JPS63225127A - Real time waveform observation instrument - Google Patents

Abstract

PURPOSE:To perform a high speed screen scroll and enable a transition point indicative of the latest input data of a waveform to be observed by changing start address and input data destination address to the subsequent addresses to be set. CONSTITUTION:Input data taken in from an A/D converter 12 at every display partitioned sectional region of one screen along time series are sequentially written in input data writing means 15. Then, readout address setting means 17 sets the start address of one screen read out from a display memory 16 for a display controller 18. An input data destination address B included in one screen is set for the memory 16 and, after the display of the whole input data in a prescribed memory partitioned region determined by the address B is terminated, the start address previously set and the address B are changed to the subsequent addresses to be set. By repeating resetting in the same manner, the input data are read out from the memory 16 by the controller 18 and the input data can be sequentially displayed 22 at every display partitioned sectional region on one screen.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a real-time waveform observation device that displays waveforms representing voltage, current, and other input data on a screen in high-speed scrolling.

Prior to the prior art, the applicant filed a patent application on March 10, 1986 for a real-time waveform recorder with monitor. In this waveform recorder, the voltage, current, and other input data obtained by an A-D converter are displayed as waveforms on a display device such as a CRT, and the waveforms on the recording paper in the recording device flow as the monitored waveforms. It is displayed continuously by scrolling (continuous parallel movement of the screen). In other words, in this screen scrolling, input data is sequentially displayed in chronological order on one vertical line for displaying one dot near one side of the screen, and then shifted one vertical line at a time toward the opposite side. This process is repeated for all input data displayed on the screen. When the screen is scrolled line by line like this, the movement of the waveform monitored on the screen appears smooth.

Problems to be Solved by the Invention However, if such a shift is performed for each line of input data displayed on the screen, a considerable amount of time will be spent on the shift.

As a result, other processing becomes slow, resulting in A-
The speed of input data from the D converter must be slowed down, making it impossible to capture high-speed phenomena.

The present invention has been made by focusing on such conventional problems, and provides a real-time waveform observation device that performs high-speed screen scrolling and is suitable for observing transition points indicating the latest input data of the waveform. The purpose is to

Means for Solving the Problems Means for achieving the above object will be explained below using FIG. 1 which clearly shows the present invention.

This real-time waveform observation device includes an A-D converter 12 for converting input data provided in input channel 1Q from analog data to digital data, a display memory 16 for writing the input data, and an input data in the display memory 16. It is equipped with a display controller 18 that performs reading and display control, and a display device 22 that scrolls and displays input data under the control of the display controller 18. - The input data is taken in from the D converter 12 in time series for each display segmented area of one screen, and is sequentially written into a predetermined storage segmented area determined by each input data transfer destination address of the display memory 16. A writing means 15 is provided, and a display memory 16 for the display controller 18 is provided between the input data writing means 15 and the display controller 18.
The start address of one screen to be read from is set, the input data transfer destination address included in the one screen is set for the display memory 16, and a predetermined storage partition area determined by the input data transfer destination address is set. When all the input data has been displayed, change the start address and input data transfer destination address that were set earlier to the next address in order, and then set the read address again. A setting means 17 is provided.

action The above means works as follows.

The input data writing means 15 imports the input data from the A-D converter 12 in chronological order for each display segment area of one screen into a predetermined storage segment area determined by each input data transfer destination address of the display memory 16. Write input data sequentially,
The read address setting means 17 is the display controller 18
For the display memory 16, set the start address of one screen to be read from the display memory 16, set the input data transfer destination address included in that one screen for the display memory 16, and set the input data transfer destination address according to the input data transfer destination address for the display memory 16. When all the input data has been displayed in the determined predetermined storage partition area, change and set the start address and input data transfer destination address set earlier to the next address in the order, and then repeat the settings again in the same manner. By repeating the settings, the display controller 18 reads each input data from the display memory 16, and the input data can be sequentially displayed in each display section on one screen.

Therefore, even if the screen is scrolled at a high speed according to the capability of the display controller 18, the input data is displayed one after another in each display segment area.

Example Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 2 is a block diagram showing a real-time waveform observation device according to an embodiment of the present invention. In the figure, 10 is a channel for sending analog input signals @Si such as voltage, current, and power, and 12 is an A-D converter that is interposed in the channel 10 and converts input data from analog data to digital data.

For example, an 8-bit converter is used for this A-D converter 12. In addition, if it is 8 bits, the input data taken in from the A-D converter 12 is 00-FFH (shown in hexadecimal).
can be one of the values. 14 is a device equipped with a CPU that performs processing necessary to display input data as a real-time waveform. This device 14 includes a display memory for writing input data, such as a VRAM (Video RAM) 16;
A display controller, for example, a CRTC 18, which reads input data from the display memory 16 and performs display control;
A recording device such as a dot printer 20 for recording input data in print is connected to each of them. Reference numeral 22 denotes a display device that scrolls and displays input data under the control of the display controller 18, such as a rask scan type CRT.
(Cathode ray tube). This display device 22 is an LCD
(Liquid crystal display) is also fine.

Note that for observing the real-time waveform of such input data, it is sufficient to have a display device 22 that can easily use a screen, and the recording device 20 is not necessarily required. The device 14 equipped with the above-mentioned CPU includes, for example, a CPU (central processing unit) 24, R
OM (read-only memory) 26, RAM (i-output writable memory) 28, input/output port 30, pass line 3
A microcomputer consisting of 2 etc. is used. The CPU 24 corresponds to the central brain part of a microcomputer, and according to program instructions, executes overall control and performs arithmetic and logical operations.
The results are also temporarily stored. It also controls surrounding devices. The ROM 26 stores a control program for improving the overall performance of the recorder, a real-time waveform display processing program for input data, and the like. or,
The RAM 28 stores data such as calculation results of the CPU 24, but also serves as a buffer 7 memory that temporarily stores input data such as voltage and current. Input/output port 30 has A
A -D converter 12, an operation switch (not shown), a recording device 20, etc. are connected. The path line 30 is an address bus line, a data bus line, and a data bus line for connecting them.
It includes a control path line and the like, and is also coupled to the display memory 16 and the display controller 18. Furthermore, if a dot matrix printer equipped with a line-type thermal recording head is used as the dot printer serving as the recording device 20 described above, the input data taken in from the A-D converter 12 can be converted to match the thermal head. , a waveform can be printed with dots as shown in FIG. However, 3
4 is a thermal head, 36 is a recording paper, 38 is a waveform, and an arrow is a moving direction of the recording paper 36. The thermal head 34 has dot positions along one line from number 1 to number X indicating the amount of input data.

Next, the operation of this embodiment will be explained.

4 and 5 are flowcharts consisting of steps P1 to P1° showing an example of a real-time waveform display processing program for input data. Figure 6 shows the display memory (
This is an explanatory diagram showing the correspondence between each address (indicated by a dotted line frame) consisting of 8 bits) and the screen of a display device (indicated by a solid line frame). To run this program, first
So, 5T-ADR is a, DT-ADRen, BIT is 7
, C0UNT@0, respectively. These 5
T-ADR, DT-ADR, BIT, and C0UNT are all variable names (names indicating data storage locations), and 5
In T-ADR, the display controller 18 is the display memory 1.
Start address of one screen read from 6, DT-AD
R is the input data transfer destination address included in that one screen,
BIT represents the bit of the DT-ADR, and C0UNT represents the bit count. After initial settings,
D T -* A D R vertical display memory 16
Clear the contents of. In addition, 5T-ADR and DT-AD
R corresponds to the vicinity of both the left and right upper ends of one screen. Next, at P2, the input data is taken in from the A-D converter 12 in time series for each display segment area of one screen, for example, every line, and is written into the buffer memory (RAM) 28, and then
The data in the buffer memory 28 is transferred to the recording device 20 and printed.

Next, in P3, the input data is read from the buffer 7 memory 28, and the bit corresponding to the predetermined storage section area of DT-ADR of the display memory 16 (if BIT is 7, the most significant bit included in that address The data is transferred in the vertical direction of one bit line (one bit line) and written to the position corresponding to the input data. The display controller 18 reads input data from the display memory 16 at regular intervals, performs display control, and displays the data on the screen of the display device 22 (7th
Figure A). At that time, all input data is read by the display controller 18 and displayed on one screen. Then P
4, add 1 to COUNT and go to P5. At P5, it is determined whether C0UNT is <16 or ≧16. The reason why C0UNT is determined to be 16 is because the display controller 18 in use happens to have a controller that shifts by 16 dot lines when the start address is changed. Therefore, if you use a controller that shifts by 8 bit lines when changing the start address, C0UNT will be determined as 8. If the number is 16, go to P. At P6,
Subtract 1 from BIT and go to P7. In P7, BIT
Determine whether ≧O or ≧O. If ≧O,
Each step of P2 to P7 is repeated up to one bit line represented by the least significant bit of DT/ADR, and all data transfer and display thereof are performed (FIG. 7B).

If it is determined to be O at P7, go to P8. At P8, D
After setting the T-ADR to an adjacent address in the following order, the contents of the vertical display memory 16 of that DT-ADR are cleared. Next, in P9, set BIT to 7, and repeat each step of P2 to P7 again (7th C).
figure). In this way, one screen of 5T-AD set
Regarding R and DT-ADR included in that one screen, when the display of all input data on that one screen is completed, P5
Then, it is determined that ≧16. Next, in Plo, DT/ADR
is further set to an adjacent address in the next order, and then the contents of the vertical display memory 16 of that DT-ADR are cleared. Next, use Pll to add 1 to ST・ADR,
Set it to the next address in the next order.

That is, the screen is scrolled to the left by two addresses (16 bits) (Figure 7D). Next, set BIT to 7 on PI3, and set C(
]JNT is set to O, and the input data is displayed on the next screen (Figure 7E). FIG. 7 shows an outline of the input data input up to this point, which is displayed on the recording paper and on the screen in dot-by-dot correspondence for each process. Furthermore, in the figure, numerals 40 and 42 indicate corresponding dots on the recording paper and the screen, and the arrows indicate the subsequent transitions of the dots in each process.

By repeatedly performing the above-described processing on input data, the screen on the display device 22 can be scrolled at high speed. In order to perform such high-speed scrolling, the display controller 18 is equipped with a high-speed scrolling function. Note that if the display controller does not have such a high-speed scrolling function, it may be supplemented by software. As a result, the movement of the waveform displayed on the screen becomes smooth, making it suitable for capturing high-speed phenomena and observing transition points indicating the latest input data of the waveform.

However, if only high-speed scrolling is used, the scrolling will be in 8-dot units or 16-dot units, that is, in address units.
As shown in FIG. 8 (corresponding diagram to FIG. 7), there is a delay in displaying the screen, which is inconvenient for observing the latest waveform input data.

According to the present invention described in detail, the movement of the waveform representing input data displayed on the screen becomes smooth, and it is possible to capture high-speed phenomena and immediately observe the transition point of the waveform representing the latest input data. can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a real-time waveform observation device according to the present invention. FIG. 2 is a block diagram showing a real-time waveform observation device according to an embodiment of the present invention. FIG. 3 is an explanatory diagram showing the recording state of input waveforms by the recording device employed in the same embodiment. 4 and 5 are flowcharts of a waveform display processing program for input data adopted in the same embodiment. FIG. 6 is an explanatory diagram showing the correspondence between the display memory employed in the same embodiment and the screen of the display device. FIG. 7 is an explanatory diagram in which input data in the same embodiment is displayed in correspondence with dots. FIG. 8 is a reference diagram corresponding to FIG. 7 with only high-speed scrolling. 10...Input channel 12...A-D converter 1
4... Device equipped with CPU 15... Input data writing means 16... Display memory 17... Read address setting means 18... Display controller 22
...display device

Claims (1)

[Claims] An A-D converter for converting the input data from analog data to digital data provided in the input channel, a display memory for writing the input data, and a display of the input data from the A-D converter in chronological order on one screen. Input data writing means that captures each segmented area and writes sequentially to a predetermined storage segmented area determined by each input data transfer destination address of the display memory, and a display that reads input data from the display memory and performs display control. For the display controller and display controller, set the start address of one screen to be read from the display memory, and for the display memory, set the input data transfer destination address included in that one screen, and set the input data transfer destination address for the display memory. When all input data has been displayed in the predetermined storage area determined by the data transfer destination address, change and set the start address and input data transfer destination address set earlier to the addresses in the following order. A real-time waveform observation device comprising: read address setting means for repeatedly performing resetting thereafter; and a display device for scrolling and displaying input data under control of a display controller.