JPS6367389B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a data observation device for observing data transmission status in a data communication network.

BACKGROUND OF THE INVENTION Devices for converting serial data in a data communication network into characters using a prespecified character set and displaying the characters are already known. However, even if the characters of data are simply displayed on the screen of a cathode ray tube (CRT), it is difficult to easily and accurately judge the content and status of data transmission.

OBJECT OF THE INVENTION Therefore, an object of the present invention is to provide a data observation device that can easily observe data transmission contents and status in data communication.

Structure of the Invention To achieve the above object, the present invention includes a buffer memory for storing a certain amount of data in a data transmission path for data communication, and a buffer memory for transferring the data based on the data read from the buffer memory. Analyze the contents of the control section of the data frame, form abbreviation display data corresponding to the contents of the control section, and make this abbreviation display data correspond to approximately one half of the display surface of the display device described later. At the same time as writing into the display memory, character display data corresponding to the entire contents of the data frame corresponding to the abbreviation display data is formed, and this character display data is written so as to correspond to the other approximately half of the display surface. an abbreviation display and character display data generation circuit that writes data into the display memory and generates the abbreviation display data and the character display data from the display memory based on display control; and a data generation circuit that reads data from the display memory. a character generator that generates a character signal corresponding to the abbreviation display data and the character display data based on the input signal; The present invention relates to a data observation device comprising a display device that displays at least an abbreviation corresponding to the abbreviation display data, and displays a character corresponding to the character display data on the other approximately half of the display surface.

Effects of the Invention According to the above invention, an abbreviation corresponding to the content of the control section of the data frame is displayed on approximately one half of the display surface, and an abbreviation corresponding to the content of the control section of the data frame is displayed on the other half (remaining portion) of the display surface. Characters corresponding to all data of the selected frame are displayed. Therefore, it becomes possible to determine the data transmission content and status based on both the abbreviation and the character, and it becomes easy to observe the data transmission content and status.

Embodiment Next, a data observation device for a data communication network according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. In FIG. 1 showing the data observation device, 1a is a transmitting side data input line, and 1b is a receiving side data input line. 2 is a serial-to-parallel converter on the transmitting side, 3 is a serial-to-parallel converter on the receiving side, and line 1
This is a circuit that converts each serial signal obtained from a and 1b into a parallel signal. 4 is a buffer memory, and serial/parallel converter 2,
This is a data memory (capture memory) that stores a certain amount (for example, 32 kbytes) of transmitting side data and receiving side data obtained from No. 3, and outputs it in parallel format.

The abbreviation display and character display data generation circuit 5 shown surrounded by dotted lines includes an analysis abbreviation display data formation circuit 6 and a character display data formation circuit 7.
, a display memory 8, and a main control circuit 9,
Abbreviation display data and character display data are generated based on CRT display control. To explain each part in more detail, the analysis abbreviation display data forming circuit 6 analyzes the content of the control part of the data frame determined by JIS C6363-1978 etc., determines an abbreviation corresponding to this content, and Data for displaying an abbreviation is written into the display memory 8. The character display data forming circuit 7 forms data for displaying the entire contents of the data frame and the data line status in characters based on the data read out from the buffer memory 4, and writes it into the display memory 8. be. The display memory 8 has an address corresponding to the screen of the CRT 13, and stores character display data and analysis abbreviation display data.
In this embodiment, as shown in FIG. 2, first, second, third, and fourth memories 8a, 8b, 8c,
It consists of 8D and has a storage capacity for 4 screens (frames). The analysis abbreviation display data forming circuit 6, the character display data forming circuit 7, and the main control circuit 9 are each composed of a microprocessor, that is, a microcomputer.

The character generator 10 is a known circuit that outputs a signal in serial format for displaying characters (characters, symbols) corresponding to the analysis abbreviation display data and character display data read from the display memory 8. be. Note that the read address designation of the display memory 8 is performed by the display control circuit 11.

The display device 12 is a known CRT display device that includes a CRT 13 and displays characters in the form of dots on a screen in response to a character display signal supplied from the character generator 10.

Next, the operation of the apparatus shown in FIG. 1 will be explained with reference to FIGS. 2 to 6.

In a data communications network, Figure 3 A or B
Data is transmitted using a standard frame determined by JIS C6363-1983, etc. shown in . A frame having an information section for transmitting information shown in FIG. 3A includes a flag sequence section 21 indicating the start of the frame, an 8-bit address section 22, an 8-bit control section 23, and arbitrary bit information Part 24 and 16
It consists of a bit frame check sequence section 25 and a flag sequence section 26 indicating the end of the frame. FIG. 3B shows a frame without an information section, and corresponds to the frame of FIG. 3A with the information section 24 removed.

The transmitting side data and receiving side data shown in the frames of FIGS. 3A and 3B are written into the buffer memory 4. The data written in the buffer memory 4 is read based on the address specification by the main control circuit 9, and first, the content of the control section 23 of the frame shown in FIG. 3 is analyzed by the analysis abbreviation display data forming circuit 6. , data for displaying an abbreviation corresponding to this analysis result is written into the display memory 8. In this embodiment, analysis abbreviation display data for three screens of the CRT 13 is written in advance into second, third, and fourth memories 8b, 8c, and 8d shown in FIG.
Figure 4 shows one screen of CRT13.
An analysis abbreviation display 31 on the transmitting side is shown on the left, and an analysis abbreviation 32 on the receiving side is shown on the right. Note that 33 and 34 are address displays. Figure 4~
SABM in analysis abbreviation 31 in FIG. 6 is an abbreviation that means command to operate in asynchronous balanced mode, that is, Set Asynchronous ous Balanced
It is an abbreviation for Mode, and is determined by JIS C6364-1978. This SABM command is composed of bits of the control section 23 of the frame shown in FIG. 3B. Therefore, if the analysis abbreviation display data forming circuit 6 reads the bits of the control section 23 of the frame and analyzes them, it becomes clear that the command is an SABM command. In the apparatus shown in FIG. 1, the content of the control section 23 is analyzed to find out that it is an SABM command, for example, and data for displaying the SABM on the CRT 13 is formed and written into the display memory 8. Writing to display memory 8 is as follows:
Abbreviations (commands) of the sending side shown in Figures 4 to 6
The second, third, and fourth memories 8b, 8c, 8 shown in FIG.
d continuously.

Memory 8 for analysis abbreviation display data corresponding to the contents of the control unit 23 for transmitting side data and receiving side data
After writing to b, 8c, and 8d is completed,
Read out the part you want to display on the CRT 13 from the memories 8b, 8c, and 8d, arbitrarily extract one screen worth of data based on the address specification, and transfer this one screen worth of data to the first screen.
The data is transferred to the memory 8a. Memory 8b, 8c, 8
Data can be extracted from d by a scroll operation, that is, by moving the extracted portion up and down, and while observing this extracted portion on the CRT 23.
Once one screen worth of analysis abbreviation display data has been transferred to the memory 8a, the analysis abbreviation display data that has been written to approximately correspond to the lower half of the screen of the CRT 13 is erased from the memory 8a, and this part Write character display data to. On this occasion,
The right end of the top row of analysis abbreviations displayed on the upper half of the CRT13 screen (one side) and the left end of the top row of characters displayed on the bottom half of the screen (the other side) are in the same frame. let That is, the first
The main control circuit 9 shown in the figure detects the address of the buffer memory 4 where the frame containing the contents of SABM in the top row of the analysis abbreviation display 31 shown in FIG. and the receiving side data are sequentially read out from the buffer memory 4, forming data for displaying the entire contents of each data frame and characters corresponding to the state of the data line, and writing the data into the lower half of the memory 8a.

In FIGS. 5 and 6, 35 is a character display on the transmitting side corresponding to the entire contents of the frame and the state of the data line, and 36 is a character display on the receiving side. To explain in more detail, the diamond symbol in the character display in the lower half of FIG. indicates the contents of the same frame as the analysis abbreviation display 31 indicated by SABM in the top row of the upper half of FIG. That is, 013Fk 01 in is the 3rd
The contents of the address part 22 of the frame in Figure B are shown,
3F shows the contents of the control unit 23 in hexadecimal, and SABM
means k is the frame inspection sequence section 25
That is, the bits of the CRC check are hexadecimal 4B5F.
. The second 013Fk on the top line of the transmitter character display 35 in Figure 5 indicates the content of the frame corresponding to the SABM in the second row on the left side of FIG. The third character display in the lower half of Figure 5
First 013Fk in row indicates the contents of the same frame as the SABM in the third row on the left side of the upper half of Figure 5,
0153SHv in the 3rd row of the bottom half is the 4th row on the left side of the top half
0173EXw on the second line in the bottom half of Figure 5, which shows the content of the DISC frame in the row, is the first line on the right side of the top half.
Shows the contents of the same frame as the analysis abbreviation display 32 shown in line 73, and 011Fi in the second line of the lower half indicates the contents of the same frame as the analysis abbreviation display in the second row on the right side of the upper half. The symbol in the lower half of Figure 5 is FF
is not a flag and indicates that the data line status is high.

In this device, data for displaying analysis abbreviations for three screens is written in advance in the memories 8b, 8c, and 8d, so that the screen can be scrolled, that is, moved up and down over the three screens. If a new display location of the analysis abbreviation display is extracted under the control of the main control circuit 9 in FIG. are sequentially read out, character display data corresponding to the contents of the frame and the state of the data line are formed by the microprocessor and written into the lower half of the memory 8a. Figure 6 shows the display in Figure 5 scrolled by one line.
The row corresponds to the second row on the left side of the upper half of Figure 5, and the sixth row
The character display in the lower half of the figure is a sending/receiving character display in which 0173EXw in the second line of the lower half character display in FIG. 5 corresponds to the beginning of the second line in FIG.

As is clear from the above, this embodiment has the following advantages.

(A) A character display indicating the entire contents of the frame and the status of the data line is displayed on the lower half of the screen of the CRT 13, and an analysis abbreviation of the content of the control unit 23 of the frame in the character display is displayed on the upper half of the screen. Therefore, the content and status of data transmission can be easily checked.

(B) Since the display memory 8 has a storage capacity of one screen or more and is configured to be scrollable, it is easy to check the data transmission contents and status.

(C) The head of the character display on the lower half of the screen is displayed so as to correspond to the head of the analysis abbreviation display on the upper half of the screen, so the mutual relationship can be easily determined.

(D) Data on the sending side and data on the receiving side are displayed separately, making it easy to check the data.

(E) Data for displaying analysis abbreviations is written in advance in the display memories 8b, 8c, and 8d for multiple screens (3 screens), and this is configured so that it can be scrolled and displayed. You can easily search for the desired location.

(F) Since a part of the data generation circuit 5 for abbreviation display and character display is constituted by a microprocessor, the configuration can be simplified.

Modifications The present invention is not limited to the embodiments described above, and, for example, the following modifications are possible.

(a) As shown in FIG. 7, a transmitting side analysis circuit 41,
The receiving side analysis circuit 42, the conversion circuit 43, and the display memory 8 may constitute the abbreviation display and character display data generation circuit 5. In this case, the data of the control unit 23 is transferred to the analysis circuit 41,
The conversion circuit 43 generates abbreviation display data corresponding to the analysis result and writes it into the memory 8. Further, the data read from the buffer memory 4 is converted into character display data by the conversion circuit 43 and written into the memory 8.
In this case as well, the analysis circuits 41 and 42 and the conversion circuit 43 are constructed from microprocessors.

(b) In FIGS. 1 and 7, the abbreviation display and character display data generation circuit 5 is composed of functionally divided circuits, but it is composed of a single microprocessor and is time-divisionally divided. It may be configured to obtain character display data and abbreviation display data. That is, the character display data forming circuit 7 and the analysis abbreviation display data forming circuit 6 shown in FIG. 1 may be configured with a common microprocessor, and the necessary display data may be sequentially formed according to a program. . Similarly, the analysis circuits 41 and 42 and the conversion circuit 43 shown in FIG. 7 may be constructed using a common microprocessor.

(C) The display memory 8 may be used not only to store display data, but also to form character display data and analysis abbreviation display data.

(D) The character display may be a binary display consisting of "0" and "1".

(E) Character display data may be written in the display memory 8 first, and analysis abbreviation display data may be written later.

(F) The display device 12 may not be a CRT display device, but may be another display device such as a liquid crystal display device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a data observation device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a first display memory, and FIGS. 3 A and B are frame configuration diagrams showing a data frame configuration. , Figure 4 is the first
5 is a front view showing the display based on the present invention on the CRT shown in FIG. 1, FIG. 6 is a front view showing the display in FIG. 5 scrolled, and FIG. The figure is a block diagram showing a data generating circuit 5 for character display and analysis abbreviation display according to a modified example. 4... Buffer memory, 5... Abbreviation display and character display data generation circuit, 6... Analysis abbreviation display data formation circuit, 7... Character display data formation circuit, 8... Display memory, 9... Main control circuit, 10
...Character generator, 11...Display control circuit, 12
...Display device, 31, 32...Analysis abbreviation display, 35,
36...Character display.

Claims (1)

[Scope of Claims] 1. Contents of a buffer memory that stores a certain amount of data in a data transmission path for data communication, and a data frame control unit that transfers the data based on the data read from the buffer memory. and forming abbreviation display data corresponding to the content of the control unit, and writing this abbreviation display data into a display memory so as to correspond to approximately one half of the display surface of the display device described later, forming character display data corresponding to the entire contents of the data frame corresponding to the abbreviation display data, and writing this character display data into the display memory so as to correspond to the other approximately half of the display surface; an abbreviation display and character display data generation circuit that generates the abbreviation display data and the character display data from the display memory based on display control; a character generator that generates character signals corresponding to abbreviation display data and the character display data; and a character generator that generates at least the abbreviation display data on approximately one half of the display surface in response to the output of the character generator. A data observation device comprising a display device that displays a corresponding abbreviation and displays a character corresponding to the character display data on the other approximately half of the display surface.