JPS59171992A - Sentence display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a text display device, and more particularly to a text/chapter display device equipped with an abnormality detection function of a text display command.

A conventional text display device includes, for example, an operation control unit (microcomputer) that controls the operation of a copying machine, a text display control unit that outputs a display signal according to a control signal of the operation control unit, and a text display control unit that outputs a display signal according to a control signal of the operation control unit. For example, when the amount of toner in a copying machine is insufficient, the operation control section outputs a control signal corresponding to the insufficient amount of toner to the text display control section. Outputs a display signal according to the insufficient amount of toner. When the display signal is output, the message "Please add toner" is displayed. ◇This text display device also displays the message "Please add toner" on the text display. It also has a function to check for abnormalities in the control signal, such as those that occur when noise enters the signal transfer system, and to display an abnormality indication on the display section.

However, in a text display device equipped with such an abnormality detection function, when an abnormality is detected, the text display device becomes deadlocked in an abnormal state immediately. That is, the display section was maintained in an abnormal display state, and the text display function was not restored unless the operator turned on the power switch after turning off the power switch. Therefore, the copying operation is often interrupted even when an abnormality due to the above-mentioned noise occurs, resulting in a decrease in the efficiency of the operation.

Purpose of the Invention The purpose of the present invention is to continue the abnormality test and eliminate the abnormal condition without fixing the text display function to the abnormal state in response to the abnormality of the control signal caused by noise contamination in the transfer system as described above. It is an object of the present invention to provide a text display device that can automatically restore a text display function.

Structure of the Invention The text display device of the present invention is provided with means for counting the number of abnormality detections of text display commands, and causes the signal processing means to display an abnormality on the display unit when the counting child reaches a predetermined value. In addition, the present invention is characterized by having a function of continuing the abnormality test for the text display command and automatically returning the display section to the normal state when normality is restored.

BACKGROUND OF THE INVENTION The text display device according to the present invention will be explained in detail below. Fig. 1 shows an embodiment of the present invention. a microcomputer 3 that controls each part of the copying machine; a text display control unit 4 that inputs signals from the microcomputer 3 and outputs display signals according to the signals; It has a display section 5 (the display panel 6 is shown inside the operation panel 2) for displaying information. The text display control unit 4 includes a CPU (signal processing unit) 7 that performs arithmetic processing on input signals;
Sequence for reading the signal from the microcomputer 3 (status signal indicating the status of the copying machine 1), inspecting the transferred signal, and determining the text to be output according to the display command if there is no abnormality in the inspection results, and managing the output time of the text. etc., a text ROM 9 that stores character code strings of a plurality of different predetermined display texts, and a text ROM 9 that stores character codes read from the text ROM 9 in response to display commands. It has a RAM 12 that stores columns, and a character generator 10 that generates letters and turns based on the contents stored in the RAM 12 (note that 11 is an input/output port).
.

The display unit 5 has a display panel 6 made of a liquid crystal display device or a fluorescent discharge tube, etc., and a shifter whose display timing is controlled by a timing signal from a timing counter circuit 13 and outputs a drive signal according to a pattern signal from a character generator IO. A register 14, an X-driver 15 that is driven by a drive signal and outputs a lighting signal that causes the display panel 6 to light up dots according to letters and turns, and an X-driver 15 that develops a timing signal and outputs a drive signal that corresponds to dynamic lighting. and a Y-driver 17 that is driven by a drive signal and dynamically displays a character gloss turn based on the lighting signal.

Furthermore, in the text display control section 4 shown in FIG. 1, the CPU 7 detects an abnormality in the transfer system between the information transmission output interface 18 and the information reception input/output port 110 in the copying machine control section 3, as will be described later. An error counter 19 is provided which counts the number of times an abnormality is detected when detected. Also CPU
A periodic signal for transfer is input to 7, and this CPU
Reference numeral 7 has a function of detecting an abnormality in the transfer data sent by the transfer system and also detecting an abnormality in the transfer synchronization signal.

Furthermore, as described later, the CPU continues to check the normality of the transfer system even after detecting an abnormality in the transfer system and displaying it on the display, and when the transfer system returns to normal, the CPU continues to check the normality of the transfer system. An automatic normal recovery function is also provided to allow normal display.

Based on the above configuration, text display operations will first be explained.

For example, when the user temperature of the fixing section of a copying machine reaches a predetermined value, the microcomputer 3 to which the temperature signal has been input outputs a control signal corresponding to "One copy can be made." The control signal is a second
As shown in the figure and Figure 3 (a), it is a 30-byte signal, the 1st byte is the start code 'A', the 30th byte is the stop code '55', and the 29th byte is the 1st byte. This is a checksum representing the sum of information from 1 to 2 G bytes. Furthermore, this control signal is a transfer synchronization signal generated by the microcomputer 3, that is, the third
It is controlled by a synchronizing signal for transfer shown in FIGS. (b) and (c) (a signal that pauses for left θ77LS after outputting a tmS cycle pulse for /left OaS) and is input to the text display control unit 4. In the text display control section 4, the control signal is C.
The text is decoded by the PU 7 (according to the ROM 8's glograph U.) and the corresponding text number is determined. When the address of the text ROM 9 corresponding to the determined text number is designated, the corresponding character code string is transferred to the RAM 12.

A character font (font) stored in the ROM 8 is read out using this character code string as part of the address, and written into the RAM 1'z while access is controlled by a signal from the timing counter 13. R
The character generator 10 generates a character pattern based on the memory contents of the AM 12, and this display pattern is read out and taken into the shift register 14. When the shift register 8 drives the X-driver 15 and outputs a lighting signal, the Y-driver 17 sequentially scans the display panel 6 using the dynamic lighting control signal and displays, for example, "Copy ready".

The display operations on the above text display device are shown in Figure 3 and Figure 3.
The transfer data test is started by clearing the transfer data test and synchronization signal test shown in the figure, and the transfer data tests include a start code test for the 1st byte, a check sum test for the 29th byte, and a stop code test for the 30th byte. An inspection will be carried out.

The CPU 7 of the text display control unit 4 receives a periodic signal from the microcomputer 3 (Fig. 3(b)
and (c)), the /sec timer is set and the start code is checked using the first data sent. At this time, the read data counter (not shown) of the CPU 7 is set to 1. . By checking whether the start code is like this, if it is not the predetermined code, it is determined that the transfer synchronization signal is not a synchronization signal but a noise or other signal, and the read data counter continues to increment at 1. do not have. That is, it continues to ignore the received data without proceeding until the start code arrives at the first byte.

Only when the start code is received in the first byte, the 1st READ Flag is cleared and the read data counter is incremented, and the 2nd to 3rd θ bytes are read every time a synchronization signal is received until the 30th byte is received. Load data up to. When reading the 30th byte,
Set the 1st READ Fla knife, and this, the 30th
Check if byte is a stop code. If it is a specified code, calculate the sum (checksum) of the data from the 1st byte to the 2nd gbyte and compare it with the data indicating the checksum value of the 29th byte. If there is no abnormality, the previous one is If it is an error, after clearing the error count or synchronization signal error 7 lag, microcontroller 3
A flag indicating that the transferred data has been successfully received, that is, Flog is set to transfer 0, and the process proceeds to the above-mentioned text output display process.

If the 30th byte is not a stop code, data error processing is performed (see Figure S (a)).

In this data error processing operation, each time an abnormality is detected, the error counter 19 is counted up and the read data counter is initialized to 1.

The error count becomes 70 times or more, that is, abnormality detection is performed 70 times or more, and an error message is displayed on the water and display unit 6. If the error count is less than 70, the abnormality test is repeated without displaying an error display on the display. In this way, when an error is displayed and the error count is 70
In any case, the value of the read data counter is initialized to 1 in order to receive the first tweet. In other words, the abnormality inspection continues even after the error is displayed.

Similar to the stop code test, if an abnormality is found in the checksum verification test, the data error processing described above is performed. (However, the checksum check is not performed for the first furnace in which an error is detected in the stop code.) On the other hand, the synchronization signal test is performed in accordance with the flowchart shown in FIG. 5(b). That is, each time a synchronization signal interrupts from the microcomputer 3, the CPU 7 of the text display control section 4
sets the /see timer, and when the timer times out, it is determined that there was no synchronization signal for /5ecO, and an error is displayed on the display unit 6 as a synchronization signal error. In this case, as in the case described above, even if an error is displayed, the value of the read data counter is initialized to 1 in order to receive the number/byte, and the abnormality check is continued.

While performing the transfer data check 1 and synchronization signal check in this way, the CPU 7 processes only the normal signals from the microcomputer 3 and performs display operations, and when an abnormality is detected, it displays an abnormality instead of text display. On the other hand, in order to avoid deadlock during normal display, the read data counter is initialized to 1, and even during abnormal display, the sample continues to be detected overnight by receiving the periodic signal from microcomputer 3. , has an automatic normal return function that starts the original normal display operation when escaping from an abnormal state.

Effects of the Invention Since the signal processing unit (CPU 7) of the Bumioki display differential of the present invention is provided with the above-mentioned automatic normal return function, the watchdog timer (microcontroller) in the copying machine control unit 3, for example,・In computer control systems, transfer systems that are not detected by the real-time clock are used to periodically clear the timer and determine an abnormality when it times out in order to check that it is operating normally. This prevents the text display device from being deadlocked due to a temporary abnormality, and after the normal operation is restored, it is possible to operate the display device without any trouble as usual.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a computer main body and a control unit incorporating the text display device of the present invention, Fig. 2 is an explanatory diagram showing an example of data transferred to the text display device of the present invention, and Fig. 3 (a),
3(b) and 3(C) are explanatory diagrams showing transfer synchronization signals for the above-mentioned transfer data, and FIGS. It is a flowchart showing the operator 111 in the display device. 1...First 8 steps, 2...Operation controls, 3...Copier control unit (microcomputer), 4.
...Text display control unit, 5...Text display section, 6'... Display panel, 7...
Signal processing unit (CPU), 8...R for program
OM, 9...Text ROM, 10...
...Character generator, 11...
Input/output, 12...RAM, 13.
...timing counter circuit, 14...
...Shift register, 15...×-driver, 16...Decoder, 17...
... Y-driver, 18 ... Output interface, 19 ... Error counter. Figure 2 - Transfer byte number 5 in Figure 3 10 (A) Figure (B) ^

Claims (1)

[Claims] a text storage memory that stores a predetermined display text; a signal processing unit that, when receiving a text display command, checks for an abnormality in the command and reads a display text corresponding to the command from the text storage memory; A text display device comprising: a display unit for displaying displayed texts, wherein means is provided for counting the number of times an abnormality is detected in the text display command, and the signal processing unit includes:
Means is provided for displaying an abnormality on the display unit when the counting means reaches a predetermined value, continuing the abnormality test for the text display command, and automatically returning the display unit to the normal state when normality is restored. A text display device featuring: