JPS6199439A - Group address communication system - Google Patents

Abstract

PURPOSE:To access all terminals simultaneously by setting a group address to plural devices having various addresses at the first access from an adapter of a transmitter of LAN and accessing them with this group address at the next time to transfer data. CONSTITUTION:Individual addresses #20 and #40 of devices to be grouped and address #100 to this group are set to a data part of a frame by a device 1 and are transmitted with broadcast (DA=all 1). Each device takes in the data frame of broadcast, and the device ignores it and does not respond if its own individual address is not designated in the group like #30 or #50; but if its own individual address is designated there like #20 or #40, the device sets group address (GA) #100 to a variable group address set area and transmits back the response to a device of address #10. Group address (GA) #100 is set to the destination address (DA) to transfer data, thereby accessing multicast data to only devices of addresses #20 and #40.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a LAN (local area network)
The present invention relates to a group address communication system that has the ability to flexibly transfer data to multiple arbitrary devices at the same time by using a device adapter in the communication system.

[Conventional technology]

Recently, a LAN (Local Area Network) communication system, such as the Ethernet made by Zestx, has been used as an information processing device system for transaction processing or office processing. That is, within a relatively limited area, as shown in FIG. 3, terminal devices, such as office automation (OA) devices 1 to 5, are connected to a common bus 6 in a six-by-one manner. When sharing a common bus like this, there are usually many methods, such as a method that grants exclusive rights under the control of a higher-level device, or a method that gives priority to use in response to a timing signal, but all of them require control of the higher-level device. It is.

On the other hand, the LAN communication method does not require control from a host device, and each device autonomously detects and confirms the signal state of the common bus. One example of this is the C8M/CD (carrier sense φ multiple access φ collision detection) system developed for the Ethernet. That is, when making a call, it is checked whether or not another device is transmitting using an adapter provided in each device connected to the network.

If no other device is transmitting, it starts transmitting to the other party and monitors for a certain period of time whether or not the other device's transmission appears, and detects whether or not there is a collision of transmission carriers.

If a collision occurs, retransmission is performed after an appropriate time υ that varies depending on the device. In this way, the dedicated time for the common bus can be obtained and desired data transfer can be performed.

In this case, it goes without saying that the adapter of the LAN originating terminal can access the addresses of other end-of-month addresses.
You can also access all other devices at the same time. So-called broadcasting is possible.

[Problems that Hikari is trying to solve] When the above LAN communication method is applied to transaction devices and OA equipment, there are cases where data is sent from the originating terminal to each terminal separately,
In addition to sending data to all terminals, there are many cases where it is desired to send data to a group of combined terminals depending on the purpose, and to send other data to a different combination of terminals. In such a case, in the past, each terminal had to be selected and sent one by one, which was not efficient in terms of time.

As described above, it is difficult to deal with cases where the combination of partner terminals changes flexibly depending on the purpose and use of data from the transmitting terminal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a group address communication system that utilizes a device adapter in a LAN communication system and has a function of flexibly transferring data to any plurality of devices at the same time.

[Means for solving problems]

In order to achieve the above object, the group address communication method of the present invention saves the entire installation cost by setting arbitrary multiple addresses to be grouped and a group address that collectively indicates this group to zero in the data frame sent from the LAN adapter. After transmitting and setting the group address in the designated device, data transfer is performed using this group address.

[For production]

With the above configuration, from the adapter of the LAN transmitting device,
At the first access, a group address is set in a device with multiple addresses, and then access is made using this group address to transfer data, and after the transfer is completed, it is released. In this way, data can be flexibly transferred to any matching device at the same time.

[Implementation row]

) FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, and FIGS. 2-2 are explanatory diagrams of its operation.

In FIG. 1, the configurations of terminal devices 1 to 5 include local network programs for LAN adapters 11 to 51, respectively. The LAN adapter internally has one individual address (2 people) and eight group addresses (OA), and this group address (0 people) is composed of four fixed addresses and four variable addresses. , if the destination address of the data 7 reno flowing on the network matches these addresses that it owns, it has the function of importing this 7 reno.

Four fixed addresses among the group addresses (0 people) are set at the time of initial program setting (1PL).

The remaining four variable addresses are flexibly set as one of the groups upon request from the higher-level program.

In the figure, terminal devices 1, 2 . ..., 5 orchid addresses (2 people) each 10. 20. ..., Su5
If it is 0, there are 10 devices 1 and 20. The procedure for setting a group of 100 group addresses (0 people) with 40 devices 2 and 4 will be explained using the 20th example.

Figures 2 - 2 show the procedure from GA assumption to release, and the right side shows the 7-frame format data sent in each procedure.

The frame format has 229 destinations at the beginning.

Next, by setting all °1” to your own address SA and the destination address 0 people with the data section below,
Broadcast, ie, send a data frame to all other devices. In contrast, the present invention employs multicasting, in which the same data frame is flexibly transmitted only to devices L- in a desired combination group, and released after completion.

The data lines 1 to 2 in FIG. 1 and the steps 2 to 2 in FIG. 2 are shown in correspondence with each other. In other words, (1) the individual address names 20. of the devices to be grouped in the data section of the frame for the 10 devices 1; 40 and the addresser 100 for that group are set and sent by broadcast (D people=all 1'').This data path is shown by the cross-eating data diagram.

, ■Each device captures the broadcast data frame and sends it to the device. If your individual address is not specified as a group, as in case 50, it will be ignored and will not respond.
N20. When specified as 40, the device sets the group address (0 people) 100 in the variable group address setting area and returns a response to 10. This data path is shown by diagonal hatching data lines.

■Group address (OA, 1) to destination address (DA)
By setting 100 and transferring data, 20. The multicast data is accessed only to the base 40. This is shown by a blank data line.

■After the above multicast ends, broadcast (DA
= all "1'), the frame notifying the release of the group, that is, the data part, is sent blank.
40 grubners 100 are released.

〔Effect of the invention〕

As explained above, according to the present invention, a group address is set in a device with multiple addresses in the first access from the adapter of a LAN transmitting device, and then data is transferred by accessing with this group address, After the transfer is completed, it is released. With this, the group address can be set/changed flexibly, so that a certain device can belong to each group depending on the purpose and use. moreover,
In the past, when the combination of groups was variable, items that had to be sent sequentially can be sent simultaneously, which improves transfer efficiency.

[Brief explanation of drawings]

Fig. 1 is a configuration explanatory diagram of an embodiment of the present invention, an operation explanatory diagram showing the procedure of a second expanded embodiment, Fig. 6 is a LAN system, 6 is a common bus, PA is an individual address, and 0 people are Indicates the group address.

Claims (1)

[Claims] In order to perform data communication between multiple devices connected to a common bus within a relatively limited area without the control of a host device,
In a local area network communication system in which each device has a function of dedicating the bus by detecting the status of a common bus and signal collisions, and an adapter that has the function of accessing each device individually and accessing all devices at the same time. , set a group address that collectively indicates multiple addresses to be grouped and the group in the data frame sent from the adapter, and send it to all devices. After setting the group address to the specified device, A group address communication method characterized by comprising means for transferring data using a group address and capable of flexibly transferring data to any plurality of devices at the same time.