JPS63149739A - Electronic equipment - Google Patents

Abstract

PURPOSE:To accurately and easily detect which part in a hardware circuit relating to an I/O equipment is abnormal within a short period by specifying any one of output ports at the time of setting up a self-diagnosis mode and writing optional data in the output port. CONSTITUTION:In an electronic equipment constituted by connecting plural I/O ports C to a CPU A through a data bus line B, the self-diagnosis working mode is set up by a self-diagnosis mode setting means D, any one of the output ports is specified by a port specifying means E at the time of setting up the self-diagnosis mode and optional data are written in the specified output port by a data writing means F. Thus, whether abnormality is generated in the output port or not can be decided by writing optional data in a required output port and detecting output data from the output concerned.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electronic device having a self-diagnosis function.

[Prior Art] Conventional electronic equipment with a self-diagnosis function, such as an electronic cash register, has a self-diagnosis program for checking the operation of each input/output device, such as a program for checking the operation of a printer, a network control device, etc. (N
CtJ) operation check programs, etc., are independently set in the storage section for each input/output device, and these programs are sequentially executed in response to predetermined operations. When the operation check program is executed and all functions of the hardware circuits related to the input/output device are normal, information indicating that the self-diagnosis results are normal is sent from the display of the electronic device or the output device such as a printer. It is output and notified to the operator. on the other hand,
When at least a part of the function of a hardware circuit related to each input/output device is abnormal, information indicating that the self-diagnosis result is abnormal is output, and the function is stopped.

[Problems to be Solved by the Invention] However, although an operator can determine that at least some of the hardware circuits related to the input/output device are abnormal by executing a check program, many hardware circuits are abnormal. It was difficult to determine in which part the abnormality was occurring. Therefore, when an abnormality occurs, it is necessary to inspect all of the relevant input/output devices.
It is very complicated and requires a long time to repair.
It was inefficient.

On the other hand, it is possible to improve each operation check program and add a function to determine which part of the hardware circuit is abnormal, but in this case, the capacity of the self-diagnosis program would be enormous and the cost would be high. Problems such as an increase in

Therefore, the present invention enables self-diagnosis to easily determine which part of the hardware circuit related to the input/output device is abnormal, accurately and in a short time, which is very efficient and reduces cost. The purpose is to provide electronic equipment that does not pose any risk of harm.

[Means for Solving the Problems] As shown in FIG. The business mode of diagnosis is set by the self-diagnosis mode setting means, and when setting the self-diagnosis mode, one of the output ports is designated by the port designation means E, and the data writing means F writes data to the designated output port. This allows arbitrary data to be written.

In addition to the above means, the present invention is such that when an input port is designated by the port designation means E, the data display means G reads and displays the input data to the input port.

[Operation] By taking the former method, arbitrary data is written to the desired output port, and by detecting the output data from the output port at this time, it is possible to determine whether an abnormality has occurred in the output port. You can judge whether

In addition, by taking the latter measure, not only the abnormality of the output port but also the data input to the desired input port will be displayed, so detecting this displayed data will cause an abnormality to occur in the input port. It is possible to judge whether or not the

[Example] An electronic cash register will be described below as an example of the electronic device of the present invention.

FIG. 2 is a functional block diagram showing the electronic cash register of this embodiment. In the figure, reference numeral 1 denotes a central processing unit (hereinafter abbreviated as CPU), which incorporates an arithmetic circuit, a memory control circuit, etc., performs various arithmetic processing based on input data, and also operates an address bus 2. A ROM 5 that stores fixed data such as programs for executing various tasks and a RAM 6 that stores variable data such as input data are operated via a data bus 3 and a control signal line 4. In addition, a keyboard controller 8 inputs key signals from a keyboard 7 for inputting product sales data, etc., and a display controller drives a display 9 for displaying sales amount 1, total amount, etc., and displays characters corresponding to the display data. A printer controller 1 that controls the drive of a printer 11 that prints on 10 sheets and journals.
2 and the control key controller 14 which inputs command signals from the control key 13 via the pass line 3 and the control signal line 4 □r the cPL 11
It is connected to the.

As shown in FIG. 3, the control key 13 controls the on/off of ML and also controls to instruct the CPU to execute various tasks such as "registration", "payment", "setting", and "self-diagnosis". It is a switch, and the user selects a job by turning a key. However, if the key is in the possession of a store manager, etc., the key will only turn from the "setting" to "checkout" positions, and the key, which can be turned to "self-diagnosis", is in the possession of the service technician who manufactures the electronic cash register. Generally, the execution of programs for "self-diagnosis" work is limited to service technicians and is not done indiscriminately.

In addition, the keyboard 7 also displays the sales amount, as shown in FIG.
A number key 21 for entering the number of sales items, etc., a department key 22 for declaring department registration, a deposit/cash total key 23 for calculating the total amount, and a PL for declaring PLU registration.
In addition to product registration keys such as the U key 24, various function keys such as a replacement key 25, a clear key 26, and a cancel key 27 are provided.

Further, controllers 8 14 for connecting external input devices such as the control keys 13 and the keyboard 7 are each connected to the path line 3 via one or more input ports, and are connected to the display 9 and the printer 11 .
Controller 10.12 for connecting external output devices such as
are each connected to the path line 3 via one or more output ports. These input ports and output ports are each addressed by the CPUI, and in response to an address designation signal from the CPU 1, the input/output port having the corresponding address operates.

FIG. 5 is a schematic diagram showing an example of the connection state to the input/output ports, and the input port 31 is connected to the control key 1.
3, and the output port 32 is used to send some of the various control signals to the printer 11. Furthermore, the current state of the output port 32 is maintained by the latch signal S.

Thus, the CPU 1 is configured to operate according to the procedure shown in FIG. That is, keyboard 7
If a key signal is input from , the state of the control key 14 is determined in ST1. Here, if the "self-diagnosis" business mode is selected by the control key 14, the process moves to ST2, and if another business mode is selected, the processing program corresponding to each business is stored in the ROM 5.
Read from and execute. In ST2, it is determined whether the input key signal is the numeric data "99" from the numeric key 21, and if it is other than the numeric data "99", an operation check signal corresponding to the numeric data is used. The program is sequentially read from the ROM 5, a self-diagnosis is executed, and a message indicating normality or abnormality is displayed on the display 9.

On the other hand, if the numeric data "99" is input, ST
3, the replacement key 25 has input, and here the replacement key 2
If a key other than 5 is input, an error will occur. ST
When the replacement key 25 is input at step 3, the self-diagnosis input/output port control program is read from the ROM 5 and executed.

That is, as ST4, the CPU 10 waits for the input of the numeric key 21, and when numeric data is given from the numeric key 21, this data is stored in a predetermined area of the RAM 6. Next, in ST5, it is determined whether the numeral data is a 5-digit numeral, and if it is not a 5-digit numeral, the numeral data is cleared and the process returns to ST4.

On the other hand, if the number data consists of five digits, it is determined in ST6 whether or not the first digit of the number data is "1". Here, if the first digit is "1", the control program for the output port is executed, and if it is other than "1", the control program for the input port is executed.

The control program for the output port first converts the second to fifth digits of the set number data stored in a predetermined area of the RAM 6 into hexadecimal numbers in ST7, and displays this converted value on the display 9. Next, in ST8, the system waits for the input of numeric data, and when the numeric data is input from the numeric key 21, the data is stored in a predetermined area of the RAM 6. Then, in ST9, it is determined whether the entered number data consists of 4 digits or not, and if data other than 4 digits is entered, the data is cleared and the process returns to ST8.

If the number data consists of 4 digits in ST9, 5T1
This number data is divided into two upper digits and two lower digits, and it is determined whether the values of these two digits are both within the range (0 to 15).

If both two-digit data are within the range, in ST11, these two-digit data are each converted into hexadecimal numbers and displayed on display B9.

Next, specify the output port having the address corresponding to the value of the hexadecimal data displayed in ST7, and write the hexadecimal data displayed in 5T11 to this output port. After that, the state of the control key 13 is determined,
If it is in the "self-diagnosis" mode, the process returns to ST4.

On the other hand, the control program for the input port is 5T12
The second to fifth digits of the five-digit number data stored in a predetermined area of the RAM 6 are converted into hexadecimal numbers, and this converted value is displayed on the display 9. Next, an input port having an address corresponding to the value of the displayed hexadecimal data is designated, and the input data to this input port is read and displayed on the display 9. After that, the state of the control key 13 is judged, and if it is in the "self-diagnosis" mode, the
Return to T4.

In this embodiment configured in this way, a service technician automatically performs
When performing self-diagnosis, operate as follows. First, the service technician inserts a specific key in his or her possession into the control key 13 and turns it to select the "self-diagnosis" mode.

Next, the numeric key 21 on the keyboard 7 is operated to input numeric data "99", and the alternate key 25 is further input to read the input/output port control program from the ROM 5. Here, when performing self-diagnosis of the output port,
Enter 5-digit numeric data in which the first digit is "1" and the second to fifth digits are the address number designated for the output port. Then, the address part of the above digit data will be converted to hexadecimal and displayed on the display 9.
After confirming this display, the service technician enters arbitrary data using four digits in the range of 0 to 15, with the upper and lower two digits each being 0 to 15. Then, this four-digit numeric data is converted into a hexadecimal number and displayed on the display 9, and furthermore, this data is output to the addressed output port.

Therefore, by detecting output data from the output port, a service technician can determine whether there is an abnormality at the output port.

On the other hand, when performing self-diagnosis of an input port, enter 5-digit numeric data with the first digit set to something other than "1" and the second to fifth digits set to the address number specified for the input port. Count. Then, the address portion of the numeric data is converted to hexadecimal and displayed on the display 9, and the service engineer confirms this display. Thereafter, the data input to the input port designated by this address is successively output and displayed on the display 9. Therefore, by checking the display on the display 9, a service engineer can determine whether there is an abnormality at the input port.

In this way, according to this embodiment, abnormalities at each person and at the output port can be quickly detected through manual operation by a service engineer. Therefore, for example, a self-diagnosis program is initially used to automatically perform a self-diagnosis, and when an abnormality is output, the address of the input/output port related to the input/output device in which the abnormality has occurred is sequentially specified manually using keys. By doing this, it is possible to quickly detect which input/output port has an abnormality, and as a result, by inspecting the circuit connected to the input/output port determined to be abnormal, the abnormal part can be reliably and shortened. You can figure it out in time. Moreover, since the input/output port control program is simple and can be executed using the ordinary keyboard 7 and display 9, it can be realized at low cost.

Note that the present invention is not limited to the above embodiments.

For example, in the embodiment described above, output data from an output port or input data to an input port may be detected by using an oscilloscope, and normality or abnormality may be determined based on the detected waveform. . Further, although an electronic cash register was exemplified as an electronic device in the above embodiment, it goes without saying that any electronic device having a data input device such as a keyboard and a data output device such as a display can be applied. It goes without saying that various other modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to easily determine which part of the hardware circuit related to the input/output device is abnormal accurately and in a short time through self-diagnosis. It is possible to provide an electronic device that is very efficient and does not cause a risk of cost increase.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the functional configuration of an electronic device according to the present invention, and FIGS. 2 to 6 are diagrams showing an embodiment in which the present invention is applied to an electronic cash register. Functional block diagram of the cash register, Figure 3 is a schematic diagram specifically showing the control keys, Figure 4 is a schematic diagram showing the key arrangement of the keyboard, and Figure 5 is a diagram showing an example of the connection state to the input/output port. , FIG. 6 is a flowchart showing the operating procedure during self-diagnosis in the CPU. 1...CPU, 5...ROM, 6...RAM, 7
...Keyboard, 9...Display device, 13...Control key, 21...Number key, 25...Alternative key. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) Self-diagnosis mode setting means for setting a business mode for self-diagnosis in an electronic device in which a plurality of output ports are connected to a central processing unit via a data bus line, and setting of the self-diagnosis mode by this setting means. 1. An electronic device comprising: a port specifying means for specifying any one of the output ports at a time; and a data writing means for writing arbitrary data to the output port specified by the specifying means. (2) A self-diagnosis mode setting means for setting a business mode for self-diagnosis in an electronic device having multiple input/output ports connected to a central processing unit via a data bus line; a port specifying means for specifying one of the input/output ports when setting the input/output port; a data writing means for writing arbitrary data to the output port when an output port is specified by the specifying means; and the specifying means. 1. An electronic device comprising: data display means for reading and displaying input data to an input port when the input port is designated by the input port.