JPH0556108A - Data communication terminal equipment - Google Patents

Abstract

PURPOSE:To supply a data communication terminal equipment which can easily store the change of the status of a communication port without the need of the other private unit for storing the status of the communication port and which can minutely analyze the change of the status of the communication port. CONSTITUTION:A read means (communication status read part) 11 reads the status of the communication port 5 at every prescribed time by a timer 12. The status of the communication port 5, which is read, is written into a main storage means (communication status storage part) 13. A write means (communication status write part) 14 writes the status of the communication port 5, which is written into the main storage means 13, into an auxiliary storage means (auxiliary storage device) 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data communication with a host computer device via a communication port, and more particularly to a data communication terminal device for controlling communication processing between the two by changing the status of the communication port.

[0002]

2. Description of the Related Art In a conventional data communication terminal device, there is no means for storing the status of a communication port, and another dedicated device is connected to check the status of the communication port.

[0003]

Therefore, in the conventional data communication terminal device, another dedicated device is required to know the status of the communication port, and moreover, the current status can be known for a certain period of time. It was not possible to memorize the status of the communication port for each and then analyze the change in the status of the communication port in detail to verify the program.

The present invention has been made in view of the above circumstances, and does not require any other dedicated device for storing the status of the communication port, and further, stores the status of the communication port at regular intervals, It is an object of the present invention to provide a data communication terminal device capable of later performing detailed analysis of changes in the status of the communication port and verifying a program.

[0005]

In order to achieve such an object, the present invention provides a data communication terminal device for performing data communication with a host computer device through a communication port,
Main storage means for storing the status of the communication port,
A reading unit that reads the status of the communication port at a fixed time by a timer and writes the status in the main storage unit, and an auxiliary storage unit that stores the status of the communication port read by the reading unit and written in the main storage unit. And a writing means for writing the status of the communication port stored in the main storage means into the auxiliary storage means.

[0006]

The reading means reads the status of the communication port at regular intervals by the timer, writes the read status of the communication port to the main storage means, and writes the status of the communication port written to the main storage means. The data is written in the auxiliary storage means by the inserting means. This makes it possible to analyze the change in the status of the communication port in detail and verify the program later.

[0007]

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

FIG. 1 is a block diagram of a data communication terminal device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a data communication terminal device having a terminal control unit 2. The terminal control unit 2 controls the entire terminal device 1. An input device 3 such as a keyboard is connected to the terminal control unit 2 via an input control unit 4. This input control unit 4
Controls the input device 3.

A communication port 5 is connected to the terminal control unit 2 via a communication control unit 6. The communication port 5 is connected to the host computer device 8 via a communication line 7. The communication control unit 6 controls the communication processing of the terminal device 1. The terminal controller 2 includes an output controller 9
The output device 10 is connected via. The output control unit 9 controls the output device 10.
0 is a display device or the like.

A communication status reading unit (reading means) 11 is connected to the communication port 5. This reading unit 11
Is for reading the status of the communication port 5 by the timer 12 at regular intervals and writing it in the communication status storage unit (main storage means) 13. The timer 12 and the communication status storage unit 13 are connected to the reading unit 11. A communication status writing unit (writing means) 14 is connected to the communication status storage unit 13. This writing unit 1
Reference numeral 4 is for writing the data to the auxiliary storage device (auxiliary storage means) 15 when the communication status storage unit 13 has the data. The auxiliary storage device 15 is a magnetic disk, an optical disk, or the like, is connected to the writing unit 14 via the auxiliary storage control unit 16, and is controlled by the auxiliary storage control unit 16. Further, the auxiliary storage control unit 16 is connected to the terminal control unit 2.

Next, the processing procedure of the data communication terminal device 1 of the present invention will be described with reference to the flowcharts of FIGS. 2 and 3.

First, in the initialization process when the power of the terminal device 1 is turned on, the processing time interval of the communication status reading unit 11 activated by the timer 12 can be set in millisecond units.

First, the processing procedure of the communication status reading unit 11 will be described with reference to FIG.

The communication status reading unit 11 includes a timer 1
2 is activated at regular time intervals, and is preferentially processed by the communication status writing unit 14.

First, in step 1, the communication port 5
Read the status of. Next, in step 2, it is checked whether or not the access flag indicating that the communication status storage unit 13 is being accessed and cannot be used is ON. If it is on, the process proceeds to step 3 to turn on the access request flag to allow preferential access, and then returns to step 2 to repeat the above-described processing until the access flag is turned off (OFF).

If the access flag is off in step 2, the process proceeds to step 4, the access request flag is turned off, and in the next step 5, the access flag is turned on to perform exclusive control.

Then, in the next step 6, the status of the communication port 5 read in step 1 is written in the communication status storage unit 13. As shown in FIG. 4, the data structure of the communication status storage unit 13 can store eight signals in one byte. Then, after the status of the communication port 5 is written in the communication status storage unit 13 in step 6, the access flag is turned off in step 7, and this processing operation is ended.

Next, the processing procedure of the communication status writing unit 14 will be described with reference to FIG.

First, in step 11, it is checked whether or not there is data to be written in the auxiliary storage device 15 in the communication status storage unit 13. If it does not exist, this step 11 is repeated until it exists. If so, the process proceeds to the next step 12 to check whether or not the access flag is on. If the access flag is on,
Repeat step 12 and wait until the access flag is turned off. If the access flag is off, the process proceeds to the next step 13 to turn on the access flag and perform exclusive control.

Then, in the next step 14, after writing the data in the communication status storage unit 13 in blocks from the oldest one to the auxiliary storage device 15, step 15
Proceed to and check whether all the data has been written.
If there is data that has not been written yet, the process proceeds to the next step 16 to check whether or not the access request flag is on. If the access request flag is not on, that is, if it is off, the process returns to step 14 and the writing is repeated again.

If the access request flag is on, it means that the communication status reading unit 11 has made an access request. Therefore, after interrupting the writing, the process proceeds to step 17 to turn off the access flag, and then the above-mentioned. Returning to step 11, the above-mentioned processing is repeated. When all the data is written in step 15 above, step 16 is not executed and step 17
Proceed to.

In the above embodiment, as shown in FIG. 4, the data structure of the communication status storage unit 13 is 1 byte. That is, eight signals can be stored.

However, as shown in FIG. 5, by expanding the data structure of the communication status storage unit 13 to 2 bytes or more, it is possible to store all the signals of the communication port 5 equipped in the terminal device 1. It will be possible.

[0024]

As described above, according to the data communication terminal device of the present invention, it is possible to easily change the status of the communication port without needing any other dedicated device for storing the status of the communication port. Can be remembered, and
Since continuous recording can be taken at regular time intervals, detailed analysis of changes in the status of the communication port enables program verification and the like.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a data communication terminal device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of a communication status reading unit in the data communication terminal device shown in FIG.

FIG. 3 is a flowchart showing a processing procedure of a communication status reading unit in the data communication terminal device shown in FIG.

FIG. 4 is a data structure diagram of a communication status storage unit in the data communication terminal device shown in FIG.

FIG. 5 is a data structure diagram of a communication status storage unit in a data communication terminal device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 data communication terminal device 5 communication port 8 host computer device 11 communication status reading unit (reading unit) 12 timer 13 communication status storage unit (main storage unit) 14 communication status writing unit (writing unit) 15 auxiliary storage device (auxiliary) Storage means)

Claims (1)

[Claims] 1. In a data communication terminal device for performing data communication with a host computer device via a communication port, main memory means for storing the status of the communication port, and a timer for reading the status of the communication port at regular intervals. Reading means for writing in the main storage means, auxiliary storage means for storing the status of the communication port read by the reading means and written in the main storage means, and the communication stored in the main storage means A data communication terminal device, comprising: writing means for writing the status of the port into the auxiliary storage means.