JPS61169782A - Digital instrument - Google Patents

Abstract

PURPOSE:To enable the discovery of defective points, by mounting a checking specialized ROM on an instrument to check displays, operation switches and other parts. CONSTITUTION:When an error signal is generated during the operation of an instrument or prior to the start of the operation, a checking-specialized ROM40 is mounted on the instrument to determine which hardware parts of the instrument are defective. A processing means 1 checks the hardware at the part where it is interposed by flashing a lamp of a display 2 according to the contents of the checking-specialized ROM40 or by indicating a symbol of a corresponding key on a display 2 upon the pressing of a key on an operation switch 3. This enables the identification of defective parts depending on whether the lamp is lighted as expected or the corresponding display is performed when the key is pressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital instrument that has a display and operation switches and that performs predetermined operations using a microcomputer.

[Prior Art] In recent years, digital instruments such as time meters and recording hands using microcomputers have been developed. Additionally, these instruments have a self-check function, which generates an error signal when a major function of the instrument becomes abnormal while operating according to a predetermined program, bringing the process to a safe side. .

[Problem that the invention seeks to solve]

However, when an error occurs in a meter, it is difficult to know which hardware part or part of the meter has become defective without using a measuring device or the like.

In view of the above points, it is an object of the present invention to provide a digital meter that makes it possible to easily find defective locations.

Means for Solving Problem E] This invention provides a digital instrument that has a display, an operation switch, and performs predetermined operations using a microcomputer, and a check-only ROM is attached to the instrument, and the display, operation switch, etc. This is a digital instrument designed to check the parts of the body.

[Embodiment] FIG. 1 is a configuration explanatory diagram showing an embodiment of a controller according to the present invention.

In the figure, reference numeral 1 denotes a processing means that performs adjustment calculations and other processing according to settings data stored in a RAM 41 and programs stored in a ROM 41 by operating an operation switch 3 with reference to a display 2; , output is possible.

Here, in order to determine which hardware part of the meter is defective when the meter generates an error signal during operation or before starting operation, a check-only ROM 40 is attached to the meter.

Then, as shown in FIG. 2, the processing means 1 causes the lamp on the display 2 to blink according to the contents of the check-only ROM 40, or when a key on the operation switch 3 is pressed, the symbol of the corresponding key is displayed on the display. 2, and checks the hardware of the part where the processing means 1, such as a microcomputer, intervenes. In other words, the location of the defect can be determined by whether a lamp that should be lit is lit, whether a corresponding display appears when a key is pressed, etc.

〔Effect of the invention〕

As mentioned above, this invention performs checks by attaching a ROM dedicated to hard checks to instruments.
It becomes possible to discover defective parts and abnormal parts very easily and quickly.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Processing means, 2...Display device, 3...Operation switch, 41.RAM, 42.ROM, 40-
・Check-only ROM

Claims (1)

[Claims] 1. In a digital instrument that has a display, operation switches, and performs predetermined operations using a microcomputer, a check-only ROM is attached to the instrument to check the display, operation switches, and other parts. digital instrument.