JPS6341116B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a price data checking device for a vending machine in which price data is stored in an electronic memory.

Conventional technology When using a microcomputer as a control and calculation device for a vending machine, price data of products to be sold is stored in RAM (random access memory), and the price data is transferred to RAM at the time of sale.
There are cases where a sales operation is performed based on the read price data. In this type of vending machine, the RAM is backed up by a battery and is configured to save price data even in the event of a power outage, but if the battery deteriorates due to a long power outage, the RAM The stored price data is corrupted and an error occurs.

Conventionally, the method for detecting the above-mentioned error is to determine that there is an error if each digit of the price data set in the binary coded decimal code read from the RAM is a number of ``10'' or more after the power is restored. There is a way.
However, with this method, the battery deteriorates and
If the data stored in the RAM is corrupted, the corrupted data may be less than "9", and in this case there is a drawback that the error cannot be detected.

Problems to be Solved by the Invention The present invention has been made to eliminate the above-mentioned drawbacks, and provides a vending machine in which price data is stored in an electronic memory such as a RAM.
The object of the present invention is to provide a check device that can reliably detect destruction of stored data.

Means for Solving the Problems The present invention provides a data check device for an electronic memory of a vending machine which stores price data in an electronic memory such as a RAM and reads out the stored price data to perform a vending operation. As shown in the figure, there is a rewritable electronic memory that stores various data and a plurality of check codes having the same contents and is backed up by a battery, a fixed memory that stores check codes with the same contents as above, and a fixed memory that stores check codes with the same contents as above. , a data collation means that mutually collates the check code of the fixed memory and the check code of the electronic memory, and a determination result of the data collation means that the check code of the fixed memory and the check code of the electronic memory are in a mismatched relationship. The present invention is characterized by comprising display control means for controlling the display device to display an error message at certain times.

Effect: In a vending machine configured as described above to store price data in an electronic memory, after recovery from a power outage, the check code stored in the fixed memory and the check code stored in the electronic memory are applied to the data matching means. The data collation means determines whether or not the two check codes are in a matching relationship, and if the determination result is a mismatch, it applies a signal to the display control means to display an error. As a result, the display control means causes the display device to display an error message.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a control device (verification means, display control means) for controlling sales of a vending machine, and for example, a microcomputer is used. In this embodiment, a vending machine with a so-called 20 selection function that allows selection of 20 products will be described. In this type of vending machine with multiple selection functions, a push button switch is provided for each selection, and when a predetermined amount of money is inserted into the vending machine, the push button switch of any selection is turned on. Then, the products of the selected selection will be delivered.

A ROM (read only memory) 1a serving as a fixed memory of the control device 1 is written with check data _C0 for checking the storage status of the RAM, which will be described later, in addition to a normal vending machine control program.

Reference numeral 2 denotes a RAM (random access memory) that rewritably stores various data necessary for selling products and the sales price (set price) of the corresponding product for each selection.
Addresses 1 to 20 are storage areas for product price data for each selection, addresses 21 to 24.
The address is a storage area for sales amounts, and addresses 25 to 40 are storage areas for check data. The code of the check data is the same as the code of check data _C0 stored in the ROM 1a. In the following description, the check data stored in the RAM 2 will be written as C ₁ , C ₂ , . . . C _o in address order.

3 is a battery for backing up RAM2 in the event of a commercial power outage;
is connected to the power supply terminal of RAM2 via diode 4.

5 rectifies the commercial power supply, controls the control device 1, and the RAM
The RAM 2 is a power supply circuit that supplies DC power to the RAM 2, and its DC output terminal is connected to the control device 1 and also connected to the power supply terminal of the RAM 2 via a diode 6.

7 is a key input device including a numeric keypad for inputting sales price data for each selection and various other data necessary for controlling the vending machine; the data input from this key input device 7 is input to the control device 1; It is written to RAM2 via

8 is a display device, and 9 is a commercial power supply recovery detection device. When the power restoration detection device 9 detects that the power is turned on, the control device 1 detects whether the data in the RAM 2 is healthy according to the program shown in FIG. This program is written in the ROM 1a in the control device 1.

If the commercial power supply is cut off, a predetermined voltage is supplied from the battery 3 to the RAM 2, and the data in the RAM 2 is saved. However, if the battery 3 is exhausted due to a long power outage, the data in the RAM 2 will be destroyed. Now, for example, check data for address 26.
Suppose that C ₂ becomes 0. It is assumed that other check data is sound.

When the power is restored, power-on is detected in step S1 by a signal from the power restoration detection device 9, and all outputs are turned off in step S2, and then in step S3.
Set the contents of the counter CT (not shown) in the control device 1 to 1, specify address 1 of RAM 2, read the data at address 1 (S4), and check whether each digit of the data is greater than or less than "10". (S5). if
If it is less than 10, proceed to step S6 and count the counter.
Add 1 to CT, specify address 2, perform the above check, and return to step S4 until the contents of counter CT reach 24, and check each check data C ₂ to _{C 15.}
Perform the above checks for

If one digit of the read check data is ``10'' or more, the process advances to step S12, and the display device 8 displays an error.

In the above check, if there is no abnormality in the data in RAM2, the process advances to step S8 and the counter is
The content of CT is set to "25", address 25 of RAM 2 is designated again, and check data "C ₁ " at address 25 is written to a register (not shown) in control device 1.

On the other hand, check data _C0 of the ROM 1a is also read and written to other registers. And step S
At step 9, the contents C ₀ and C ₁ of both registers are compared.
If the data in RAM2 is correct, C ₀ = C ₁ ,
Proceed to step S10, add 1 to the counter,
Address 26 of RAM is designated and the process returns to step S8 via S11. And check data C ₂ at address 26
is read out and compared with check data _C0 of ROM1a. In this example, check data C ₂ is corrupted and becomes 0, so C ₀ ≠ C ₁ , and step S
The process proceeds to step 12, where the display device 8 displays an error.

When an error message is displayed, it is determined that the data in RAM 2 is corrupted, the staff replaces the battery, and then inputs the correct sales price data again from the key input device 7, and sells as shown in Figure 2. Rewrite the price data and also rewrite the check data C ₁ to C ₂₀ .

If it is determined by the checks in steps S4 to S11 that the data stored in the RAM 2 is sound, the process moves to a sales standby routine.

In addition, during the sales operation, the sales price data in RAM 2 is taken into the control device 1 for each selection.
Based on the sales price data, whether the sale is possible or not,
Change calculations, etc. are performed.

Effects of the Invention As detailed above, according to this invention,
A vending machine that stores price data in a rewritable electronic memory such as RAM stores multiple specific check codes in the electronic memory, and fixes the check codes when the power is restored. It is controlled so that the check code written in the memory is compared with the check code written in the memory, and if there is a discrepancy, a storage error is detected and the error is displayed on the display means, so it is possible to ensure that the data in the memory has not been destroyed due to a power outage. It can be detected immediately, and sales can be stopped in the event of data destruction, as opposed to sales after the power is restored.
Therefore, it is possible to improve the reliability of the device against sales due to data destruction.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of this invention, FIG. 2 is a diagram showing an example of a RAM storage system in an embodiment of this invention, and FIG. 3 shows the operation of the embodiment of FIG. 1. The flowchart, FIG. 4, is a complaint correspondence diagram. 1...Control device, 1a...ROM, 2...RAM, 3
... Battery, 8... Display device, 9... Power recovery detection device.

Claims (1)

[Scope of Claims] 1. In a data check device of an electronic memory of a vending machine that stores price data in an electronic memory such as RAM and reads out the stored price data to perform a sales operation, the same content as various data is provided. A rewritable electronic memory that stores a plurality of check codes having the same content and is backed up by a battery, a fixed memory that stores check codes with the same content as above, and a fixed memory that stores the check codes of the fixed memory and the electronic If the check code of the fixed memory and the check code of the electronic memory do not match according to the judgment result of the data matching means and the check code of the memory, an error is sent to the display device. 1. A data check device for an electronic memory of a vending machine, comprising display control means for controlling display.