JPH03145845A - Communication control system - Google Patents

Abstract

PURPOSE:To improve high speed and response of a communication system by providing offset word number information and readout word number information to a text readout command and incorporating a function sending only a data of a designation area in a received text frame to a computer by the command. CONSTITUTION:A reception text from a communication line 4 is received by a communication line side control section 9 and text is converted into a prescribed timing and format and result is reported to an arithmetic processing section 5 via an internal interface bus 10. The arithmetic processing section 5 sends only a data in an area designated by an offset word number NO and read word number NR by a read command in a received text frame stored in a reception buffer of a data storage section 7 via an internal interface bus 10, a computer side control section 8 and a computer interface bus 31 to a computer 11.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a communication control method for a communication system that connects and communicates between computer systems, and particularly to speeding up data transfer between a computer and a communication control device. and a communication control method suitable for improving efficiency.

[Conventional technology]

In a conventional communication system that connects and communicates between computer systems, the data transfer method between a computer and a communication control device is that in response to a text read command from the computer, the communication control device reads the received text frame stored in the data storage unit. The general method is to send all data to the computer from the beginning of the text, and delete unnecessary data depending on the type of text etc. after the computer reads it from the communication control device.% [Problem to be solved by the invention] The above-mentioned conventional technology does not consider speeding up and improving the efficiency of the data transfer method between the computer and the communication control device of the communication system that connects and communicates between computer systems. It is an object of the present invention to provide a communication control system that eliminates the drawbacks of the prior art.

[Means to solve the problem]

In order to achieve the above purpose, when receiving text sent by a communication control device of the other party, offset word count information and read word count information are provided in the text read command issued from the computer to the communication control device, and each communication control device receives one command. It has a built-in function to send only data in a specified area in a text frame to a computer.

[Effect]

According to the above means, when receiving a text transmitted by the communication control device of the other party, the offset word count information and the read word count information provided in the text read command issued from the computer to the communication control device and the command provided in the communication control device are interpreted. , the communication control device responds to a request from the computer to read an arbitrarily specified area in the received text frame by a program that sends only the data in the specified area in the received text frame stored in the data storage unit to the computer. Only data in an arbitrarily designated area can be selected from the received text frame stored in the data storage section and sent to the computer.

〔Example〕

An embodiment of the present invention is shown in FIGS. 1, 2, and 3.

This will be explained with reference to FIGS. 4 and 5. FIG. 1 is an overall configuration diagram showing communication control devices 21 to 2 connected to computers 11 to 1n via computer interface buses 31 to 3n.
Each computer system constituted by n is connected to each other by a communication line 4. With such a configuration, a communication system for communicating between computer systems is formed. Communication control device 21 here~
2n is the computer 11-1. , and has the functions of controlling data transmission and reception with the communication line 4. In addition, as for control during text reception, after receiving text and storing it in the reception buffer, it issues status information such as the text type and total number of received text data (NT) and a read request interrupt to report the text reception to the computer. , the read command from the computer and the read command as required, such as the data transfer area on the computer, the offset word count No., the read word count NR, etc., are received and interpreted, and only the specified data is sent to the computer. Under the above conditions, Figure 2 is a block diagram of a communication control device for a computer system in Figure 1 which shows an embodiment, Figure 3 is a format diagram of a text reading command from a computer which shows an embodiment, and Figure 4 is a diagram of a command format for reading text from a computer. A detailed circuit configuration and operation will be explained using a text frame reception buffer format diagram in a communication control device showing an embodiment, and a communication control processing flow diagram when receiving text in a communication control device showing an embodiment in FIG. 5. Here, the description will be made assuming that the communication control device 21 receives text. In the block diagram of FIG. 2, the computer interface bus 31 is connected to the computer side control section 8, and the communication line 4 is connected to the communication line control section 9. These computer-side control section 8 and communication line-side control section 9 are connected to the arithmetic processing section 5 via an internal interface bus 10. In addition, the arithmetic processing section 5 includes a program storage section 6. The data storage section 7 is also connected via the internal interface bus 10, and zero or more are the configuration of the communication control device 21 of the computer system of FIG. 1, which shows the embodiment shown in FIG. With the above circuit configuration, the communication control device 21 of the computer system receives the sending command and transmission data from the computer 11 via the computer interface bus 31 by the computer side control unit 8, and processes them via the internal interface bus 10. Report to Department 5. The arithmetic processing unit 5 interprets the transmission command command using a program stored in a program storage unit 6 in which a program for performing predetermined transmission control processing is stored in advance, and a data storage unit 7 that temporarily stores transmitted and received data.

The transmission data is converted into a format at a predetermined timing and format by the communication control section 9, and is transmitted to the communication line 4 as a transmission text. On the other hand, text received from the communication line 4 is received by the communication line side control unit 9, converted into a predetermined timing and format, and reported to the arithmetic processing unit 5 via the internal interface bus 10.

The arithmetic processing section 5 stores the received text in the reception buffer of the data storage section 7 according to a program stored in the program storage section 6 in which a program for carrying out predetermined reception control processing is stored in advance, and transfers the received text to the computer interface bus using the computer side control section 8. 31 to the computer 11 to issue status information such as the text type and total number of received text data (NT) as well as read request interrupts, report the text reception to the computer 11, and issue a read command from the computer 11 and a read request interrupt to the computer 11. The computer-side control unit 8 receives read commands such as the data transfer area, offset word count No., read word count NR, etc. as necessary via the computer interface bus 31, and reports them to the arithmetic processing unit 5 via the internal interface bus 10. do. The arithmetic processing unit 5 interprets the data in the received text frame stored in the reception buffer of the data storage unit 7 using a program stored in a program storage unit 6 in which a program for performing communication control processing when receiving a predetermined text is stored in advance. , only the data in the area specified by the offset word number No. and read word number NH by the read command is transferred to the internal interface bus 1.
0. Computer side control unit 8゜Computer interface bus 3
1 to the computer 11. FIG. 3 shows a format diagram of a text reading command issued from the computer 11 to the communication control device 21 when receiving a text transmitted by the communication control device of the other party, which shows an example of the above, and shows an address m and an address in this read command format. It is assumed that offset word number information No and read word number NR are respectively provided for n. FIG. 4 shows an example of the above-mentioned embodiment. When receiving a text sent by the other party's communication control device, the communication control unit! !
21 shows the text frame reception buffer format diagram stored in the reception buffer in the data storage unit 7. From the total number of received text data NT in this reception buffer, the offset number of words No. and Interpret the number of read words NR, receive buffer address No.+1 to receive buffer address No.
Only text data No.+1 to text data N□+NR stored in +NR can be sent to the computer 11. FIG. 5 shows a communication control processing flow diagram when text is received in the communication control device 21 according to the above-mentioned embodiment. It then issues status information such as the text type and total number of received text data (NT) and a read request interrupt to report text reception. Receives and interprets the read command from the computer 11 as well as the offset word number No., read word number NR, etc. as necessary, and calculates the offset word number N.
If o≠0.

Set the transmission start address No.+1 of the reception buffer in the transmission address register. If the number of offset words No. is O, the sending start address 1 of the receive buffer is set in the sending address register. Further, as for the number of read words NR, NR is set in the sending count register. After this processing, data is sent from the receive buffer address according to the contents of the send address register, and after sending, the contents of the send address register are updated by +1, and the contents of the send count register are updated by -1.
By updating and repeating this operation until the contents of the sending count register become O, it is possible to send only the data of the designated area from the computer 11. According to the above-mentioned embodiment, the computer 11 can handle only the data that is necessary depending on the type of text, etc., thereby improving the speed and responsiveness of the communication system that connects and communicates between computing systems. A communication control method that eliminates the drawbacks of the prior art can be realized.

〔Effect of the invention〕

According to the present invention, by using a simple circuit configuration and a communication program when receiving a text read command, only data that is necessary depending on the type of text can be handled in data transfer between a computer and a communication control device. It is possible to reduce data transfer time, eliminate the need to delete unnecessary data after reading it from the communication control device by the computer, and improve the speed and responsiveness of the communication system that connects and communicates between computer systems. can.

[Brief explanation of the drawing]

Figure 1 is an overall configuration diagram, Figure 2 is a block diagram of the communication control device of the computer system in Figure 1, Figure 3 is a format diagram of a text read command from the computer, and Figure 4 is text frame reception within the communication control device. The buffer format diagram and FIG. 5 are communication control processing flow diagrams at the time of text reception within the communication control device. 11-1n... Computer, 21-2n... Communication control device, 31-3n... Computer interface bus, 4
... Communication line, 5 ... Arithmetic processing section, 6 ... Program storage section, 7 ... Data storage section, 8 ... Computer side control section, 9 ... Communication line side control section, 1o ...Internal interface bus, No....Offset word count, NR
...Number of words read, 1st ward, 2nd figure, 3rd figure, 5th figure

Claims (1)

[Claims] 1. A computer, a program storage unit that stores a predetermined program, a data storage unit that temporarily stores transmitted and received data and control information, and a computer-side control unit that controls data transfer with the computer; In a communication system in which a communication line side control unit that controls text transmission and reception with another computer system and a communication control device consisting of an arithmetic processing unit that integrates and controls these are connected via a computer interface bus to perform communication, communication with the other computer system is performed. When receiving text transmitted by the control device, offset word count information and read word count information are provided in the text read command issued from the computer to the communication control device, and the communication control device interprets the command and stores the received text in the data storage unit. A communication control method characterized in that a program for sending only data in a designated area in a frame to a computer is provided in a program storage unit. 2. In claim 1, a communication control program that includes a program that interprets a text read command from a computer and sends only data in a specified area of a received text frame stored in a data storage unit to the computer is transmitted from the computer to the communication control device. A communication control method characterized in that it is possible to write to an internal program storage section. 3. A method for manufacturing a communication control device, characterized in that the communication control device implementing the communication control method according to claim 1 is mounted on a printed wiring board. 4. An instrumentation system that performs process control by interconnecting functionally distributed computer systems, characterized in that information necessary for process operation, operation, monitoring, etc. is exchanged by the communication control method of claim 1. Communications system.