JPS62130447A - Communication data reception system by inter-character time supervision - Google Patents

Abstract

PURPOSE:To receive a data without putting a big load on a host computer and without making worse a response by continuing a reception when the next data is received within a prescribed time, terminating a reception process when it is not received within the prescribed time, and performing the process of the data received until then in a data reception time. CONSTITUTION:The data inputted from a keyboard 6 is sent to a host computer CPU1 through an adaptor 3. At such a time, when a read command is not issued from the CPU1 to the adaptor 3, a reception data is stored at a buffer. And when the data is transferred from the buffer to the CPU1, a timer is started up to supervise a time between characters. Also, when the read command is issued, the timer is canceled when it is in operation, and the data is transferred to the CPU1 as it is. And the timer is started up again to supervise the time between the characters, and the read command is terminated when a time-out is generated.

Description

[Detailed Description of the Invention] [Summary] In non-procedure data communication, this is a method for efficiently performing data reception processing by monitoring short periods of time between received characters.

[Industrial application field]

The present invention relates to a reception method for non-procedural data communication.

[Prior art and problems]

When performing data communication using a TTY procedure or the like, in order to perform detailed control over the other party's terminal, it is necessary to request an external device such as an adapter to receive data one byte at a time. However, this method imposes a heavy load on the host computer, which poses a problem when used for file transfer, etc.

In order to solve this problem, the following methods have been considered.

(a) Reception by delimiter specification Specify a delimiter character and request the adapter to receive data up to the delimiter character as one record.

This method does not allow fine character-by-character control over the terminal, and cannot be applied to binary file transfers.

fb) Batch transfer of data by adapter The adapter checks whether there is received data at regular intervals and transfers the received data all at once.

Can this method control low speed small lines? A III adapter will not be effective. If you try to increase the effectiveness of this method with a low-speed small line adapter, you will need to increase the check cycle,
A minimum amount of data transfer is required, which worsens the response of this system.

[Purpose of the invention]

The present invention is based on the above considerations, and provides a communication data reception method that allows data to be received without increasing the load on the host computer and without deteriorating the response in non-procedural data communication. It is intended to.

[Means to achieve the purpose]

Therefore, the communication data reception method using character interval time monitoring according to the present invention is characterized by the following features.

- When receiving data, monitor the time from when one character is received until the next data is received.

- If the next data is received within a certain period of time, reception continues,
Start a new time monitor. - If the next data is not received within a certain period of time, the reception process is terminated and the data received so far is processed.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 is a diagram showing an example of a system to which the present invention is applied. 1st
In the figure, 1 and 2 are host computers, 3 and 4 are adapters, 5 is a display, and 6 is a keyboard, respectively. The display 5 and keyboard 6 constitute a conversation terminal.

For example, when data is input from the keyboard 6, these data are sent to the computer 1 via the adapter 3, the computer 1 processes these data, and the processing results are sent to the display 5 via the adapter 3. , shown on the display screen. File transfer and the like are performed between computers 1 and 2.

Adapters 3 and 4 have the same configuration.

FIG. 2 is a diagram showing an example of the configuration of the adapter.

In Figure 2, 7 is the read counter and 8 is the host counter.
Reference numeral 9 indicates a read command execution display section, 10 a communication control section, 11 a buffer, 12 a buffer counter, 13 a timer control section, and 14 a timer operation display section. The operation of the adapter is as follows.

■ Received data when a read command is not issued is stored in H-7.

■ When a read command is issued, data is transferred from the buffer to the host computer.

■ When data is transferred from the buffer to the host computer, a timer is started to monitor the time between characters.

■ If data is received while a read command is issued, the timer is canceled if it is running.

■ Data received while a read command is issued is transferred to the host computer as is.

■ If the read command continues, start the timer again to monitor the time between characters.

■ Terminate the read command if a timeout occurs.

FIG. 3 is a diagram for explaining time monitoring between characters.

In FIG. 3, TG represents the character amount non-communication time, T represents the character transfer time, T8 represents the character interval time monitoring target time, and T represents the character interval time monitoring instruction value. T1. l<T3
When , data reception is reduced to mVt, and when T≧T3, reception is terminated. In addition, 'rw = TG +'l
'B, and Ts is several 10m5ec to 100m
It is set to about 5ec.

FIG. 4 is a diagram illustrating timeout processing of the timer control section.

■ Cancel the timer operation display.

■ Cancel the read command execution display.

■ Perform final processing of read commands.

FIG. 5 is a diagram illustrating the read command reception process of the host interface unit.

■ Set the read command execution display.

■ Check to see if there is data in the buffer. Y
If es, process (■) is performed, and if NO, the process ends.

■ Check whether the value of the read counter is greater than zero. If Yes, process ■; if NO, process ■
Process.

■ Check whether the value of the buffer counter is greater than zero. If YES, process ``■'' is performed, and if NO, process ``■'' is performed.

■ Transfer data from the buffer to the host computer.

■ Set the read counter and buffer counter values to -
Do 1. Next, perform the process (■).

■ Set the timer operation display.

■ Start a timer for monitoring the time between characters.

■ Cancel the read command execution display.

[Phase] Perform finalization processing of the read command.

FIG. 6 is a diagram illustrating data reception processing by the communication control section.

■ Check whether a read command is in progress. If Yes, process ``■'' is performed, and if No, process [Phase] is performed.

■ Check whether the timer is operating. If Yes, process (2) is performed, and if No, process (2) is performed.

■ Cancel the timer operation display.

■ Cancel the timer.

■ Send data to the host computer.

■ Decrease the read counter value by 1.

■ Check whether the value of the read counter is greater than zero. If Yes, process ■, if No, 0
Process.

■ Set the timer operation display.

■ Start a timer for monitoring the time between characters.

[Phase] Store data in the buffer.

■ Add 1 to the buffer counter.

■ Cancel the read command execution display.

■ Perform read command finalization processing.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, when a terminal is connected at the end of a line, the terminal operator can receive detailed control from the host computer without being bothered by processing delays. , and when a computer is connected at the end of the line, efficient data transfer can be performed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a system to which the present invention is applied;
Figure 2 is a diagram showing an example of the configuration of the adapter, Figure 3 is a diagram to explain the time monitoring between characters, Figure 4 is a diagram to explain timeout processing of the timer control section, and Figure 5 is a diagram to explain the timeout process of the timer control section.・
FIG. 6 is a diagram illustrating the read command reception process of the interface section, and FIG. 6 is a diagram illustrating the data reception process of the communication control section. 1 and 2...calculator, 3 and 4...adapter, 5...
Display, 6... Keyboard, 7... Lead
Counter, 8...Host interface section, 9...
- Read command execution display unit, 10... Communication control unit, 1■... Buffer, 12... Buffer counter, 13... Timer control unit, 14... Timer operation display unit.

Claims (1)

[Claims] In non-procedural data communication, if data is received while executing a read command issued by the host computer, the data is sent to the host computer, and if the timer for monitoring the time between characters is running, the initial After setting the value, start the timer, and if the timer is not running and the count value is the initial value, start the timer immediately, and when the timer counts a certain amount of time, complete the read command finalization process. A communication data reception method using character interval time monitoring.