JPH0452903A - Display device - Google Patents

Abstract

PURPOSE:To check the function without requiring a large-scale device by connecting an adapter for signal matching between interfaces and performing the self-diagnosis in accordance with a self-diagnostic program in this state. CONSTITUTION:The self-diagnostic program is preliminarily stored in a memory 3 where system soft for picture switching or the like based on control data is stored, and a function check means is provided which performs the self- diagnosis in accordance with the self-diagnostic program with an adapter C for signal matching between interfaces. Consequently, the adapter C is only connected between interfaces to perform the self-diagnosis of the function by a display device A itself. Thus, the function is checked without requiring a large-scale device at the time of production or maintenance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] The present invention relates to a display device that performs control such as one-screen switching based on control data transmitted from 16 external devices.

[Technology in the United States] Function checks of this type of display device A in the United States were performed using a personal computer B, as shown in FIG. In this case, a checkerboard is prepared on the personal computer B side, and an interface port for input/output with display device A is installed in the expansion slot of personal computer B in order to check the operating status of display device A. The display section responds to Burnal Computer B's check mark! ! I was trying to run A and check its functionality.

[Problem to be Solved by the Invention 1] However, when the functions of the display device A are checked using the personal combinator B or the like as described above, there is a problem that the checking system in the manufacturing process becomes large-scale. Furthermore, when maintaining the display device A, the personal computer B or the like must be used, and there is a problem in that the personal computer B or the like must be carried around at all times.

The present invention was made in view of the above-mentioned fish, and its purpose is to provide a display device that can perform a function check without requiring a large-scale device.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention stores in advance a self-diagnosis program in a memory that stores system components for screen switching based on control data, and interfaces. It is equipped with a function check means that performs self-diagnosis according to a self-diagnosis program with an adapter connected between the two for matching signals.

Note that the present invention can be applied even when the plurality of interfaces include serial interfaces, parallel interfaces, or a serial interface and a parallel interface with different specifications.

[Operation 1] By configuring as described above, the present invention enables the display device to self-diagnose its functions by simply connecting an adapter between the interfaces, without requiring a large-scale device. This allows functionality checks to be performed.

[Example 1 An embodiment of the present invention is shown in FIGS. 1 to 3.

The display device A of this embodiment is an LCD as shown in FIG.
A display unit 1 such as a moziere, a memory 3 that stores a system program, a CPU 2 that controls the display of the display unit 1 according to the system program, a decoder 4 that decodes address data, and external equipment such as a programmable controller. It consists of two serial interfaces (hereinafter referred to as I/F) 5 and 6 that control the input/output of signals to and from the computer, and a power supply circuit 7 that generates power for each part from a commercial power source. The serial I/F 5.6 mentioned above has different specifications, for example, R8-
232C and R8422, R5-422 and R3-485,
They are called R8232C and R8-485.

In the case of this embodiment, a self-diagnosis program is written in the memory 3 in advance. By the way, as shown in FIG.
It is designed to send key power to external equipment such as a programmable controller, etc.

As shown in FIG. 3, the back of the display device A is provided with a dip switch SW + that is operated when performing self-diagnosis. By operating the dip switch SW, various self-diagnosis can be performed. conduct.

Adapter C is for display devices All! Serial I/F5.
6 and a matching circuit 10 for matching signals between the two serial I/Fs 8.9. Note that, as in this embodiment, the interface of the display device A is a serial I/F 5 with different specifications.
．． 6, a matching circuit 10 that matches the voltage levels is used.

When performing self-diagnosis in this embodiment, as shown in FIG.
Connect F5 and F6 and operate dip switch SW to perform self-diagnosis. For example, interface I/F5
, 6 due to failure or disconnection, display check by displaying the test pattern on display 1, operation check of each serial 1/F 5.6 (on, off operation, communication speed, etc.), self Key operation check performed by operating the keys according to instructions from the diagnostic program, and VLED
Check the lights, etc. Note that the results of the function check are displayed on the display section 1. In this way, the function can be checked without using a large-scale device such as a personal computer.

By the way, if the display device A+#4 is equipped with a parallel input I/F 12 and a parallel output I/F 11 as shown in the figure, the adapter C is used to connect each parallel input/output I/F.
If a parallel input/output I/F 13, 14 for inputting/outputting signals from Fl 1, 12 is used, an Im function check can be performed in the same manner as in the case of a serial I/F. In addition, as the matching circuit 10 of adapter C, if the number of inputs and outputs of each parallel input/output I/Fll and 12 is the same, a buffer 7 circuit is used, and if the number of inputs and outputs is different, the number of inputs and outputs is A decoding circuit or the like may be used for matching.

Furthermore, as shown in FIG.
When equipped with F15 and parallel I/F (for example, general-purpose parallel I/F16 or Centronics 17F1.7, or both may be equipped together as shown in FIG. 5),
respective serial I/F 15 and parallel I/F 16,
17, the adapter C@ may be provided with a serial I/F 18 and a parallel I/F 19, and a serial/parallel conversion circuit may be used as the matching circuit 10.

[Effect of the Invention 1] As described above, the present invention stores a self-diagnosis program in advance in a memory that stores system components for screen switching based on control data, and matches signals between interfaces. Since it is equipped with a function check means that performs self-diagnosis according to the self-diagnosis program while the adapter is connected, the display device itself can self-diagnose its functions by simply connecting the adapter between the interfaces. Function checks can be performed without the need for large-scale equipment during maintenance.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the function check operation, Fig. 3 is a perspective view of the display device as seen from the back side, and Fig. 4 is A block diagram showing the circuit configuration of the turtle embodiment, clam 51! 1 is a block diagram showing a circuit configuration of another embodiment, and FIG. 6 is an explanatory diagram of a conventional function check method. A is a display device, C is an adapter, 2 is a CPU, 3 is a memory, 4 is a decoder, 5, 6 . Is is a serial interface, 10 is a matching circuit, and 11, 12, 16, and 17 are parallel interfaces. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) In a display device equipped with multiple serial interfaces with different specifications that perform screen switching, etc. based on control data sent from an external device, and control input/output of signals to and from the external device, based on the above control data. A self-diagnosis program is stored in advance in a memory that stores system software for screen switching, etc., and a function check means is provided for performing self-diagnosis according to the self-diagnosis program with an adapter for signal matching being connected between the interfaces. A display device comprising: (2) In a display device equipped with multiple parallel interfaces with different specifications that perform screen switching based on control data sent from an external device and control input/output of signals to and from the external device, A self-diagnosis program is stored in advance in a memory that stores system software for screen switching, etc., and a function check means is provided for performing self-diagnosis according to the self-diagnosis program with an adapter for signal matching being connected between the interfaces. A display device comprising: (3) In a display device equipped with a serial interface and a parallel interface with different specifications that perform screen switching, etc. based on control data transmitted from an external device and control input/output of signals to and from the external device, the above-mentioned control data A function check in which a self-diagnosis program is stored in advance in a memory that stores system software for screen switching based on the above, and a self-diagnosis is performed according to the self-diagnosis program with an adapter that matches signals between the above interfaces connected. A display device comprising: means.