JPH057646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to recorders for displaying voltage, current, and other input data, particularly those having insensitive processing output characteristics.

Prior Art Conventionally, to record voltage, current, and other input data, a recorder equipped with a dot matrix printer is used to write on recording paper. At that time, the A-D provided for the input channel
The analog input data is digitized by a converter, and dots corresponding to the digital data are formed on recording paper to draw waveforms.
By displaying sampling data as dots that faithfully correspond to them in this way, there will be no misunderstandings, and the density of the dots can be felt.
Furthermore, if the change in waveform is not sudden, it appears smooth.

Problems to be Solved by the Invention However, when a voltage near the turning point of the output count is input to the A-D converter,
-D conversion data is not constant, and its output count increases and decreases within the range of 1 count and fluctuates. For example, when the input voltage is indicated by the arrow in FIG. 11, the A-D conversion data fluctuates between 2 and 3, and each time it is read, it becomes unclear which one it is. Furthermore, due to the influence of noise mixed in the input signal and the instability of the A-D converter, fluctuations are likely to occur even if the input voltage is slightly away from the turning point of the output count. If this fluttering occurs at the transition point in dot printing, even if the input signal is constant, the recording will look like noise or the line thickness will double, making it difficult to see, as shown in Figure 12. becomes.

The present invention has been made by focusing on such conventional problems, and by selecting the output of display data created from A-D conversion data,
The output has insensitive characteristics such as hysteresis,
The purpose of the present invention is to provide a recorder whose display does not have any noticeable flapping.

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

A recorder having this insensitive processing output characteristic includes an A-D converter 12 provided in an input channel 10 for converting input data from analog data to digital data, and a waveform for displaying display data created from the digital input data. A digital input data change determination means 30 is provided between the display unit 16 and the digital input data change determination means 30 that sequentially determines data changes from two adjacent digital input data along the time series, and when the determination result is a predetermined value, the latter digital input data is connected to the display 16. It includes a digital input data insensitive processing means 32 that performs necessary insensitive processing on data to correct the digital input data, and a display data creation means 34 that creates display data corresponding to each of the digital input data. do. Alternatively, between the similar A-D converter 12 and the waveform display 16, there is a display data creation means 36 that creates display data corresponding to the digital input data, and a display data creation means 36 that creates display data corresponding to the digital input data, and a display data creation means 36 that creates display data corresponding to the digital input data, and from two adjacent display data along the time series. Display data change determination means 38 that sequentially determines changes in data, and display data insensitivity processing means 40 that performs necessary insensitivity processing on the latter display data to correct the display data when the determination result is a predetermined value. The system is equipped with the following.

Effect The above means works as follows.

The A/D converter 12 is interposed in the input channel 10 to sequentially convert input data from analog data to digital data. These digital input data are subsequently processed as sampling data. Digital input data change determination means 3
0 sequentially determines changes in data from two adjacent digital input data along the time series. If the determination result is a predetermined value, the digital input data insensitive processing means 32 corrects the latter digital input data by performing necessary insensitive processing. The display data creation means 34 creates display data corresponding to each of the digital input data. The waveform display 16 displays these display data. As a result, the displayed waveform has an insensitive processing output characteristic. or,
Between the A-D converter 12 and the waveform display 16,
When the display data creation means 36, the display data change determination means 38, the display data insensitive processing means 40, etc. are provided, after creating corresponding display data from each sampled digital input data, the adjacent display data along the time series are created. It is possible to sequentially determine changes in data from the two pieces of display data, and if the determination result is a predetermined result, the latter display data can be corrected by performing necessary insensitive processing. Again, the displayed waveform will have insensitive processing output characteristics.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

FIG. 2 is a block diagram illustrating a recorder with insensitive processing output characteristics according to an embodiment of the present invention. In the figure, 10 is a channel for sending analog input signals S _i 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, a 10-bit converter is used for this A-D converter 12. 14 is a calculation device that performs processing necessary for displaying the insensitive processed waveform; 16 is the same device 14;
This is a waveform display device that receives the output signal S ₀ from the inverter and displays a non-sensitive processed waveform. This arithmetic unit 14 is, for example, a microcomputer, including a CPU (central processing unit) 18, a ROM (read-only memory) 20,
RAM22, input port 24, output port 26,
It is composed of bus lines 28 and the like. the
The CPU 18 corresponds to the brain of a microcomputer, and executes overall control according to program instructions, performs arithmetic and logical operations, and temporarily stores the results. or,
It also controls surrounding devices. ROM
20 stores a control program for improving the performance of the entire recorder, a non-sensitive processing waveform display processing program, and the like. Further, the RAM 22 stores input data such as voltage and current, data of calculation results of the CPU 18, and the like. Input port 24 has A-
A D converter 12, an operation switch (not shown), etc. are connected. The output port 26 is also connected to the waveform display 16. The bus line 28 includes an address bus line, a data bus line, a control bus line, etc. for connecting these, and is also coupled to peripheral devices. The waveform display 16 is, for example, a dot matrix printer and has a line type thermal recording head. The effective recording area of the recording paper consists of 251 dots for each line, and the recording positions are distributed from the bottom (0%) to the top (100%) as shown in FIG. This recording paper is fed by a stepping motor or the like. Below, for convenience of explanation, among the dots to be recorded, the bottom of the recording section (0
The dot corresponding to %) is numbered 0, and the dot corresponding to the top (100%) is numbered 250, and the recording position is designated by that number. This recorder is constructed so that four counts of A-D conversion data correspond to the amplitude of one dot on recording paper. Its recording position is A
-D It moves from 0% to 100% in proportion to the conversion data.

FIGS. 4 and 5 are flowcharts consisting of steps P ₁ to P ₁₂ showing a first example of the insensitive processing waveform display processing program. To run this program, first set SLOP to 1 and AD0 to 0 on P ₁ .
Perform the initial settings as follows. This SLOP is A-D
A variable name representing the slope of the conversion data, AD0, is a variable name representing the previous A-D conversion data. Note that the variable name is a name indicating the storage location of data. Next, at _P2 , input the conversion data (digital data) from the A-D converter 12 and convert it into
Put it in AD. This AD is this time (latter) A-D
This is a variable name representing converted data. Then in P ₃ ,
AD-AD0, that is, the difference between the previous and current data, is calculated, and it is determined whether it is 0, ≦-1, or ≧1. 0
When , go directly to P ₄ without changing SLOP. ≦-1
At _P5 , set SLOP to 0 and go to _P4 . or,
When ≧1, go to P ₆ , set SLOP to 1 and go to P ₄ .
P ₄ determines whether SLOP is 1 or 0. In addition, SLOP
When is 1, this indicates that the current A-D conversion data is changing as the rising edge increases, but when it is 0, it indicates that the falling edge is changing. P ₇ if SLOP is 1
Then, the dot data is calculated according to the formula DOT=AD÷4. If SLOP is 0, go to _P8 . In P ₈ , dot data is DOT = (AD + 1) ÷ 4
Calculated according to the formula. In addition, in both formulas
DOT is a variable name representing dot data. or,
In both formulas, even if there is a remainder, it is discarded. Adding 1 to AD in the latter formula is that
Even if AD decreases by one count of the A-D conversion data, this will not appear in the dot data within that range, and this is a process for recording the previous dot data as it is. That is, the digital input data (AD) is corrected by performing the necessary insensitive processing (adding one count). Note that such one count corresponds to the insensitive input data width of dot data. When the A-D conversion data falls in this way, if the digital input data is subjected to insensitivity processing, the display 1
6, a hysteresis output characteristic as shown in FIG. 6 appears by printing dots. By doing this, when the waveform rises and falls, A-D
Since the calculation results from conversion data to dot data (recording position) are different, for A-D conversion data,
At the falling edge of the waveform, the dot data has an insensitive input data width of 1 count, and small fluctuations in the converted data no longer appear on the recording paper. In reality, there are no lines in the diagram, only dots, but in order to make it easier to see the hysteresis changes, these dots are connected by lines, and rising and falling points are shown by arrows. Then on P ₉ , for next time, AD
Put it in AD0. Next, use P ₁₀ to determine whether DOT is greater than 250. If NO, in _P11 , the printer 16 records the previously created dot data as a dot at the corresponding recording position on the recording paper. If YES, set DOT to 250 with P ₁₂ .
This is the process when overscaling occurs, and all dot data will be dotted at number 250. In this way, dots are printed at the corresponding recording positions of each line numbered 0 to 250 on the recording paper, and the printing is repeated while changing the line to draw a hysteresis waveform. In addition, as such a waveform display 16,
You can also use a CRT (cathode ray tube), printer, etc.

FIGS. 7 and 8 are flowcharts consisting of steps P ₂₁ to _{P 33} showing a second example of a non-sensitive processing waveform display processing program in which the non-sensitive input data width is n. To run this program, first
At _P21 , initial settings are made by setting AD0 to 0 and H to 0. This H is a variable name representing the insensitive processing input data width. Next, at P ₂₂ , the A-D converter 12
Input the conversion data from , and put it into AD.
Next, in P ₂₃ , Z is calculated using the formula Z=|AD−AD0|. This |AD−AD0| is the absolute value of the difference between the previous and current (latter) data. Furthermore, Z is |
This is a variable name representing AD−AD0|. Then on P ₂₄ ,
Determine whether Z is 0. If YES, go to P ₂₅ . _P25
Now, dot data is calculated using the formula DOT=(AD-H)÷4. If NO, go to P ₂₆ . Z in P ₂₆
is calculated from the formula Z=Z-1. Next go to P ₂₇ ,
Therefore, H=H+(AD-AD0)/|AD-
Calculated from the formula AD0｜. In addition, (AD−
AD0)/|AD-AD0| becomes +1 when the A-D conversion data rises, and becomes -1 when it falls. As a result, H can be set to + or - depending on whether the signal rises or falls. Then P ₂₈
Then, it is determined whether H is 0≦H≦n. Note that n is an arbitrary constant indicating the non-sensitive processing input data width (the count number of AD conversion data). For this reason, A.D.
When _P28 changes at a high level within the insensitive input data width with respect to AD0, P28 is always
It becomes YES and returns to P ₂₄ , and the judgment of P ₂₄ is finally
YES. Then, in _P25 , the current insensitive input data width H is subtracted from AD to create dot data. Since this dot data has been corrected by applying an insensitive input, no change appears and it is the same as the previous dot data. AD is AD0
On the other hand, when changing beyond the insensitive input data width n, _P28 always becomes NO at the end, whether it is rising or falling. Next, at P ₂₉ , move the H back by one. This is because in order to make a NO judgment in P ₂₈ , H is changed to n.
This is because the calculation is performed one more time. Then at P ₂₅ ,
Create dot data by subtracting H from AD.
This dot data will show a change after being corrected by insensitive processing. Next _P30
The process performed in steps ~ _P33 is the same as _P9 ~ _P11 in the first example.
This is the same as the processing of the corresponding step. In this way, at both the rise and fall of the waveform, A
In contrast to the -D converted data, the dot data has an insensitive input data width n, and small fluctuations in the converted data no longer appear on the recording paper.

FIGS. 9 and 10 are flowcharts consisting of steps P ₄₁ to _{P 52} showing a third example of the insensitive processing waveform display processing program. To run this program, first set SLOP to 1 and DOT0 in P ₄₁ .
Set the value to 0 to perform initial settings. This DOT0 is 1
This is the variable name representing the previous dot data. next
At _P42 , the converted data is input from the A-D converter 12 and is input into AD. Next, in P ₄₃ , dot data is calculated using the formula DOT=AD+4. In addition,
Cut off the remainder. Next, in _P44 , DOT-DOT0 is calculated, and it is determined whether it is 0, ≦-1, or ≧1. When it is 0, go directly to P ₄₅ without changing SLOP.
When ≦-1, go to P ₄₆ , set SLOP to 0 and go to P ₄₅ . Also, when ≧1, use P ₄₇ and set SLOP to 1.
Go to P ₄₅ . At P ₄₅ , it is determined whether SLOP is 0. Note that when SLOP is 1, this indicates that the current (latter) dot data is changing as the rising edge increases, and when SLOP is 0, it indicates that the dot data is changing as the rising edge changes. If SLOP is 1, go to P ₄₈ and DOT is 250
Determine whether it is greater than If NO, go to P ₄₉ ;
Put DOT in DOT0 for next time.
If YES, P ₅₀ and DOT 250. This is what happens when you overscale. Then _P45
And if YES, go to P ₅₁ . Therefore, dot data is calculated using the formula DOT=DOT+1. The reason why 1 is added to DOT in this formula is to ensure that even if the DOT decreases by one dot, this will not appear in the dot data within that range, and the previous dot data will be recorded as is. That is, the dot data (AD/4) obtained in step _P43 is subjected to the necessary insensitivity processing (adding 1 dot),
This means that the dot data has been corrected. In addition,
One such dot corresponds to the insensitive input data width of dot data. Next, in _P52 , the printer 16 records the previously created dot data as dots at the corresponding recording position on the recording paper. The processing in this example is almost the same as in the first example.
However, whereas in the first example the A-D conversion data is used as it is to determine the change in data, the present example is characterized in that it is determined after converting it to dot data.

Effects of the Invention According to the present invention described above, it becomes possible to perform insensitive processing on display data created from AD conversion data. Therefore, it is possible to provide the output with insensitive characteristics such as hysteresis, and to eliminate undesirable fluttering on the display.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating a recorder having insensitive processing output characteristics according to the present invention, in which figure A shows the first invention and figure B shows the second invention. FIG. 2 is a block diagram showing the recorder according to the first embodiment of the present invention. FIG. 3 is an explanatory diagram showing the recording process on the recording paper of the printer used in the same embodiment. 4 and 5 are flowcharts showing a first example of the insensitive processing waveform display processing program used in the same example, and FIGS. 7 and 8 are flowcharts showing a second example of the same processing program, FIGS. 9 and 10 are flowcharts showing a third example of the same processing program. FIG. 6 shows A-D obtained by the processing program of the first example.
FIG. 4 is a diagram illustrating hysteresis output characteristics showing the correspondence between converted data and recording (dot) positions.
FIG. 11 is an explanatory diagram showing the relationship between the input voltage of the AD converter and AD conversion data. FIG. 12 is a diagram illustrating recording of input data by a conventional recorder. 10...Input channel, 12...A-D converter, 14...Arithmetic unit, 16...Waveform display, 3
0...Digital input data change determination means, 32...
...Digital input data insensitive processing means, 34,3
6...Display data creation means, 38...Display data change determination means, 40...Display data insensitive processing means.

Claims (1)

[Claims] 1. An A-D converter that converts input data provided in an input channel from analog data to digital data, and sequentially determines changes in data from two adjacent digital input data along the time series. digital input data change determination means; digital input data insensitivity processing means for correcting the latter digital input data by performing necessary insensitivity processing on the latter digital input data when the determination result is a predetermined value; What is claimed is: 1. A recorder having insensitive processing output characteristics, comprising display data creation means for creating display data corresponding to digital input data, and a waveform display for displaying the display data. 2. An A-D converter that converts input data provided in an input channel from analog data to digital data, display data creation means that creates display data corresponding to each of these digital input data, and adjacent devices along the chronological order. a display data change determining means for sequentially determining a change in data from two pieces of display data; and a display for correcting the display data by performing necessary insensitive processing on the latter display data when the determination result is a predetermined value. 1. A recorder having insensitive processing output characteristics, comprising data insensitive processing means and a waveform display for displaying the display data.