed P address,
Real-time two-way communication of communication data is possible at low cost using the Internet.

A communication data transmitting method according to the present invention is a communication data transmitting method for transmitting communication data from a communication device of a transmission source to a communication device of a plurality of transmission destinations. After establishing a session with the communication device, a transmission request for communication data is transmitted to the communication device of the transmission source, and the communication device of the transmission source is a list of the communication devices of the transmission destination which has established the session or the communication data. Create a list of destination communication devices that are receiving the transmission request, and if there is communication data to be transmitted to any of the destination communication devices, the destination communication device is based on the list. Is specified, and the communication data is transmitted in response to the transmission request of the communication data from the communication device of the transmission destination.

According to this method, the source communication device
When communication data is generated, the destination communication device to respond to is specified based on the list, responds to the communication data transmission request of the destination communication device, and immediately transmits the communication data to the destination communication device. Can be sent. That is, unlike the case of transmitting communication data by polling or the like, the communication data generated in the communication device of the transmission source can be transmitted in real time to the communication device of the transmission destination without causing a time lag.

Further, according to such a method, a session is established between the transmission source communication device and each transmission destination communication device, and communication data is transmitted from each transmission destination communication device to the transmission source communication device. The output of the transmission request is waited for the generation of communication data. Therefore, even if the communication device of the transmission source is arranged on the Internet side of the firewall and the communication device of the transmission destination is arranged on the Intranet side of the firewall, the communication device of the transmission source is transmitted via the Internet. Communication data can be transmitted in real time from the destination to the destination communication device. As a result, real-time two-way communication of communication data is inexpensively performed using the Internet without securing the IP address to the communication device of the transmission destination while securing the security of the communication device of the transmission destination with the firewall. Is possible.

In the communication data transmitting method according to the present invention, each of the communication devices of the transmission destinations sets the communication device of the transmission destination to the other transmission destination before transmitting the transmission request of the communication data immediately after the session is established. Transmitting the identification information for distinguishing from the communication device, the communication device of the transmission source uses the identification information of the communication device of each transmission destination to identify the communication device of the transmission destination that receives the transmission request of the communication data. I am trying to generate a list.

By adopting this method, it is possible to generate a list when a session is established, and to specify the destination communication device using this list for a plurality of times in the session. As a result, it is possible to further simplify the process from the generation of communication data to the transmission of the communication data in the communication device that is the transmission source, and it is possible to further improve the real-time property of the transmission timing of the transmission data.

In the communication data transmitting method according to the present invention, each of the destination communication devices periodically transmits a start notification to the source communication device after transmitting the communication data transmission request.
The transmission source communication device deletes the transmission destination communication device that has not received the activation notification from the list.

By adopting this method, it is possible to prevent the communication device of the transmission source from transmitting the communication data to the communication device of the transmission destination which is not actually in the activated state.

In the communication data transmitting method according to the present invention, the communication device of the transmission destination receives a response to the transmission request of the communication data from the communication device of the transmission source, and then sends the response to the communication device of the transmission source. A request for transmitting various communication data is transmitted.

By adopting this method, the communication device of the transmission source is in a state of accepting the transmission request of the communication data from the communication device of the transmission destination, and can always transmit the communication data.

In the communication data transmitting method according to the present invention, the communication device of the transmission destination receives the communication data to be transmitted to the communication device of the transmission source regardless of whether or not the transmission request of the communication data is transmitted. The communication data to be transmitted is transmitted to the transmission source communication device.

If this method is adopted, the communication device of the transmission destination and the communication device of the transmission source can communicate the communication data bidirectionally and in real time.

The communication device according to the present invention comprises a communication member for communicating with another communication device, and a control means for transmitting / receiving communication data to / from the other communication device using the communication member. In the communication device, the control means establishes a session with the other communication device, and then, when the communication member receives a communication data transmission request from the other communication device, the communication data to be transmitted to the other communication device. It does not respond to the transmission request of the communication data until the occurrence of.

If this communication device is used as the communication device of the transmission source of the communication data, when the communication data of the transmission source is generated, the communication device responds to the transmission request of the communication data received in advance and immediately transmits the communication data. Can be transmitted to another communication device, and communication data can be transmitted in real time, unlike when polling or the like is used.

Moreover, if such a communication device is used as a communication device which is a transmission source of communication data, a session is established between the communication device and another communication device and a communication data transmission request from another communication device is established. Will wait for the generation of communication data. Therefore, even if the source communication device is installed on the Internet side of the firewall and another communication device is installed on the intranet side of the firewall, the communication device Communication data can be transmitted in real time to another communication device. As a result, real-time two-way communication of communication data is possible inexpensively using the Internet without securing IP addresses to other communication devices while securing security of other communication devices with a firewall. Becomes

In the communication device according to the present invention, the control means receives the communication data transmission request by using the identification information from the other communication device received by the communication member, and is the destination communication device. Is generated, and when the communication member no longer receives the activation notification from the other communication device, the other communication device is deleted from the list.

If this configuration is adopted, another communication device can be specified any number of times using this list. As a result, it is possible to further simplify the processing from the generation of communication data to the transmission of the communication data in another communication device, and it is possible to further improve the real-time property of the transmission timing of the transmission data.

The communication device according to the present invention comprises a communication member for communicating with another communication device, and a control means for transmitting / receiving communication data to / from the other communication device using the communication member. In the communication device, the control means causes the communication member to transmit a session establishment request to another communication device to establish a session with the other communication device, and then causes the communication member to communicate with the other communication device. A communication data transmission request is transmitted, and after the communication member receives a response to the communication data transmission request, the communication member transmits a new communication data transmission request to another communication device.

If this communication device is used as a communication device to which communication data is transmitted, it means that a communication data transmission request is always output to another communication device, and the communication data is transmitted to the other communication device. If it occurs, it can be received immediately. Therefore, unlike the case where polling or the like is used, communication data can be transmitted in real time.

Moreover, if such a communication device is used as a communication device to which communication data is transmitted, a session is established between the communication device and the other communication device and communication data is constantly transmitted to the other communication device. It waits for the generation of communication data with the transmission request output. Therefore,
Even if the communication device of the transmission source is arranged on the Internet side of the firewall and another communication device is arranged on the intranet side of the firewall, the communication device of the transmission source may be replaced by another communication device via the Internet. Communication data can be transmitted to the communication device in real time. As a result, while ensuring the security of other communication devices with the firewall, the IP address can be applied to other communication devices.
Real-time two-way communication of communication data can be performed inexpensively using the Internet without allocating fixed addresses.

In the communication device according to the present invention, the control means uniquely determines the communication device from the communication member to the other communication device prior to transmitting the first transmission request for communication data after the session is established. The assigned identification information is transmitted.

By adopting this configuration, it is possible to generate a list when a session is established and specify the communication device using this list for a plurality of times in the session. As a result, it is possible to further simplify the processing from the generation of communication data to the transmission of the communication data in another communication device, and it is possible to further improve the real-time property of the transmission timing of the transmission data.

In the communication device according to the present invention, the control means periodically transmits an activation notification from the communication member to the other communication device after transmitting the first transmission request of communication data after the session is established. It is what makes me.

By adopting this configuration, the other communication device can recognize the communication device that is the transmission destination that is not actually in the activated state, and thus suppresses the transmission of communication data to the communication device. can do.

In the communication device according to the present invention, when the communication data to be transmitted from the communication member to the other communication device is generated, the control means is irrespective of whether or not a transmission request for the communication data is transmitted. The communication member transmits the communication data to be transmitted to the other communication device.

If this configuration is adopted, communication data can be communicated bidirectionally and in real time with other communication devices.

The communication program according to the present invention is stored in a computer having a communication member for communicating with a communication device,
The communication member generates a list including the communication device in response to the identification information received from the communication device, and the communication data to be transmitted to the communication device is received after receiving the communication data transmission request from the communication device in the communication member. When it occurs, the communication device is selected from the list to cause the communication member to transmit the response to the communication data transmission request and to realize the control means for transmitting the communication data.

If the communication device having this communication program installed is used as the communication device of the transmission source of the communication data, when communication data is generated in the communication device of the transmission source, it responds to the transmission request of the communication data received in advance. The communication data can be immediately transmitted to another communication device, and the communication data can be transmitted in real time, unlike when polling or the like is used.

Moreover, if such a communication device is used as a communication device as a transmission source of communication data, a session is established between the communication device and the communication device (hereinafter referred to as other communication device in this paragraph). , In the state of receiving a communication data transmission request from another communication device, the generation of communication data is awaited. Therefore, even if the source communication device is installed on the Internet side of the firewall and another communication device is installed on the intranet side of the firewall, the communication device Communication data can be transmitted in real time to another communication device. As a result, real-time two-way communication of communication data is possible inexpensively using the Internet without securing IP addresses to other communication devices while securing security of other communication devices with a firewall. Becomes

The communication program according to the present invention causes a computer equipped with a communication member that communicates with another communication device to cause the communication member to send a session establishment request to the other communication device. After establishing a session between the communication member and the communication member, the communication member transmits a request for transmitting communication data to another communication device, and after the communication member receives a response to the request for transmitting the communication data, the communication member performs another communication. The present invention realizes control means for transmitting a request for transmitting new communication data to the device.

If this communication device is used as a communication device to which communication data is transmitted, it means that a communication data transmission request is always output to another communication device, and the communication data is transmitted in the other communication device. If it occurs, it can be received immediately. Therefore, unlike the case where polling or the like is used, communication data can be transmitted in real time.

Moreover, if such a communication device is used as a communication device to which communication data is transmitted, a session is established between the communication device and the other communication device, and the communication data is always transmitted to the other communication device. It waits for the generation of communication data with the transmission request output. Therefore,
Even if the communication device of the transmission source is arranged on the Internet side of the firewall and another communication device is arranged on the intranet side of the firewall, the communication device of the transmission source may be replaced by another communication device via the Internet. Communication data can be transmitted to the communication device in real time. As a result, while ensuring the security of other communication devices with a firewall, there is no need to statically assign an IP address to other communication devices, and both real-time communication data can be inexpensively transferred using the Internet. It is possible to communicate with other parties.

[0064]

BEST MODE FOR CARRYING OUT THE INVENTION A communication data transmitting system, a communication data transmitting method, and a communication device and a communication program used for the same will be described below with reference to the drawings.

The communication data transmission method will be described as an operation of the communication data transmission system, the communication device of the transmission source will be described as the center server 13, and the communication device of the transmission destination will be the field terminals 36, 46 or the facsimile server. (FAX server) 42 will be described. The communication program is installed in the center server 13, the field terminals 36, 46 or the built-in recording media 20, 53 of the FAX server 42 via a recording medium such as a CD or a network such as the Internet. As described below.

Embodiment 1. FIG. 1 is a system configuration diagram showing a communication data transmission system according to the first embodiment of the present invention.

This communication data transmission system comprises the Internet 1 as a communication network for packet type communication data, the communication equipment 2 of the Internet connection service providing company connected to the Internet 1, and the Internet 1.
The communication equipment 3 of the real-time communication service providing company of the communication data connected to the user and the communication equipment 6 of the user connected to the communication equipment 2 of the internet connection service providing company via the local telephone network 4 and the leased line 5. Prepare

On the Internet 1, a user's client terminal 7 equipped with a browser function for transmitting a web page request and a transmission request for a control command, control data and the like, and for receiving and displaying the web page data.
Are connected. In addition, the base station 8, ATM (Asyn
A portable client terminal 11 is connected to the Internet 1 via a clone Transfer Mode (STM) switching network 9 and a protocol conversion server 10. It should be noted that each of the regional telephone networks 4 is actually a part of the ATM switching network 9. Further, the client terminal 7 may be connected to the Internet 1 via the communication facility 2 of the Internet connection service providing company.

The communication facility 3 of the real-time communication service providing company connects the intranet 12, the web server 13 connected to the intranet 12, the center server 14 connected to the intranet 12, the intranet 12 and the Internet 1. Router 15 and
Equipped with. The router 15 also has a function as a firewall that allows only specific types of data to pass through. Further, in this embodiment, client terminals 16 and 17 are also connected to the intranet 12.

The web server 13 stores a plurality of web pages required for the real-time communication service, and upon receiving a web page transmission request from the client terminals 7, 11, 16 and 17, the web page selected based on this request. Send data in response. Also, the web server 13
Transmits to the client terminals 7, 11, 16, 17 a web page including an object associated with a transmission request such as a control command or control data, and transmits the control command or control data transmission request to the client terminals 7, 11 , 16,
When it is received from 17, it is transferred (transmitted) to the center server 14. Further, when the web server 13 needs to acquire data from the center server 14 in order to generate a web page, the web server 13 outputs a data request to the center server 14 and allocates the received data as a response. Web page to client terminal 7,1
Send to 1,16,17.

FIG. 2 is a device configuration diagram showing the center server 14 in the communication data transmission system of FIG.

The center server 14 has a communication device 18 as a communication member connected to the intranet 12.
A central processing unit 19 as control means for transmitting and receiving communication data using the communication device 18, a built-in recording medium 20 for storing programs and data executed by the central processing unit 19, and a central processing unit 19. A memory 21 used when executing a program and a system bus 22 connecting these are provided.

The built-in recording medium 20 stores an operating system program 23 as well as a real-time communication data transmission program 24 for controlling real-time communication data transmission.

Operating system program 23
Is executed by the central processing unit 19 and manages the operation of each program that constitutes the real-time communication data transmission program 24, and the data between the peripheral device such as the communication device 18 and the program, and the data between the programs. It manages data communication between multiple programs, such as handing over.

Real-time communication data transmission program 2
The session establishing program 25 stored in the built-in recording medium 20 as a part of 4 is executed by the central processing unit 19 to realize a session establishing means in the center server 14. This session establishing means is a field terminal 3 which the communication device 18 will be described later.
6, 46 or the session establishment request from the FAX server 42, the session establishment process is performed, and the field device 36, 46 is set in the communication device 18.
Alternatively, it sends a session establishment response to the FAX server 42.

Real-time communication data transmission program 2
The list generation program 26 stored in the built-in recording medium 20 as a part of No. 4 is executed by the central processing unit 19 so as to realize a list generation means in the center server 14. When the communication device 18 receives the identification information 61 from the field terminals 36, 46 or the FAX server 42, which will be described later, the list generation means adds the identification information 61 to the identification information list 27 and updates the identification information 61 to the communication device 18. Field terminal 3
6, 46 or the confirmation response of the identification information to the FAX server 42 is transmitted.

When the communication device 18 receives communication data from the web server 13, the identification information list 27 stored in the built-in recording medium 20 identifies the transfer destination (transmission destination) communication device. Is used for. Therefore, for example, when a process as transmission data transmitting means, which will be described later, is activated each time the session establishing means establishes a session, a list in which the number of each process and identification information are associated with each other may be used.

Real-time communication data transmission program 2
The source communication data transmission program 28 stored in the built-in recording medium 20 as a part of
9 is executed to implement the transmission source communication data transmitting means in the center server 14. When the communication device 18 receives a communication data transmission request from the field terminals 36, 46 or the FAX server 42, the transmission source communication data transmitting means transmits the communication data to the field terminals 36, 46 or the FAX server 42 accordingly. When the communication device 18 receives the communication data from the web server 13 after that, the communication data is transmitted to the predetermined field terminals 36 and 46 or the FAX server 42 designated by the communication data. Is transferred (transmitted).

Specifically, for example, in response to receiving a request for transmitting communication data, the field terminal 36 relating to the request,
46 or a process for transmitting communication data to the FAX server 42 is activated. When the communication device 18 receives the communication data from the web server 13 in this state, first, the process corresponding to the destination specified in the communication data is specified using the identification information list 27, and the process is started. Hand over communication data. Next, the process causes the communication data to be transmitted from the communication device 18 to a predetermined field terminal 36, 46 or the FAX server 42. The operating system program 23 may actually perform the process specifying process using the identification information list 27.

Real-time communication data transmission program 2
The transmission source communication data reception program 29 stored in the built-in recording medium 20 as a part of
9 to implement the transmission source communication data receiving means in the center server 14. The transmission source communication data receiving means is for receiving the communication data received by the communication device 18 from the field terminals 36, 46 or the FAX server 42.

Specifically, the process of storing the received communication data in the built-in storage medium 20 and the process of generating new communication data according to the stored communication data are performed.
When new communication data is generated by such processing, this communication data is transmitted by the transmission source communication data transmitting means to the field terminals 36, 46 or the FAX server 42.
Sent to. The communication data transmitted from the field terminals 36, 46 or the FAX server 42 varies depending on the purpose of use of this communication data transmission system, but for example, the field terminals 36, 4
6 includes detection information of sensors 37 and 48 described later, control information of actuators 38, 39 and 49 described later, and a facsimile transmission result of the FAX server 42.

Real-time communication data transmission program 2
The web server transmission program 30 stored in the built-in recording medium 20 as a part of 4 is executed by the central processing unit 19 to realize a web server transmission means in the center server 14. The web server transmission means causes the communication device 18 to transmit the data stored in the built-in storage medium 20 by the transmission source communication data reception means in response to a data request from the web server 13. Even if new communication data for the web server 13 is generated in the transmission source communication data receiving means, the new communication data is sent to the web server 1 in response to the data request from the web server 13.
You can send it to 3

Real-time communication data transmission program 2
The list update program 31 stored in the built-in recording medium 20 as a part of 4 is executed by the central processing unit 19 to realize a list update means in the center server 14. The list updating means causes the communication device 18 to periodically send a start confirmation to all the field terminals 36 and 46 and the FAX server 42 listed in the identification information list 27, and there is no response to this. 36,46 or FA
The X server 42 is deleted from the identification information list 27.

The source communication data receiving means, the web server transmitting means, and the list updating means are executed independently of the waiting for receiving the communication data in the source communication data transmitting means. Specifically, it is executed as a process separate from the transmission source communication data transmitting means. As a result, even if the communication data is waiting to be received, the respective processes can be executed immediately regardless of the waiting state.

The communication equipment 2 of the Internet connection service providing company is a router 32 on the Internet side connected to the Internet 1 and a dial-up router connected to the user's communication equipment 6 via the local telephone network 4 and the leased line 5. User side router 33 and these routers 3
2 and 33 are connected to the proxy server 34.

When the proxy server 34 receives communication data or a communication data transmission request from the router 33 on the user side, the proxy server 34 outputs this to the Internet 1 from the router 32 on the Internet side, and the communication data or the communication request from the router 32 on the Internet side. When a request for transmitting communication data is received, this is output from the router 33 on the user side to the local telephone network 4 or the leased line 5.

Further, the routers 32 and 33 of these Internet connection service providing companies, particularly the router 32 on the Internet side, function as a firewall for blocking transmission requests for communication data from the outside. As a result, the security of the network equipment within the company can be ensured.

The user's communication equipment 6 includes, for example, a dial-up router 35 connected to the user-side router 33 via the local telephone network 4, and the dial-up router 3.
5, the field terminal 36 connected to 5, and the sensor 37 and actuators 38, 3 connected to the field terminal 36.
9 and.

The communication facilities 6 of other users are the local telephone network 4
A dial-up router 40 connected to the router 33 on the user side via the intranet 41, an intranet 41 connected to the dial-up router 40, a FAX server 42 connected to the intranet 41, and other communication devices 4
3, 44, and.

The communication equipment 6 of another user is connected to the router 33 on the user side via the leased line 5 by the router 4
5 and a field terminal 46 connected to this router 45
And a sensor 48, an actuator 49, and another communication device 50 connected to the field terminal 46 via the intranet 47.

FIG. 3 is a block diagram of the field terminals 36 and 46 in the communication data transmission system of FIG.

The field terminals 36 and 46 are a communication device 51 as a communication member connected to the router 35 or the intranet 47, and a central processing unit 52 as a control means for transmitting and receiving communication data using the communication device 51. , A built-in recording medium 53 for storing programs and data executed by the central processing unit 52, and a memory 54 used by the central processing unit 52 for executing the programs.
And a system bus 55 connecting them.
Further, when the sensor 37 and the actuators 38 and 39 are directly connected to the field terminal 36, an I / O port for transmitting and receiving data to and from the sensor 37 and the actuators 38 and 39 has a system bus. 5
Connected to 5.

On the built-in recording medium 53, an operating system program 56, a real-time communication data receiving program 57 for controlling real-time communication data transmission, and operations of the sensors 37, 48 and actuators 38, 39, 49 are controlled. A device control program 58 is stored.

Operating system program 56
Is executed by the central processing unit 52, and manages the operation of each program that constitutes the real-time communication data reception program 57, as well as the data between the peripheral device such as the communication device 51 and the program, and the data between the programs. It manages data communication between multiple programs, such as handing over.

Real-time communication data reception program 5
The session establishment request program 59 stored in the built-in recording medium 53 as a part of the
Is executed to realize the session establishment request means in the field terminals 36 and 46. This session establishment request means is composed of field terminals 36 and 46.
This is for causing the communication device 51 to transmit a session establishment request to the center server 14 at the time of starting.

Real-time communication data reception program 5
The identification information transmission program 60 stored in the built-in recording medium 53 as a part of 7 is for executing the identification information transmission means in the field terminals 36 and 46 by being executed by the central processing unit 52. is there. When the communication device 51 receives the session establishment response from the center server 14, the identification information transmission means causes the communication device 51 to transmit the identification information to the center server 14.

The identification information 61 stored in the built-in storage medium 53 is unique among at least the field terminals 36 and 46 in which the real-time communication data receiving program 57 is installed and the FAX server 42. If As a result, the center server 14 can identify each of the field terminals 36 and 46 or the FAX server 42 using the identification information 61.

Real-time communication data reception program 5
The destination communication data reception program 62 stored in the built-in recording medium 53 as a part of the
2 is implemented to implement the destination communication data receiving means in the field terminals 36 and 46.
The destination communication data receiving means causes the communication device 51 to transmit a communication data transmission request to the center server 14 when the communication device 51 receives the confirmation response of the identification information from the center server 14. The destination communication data receiving means causes the communication device 51 to transmit a communication data transmission request to the center server 14 when the communication device 51 receives the communication data from the center server 14.

The destination communication data receiving means does not set the time-out for the time from the output of the communication data transmission request to the reception processing of the communication data. Therefore, the destination communication data receiving means continues to wait until receiving the communication data after outputting the communication data transmission request.

Real-time communication data reception program 5
The destination communication data transmission program 63 stored in the built-in recording medium 53 as a part of the
2 is executed to implement the destination communication data transmitting means in the field terminals 36 and 46.
This destination communication data transmitting means is the field terminal 3
When the communication data to be transmitted to the center server 14 is generated within 6, 6, 46, the communication device 51 is caused to transmit the communication data.

Real-time communication data reception program 5
The start response program 64 stored in the built-in recording medium 53 as a part of 7 is to be executed by the central processing unit 52 to realize a start response means in the field terminals 36 and 46. When the communication device 51 receives the activation confirmation, the activation response means causes the communication device 51 to transmit an activation response in response to the confirmation.

The destination communication data transmitting means and the start response means are executed independently of the communication data reception waiting in the destination communication data receiving means.
Specifically, it is executed as a process separate from the destination communication data receiving means. As a result, each process can be executed even while waiting for reception of communication data.

The equipment control program 58 is executed by the central processing unit 52 to realize equipment control means in the field terminals 36 and 46. The device control means decodes the communication data received by the communication device 51, performs the control specified by the control command on the actuators 38, 39, 49 using the control data, and outputs the control result to the sensor. It is detected at 37 and 48. The detection result and the like are transmitted to the center server 14 as communication data by the destination communication data transmitting means.

The configuration of the FAX server 42 is the same as that of the field terminals 36 and 46 except that a dial-up connection device is added in addition to the communication device 51 and the device control program 58 is changed to a facsimile transmission program. It is the structure of. Then, when the FAX server 42 receives the communication data, the FAX server 42 performs a facsimile transmission process to another facsimile using the telephone number included in the communication data. The facsimile transmission result is transmitted to the center server 14 as communication data.

Next, the overall operation of the communication data transmission system having the above configuration will be described.

FIG. 4 is a communication sequence chart showing the overall operation of the communication data transmission system of FIG. In FIG. 4, each broken line is a time axis, and time advances from the upper side to the lower side.

For example, when the field terminals 36, 46 or the FAX server 42 are activated while the web server 13 and the center server 14 are activated, the session establishment requesting means of the field terminals 36, 46 or the FAX server 42 is operated. A session establishment request is transmitted from the communication device 51 under control. This session establishment request is sent to the dial-up routers 35 and 4
0, local telephone network 4, user side router 33, proxy server 34, Internet side router 32,
Alternatively, the router 45, the leased line 5, the router 3 on the user side
3, proxy server 34, router 3 on the Internet side
It is transmitted to the Internet 1 via 2. Also,
The session establishment request transmitted to the Internet 1 is received by the center server 14 from the Internet 1 via the router 15 and the intranet 12.

In the transmission of these communication data, the TCP / IP protocol (Transmissio) is used.
n Control Protocol / Intern
Packet switching technology based on et Protocol) is used.

When the communication device 18 of the center server 14 receives the session establishment request, the center server 14
The session establishing means therein performs a session establishing process, and the communication device 18 transmits a session establishing response as a response. This session establishment response is transmitted to the Internet 1 via the intranet 12 and the router 15, and thereafter, the field terminals 36 and 46 or the FAX server 42 are routed in substantially the same route as the session establishment request.
Sent to.

When the communication device 51 receives the session establishment response, the field terminals 36, 46 or the FAX
In the server 42, the identification information 61 is transmitted from the communication device 51 under the control of the identification information transmitting means. In the center server 14, when the communication device 18 receives the identification information 61, the list generation means causes the identification information list 2 to be displayed.
The identification information 61 is added to 7.

Further, the center server 14 periodically sends a start confirmation to each of the field terminals 36 and 46 or the FAX server 42 listed in the identification information list 27 under the control of the list updating means. When the communication device 51 receives this activation confirmation, each of the field terminals 36 and 46 or the FAX server 42 responds (transmits) an activation response under the control of the activation response means. The list updating means receives the activation response from each field terminal 3
6, 46 or the identification information of the FAX server 42 is deleted from the identification information list 27. As a result, the identification information list 27 is maintained as a list of the field terminals 36 and 46 and the FAX server 42 to which the center server 14 can transmit the communication data.

Further, the list updating means of the center server 14 causes the communication device 18 to transmit a confirmation response of the identification information. When the communication device 51 receives the confirmation response of the identification information, the field terminals 36, 46 or the FAX server 42 causes the communication device 51 to transmit the communication data transmission request under the control of the transmission destination communication data receiving means. The request for transmitting the communication data is received by the center server 14, and in the center server 14, the field terminals 36, 46 or the FAX server 42 relating to the request.
A process for transmitting communication data is generated for and is set to a communication data generation waiting state.

When the field terminals 36 and 46 or the FAX server 42 are deleted from the identification information list 27, the process corresponding thereto is also terminated. Also,
The process of deleting the identification information may be performed when the activation response is not received a plurality of times in succession due to a packet loss of communication data on the Internet 1 or the like.

As described above, the center server 14 establishes a session with the field terminals 36, 46 or the FAX server 42, and is set in a communication data generation waiting state.

On the other hand, when the web server 13 receives the web page request from the client terminals 7, 11, 16, 17, the web server 13 responds (transmits) the designated web page data to the client terminals 7, 11, 16, 17. .

Then, the web server 13 transmits to the client terminals 7, 11, 16, 17 a web page including an object associated with a transmission request such as a control command or control data, and the web server 13 responds to this. When a control command or control data transmission request is received as a response (transmission), the control command or control data is transferred (transmitted) to the center server 14 as communication data.

In the center server 14, the communication device 1
When 8 receives this control command or control data, the transmission source communication data transmitting means searches the identification information list 27, and the field terminals 36, 46 or the FAX server 4 of the transmission destination.
The process corresponding to 2 is specified, and the control command and control data are transmitted from the communication device 18 as communication data under the control of the process. As a result, when the center server 14 receives the control command and the control data, the center server 14 immediately transmits the control command or the control data to the desired field terminal 36, 46 or FA.
It can be transmitted to the X server 42.

When the communication device 51 receives a control command or control data as communication data, the field terminal 3
6, 46 or the FAX server 42, the communication data received by the destination communication data receiving means is stored in the built-in recording medium 53 and used for various controls by the device control means.

The field terminals 36 and 46 or the FAX server 42 which have received the control command and the control data issue a request for transmitting new communication data to the center server 14.
To the center server 14 and put the center server 14 into a waiting state for the generation of communication data. As a result, in the center server 14, the process of transmitting the communication data to the field terminals 36, 46 or the FAX server 42 is always activated, and the state in which the communication data can be immediately transferred is set. Can be maintained.

Furthermore, when communication data such as the detection results of the sensors 37 and 48 and the facsimile transmission result is generated as a result of the control of the device control means, the field terminal 3
6, 46 or the FAX server 42 transmits these communication data from the communication device 51 to the center server 14 under the control of the destination communication data transmitting means. In the center server 14, when the communication device 18 receives communication data from the field terminals 36, 46 or the FAX server 42, the communication data is stored in the built-in storage medium 20.

In this way, the client terminals 7, 1
The control commands and control data transmitted from 1, 16, 17 are immediately transmitted from the center server 14 to the field terminals 36, 4
6 and the FAX server 42.

The field terminals 36 and 46 and the FAX
The transmission request of the web page for displaying the control status and the control result in the server 42 is transmitted to the client terminals 7, 1.
When it is transmitted from 1, 16, 17 to the web server 13,
The web server 13 sends a data request to acquire the data required for the display. In the center server 14, when the communication device 18 receives this data request,
Built-in recording medium 20 under the control of the web server transmission means
The data such as the control status and the control result stored in is transmitted to the web server 13. The web server 13 generates web page data based on the data such as the control state and the control result, and the web page data is generated by the client terminals 7, 11,
Send to 16 and 17. As a result, the users of the client terminals 7, 11, 16 and 17 can use the field terminals 36, 46 and F based on the previous control commands and control data.
It is possible to know the device control result in the AX server 42.

The above embodiment is a preferred embodiment of the present invention, but various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the list creating means creates the identification information list 27 of the field terminals 36 and 46 or the FAX server 42, which has established the session and the center server 14 has received the identification information 61. Field terminal 36, 46 or F that has not responded to the data transmission request
The list of the AX server 42 may be generated.
Further, in this case, the identification information 61 may be transmitted together with the communication data transmission request.

Further, in this embodiment, the center server 14 and the field terminal 3 are connected via the Internet 1.
6, 46 or the FAX server 42 is transmitting and receiving communication data. For example, the center server 14 and the field terminals 36 and 46 are provided on the intranet so that the communication data can be transmitted and received using only the intranet. May be.

[0125]

According to the present invention, communication data can be inexpensively transmitted in real time between a plurality of communication devices via the existing Internet.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing a communication data transmission system according to a first embodiment of the present invention.

FIG. 2 is a device configuration diagram showing a center server 14 in the communication data transmission system of FIG.

3 is a device configuration diagram showing field terminals 36 and 46 in the communication data transmission system of FIG.

FIG. 4 is a communication sequence chart showing the overall operation of the communication data transmission system of FIG.

[Explanation of symbols]

1 Internet 4 Local Telephone Network 5 Leased Lines 7, 11, 16, 17 Client Terminals 12, 41, 47 Intranet 13 Web Server 14 Center Server (Communication device of transmission source, other communication device) 15 Router 18, 51 Communication device ( Communication member) 19,52 Central processing unit (control means) 20,53 Built-in recording medium 21,54 Memory 22,55 System bus 23,56 Operating system program 24 Real-time communication data transmission program 25 Session establishment program 26 List generation program 27 Identification information list (list of destination communication devices) 28 Source communication data transmission program 29 Source communication data reception program 30 Web server transmission program 31 List update program 32 Internet side router 33 User User-side router 34 Proxy server 35 Dial-up router 36,46 Field terminal (destination communication device) 37,48 Sensor 38,39,49 Actuator 40 Dial-up router 42 FAX server (destination communication device) 45 Router 57 Real Time Communication Data Reception Program 58 Device Control Program 59 Session Establishment Request Program 60 Identification Information Transmission Program 61 Identification Information 62 Destination Communication Data Reception Program 63 Destination Communication Data Transmission Program 64 Start Response Program

Claims (20)

[Claims] 1. A communication data transmission system for transmitting communication data from a source communication device to a destination communication device, wherein the destination communication device transmits a session establishment request to the source communication device. Then, after establishing a session with the communication device of the transmission source, a transmission request of communication data is transmitted to the communication device of the transmission source, and the communication device of the transmission source transmits to the communication device of the transmission destination. A communication data transmission system characterized in that it does not respond to the transmission request of the communication data until the communication data to be transmitted is generated. 2. A communication data transmission system for transmitting communication data from a source communication device to a plurality of destination communication devices, wherein each destination communication device establishes a session with the source communication device. After transmitting the request and establishing a session with the communication device of the transmission source, a transmission request of communication data is transmitted to the communication device of the transmission source, and the communication device of the transmission source establishes the session. A communication list to be transmitted to any one of the above-mentioned destination communication devices, or a list of the above-mentioned transmission destination communication devices receiving the communication data transmission request. When data is generated, the communication device of the transmission destination is specified based on the list, and the communication data is transmitted in response to the transmission request of the communication data from the communication device of the transmission destination. Data transmission system. 3. The communication device of each transmission destination is for distinguishing the communication device of the transmission destination from the communication devices of other transmission destinations prior to the transmission of the transmission request of the communication data immediately after the session is established. Transmitting identification information, the communication device of the transmission source uses the identification information of the communication device of each transmission destination to generate a list of communication devices of the transmission destination receiving the transmission request of the communication data. The communication data transmission system according to claim 2. 4. The communication device of each transmission destination periodically transmits an activation notification to the communication device of the transmission source after transmitting the transmission request of the communication data, and the communication device of the transmission source transmits the activation notification. 4. The communication data transmitting system according to claim 2, wherein the communication device of the transmission destination that has not received the message is deleted from the list. 5. The transmission destination communication device, after receiving a response to the communication data transmission request from the transmission source communication device, transmits a new communication data transmission request to the transmission source communication device. The communication data system according to any one of claims 1 to 4, characterized in that: 6. When the communication data to be transmitted to the communication device of the transmission source is generated, the communication device of the transmission destination transmits the communication data to be transmitted regardless of whether or not a transmission request for the communication data is transmitted. The communication data system according to any one of claims 1 to 5, wherein the communication data system transmits the communication data to a communication device which is a transmission source. 7. A communication data transmitting method for transmitting communication data from a source communication device to a destination communication device, wherein a session is established between the destination communication device and the source communication device. Then, the transmission destination communication device transmits a communication data transmission request to the transmission source communication device, and the transmission source communication device generates communication data to be transmitted to the transmission destination communication device. The communication data transmitting method is characterized in that the communication data transmitting request is not responded until the above. 8. A communication data transmission method for transmitting communication data from a communication device of a transmission source to a communication device of a plurality of transmission destinations, wherein the communication device of each transmission destination and the communication device of the transmission source are connected to each other. After establishing the session, the communication device of the transmission destination transmits a transmission request of communication data to the communication device of the transmission source, and the communication device of the transmission source is the communication device of the transmission destination of which the session is established. Create a list or a list of destination communication devices that have received the communication data transmission request, and if there is communication data to be transmitted to any of the destination communication devices, add it to the list. A communication data transmitting method characterized in that a communication device of a transmission destination is specified based on the communication device, and the communication data is transmitted in response to a transmission request of the communication data from the communication device of the transmission destination. 9. The communication device of each transmission destination distinguishes the communication device of the transmission destination from communication devices of other transmission destinations prior to transmission of a transmission request for communication data immediately after a session is established. Transmitting identification information, the communication device of the transmission source uses the identification information of the communication device of each transmission destination to generate a list of communication devices of the transmission destination receiving the transmission request of the communication data. The communication data transmitting method according to claim 8. 10. The communication device of each transmission destination periodically transmits an activation notification to the communication device of the transmission source after transmitting the transmission request of the communication data, and the communication device of the transmission source transmits the activation notification to the communication device of the transmission source. 10. The communication data transmitting method according to claim 8 or 9, characterized in that the communication device of the transmission destination that has not received the message is deleted from the list. 11. The transmission destination communication device transmits a new communication data transmission request to the transmission source communication device after receiving a response to the communication data transmission request from the transmission source communication device. The communication data transmitting method according to any one of claims 7 to 10, characterized in that. 12. The communication device of the transmission destination, when communication data to be transmitted to the communication device of the transmission source is generated, transmits the communication data to be transmitted regardless of whether or not a transmission request for the communication data is transmitted. The communication data method according to claim 7, wherein the communication data is transmitted to the original communication device. 13. A communication device comprising: a communication member for communicating with another communication device; and control means for transmitting / receiving communication data to / from the other communication device using the communication member. Then, the control means, after establishing a session with the other communication device, when the communication member receives a transmission request for communication data from the other communication device, communication to be transmitted to the other communication device. A communication device which does not respond to a transmission request for the communication data until the data is generated. 14. The control means generates a list of destination communication devices receiving a communication data transmission request using the identification information from the other communication device received by the communication member, 14. The communication device according to claim 13, wherein when the communication member no longer receives the activation notification from the other communication device, the other communication device is deleted from the list. 15. A communication device comprising: a communication member that communicates with another communication device; and control means that transmits and receives communication data to and from the other communication device using the communication member. Then, the control means causes the communication member to transmit a session establishment request to another communication device to establish a session with the other communication device, and then the communication member sends the communication device to the other communication device. Transmission request of the communication data is transmitted, and after the communication member receives a response to the transmission request of the communication data, the communication member is caused to transmit a request for transmitting new communication data to the other communication device. Characterized communication device. 16. The control means, prior to the transmission of the first transmission request for communication data after the session is established,
The communication device according to claim 15, wherein identification information uniquely assigned to the communication device is transmitted from the communication member to the other communication device. 17. The control means causes the communication member to periodically transmit an activation notification to the other communication device after transmitting the first transmission request for communication data after the session is established. The communication device according to claim 15 or 16. 18. The control means, when communication data to be transmitted from the communication member to the other communication device is generated,
16. The communication data to be transmitted is transmitted from the communication member to the other communication device regardless of whether or not the communication data transmission request is transmitted.
7. The communication device according to any one of 7. 19. A computer having a communication member for communicating with a communication device, wherein a list including the communication device is generated in response to receipt of identification information from the communication device at the communication member, and the communication member is generated. After receiving the transmission request for the communication data from the communication device in
When the communication data to be transmitted to the communication device is generated, the communication device is selected from the list to cause the communication member to transmit a response to the communication data transmission request and to realize control means for transmitting the communication data. Computer readable communication program. 20. A computer provided with a communication member that communicates with another communication device, causes the communication member to transmit a session establishment request to the other communication device, and communicates with the other communication device. After establishing the session, the communication member is caused to transmit a request for transmission of communication data to the other communication device, and after the communication member receives a response to the request for transmission of communication data, the communication member A computer-readable communication program for realizing a control means for transmitting a request for transmitting new communication data to a communication device.