JPH02105776A - System for preventing output of abnormal data - Google Patents

Abstract

PURPOSE:To prevent output of abnormal data without lowering the processing speed of a device by rewriting the leading edge of a used receiving buffer area produced upon receiving data to an RTC signal. CONSTITUTION:When data of a channel (n) are sent from a host device, a common controlling section 11 causes the data to be successively stored in the receiving buffer area for the channel (n) of a receiving buffer 12 and starts to transmit the data to facsimile terminal equipment 33 by controlling a line corresponding section 23 for the channel (n). When the section 23 completely outputs the data, the controlling section 11 writes an RTC in MH and NR signals in the leading edge section of the buffer area and successively performs such operations to receiving buffer areas of all channels. Therefore, output of abnormal data can be prevented without lowering the processing speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multiplex communication device connected to a facsimile, and more particularly to preventing the output of abnormal data.

(Prior art) Conventionally, if this type of abnormal data output prevention method has not been installed, one line may erroneously output data that has already been output again, or another line may output data that has already been output to another line. In the line support department.

It is also possible that the message was received by mistake.

In this way, in order to prevent data from being output to the facsimile terminal if there is any abnormality in the device, clear the buffer when it is used up in the common control section. The process described above was carried out.

(Problems to be Solved by the Invention) As mentioned above, in the conventional abnormal data output prevention method, the reception buffer for receiving facsimile image signals is installed in the common control unit, and usually has a certain size. Therefore, if the buffer is cleared every time it is used, the disadvantage is that the time required for clearing reduces the processing speed of the entire device.

An object of the present invention is to eliminate the above-mentioned drawbacks by writing an RTC signal at the head of the buffer instead of clearing the used data buffer, and to provide an abnormal data output prevention method configured so as not to reduce the processing speed. Our goal is to provide the following.

(Means for Solving the Problems) The abnormal data output prevention method according to the present invention is provided in a multiplex communication device including a reception buffer, a common control section, and a plurality of line correspondence sections.

The reception buffer can write R and TC signals indicating used contents at the beginning of the area corresponding to the line, and receives facsimile MH/MR signals and stores the received data in the area corresponding to the line. It is for.

The common side i section inputs the MH/MR signal from the reception buffer and controls it so that it can be sent to each facsimile terminal.

The plurality of line corresponding sections input received data under the control of the common control section, communicate with each facsimile terminal according to instructions from the common control section, and send out the data.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the abnormal data output prevention method according to the present invention.

In FIG. 1, 11 is a common control unit, 12 is a reception buffer, 21 to 23 are first, second, and nth line corresponding units, respectively, and 31 to 33 are facsimile units, respectively.
10 is a multiplex communication device.

Multiplex communication device 10 connected to facsimiles 31 to 33
Then, an internal reception buffer 12 receives a MW or MR facsimile signal from a host device (not shown) in correspondence with the line.

The common control section 11 transfers the received data to the line correspondence sections 21 to 21.
23, and controls the line corresponding units 21-23 to communicate with the facsimile terminals 31-33.

The line support units 21 to 23 receive data from the common control unit 11, and send facsimiles 31 to 23 according to instructions from the common control unit 11.
Communicate with 33 terminals.

FIG. 2 is an explanatory diagram showing the contents of the reception buffer connected to the common control unit 11.

When n-channel data is sent from the host device, the common control unit 11 stores the n-channel reception buffer area #n-.
1*#n-2, and controls the n-channel line correspondence section 23 to begin transmitting the data to the facsimile 33 terminal. When the line correspondence section 23 finishes outputting the data of #n-1, the common control section 11 writes the RTC with the MH multiplied signal M-signal at the beginning of the buffer area for #n-1. This process is sequentially performed on the reception buffer areas of all channels.

As a result, even if there is some abnormality in the device and the contents of the buffer that has already been output are sent to the facsimile terminal again on the same channel or on another channel, the RTC is added to the beginning of the data. Therefore, the receiving terminal ignores the data after the RTC and does not receive it.

Therefore, data is prevented from actually being output to the terminal.

(Effects of the Invention) As explained above, the present invention rewrites the beginning of the used reception buffer area with an RTC signal as data is received, which improves the processing of the device compared to the case where the entire buffer is cleared. This has the effect that it is possible to prevent the same data from being erroneously transmitted again or output to another terminal without reducing the speed, and the confidentiality of the transmitted data can be ensured.

[Brief explanation of the drawing]

The first example is a block diagram showing an embodiment of the abnormal data output prevention method according to the present invention. FIG. 2 is an explanatory diagram showing an example of the contents of the reception buffer shown in FIG. 1. 0...Multiplex communication device l...Common control unit 2...Reception buffer l~23...Line support unit 1~33...Facsimile

Claims (1)

[Claims] An RTC signal indicating the used content can be written at the beginning of the area corresponding to the line, and the facsimile MH/M
a receiving buffer for receiving the R signal and storing the received data in areas corresponding to the lines; and a receiving buffer for inputting the MH/MR signal from the receiving buffer and transmitting it to each facsimile terminal. a common control unit for controlling the facsimile, and a plurality of units for inputting the received data under the control of the common control unit, communicating with each terminal of the facsimile according to instructions from the common control unit, and transmitting the data. What is claimed is: 1. A method for preventing abnormal data output of a multiplex communication device, characterized in that the system is configured to include a line support section.