JPH0571107B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention displays an abnormality when an abnormality occurs in the transfer between a text display device and an external control unit, and displays an error message when the abnormality is recovered. The present invention relates to a text display device capable of quickly performing recovery processing to return to normal display.

[Conventional technology]

As a conventional text display device, for example, JP-A-59
- There is one shown in No. 68056. This text display device is equipped with two types of timers, a skip flag, and an error counter, and the CPU of the text display control unit uses two types of timers (40ms and 60ms) each time a synchronization signal interrupts from the copying machine control unit. and set
Check the start code to determine whether to set a skip flag, check the stop code based on this flag, execute data error processing, and count up the error counter until 10.
If an error is detected more than once, an error is displayed, and if no synchronizing signal is input before the 600ms timer times out, a synchronizing signal error is determined and an error is displayed.

With such a configuration, when an abnormality is detected during a display command, text display is stopped and an abnormality is displayed instead, so that erroneous display on the text display section can be prevented.

[Problem that the invention seeks to solve]

However, in the case of conventional text display devices, since the display of transfer information when an error occurs is aimed at field engineers, there is a problem in that it is not possible to quickly update the information after an error occurs. Further, the configuration for inspecting the transferred information was complicated.

[Means and effects for solving the problem] The present invention has been made in view of the above, and in order to quickly recover from an abnormality, the information content is inspected and serial communication is performed in the event of an abnormality. To provide a text display device that displays an error text, continues monitoring even after an abnormality is detected, and changes to normal display upon recovery.

〔Example〕

Hereinafter, the text display device according to the present invention will be explained in detail.

FIG. 1 shows an embodiment of the present invention, in which a text display device includes a copying machine control section 1 that controls various parts of the copying machine by inputting signals from various sensors and operation panels of the copying machine.
, a text display control section 2 that inputs a signal from the control section 1 and outputs a display signal according to the signal, and a display 3 that displays a text according to the display signal when the display signal is input. The text display device 2 includes a CPU (signal processing section) 4 that processes input signals, an input interface 5 that receives signals output from the output port 14 of the copying machine control section 1, and a transfer system or copying machine control section. It has a built-in program that inspects the normality of 1 and displays this error text on the display 3 in the event of an abnormality, continues the abnormality test of the text display command, and returns the display contents to the normal state when normality is restored. Furthermore, it has a built-in text ROM that stores character code strings for a plurality of predetermined display texts.
Soft cassette 6 that can be attached to and detached from the text display control unit 2
, a RAM 7 that stores character code strings read from the text ROM in response to display commands, and the RAM.
The display timing is controlled by the timing signal of the character generator 8 which generates a character pattern based on the memory contents of the character generator 7 and the timing counter circuit 13, and the drive signal according to the pattern signal of the character generator 8 is output. a shift register 9 that is driven by a drive signal, and a display 3 that is driven by a drive signal.
an X-driver 10 that outputs a lighting signal that lights up dots according to a character pattern; a decoder 11 that develops a timing signal and outputs a drive signal corresponding to dynamic lighting; It is composed of a Y-driver 12 that dynamically displays a character pattern based on a signal.

As shown in FIG. 2, the soft cassette 6 is a memory consisting of a control software section 61 (for example, 5 kilobytes capacity) and a sentence section 62 (for example, 11 kilobytes), and the control software section 61 stores the status of the copying machine. A sequence for reading and inspecting the transferred information, determining a text to be outputted, and a program for managing the output time of the text are stored.

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 copying machine control section 1 to which the temperature signal has been input outputs a control signal corresponding to "Copy ready". As shown in FIGS. 3 and 4a, the control signal is a 10-byte signal for one reversal data, and is a transfer synchronization signal generated by the copying machine control section 1, that is, as shown in FIG. Transfer synchronization signals shown in b and c (pulses for 10 bytes are output during 100mSec)
and is input to the text display control section 2. In the text display control section 2, the control signal is
The text is decoded by the CPU 4 (by the program in the soft cassette 6) and the corresponding text number is determined. When the address of the text ROM corresponding to the determined display number is specified, the corresponding character code string is
Transferred to RAM7. Character fonts stored in the soft cassette 6 are read out using this character code string as part of the address, and written into the RAM 7 while access is controlled by the signal from the timing counter 13.
A character generator 8 generates a character pattern based on the contents stored in the RAM 7, and this display pattern is read out and taken into a shift register 9. When the shift register 9 drives the X-driver 10 and outputs a lighting signal, the Y-driver 1
2 is the indicator 3 by the dynamic lighting control signal.
are scanned sequentially and the message ``Ready to copy'' is displayed.

The display operation in the text display device described above is started by clearing the transfer data test and the synchronization signal test shown in Fig. 5 and Fig. 6 A, B, and C. As the transfer data test, the first byte A start code check, a checksum check of the 9th byte, and a stop code check of the 10th byte are performed.

Reading of the information to be transferred is performed by interrupting with a reception completion signal input to the CPU 4, checking the transferred information, and activating the reading program. Inspection items related to transfer are broadly divided into the following two, and each is inspected individually.

1 Transfer information inspection a. Parity error check b. Framing error check c. Override error check d. 10th byte checksum check 2. Transfer reception completion signal check e. 10 consecutive reception completion signal reception checks (data omission/duplication check) ) f Check for no reception completion signal for 1Sec.

The inspection method will be described in detail below based on the flowchart of FIG. When a serial communication interrupt occurs, first a reception error (parity error, framing error, override error) is checked in step 51, and if a reception error is detected, an error flag is set (step 6). Error timer processing (step
66). If there is no reception error, 1
It is determined whether it is the first byte (step 52), and if it is the first byte, it is determined whether the address is its own (step 53). If the address is yours, read the data (step 54),
Then set the receive counter (step 55)
do. If it is determined in step 52 that it is not the first byte, it is determined whether the receive counter is set (step 56).
When it is set, it means that the first byte is not an error, but is between 2 and 10 bytes, so data is read (step 57). If the receive counter is not set, this means that the first byte is an error or the 11th byte and subsequent ones (data duplication), so the process moves to error timer processing (step 66). Furthermore,
Read the data in step 57, calculate the checksum of bytes 1 to 9 when the 10th byte is read, and if it is the same as the data of the 10th byte (step 60), write it to the input data area. 2
After setting the 9th byte of data (step 61), set the reception completion flag (step 61).
62). Then, in step 63, step 65
Determine whether the error flag set in step is cleared. If the flag is cleared, 1~
This means that all the data up to the 10th byte was not in error, that is, the data transfer was completed normally, so the error timer is cleared in step 64. On the other hand, if the error flag is set (an error occurred between the 2nd and 10th bytes, but the data is not read and the next data is read, and the checksum is OK), 10 This means that an error occurred in at least one of the bytes, so the error timer remains activated and only the error flag is cleared (step 67).

The error timer process (step 66) is executed last in all cases where a serial communication interrupt occurs, and as shown in Figure 6B,
When the error timer is "0", it is set to 1 second, and if the above-mentioned transfer information inspection items a to e continue for more than 1 second, the error timer is not cleared and times out, resulting in the error timer shown in Figure 6B. Moving on to processing, a serial communication error is displayed on the display 3.

In addition, in the case of item f in the above-mentioned section of the reception completion signal test for reverse rotation, the contents include cases in which 1 second has elapsed without any communication after the power was turned on, and cases in which communication has occurred several times. This is considered to be a case in which there is no communication even after 1 second has passed. In the former case, data transmission from the main processor starts 0.7 seconds after the power is turned on, so 1.7 seconds is set in the error timer when the power is turned on (processing in Figure 6A). On the other hand, for the latter case,
This can be handled by the error timer processing in step 66. Incidentally, if both times out, it means that serial communication has not been completed for one second, so a serial communication error is displayed on the display 3. The error check is continued even while the error display is being displayed, and the display contents are automatically returned to the normal state when the normal state is restored.

〔Effect of the invention〕

As is clear from the above, according to the text display device of the present invention, the information content is inspected and when an error occurs, a serial communication error text is displayed, and when the error inspection is continued and normality is recovered, the message is displayed. Since the normal state is restored, recovery processing from an abnormality can be performed quickly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
Fig. 2 is a memory map diagram showing the memory structure of the soft cassette, Fig. 3 is an explanatory diagram showing transfer data in the present invention, Figs. 4 a, b, and c are explanatory diagrams showing synchronization signals in the present invention, Fig. 5 and Figure 6 A,
B and C are flowcharts showing an example of processing in the present invention. Explanation of symbols, 1... Copying machine control unit, 2... Text display control unit, 3... Display unit, 4... CPU, 5... Input interface, 6... Soft cassette, 7... Text
RAM, 8... Character generator, 9... Shift register, 10... X-driver, 11... Decoder, 12... Y-driver, 13... Timing counter, 14... Output port.

Claims (1)

[Claims] 1. A text storage memory that stores a predetermined display text; and a signal processing unit that selects a display text from received information provided by an external control mechanism and reads the display text from the text storage memory. , a display device for displaying the display text read out by the signal processing section, and when the signal processing section detects an abnormality in the previous signal information, displays an abnormality on the display device, and also displays a normal state on the display device. A text display device characterized by causing the display to display normally in synchronization with restoration to a normal state.