JPS61292446A - Transmission line control system - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency by adopting the constitution that a transmission line is divided into two independent logical transmission lines, the divided logical transmission lines are used respectively for the input and output and the logical transmission line is made corresponding to an information processor. CONSTITUTION:The logic transmission lines 401, 402 are classified respectively into the input and output and the information processors 100, 200 and 300 perform mutual communication by the transmission/reception of data in a data communication system where one set of the information processor 100 is connected to sets of information processors 200, 300 via transmission lines 400 and 500 respectively. When the information processor 100 sends a data to the information processor 200, a transmission section 121 corresponds a number to a logic transmission line 401 and has a table corresponding the number to a logic name of a data transmission control section 210, then the logic name is converted into a number from the table and the data and its number are given to an input/output control section 130. The input/output control section 130 generates a communication frame.

Description

Detailed Description of the Invention Technical Field The present invention relates to a data transmission path control system in a data communication system for a single or multiple information processing devices, and in particular to a method for controlling input/output processing of a communication control unit by classifying logical transmission paths. This invention relates to a transmission path control method for controlling.

Conventionally, in the transmission processing of this type of information processing device, when there is a transmission request, the destination information processing device notifies the destination information processing device of a transmission request signal. The method used was to issue a reception command to the transmission line.

In the conventional information processing control method described above, the reception command is executed only after a transmission request signal is received from the other party's information processing device, so the reception command is executed after the transmission request signal is detected. It is disadvantageous in that it requires time and reduces transmission efficiency due to the processing time of the received command.

OBJECTS OF THE INVENTION An object of the present invention is to provide a transmission path control method that improves the transmission efficiency in data communication between information processing devices.

Structure of the Invention The logical transmission path control method of the present invention is a data communication system in which a single or multiple information processing devices are connected via a transmission path so that mutual communication can be performed between them. The configuration is such that the logical transmission paths are divided into two independent trees of logical transmission paths, and the divided logical transmission paths are used for input and output, respectively, to make these logical transmission paths compatible with the information processing device. There is.

Example Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a configuration diagram of an information processing device of a data communication system realized by the logical transmission path control method of the present invention.
The information processing devices 100 and 200 are connected via a transmission path 400, and the information processing device 100 has a data transfer control unit 1.
101 has a communication control section 120 and an input/output control section 130, and the communication control section 120 has a transmission section 121 and a reception section 12.
It has 2. The information processing device 200 has a data transfer control unit 2
101 has a communication control section 220 and an input/output control section 230, and the communication control section 220 has a reception section 221 and a transmission section 22.
It has 2. The transmission path 400 has logical transmission paths 401 and 402.

'Figure 2 shows a data communication system in which one information processing device 100 is connected to two information processing devices 200 and 300 via transmission paths 400 and 500, respectively, where logical transmission paths 401 and 402 are input. This is an embodiment in which information processing apparatuses 100, 200, and 300 communicate with each other by transmitting and receiving data using the logical transmission path control method of the present invention.

FIG. 3 and FIG. 4 show information processing devices 100 and 20.
0 is a bus-like and loop-like common transmission line 40, respectively.
0, the logical transmission paths 401 and 402 are classified as input and output, respectively, and the information processing devices 100 and 200 perform data transmission and reception using the logical transmission path control method of the present invention. This is an example of mutual communication.

FIG. 5 shows a communication frame transferred between information processing apparatuses according to this method, and is composed of a header section 610, an information section 620, and a trailer section 630. The header section 610 is composed of a flag 611 and an address 612, the information section 620 is composed of data, and the trailer section 6
30 is made up of flags.

Next, the operation of the present invention will be explained with reference to FIG.

As shown in Figure 1, information processing bags @100 and 20
0, in order to recognize the information processing device of the transmission partner, the data transfer control unit 110
and 210 are associated with logical names. The information processing device 100 recognizes the information processing device 200 of the transmission destination based on the logical name of the data transfer control unit 210, and
0 recognizes the information processing device 100 of the transmission destination by the logical name of the data transfer control unit 110.

A case where the information processing device 100 transmits data to the information processing device 200 will be described. Data transfer control unit 110
sends the logical name and data of the data transfer controller 210 to the transmitter 1
Pass it to 21. Since the transmitter 121 has a table that associates numbers with the logical transmission paths 401 and the logical names of the data transfer control unit 210, it converts the logical names into numbers from this table and converts them into data. The number is passed to the input/output control unit 130. The input/output control section 130 creates a communication frame as shown in FIG.

In other words, a flag indicating the start of the communication frame is incorporated into the header section, a logical transmission path 401 number is incorporated into the address, data passed from the communication control section 120 is incorporated into the information section, and the trailer section indicates the end of the communication frame. Incorporate flags and create communication frames. Logical transmission path 401
Since it has a table that associates the number of the logical transmission path 401 with the transmission path 400, the transmission path 400 is found from the number of the logical transmission path 401, and the created communication frame is sent to the transmission path 400.

A case where the information processing device 100 receives data from the information processing device 200 will be described. Data transfer control unit 11
0 passes the logical name of the data transfer control unit 210 and the area for storing data to the reception unit 122 of the communication control unit 120. Since the receiving unit 122 has a table that associates numbers with the logical transmission paths 402 and associates the numbers with the logical names of the data transfer control unit 210, When the name is passed, the logical name is converted into the number of the logical transmission path 402 from the table, and the area for storing data and its number are passed to the input/output control unit 130.

The human output unit control unit 130 prepares a storage area for communication frames received from the transmission path 400, and when the communication frame is stored in the area, it detects that the communication frame has been received and writes the header section of the communication frame. The number of the logical transmission path 402 is detected from the address. Then, the data is stored in the area passed from the receiving section 122, and is passed along with the number to the receiving section 122.

Since the receiving unit 122 has a table that associates the numbers of the logical transmission paths 402 with the logical names of the data transfer control unit 110, the receiving unit 122 converts the logical names into numbers from the table. Recognizing that the receiving unit 122 has been notified of the data reception request from the processing device 210, the data transfer control unit 11 sends the request to the data transfer control unit 110.
The logical name of 0 and the data passed from the input/output control unit 130 are passed. The data transfer control unit 110 receives data transmitted from the information processing device 200 using data passed from the reception unit.

When the information processing device 200 transmits data to the information processing device 100, mutual communication is performed between the information processing V4 devices 100 and 200 by performing the same process as the data transmission and reception of the information processing bag @100. .

As described above, according to the present invention, transmission paths between a single or multiple information processing devices are classified into logical transmission paths for input and output, and the logical transmission paths correspond to the information processing devices. By attaching the data to the input logical transmission path, when receiving data from the information processing device of the communication partner, the receiving command can always be executed on the input logical transmission path, which has the effect of increasing transmission efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIGS. 2 to 4 are diagrams showing the configuration of a data communication system to which the present invention is applied, and FIG. 5 is a diagram showing communication transferred between information processing devices. FIG. 3 is a diagram showing an example of a frame. Explanation of symbols of main parts

Claims (1)

[Claims] A transmission line control method in a data communication system in which information processing devices communicate with each other via a transmission line, wherein the transmission line is treated as two logical transmission lines that are logically independent from each other, and each of these logical transmissions is controlled. The logical transmission paths are used independently for input and output, and these logical transmission paths are made to correspond to the information processing devices, and one information processing device uses the input logic assigned to the other information processing device. A transmission line control method characterized in that a reception command is issued to the transmission line.