JPS61157042A - System for connecting terminal device having different kind of protocols on lan - Google Patents

Abstract

PURPOSE:To attain correspondence with a terminal device without an protocol function by providing an application program operated by a different kind of protocol in addition to an application program by an LNDF protocol and a device kind identification means identifying the device type of the terminal device. CONSTITUTION:When a terminal device C transmits a data to a terminal device A, an MAC address of the device A is written to a destination address and the own MAC address is described to a sender address and the result is transmitted. The data is transmitted to an LNC2, an LNC-FCP3 and an address check section 4 of the terminal device A and the sender address is decoded. Thus, the address check section 4 gives a control to the application program 7 being a non- LNDFC corresponding program, then a prescribed control is applied by using respective application programs not through the LNDFC protocol.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is based on a local area network (LAN).
The present invention relates to a method for connecting different protocol terminals on a network (work), and in particular to a coexistence method that can be used even by different protocol terminals.

[Conventional technology]

As data processing devices become more widespread, LANs are being used in which data processing devices located within a limited area, such as within a business office, are connected to a common bus so that they can be used by each other.

In the conventional LAN system, as shown in FIG. 4, when transmitting and receiving data between the terminal device I01 and the terminal device 102, LNDFC (LAN DataFlow Co.
TAM (Tra
Only systems with a configuration that incorporated the application APL on top of the nsmissiOn Access Method could be connected. For example, from terminal device I01 ■
When transmitting data to 02, the TAM of the terminal device 101
sends a command CNCT, which is a path establishment request, to the terminal device "W102".The terminal device "W102" receives this command CNCT, and if the bus can be established, the T
The AM returns an acknowledgment CACK to this.

In addition, in FIG. 4, LNG (Local a
rea Network (:ontroller)
is a LAN line adapter that connects the terminal device ■0 to the LAN line, and includes a physical control unit and MAC (Me) that controls the data link between the physical control unit and the FCP.
dium Access Control) is provided, and the terminal device 0 is provided with an LNG-FCP for drive-controlling this LAN line adapter LNG.

The TAM also performs control such as which of the plurality of application programs of the terminal device should be communicated with.

[Problem that the invention seeks to solve]

By the way, in the conventional LAN system, as mentioned above, the L
Only systems with built-in applications on TAMO that supported the NDFC protocol could be connected.

Therefore, even if there is a low-function terminal in the same office that does not have a protocol or has an application program connected directly to the hardware, there is a problem that it cannot be used by connecting it to the LAN line. Ta.

[Means for solving problems]

As mentioned above, in order to solve the problem that, for example, it was not possible to connect a terminal device that does not have a protocol function to a LAN line to which a terminal device that has a protocol function is connected, the present invention uses a heterogeneous protocol on a LAN. In the terminal connection method, multiple LNDs are connected to the LAN line.
In a LAN system to which FC protocol terminal devices are connected, if the number of LNDFC protocol terminal devices is small (one
In addition to the application program using the LNDFC protocol, the base is provided with an application program that operates using a different protocol, and is also provided with a model identification means for identifying the model of the terminal device, and each terminal device is assigned a code corresponding to its model. The present invention is characterized in that by identifying this code by the model identification means, the model of the other party is recognized and the corresponding application program is selectively operated.

[Effect]

In the present invention, even if a transmission is received from a terminal device without a protocol function, the destination terminal device can transfer control to an application that can communicate with such a terminal device. However, it is possible to communicate.

〔Example〕

Before describing the present invention in detail based on one embodiment, an outline thereof will be explained.

In the present invention, an application that operates using a different protocol is provided in a terminal device that operates using the LNDFC protocol. Then, identify whether the source terminal device operates using the LNDFC protocol or a different protocol terminal, for example, by the source address, and if the source is a different protocol terminal, control is passed to an application that is compatible with this terminal device. . With this configuration, it is possible to send and receive data to and from different protocol terminals, so such terminals can be connected to the line.

An embodiment of the present invention will be described based on FIGS. 1 to 3.

Figure 1 is a configuration diagram of one embodiment of the present invention, Figure 2 is its TAM
A detailed view of the ' section, Figure 3, is the data format.

In FIG. 1, a terminal device A is constructed according to the present invention.1. A terminal unit fifB is equipped with a terminal unit 1 and a local area network control unit (LNG) 2.
has an existing LNDFC protocol function, and is equipped with a terminal unit 11 and LNG 12, and a terminal device C
is a heterogeneous terminal that does not have an LNDFC protocol function and is equipped with a terminal section 21 and an LNG 22. This terminal device C is, for example, a terminal device that does not have a protocol.

The terminal unit 11 has a configuration that will be described in detail later based on FIG. 2, and is connected to the LAN line via LNG 2.

LNG2 is an LA consisting of a physical control section and a MAC section.
It is an N line adapter. MAC part is LNC-FCP L
L C (Logical Link Control)
) unit and the physical control unit to perform data link control, and for frame transmission, LNG-FC,
It receives data from P, forms a frame, and outputs a bit data string to the physical control unit for transmission onto the transmission path. In addition, the MAC unit receives a bit data string from the physical control unit in response to frame reception, and outputs the frame to the LNG-FCP, but if the frame is not addressed to its own address, it performs operations such as discarding the frame. This MAC section has an address and identifies the terminal device. The configuration is such that the protocol of the terminal device can be determined based on the address number. Here, LNG-FCP (LAN Con
troller-File Control Progr
am) is a program that controls the LNC (hardware), which is an adapter to a LAN line.

The terminal unit 1 includes an LNC-FCP 3, a MAC address check unit 4, an LNDFC handling unit 5, an application program APL-A that operates using the LNDFC protocol method, an application program APL-D that operates using a non-LNDFC, that is, a different protocol, and the like. It is. LNG-FCP
3 is for driving a local area network control hard interface and handling LCC type protocols.

As shown in FIG. 2, the MAC address check section 4
It includes a message receiving section 4-1 and a message analyzing section 4-2, and the L
It sends and receives messages to and from the NC-FCP 3, and analyzes the source MAC address of messages received and sends messages to and from the LNDFC handling unit 5 or non-LNDFC compatible program 7 for different models depending on the source address of the message. This is to selectively control one of the two. In this example, if the terminal device is of a non-LNDFC type, its MAC part address will be assigned a number greater than 900, and if it has an LNDFC protocol function, its OMAC part will be assigned a number greater than 900.
Addresses in the 0 range or below are assigned . and 1, so identification control is performed based on this.

The LNDFC handling unit 5 handles the LNDFC protocol, decodes the logical byte part of the received message, recognizes the corresponding socket address that instructs which application program to run, and performs message reception processing corresponding to the upper application program. This is what we do.

The message receiving section 4-1, the message analyzing section 4-2, and the LN
The DFC handling section 5 and the like constitute a transmission access method section TAM' of the terminal body.

The application program 6 is an application program that operates based on the LNDFC protocol like the conventional application program shown in FIG.

The application program 7 is an application program that operates on a non-LNDFC type heterogeneous protocol, and is, for example, an application program for a terminal that does not have a protocol.

This application program 7 is configured such that, in the terminal device A, one having the same function as, for example, the most representative application program among the plurality of application programs 6 operates using a different protocol.

Terminal device B is the terminal device 101.10 shown in FIG.
2, and operates based on the LNDFC protocol, and its application program APL-B, like application program 6, operates based on the LNDFC protocol.
It operates on TAM based on the protocol.

However, the address of the MAC section of the LNC 12 in terminal device B has a number in the 400 series added thereto indicating that it is an existing terminal.

The terminal device C is of a non-LNDFC type, and is, for example, a terminal that does not have a protocol. This terminal device C
The address of the OMAC section is assigned an address in the 900s or higher.

Note that each of the terminal devices A, B, and C has a table showing the functions of other terminal devices, and is configured to be able to determine with which terminal it is possible to transmit data.

(11 When transmitting data from terminal device C to terminal device A, when terminal device C transmits data to terminal device A, as shown in Fig. 3, the destination address DA is the terminal device AOMAC address (800 in this example). Enter the source address SA and enter your own MAC address (901 in this example)
Fill out and send. This is LNC2, L of terminal device A
The message is transmitted to the message analysis section 4-2 via the NC-FCP 3 and the message reception section 4-1, and the source address SA is decoded. At this time, since 5A=901 is entered, it is recognized that the MAC address of the sender is greater than 900. As a result, the message analysis section 4-2 uses non-LNDFC
Since control is passed to the application program 7, which is a corresponding program, predetermined control can be performed by each application program without going through the LNDFC protocol.

(2) When transmitting data from terminal device B to terminal device A, as shown in Figure 3, enter the MAC part address of terminal device A (800 in this example) in destination address DA, and enter the MAC part address of terminal device A (800 in this example) in source address SA. Enter the MAC unit address (400 in this example) of the computer, enter the number of one of the application programs 7 as the logical machine number, and send. This is the L of terminal device A
The message is transmitted to the message analysis section 4-2 via the NC2, LNC-FCP3 and message reception section 4-1, and the source address SA is decoded. At this time, since 5A=400 is entered, it is recognized that the MAC address of the sender does not reach 900. As a result, the message analysis unit 4-2 not only transmits the logical machine number to the LNDFC handling unit 5, but also passes control to it, so that protocol control based on LNDFC is performed, and then the message is sent by the application program for the socket of that logical machine number. Reception processing is performed.

In the above description, the case of a terminal that does not have a protocol as a heterogeneous terminal has been explained, but it goes without saying that terminals that operate using a heterogeneous protocol can also be connected to a LAN line and operated in the same manner.

〔Effect of the invention〕

According to the present invention, a machine number is assigned to each terminal device according to its model, and by decoding this machine number, it is possible to select and control the corresponding application.
Terminal devices using protocols other than C protocol can also be used by connecting to a LAN line.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of one embodiment of the present invention, Figure 2 is its TAM
3 shows the data format, and FIG. 4 shows the conventional example. In the figure, 1 is a terminal unit, 2 is a local area network control unit, 3 is an LNG-FCP, 4-1 is a message receiving unit, 4
-2 indicates a message analysis section, and 5 indicates an LNDFC handling section.

Claims (1)

[Claims] In a LAN system in which a plurality of LNDFC protocol terminal devices are connected to a LAN line, at least one of the LNDFC protocol terminal devices is provided with an application program that operates according to a different protocol in addition to the application program according to the LNDFC protocol, and the model of the terminal device is identified. Furthermore, each terminal device is assigned a code corresponding to its model, and by identifying this code with the model identification means, the device of the other party is recognized and the corresponding application program is selected. 1. A heterogeneous protocol terminal connection method on a LAN, characterized in that: