JPH07115425A - Data transmission method - Google Patents

Abstract

PURPOSE:To broadcast partially different data in the information communication system where each station is coupled by LAN and the simultaneous multi- address communication function is provided for 1:N or N:N data transmission. CONSTITUTION:A transmission station 11 takes out common data by the request of simultaneous multi-address transmission (S1), and peculiar data different by reception stations are added to this data (S2), and data is transmitted as simultaneous multi-address data (S3). Reception stations 12 to 1N receive the data (S4) and extract common data and peculiar data destined for stations themselves (S5) and transmit data to their sub-slave stations 22 to 2N (S6). Thus, the simultaneous multi-address transmission where reception stations receive the same data is realized, and each reception station extracts common data and peculiar data destined for the station itself from received data to obtain data partially different by the station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transmission system by LAN connection, and more particularly to a data transmission method for simultaneous broadcast (broadcast communication).

[0002]

BACKGROUND OF THE INVENTION 1-to-N data transmission or N pairs system for transmitting information of N, broadcast on LAN, as shown in FIG. 3, the station 1 ₁ LAN network became transmission station All the stations 1 ₂ to 1 _N that have become the receiving stations can receive the data to be loaded on. Each of the receiving stations 1 ₂ to 1 _N transmits the received data to the grandchild stations 2 ₂ to 2 _N , respectively.

In this simultaneous broadcast, the data of the route shown by the arrow in the figure is transmitted with the same configuration for each station.

[0004]

In the conventional transmission method,
If even part of the data transmitted to each station is different, broadcast cannot be used. At this time, data transmission is individually performed to each station, and simultaneous broadcast of alarms and the like cannot be performed, so that the delay becomes a problem.

Further, when a part of the transmission data is the same and different data for each receiving station is added to the data for transmission, a unique transmission address is defined between the receiving station and its grandchild station. If there is, broadcast cannot be used.

It is an object of the present invention to provide a transmission method that enables simultaneous broadcasting of data that is partially different.

[0007]

In order to solve the above-mentioned problems, the present invention provides an information communication system in which stations are connected by a LAN and a broadcast function is provided for 1-to-N or N-to-N data transmission. The transmitting station transmits the broadcast data structure as common data of each receiving station with the unique data of each receiving station added, and each receiving station receives the broadcast data and receives the common data and its own station. It is characterized in that the specific data addressed to it is extracted and used as the received data.

[0008]

[Function] LAN is configured by adding broadcast broadcast data to common data as well as specific data for each receiving station.
The data to be placed on the board, that is, the data received by each receiving station is the same data, and a simultaneous broadcast transmission is obtained, and each receiving station extracts common data from the received data and unique data addressed to itself to make it possible Get different data.

[0009]

FIG. 1 is a processing block diagram showing an embodiment of the present invention. In station 1 ₁ has become a transmitting station, takes out the common data in broadcast transmission request (S1), it adds data to be transmitted to the common data to each station a unique (S2), LAN
The simultaneous broadcast output is performed (S3).

As shown in FIG. 2, the broadcast output data has a structure in which common data common to all stations and unique data for each station are added to the broadcast header.

In the illustrated example, the common data is the time signal data, and the unique data is the case where the transmission addresses of the receiving station and the grand station are different, and the address is used as the data.

Returning to FIG. 1, in the receiving stations 1 ₂ to 1 _N , the station 1
As representatively shown in the _2, the broadcast data carrying from the station 1 ₁ on the LAN is received, including the specific data (S
4).

Next, the receiving station extracts common data and unique data addressed to itself from the received broadcast data (S
5), data is transmitted to the grand station 2 ₂ (S6). In this data transmission, since the unique data is the electric station address, when the grand station of the own station has the address, common data to which this address is added is transmitted.

In the grand stations 2 _{2 to} 2 _N , the grand stations having the same address from the transmission data from the respective receiving stations receive the data (S7).

Therefore, the broadcast data to be put on the LAN has a structure in which the common data has unique data of each receiving station as additional data, and the broadcast data is transmitted from the transmitting station to each receiving station. At, the unique data of each station is extracted from the additional data and transmitted to the grand station.

Since transmission / reception at this time has the same data structure for each of the stations 1 ₂ to 1 _N , reception can be performed in the same manner as conventional broadcast reception. In addition, even when different data is to be transmitted for each receiving station, the data can be sent and received by simultaneous broadcast.

The unique data is not limited to the address of the grand station, but may be a combination of the address and the actual data.

Further, in a system in which each station does not have a grand station, when partially different data is transmitted to each receiving station, the broadcast data can be broadcast by using the unique data as the data for each receiving station.

[0019]

As described above, according to the present invention, in the information communication system provided with the broadcast function, the data structure of the broadcast is the common data to which the unique data for each receiving station is added, Since each receiving station receives the broadcast data and extracts the common data and the unique data addressed to itself, and uses it as the received data, it is possible to use the broadcast transmission function to transmit the data including some partially different data. is there.

[Brief description of drawings]

FIG. 1 is a processing block diagram showing an embodiment of the present invention.

FIG. 2 is a data configuration diagram in the embodiment.

FIG. 3 is an example of partial broadcast transmission.

[Explanation of symbols]

1 ₁ ... Transmitting station 1 ₂ , 1 _N ... Receiving station 2 ₂ , 2 _N ... Subordinate station

Claims (1)

[Claims] 1. In an information communication system in which each station is connected by a LAN and is provided with a broadcast function for 1-to-N or N-to-N data transmission, the transmitting station sets the broadcast data structure to the common data of each receiving station. Is transmitted as data to which unique data for each receiving station is added, and each receiving station receives the broadcast data and extracts the common data and the unique data addressed to itself as received data. Data transmission method.