JPH04156146A - Data division system for communication controller - Google Patents

Abstract

PURPOSE:To improve the efficiency of data transfer by automatically and most suitably dividing a transmission data division object data part received from a host to the transfer data length according with the transmission line of the transmission destination. CONSTITUTION:A division control part 4 is provided with a division control table 5 where addresses of line connection parts 6 and data division length based on maximum transfer data length determined to transmission lines 7 and 8 to which line connection parts 6 are connected are registered correspondingly to each other. At the time of transmission, the data division length of the transmission line 7 or the like as the transmission destination is obtained from the division control table 5 based on the address, and this data division length is used to automatically divide transmission data from a host 1 on demand, and this data is assembled into frames, and these frames are successively transferred to the line connection part 6 and are transmitted. Thus, data is efficiently transferred.

Description

[Detailed Description of the Invention] [Summary] Regarding a data division method in a communication control device, for the purpose of efficiently transferring data, a host connection unit that controls the interface with the host and each part are connected to different transmission paths. In the communication control device, the communication control device includes a plurality of line connection units, and a division control unit that performs data division processing and is provided between the host connection unit and the plurality of line connection units. A division control table is provided in which the address of each line connection unit is registered in association with a data division length based on the maximum transfer data length specified for the transmission path to which the line connection unit is connected, and the division control unit , when receiving the address of the line connection unit and transmission data from the host via the host connection unit, calculate the data division length from the division control table based on the address, and use the data division length to receive data from the host. It has a configuration in which the data portion to be divided of the transmitted data is divided as necessary, each part is assembled into a frame, and each assembled frame is sequentially passed to the line connection unit for transmission.

[Industrial Field of Application] The present invention relates to a communication control device, and particularly to a communication control device equipped with line connection sections each connected to a transmission path having a different protocol, which transmits data according to the transmission path of the destination. This invention relates to a data division method that automatically divides data into optimal transfer data lengths.

[Conventional technology]

FIGS. 4 to 7 are explanatory diagrams showing a data division method in a conventional communication control device.

FIG. 4 is an explanatory diagram showing an outline of a conventional communication control device, in which 41 is a host computer (hereinafter referred to as host);
2 is a communication control device, 43 is a host connection unit, 44 is a division control unit, 45 is a line connection unit connected to, for example, a bus type LAN 46, 47 is a terminal connected to the bus type LAN 46, 48 is a line connection unit connected to the ring type LAN 49, for example, and 50 is a terminal device connected to the ring type LAN 49.

Here, the communication control device 42 includes a host connection section 43, a division control section 44, and a plurality of line connection sections 45, 48,
The host connection unit 43 controls the interface with the host 41, and the division control unit 44 controls the address (port number) of the line connection unit connected to the destination transmission path from the host 41 via the host connection unit 43, and the transmission data. When the host 41 receives this data, it divides the transmission data into pre-specified division lengths as necessary, assembles each frame into frames, and sequentially passes each assembled frame to a designated line connection section for transmission. I have to.

FIG. 5 is an explanatory diagram showing how data is divided at this time.

In the figure, 51 is connected to the host 4 via the host connection unit 43.
1 to the division control unit 44, which consists of the port number indicating the address of the line connection unit connected to the transmission path of the transfer destination and transmission data, and the transmission data includes the division target data, the communication destination address OA, It consists of a source address S^ and control information (data length to be divided, sequence number, etc.). 52 is a frame in which this transmission data is divided into data division lengths prespecified by the host 41 by the division control unit 44 and assembled sequentially; 53 is a frame in which a designated line connection unit sends a frame start signal SFD and an error detection signal to the frame; This is a transmission signal that is sequentially sent to the transmission line with the PC8 added.

FIG. 6 is an explanatory diagram showing a data division processing flow in a conventional communication control device.

That is, (1) the division control unit 44 starts data division processing of the transmission data received from the host 41 via the host connection unit 43 using the data division length specified by the host 41 in advance.

■'Determine whether data division is specified for the transmission data received from the host 41,
If ``NO'', proceed to step ■'; if ``NO'', proceed to step ■'.

■' Determine whether "transmission data length > data division length", and if "rYBs", proceed to step ■' and r
If NOJ, proceed to step ■'.

■' Divide the data to be divided in the transmission data using the data division length, assemble it into a frame 52 by adding the communication destination node address D^, the source node address SA, etc., and connect this frame to a fixed line connection. department and proceed to the next step.

(2) Determine whether the data division processing for all data to be divided has been completed. If r YBSJ, proceed to step (2); if "NO", return to step (2).

■' Send the received transmission data as is to the designated line connection section without performing data division processing and proceed to the next step.

■′End the data division process.

Through these steps, the transmission data received from the host 41 is divided into predetermined data division lengths as necessary.

FIG. 7 shows a plurality of frames sent after being divided into data by another communication control device to a line connection unit 45.48.
2 is a diagram illustrating how data is assembled when data is sequentially received by the frame, and the division control unit 44 assembles only the data portion of the frame according to the information on the control area of the frame to obtain the original transmission data.

That is, the line connection units 45 and 48 delete the frame start signal SFD and the error detection signal FC3 from each frame 71 that is sequentially sent, and create a frame consisting only of the (divided) transmission data 72, and the division control unit 44 give it to Then, the division control unit 44 assembles only the data part of the transmission data according to the information of the control area of the (divided) transmission data 72 to obtain the original transmission data, and performs control to pass this transmission data to the host 41. Let's do it.

[Problem to be solved by the invention]

As described above, the data division length used in the data division process in the division control unit of the conventional communication control device is specified in advance as a constant length by the host.

As this fixed length, the smallest value among the maximum transfer data lengths determined for the transmission path to which each line connection section is connected is used. Therefore, the communication control device was able to execute data division processing for any transmission path without being aware of the maximum transfer data length.

However, this data division method has problems such as the data division length of the communication control device being the shortest among the maximum transfer data lengths of each transmission path, and the amount of processing at the line connection section increasing. .

In other words, in a line connection section that can transfer transmission data with a data length longer than the specified data division length at once, the division control section divides the transmission data into multiple pieces even if the transmission data can be transferred at once. It is necessary to perform transfer processing for each assembled frame, and even when receiving a frame, even if the data length is receivable in -degrees, reception processing is required multiple times.

Furthermore, if the transmission data passed from the host connection is long, the number of frames sent on the transmission path will increase, putting more load on the transmission path than necessary. There is a problem in that information other than transmission data, such as signals and error detection signals, increases more than necessary, reducing the efficiency of using the transmission path.

Therefore, in the present invention, the address of each line connection unit and the data division length based on the maximum transfer data length specified for the transmission path to which the line connection unit is connected are registered in the division control unit in association with each other. A division control table is provided, and at the time of transmission, the data division length of the destination transmission path is determined from the division control table based on the address, and the transmission data received from the host is automatically divided as necessary using the data division length. The purpose is to efficiently transfer data by assembling each into a frame and sequentially passing each assembled frame to the next line connection unit for transmission.

[Means to solve the problem]

The present invention provides a communication control device equipped with line connection sections each connected to a transmission path having a different protocol.
A division control table is created in which the address of each line connection unit is registered in association with the data division length, and the data division length determined from the division control table based on the address of the line connection unit sent from the host is used to transmit data. This is a data division method that automatically divides the data into the optimal transfer data length depending on the transmission path of the transfer destination.

FIG. 1 is a diagram explaining the principle of the present invention.

In the figure, 1 is a host, which exchanges data with a host connection section of a communication control device.

Reference numeral 2 denotes a communication control device, which includes a host connection section, a division control section, and a plurality of line connection sections.

3 is a host connection unit that controls the interface of the host 1;

4 is a division control unit that automatically divides the data to be divided in the transmission data sent from the host into the optimal transfer data length according to the transmission path of the transfer destination.

5 is a division control table provided in the division control unit, in which the address (port number) of each line connection unit and data division length are registered in association with each other.

Reference numeral 6 indicates a plurality of line connection units, each of which is connected to a transmission path having a different protocol.

7.8 is a transmission line, which is a bus type, ring type, etc.
It constitutes N.

9.10 are terminals, respectively bus type LAN,! J
connected to a single-channel LAN.

As described above, the communication control device 2, which is the subject of the present invention, includes a host connection section 31, a division control section 4, and a plurality of line connection sections 6, and the division control section 4 is provided with a division control table 5.

The processing procedure at the time of transmission in the communication M1B device 2 is as follows.

That is, ■ The host 1 transfers data via the host connection unit 3,
The port number indicating the address of the line connection unit (connected to the transfer destination transmission line) is sent to the division control unit 4.

(2) The division control unit 4 obtains the data division length from the division control table 5 based on the address received from the host 1.

■ Using this data division length, the division control unit 4 divides the data portion to be divided of the transmission data received from the host as necessary and assembles each into a frame (second frame).
(see figure), and sequentially passes each assembled frame to the line connection specified by the address from the host.

■ The line connection unit 6 that receives this frame adds a frame start code (SFD) to each frame, as in the past.
and an error detection code (Fe2) are added and sent out sequentially onto the transmission path.

It is performing such processing.

In addition, the specification of each data division length in the division control table 5 is as follows: - First, when initializing the communication control device 2, the type (protocol) of the transmission path connecting the line connections is associated with the address of each line connection.・Before starting data transfer, the host 1 retrieves this registered content via the host connection unit 3 and determines the optimal data division length for each address. Next, each of these data division lengths is notified to the division control unit 4 via the host connection unit 3 in address units and registered in the division control table 5.

[Effect]

The present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 2 is an explanatory diagram showing how data is divided by the division control unit 4 when data is transferred from the host 1 to the terminal 9.

In the figure, 21 is data passed from the host 1 to the division control unit 4 via the host connection unit 3, and the address ``0'' indicates the port number of the line connection unit connected to the transmission path of the transfer destination.
0'' and the transmission data, and 22 divides the data portion of the transmission data to be divided using the data division length ``m bytes'' obtained from the division control table 5 based on the address ``00''. It is made up of multiple assembled frames. Furthermore, the contents of the transmission data themselves are the same as those of the conventional method.

The number of divisions at this time is determined by executing an operation in the division control unit 4 to divide the division target data length received from the host 1 by the data division length "m bytes" calculated from the division control table 5.

In addition, the line connection unit 6 sequentially receives a plurality of frames sent after the data has been divided by another communication control device, and the division control unit 4 receives the data of the frame according to the information in the control area of the frame. Data assembly when only the parts are assembled to obtain the original transmission data is the same as the conventional method.

〔Example〕

The present invention will be described in detail with reference to FIG.

FIG. 3 is an explanatory diagram showing the data division processing flow of the present invention.

In other words, ■'The division control unit 4 connects the host 1 via the host connection unit 3.
It receives the transmission data and the address of the line connection unit connected to the transfer destination transmission path from the transfer destination, and starts data division processing.

■' Determine whether data division is designated for the transmission data received from the host 1. If rYBsJ, proceed to step ■'; if "No," proceed to step ■'.

■'Divide based on the address received from host 1.

After finding the data division length from the control table 5, proceed to the next step.

■' Determine whether "transmission data length > data division length", and if rYEsj, proceed to step ■';
If NO, proceed to step ■'.

■' Divide the data to be divided in the transmission data using the data division length, assemble it into a frame 22 by adding the communication destination node address OA, source node address SA, etc., and send this frame to the designated line connection point. and proceed to the next step.

(2) Determine whether the data division process for all data to be divided has been completed. If r YBSJ, proceed to step (2); if "NO", return to step (2).

■' Send the received transmission data as is to the designated line connection section without performing data division processing and proceed to the next step.

■′End the data division process.

Through these steps, the transmission data received from the host 1 is automatically divided into optimal data division lengths determined from the division control table 5 based on the address received from the host 1.

〔Effect of the invention〕

The present invention provides a communication control device that includes a plurality of line connections each connected to a transmission path with a different protocol, and transfers data portions to be divided of transmission data received from a host according to the destination transmission path. Since the configuration is such that the data is automatically divided optimally according to the data length, the amount of processing in the line connection section 1 division control section does not increase more than necessary, and data can be transferred efficiently.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is an explanatory diagram showing how data is divided according to the present invention, Fig. 3 is an explanatory diagram showing the data division process flow of the present invention, and Fig. 4 is an explanatory diagram showing the data division processing flow of the present invention. An explanatory diagram showing an overview of the control device, Fig. 5 is an explanatory diagram showing the state of conventional data division, Fig. 6 is an explanatory diagram showing the conventional data division processing flow, and Fig. 7 is an explanatory diagram showing the state of general data assembly. FIG. In FIG. 1, 1... host 2... communication control device 3...
・Host connection section 4...Division control section 5...Division control table 6...Multiple line connection section 7.8...Transmission path 9.10...Terminal

Claims (2)

[Claims] (1) A host connection section that controls the interface with the host, a plurality of line connection sections each connected to a different transmission path, and data provided between the host connection section and the plurality of line connection sections. In a communication control device equipped with a division control unit that performs division processing, the division control unit is provided with an address of each of the line connection units and a maximum transfer data length specified for the transmission path to which the line connection unit is connected. A division control table is provided in which data division lengths based on the data division length are registered in association with each other, and when the division control unit receives the address of the line connection unit and the transmission data from the host via the host connection unit, The data division length is originally determined from the division control table, the data division target data portion of the transmission data received from the host is divided as necessary using the data division length, and each of the assembled frames is assembled into a frame. A data division method in a communication control device, characterized in that data is sequentially passed to the line connection unit for transmission. (2) To specify each data division length in the division control table, register the type of transmission path that connects the line connections to the address of each line connection in the division control table, and then start data transfer. Beforehand, the host retrieves this registered content via the host connection to determine the optimal data division length for each address, and then divides each of these data division lengths in units of addresses via the host connection. 2. The data division method in a communication control device according to claim 1, wherein the data division method is performed by notifying a control unit and registering the data division in a division control table.