JPH0240963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic scale having only a weight indicator as an indicator.

Electronic scales convert weight sensor output into counts using an analog/digital converter, calculate weight data from the counts, and display it on a weight display, making it easy and accurate to adjust the zero point and span. It is necessary to display the counts taken in from the analog-to-digital converter as they are. In addition, the scale is equipped with various functions, such as switching between kilograms and pounds, switching the maximum allowable weight, etc., and various functions are selectively activated by setting a switch, and the setting status of this switch is shown on the display. It is desirable to be able to confirm the

By the way, when displaying the count from the converter as it is, it is relatively easy to display the count on a weight display, but it is also possible to display the setting status of the many switches that set whether various functions are activated or not on the weight display. If the number of switches is greater than the number of digits on the display, it will not be possible to display it directly on the display. For example, if the number of digits on the display is 5 and there are 10 switches, the status of the switches cannot be displayed as is.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic scale that can also serve as a weight display and reliably display the setting states of a large number of switches for setting whether or not to operate various functions.

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

In FIG. 1, reference numeral 1 denotes a weight sensor consisting of a load cell or the like, and this weight sensor 1 outputs a pressure signal corresponding to the weight of the object to be weighed. The voltage signal output from the weight sensor 1 is amplified by a differential amplifier 2, and furthermore, high frequency components such as noise are removed by a low-pass filter 3, and the signal is input to an A/D (analog-digital) converter 4. It's summery. The A/D converter 4 is of a double integration type, for example, and outputs a count corresponding to the input voltage as a digital signal.
A digital signal output from the A/D converter 4 is input to an I/O port 5. Said I/O
The port 5 also operates a large number of status switches 61, 62, ... 6n for setting whether or not to operate various functions, such as a switch for changing the weighing unit to pounds/kilograms, a switch for changing the maximum weight, a switch for selecting an interface, etc. Information is now being entered. The weight count data and switch operation information input to the I/O port 5 are processed by the data processing device 7, which includes a CPU (Central Processing Unit) 8 and a RAM (Random Access Memory).
The CPU 8, RAM 9, ROM 10 and the I/O port 5 are electrically connected to each other by a data bus 11 and an address bus 12. Further, the CPU 8, RAM 9, and ROM 10 are connected to the display/keyboard controller 13 and the ECR via the data bus 11 and address bus 12.
It is electrically coupled to the interface 14 for use. The display/keyboard controller 13 controls a keyboard 15 and a five-digit weight display 16, and outputs key inputs from the keyboard 15 to the data processing device 7, and also outputs display data from the data processing device 7 to the above. Display 16
I am trying to output to . The ECR interface 14 is an interface for controlling data transfer with an ECR (electronic cash register) (not shown). The keyboard 15 is provided with various keys such as a numeric keypad 17 and a test key 18.

As shown in FIG. 2, the RAM 9 has a configuration of 256 words (16×16) with 4 bits per word, for example.
Various registers, various flag memories, etc. are formed. Each word is M [X, Y], each bit is <>
To describe the main registers and memory configuration, the weight register is formed by five words M[0,0] to M[0,4], and the weight register is made up of five words M[0,0] to M[2,F].
Form a working register with 16 words of M
[5,0], M[5,1], M[5,2], M[5,
3] and M[5,4] form a register that stores the contents of the various status switches 61, 62...6n, and five words M[7,0] to M[7,4] form a register that stores the contents of the various status switches 61, 62...6n. Forms the ADC register. Also, M[8,0] to M[8,5], M[9,0] to M[9,
5], M[A,0]~M[A,5],M[B,0]~
24 words of M [B, 5] form a conversion register,
M[C,0]~M[C,A], M[D,0]~M[D,
A], M[E,0] to M[E,A], M[F,0]M
The 44 words [F,,A] form a conversion calculation register. Also M[6,0]〈0〉TEST1F
(flag), M [6,0] <1> TEST2F, M
[6,1] <0> is the weight over flag, M [6,1]
<1> is formed as a motion detection flag.

Figures 3, 4 and 5 show I/O port 5.
and the CPU by input from the keyboard 15.
This is a flowchart of the main control carried out by 8. This control flow is
It is set to ROM10. FIG. 3 is a main flowchart, in which initial processing is performed when the power is turned on. This initial processing involves clearing RAM9, various status switches 61, 62,...
Processing such as reading 6n is performed. Subsequent segment scanning is performed. This is done by sequentially lighting up each digit from 0 to 9 to check whether the segments of each digit of the weight display 16 are lit normally. Next, key processing is performed. Here, when a key operation is performed on the keyboard 15, processing corresponding to the key input is performed. Well then
The count data input from the ADC, that is, the A/D converter 4, is read into the ADC register. Now, we digitally process the count data read in to remove flickering. Let's test
If 1F or 2F is set, branch to the test routine. In this case, when the zero point changes within a certain range, the changed point is automatically corrected to a new zero point. For example, if Kg setting has been made, the read data is multiplied by a Kg coefficient and converted into Kg.
Then, subtract the tare weight from the read weight data to calculate the net weight. Then, if there is a change in the displayed weight, the motion detection flag is set to "1". Now round the weight data to the smallest scale unit. Then, display data is determined and displayed while checking the motion detection flag, overweight flag, etc. Then, if the weight is stable when the ENABLE signal, which is a weight transfer command, is input from the ECR, the weight data is transferred to the ECR for processing. When this transfer processing is completed, the key processing routine returns again.

Figure 4 shows the test key 18 in key processing.
This shows a flowchart when the test key 18 is operated, and when the test key 18 is operated, the status of TEST1F and TEST2F is checked. Both TEST1F and 2F are “0”
When , TEST1F is set to "1". Further, when TEST1F=1, TEST1F is reset and TEST2F is set to "1". Also
When TEST2F=1, TEST2F is reset.

FIG. 5 shows the control of the test program branching process, in which the status of TEST2F and TEST1F is checked when the same key processing as above occurs.
If TEST2F=1, the weight display 16 displays the contents of each content storage register in which the contents of the various status switches 61, 62, . . . 6n are written. After that, A/D converter (ADC) 4
Read data from , perform flicker prevention processing, and return to key processing. Also
If TEST1F=1, A/D converter (ADC)
The data is read from step 4, flicker prevention processing is performed at step 4, and the read count number is displayed at step 4. When this display processing is completed, it is then checked whether an ENABLE signal is received from ECR, and if there is no ENABLE signal, the process returns to the key processing, but if there is an ENABLE signal, the process moves to the ECR test routine ETR. In this ECR test routine ETR, the ECR interface 14 is activated and transmits a heavy change signal to the ECR to notify the ECR that a weight change has occurred on the scale.
The preset weight data of 01248 g is stored in the weight register and displayed on the weight display 16.
〓〓Transfer the weight displayed in 〓, that is, the contents of the weight register “01248” to the ECR transfer register (not shown), change the heavy change signal from “H” to “L”, and then send the READY signal to the ECR. Output. thus
The ECR will immediately read the data in the transfer register and display it on its own display. Now, hold the heavy change signal “L” for 0.8 seconds. This results in
The ECR will hold the display for 0.8 seconds while outputting the ENABLE signal. Then, the presence or absence of the ENABLE signal is checked again, and if it is not present, the process returns to the key processing. If there is an ENABLE signal, the working register is cleared with 〓〓, the contents of the working register are displayed on the weight display 16 with 〓〓, and the data transfer processing to the ECR is performed with 〓〓 as in the above 〓〓. Furthermore, output processing of the heavy change signal is performed in the same way as in 〓〓,
Similar to 〓〓, a 0.8 second delay process is performed after the heavy change signal is output. Then, ``11111'' is added to the working register using 〓〓, and the weight overflow flag is checked to see if there is an overflow. This is to check whether the display changes sequentially from "00000" and reaches "99999." And while there is no overflow, if there is an ENABLE signal from ECR,
The display returns to , and the routine repeats.

As described above, in the apparatus according to the embodiment of the present invention, weight data subjected to weight rounding processing is displayed on the weight display 16 in the display processing when a normal weighing operation is performed. For example, if the weight is 15 kg, the display will be as shown in Figure 6a. Further, when the test key 18 is operated, a test program branching process is performed. In this process
If test key 18 is operated while TEST1F and TEST2F are both cleared to “0”
TEST1F=1 and TEST2F=0, and in this state, the count read from the A/D converter 4 is displayed as is on the weight display 16 through the display process. For example, if the count is 32,200 when the weight is 15Kg, the display will be as shown in b in Figure 6. Furthermore, when the test key 18 is operated again in this state, TEST1F=0 and TEST2F=1, and in this state, the contents of the content storage register storing the states of the various status switches 61 to 6n are displayed on the weight display 16. For example, the status switches 61 to 6n are divided into groups that are not operated at the same time, and the operation details of the switches in each group are expressed as numbers 1, 2, etc. If the status switch has been operated, for example, numerical values such as "1", "2", and "3" will be displayed corresponding to the operated switch, as shown in c in Fig. 6.
Informs you about the settings of the status switch.

If the test key 18 is operated again in this state, TEST1F=0 and TEST2F=0, and the display 16 returns to the normal weight display state.

In this way, the weight display 16 is used by operating the test key 18 to switch between displaying the count read from the A/D converter 4 and displaying the operation details of the various status switches 61 to 6n. Therefore, it is not necessary to use a separate display for displaying the count number and the operation details of the switch, and the weight display 16 can be used effectively, so that practicality can be improved.

Additionally, when the weight display 16 is used to display counts, if an ENABLE signal is input from the ECR, a test routine for the transfer route to the ECR is started, so the ECR test routine There is no need to perform a new key operation when switching to , which simplifies key operations.

As described in detail above, according to the present invention, the setting states of a large number of switches for setting whether or not to operate various functions are divided into groups of a plurality of switches in which each switch is not operated at the same time, and each group Since the settings of the switches correspond to numerical values and those values are displayed on the weight display, the weight display can not only be used effectively, but also the setting status of various functions can be clearly displayed on the weight display. It is possible to provide an electronic scale that can display information.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a block diagram, Figure 2 is a diagram showing part of the RAM memory configuration, Figure 3 is the main flowchart, and Figure 4 is test key processing. FIG. 5 is a flowchart showing the test program branching process, and FIG. 6 is a diagram showing various display states of the weight display. 1... Weight sensor, 4... A/D converter, 5... I/
O port, 61, 62,...6n...Status switch, 7...Data processing device, 15...Keyboard,
16...Weight display, 18...Numeric keypad.

Claims (1)

[Claims] 1. A weight sensor that detects the load amount as an electrical analog quantity, an analog-to-digital converter that converts the output of this weight sensor into a count number, a means for taking in the count number from this converter and calculating weight data, and this A weight display device that displays weight data calculated by the means, a plurality of switches that instruct whether or not to enable each of preset various functions, and each of these switches being operated simultaneously with each other. The electronic type is characterized by comprising means for dividing the switches into groups each having a plurality of switches, making the operation contents of each group correspond to a numerical value, and converting the numerical value into weight data and displaying it on the weight display. Scales.