JPS62254253A - Continuous reception system for data with indefinite length - Google Patents

Abstract

PURPOSE:To transfer the continuous input data to a host device just with a single read command by defining the end of a command when no data is received for a fixed period of time. CONSTITUTION:An I/O instruction, e.g., a read command for reception of data given from a circuit is received by an interface control part 2-1 from a host device. Then an instruction is given to a data receiving part 2-2 for the reception of data. A detecting part 2-3 detects a text end code while receiving data. When the test end code is detected, the synchronization of characters is released and the characters are waited for to set up the next synchronization. Then a timer 2-4 is actuated to monitor the input of data and the end of the command is decided when no input is given for a prescribed time (10sec, etc.). Thus it is possible to decrease the number of data receiving buffers within the host device.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to communication control in an online system and is a communication control device suitable for a transmission control procedure in which text is continuously transmitted from a terminal device in 1% of the time. [Prior art] Regarding the continuous reception method, a conventional device receives data that is continuously input from a line and receives one text in response to a READ command from a host. However, no consideration was given to transferring continuous input data to the post with a single REND command. Note that the READ command is an I/O command for data reception issued from the host computer to the communication control device. Incidentally, related methods of this type include, for example, Japanese Patent Application Laid-open No. 58-0554.
There are publications such as Publication No. 4.

[Problem that the invention seeks to solve]

In the above conventional technology, it is necessary to reserve data according to the maximum length of the undefined length data input to the buffer in the host, and there is no consideration given to the amount of memory in the host. I had a problem where I had to increase the amount.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the amount of memory required by the host by making it possible to prepare the amount of memory in the host equal to the total length of all text from the line.

[Means for solving problems]

The above purpose is to send text that is continuously input in a communication control device connected to a host to an REA for reception from the host.
This is achieved by controlling the communication control device so that it can be received with one D command.

[Effect]

The overload control device according to the present invention operates to receive frames that are continuously sent over a line in response to a single READ command from the host, and transfer them to the host as continuous data. This eliminates the need for the host to prepare buffers for the number of frames that correspond to the maximum frame length, and the memory within the host can be used effectively.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a system configuration to which the present invention is applied. Communication control device f11 from the terminal device 4 via the modem device 5
Connected to 2. Furthermore, a host (electronic computer) 1 is connected to the communication control device 2 . When the terminal device 4 generates data, it transmits it as one text up to the end code 8. 1
The text length is not fixed (it ranges from short to long. The maximum text length and number of texts are determined when the system is constructed.

FIG. 2 shows the data input situation and the required amount of the host buffer 7 when the present invention is applied. In the case of FIG. 2, it is sufficient that the buffer 7 in the host has the total length of data input to the system. To achieve this, a single READ command for data communication is issued from the host 1 to the communication control device 2 in FIG.
A READ command is issued with a byte count greater than the total number of bytes of text 1 to n, and communication control device 2 issues SYN=? If the end code of one text is detected so that the texts 1 to n starting with Yarakuta are successively received, if it is 8YN synchronization, the synchronization is released and the system waits for the 8YN character. Transfers the first character of the next text in succession to the previous text.

The command ends when no data is received for a certain period of time (for example, /O seconds).

FIG. 3 shows a block diagram of a communication control device 2 to which the present invention is applied. Reference numeral 2-1 denotes an interface control unit that controls the interface between hosts, and controls command reception, data transfer, command termination, etc. 2-2 is a data receiving unit that receives data from the line, including a part that synchronizes 8YN, 2-5 is a detection unit that detects the end code, and 2-4 is a data receiving unit that detects the end code. Terminate the command with a timer that monitors input.

The operation of the communication control device to which the present invention is applied will be explained below. First, the interface control unit 2-1 shown in FIG. 3 receives an I/O command (for example, a READ command) from the host to instruct the reception of data from the line. After receiving the data, the data communication unit 2-2 is instructed to receive the data. While receiving the data, the detection unit 2-5 checks whether the ending code is 8 or not. When the end code 8 is detected, the synchronization of characters is removed and the next character for establishing synchronization is waited for. At this time,
A timer that monitors data input to timer 2-4 is operated, and the command is terminated when there is no more input. According to this embodiment, it is possible to reduce the memory of the host.

[Effects of the Invention] According to the present invention, it is possible to reduce the number of data reception buffers in the host, thereby reducing the amount of memory in the host.

Example (1) Before implementation, 20 x 20 text = 400
After implementation of 7 lines (2): 20 texts 1 digit 1 text 5 digits 0.5 text 5 digits α2KB text Assuming 9 lines, 20 + IX5 + α5X5 + 0.2X9 = 29.5KB/line

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention, FIG. 2 is a diagram showing a take reception method and a host buffer management method according to the present invention, and FIG. 3 is a diagram of a communication control device to which the present invention is applied. It is a block diagram. 1...Host (electronic computer). 2... Communication control device, 3... Modulation/demodulation device. 4...Terminal device, 5...Test Φ. 7...Buffer, 8...End code. 2-1...Interface control unit. 2-2...Data reception section, 2-3...End code detection section. 2-4...Timer monitoring section, Figure 1 Tower Figure 2 Area B

Claims (1)

[Claims] 1. A communication control device for an online system consisting of a computer, a communication control device, and a terminal device connected through a line, where the transmission control procedure is synchronized using a specific character, and the text length is If the end of the text is not fixed and consists of the end code of a specific character, and the text is continuously transferred, the communication control device (1) synchronizes with the specific character and receives the data. (2) In a communication control device consisting of a channel control unit that receives I/O commands from a host and transfers data between hosts, a function is provided to detect the end code of a text and the end of a continuous text group. A continuous reception method for a communication control device characterized by: