JPH0693736B2 - Abnormal data output prevention method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multiplex communication device connected to a fax machine, and more particularly to preventing output of abnormal data thereof.

(Prior Art) Conventionally, when this type of abnormal data output prevention method is not installed, one line erroneously outputs data that has already been output, or another line outputs data that has already been output. There is a possibility that the line corresponding part of the above may have received it by mistake.

In this way, if there is something wrong with the device, it is said that the buffer will be cleared when the buffer becomes used by the common control unit so that data will not be output to the facsimile terminal. It was processing.

(Problems to be Solved by the Invention) In the above-described conventional abnormal data output prevention method, the reception buffer for receiving the image signal of the facsimile is installed in the common control unit and usually has a certain size. For this reason, if the buffer is cleared after each use, the time required for clearing reduces the processing speed of the entire apparatus.

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

(Means for Solving the Problem) An abnormal data output prevention method according to the present invention is a multiplex communication apparatus including a reception buffer, a common control section, and a plurality of line corresponding sections.

The reception buffer can write the RTC signal showing the used contents at the beginning of the area corresponding to the line, and receives the facsimile MH / MR signal and stores the received data in the area corresponding to the line. It is a thing.

The common control unit controls the input of the MH / MR signal from the reception buffer so that the signal can be transmitted to each terminal of the facsimile.

The plurality of line corresponding units are for inputting received data under the control of the common control unit, communicating with each terminal of the facsimile under the instruction of the common control unit, and transmitting the data.

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

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

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

In the multiplex communication device 10 connected to the fax machines 31 to 33,
An internal reception buffer 12 is provided for the MH or MR facsimile signal from a host device (not shown) corresponding to the line.
To receive.

The common control unit 11 transmits the received data to the line corresponding units 21 to 23 and controls the line corresponding units 21 to 23 to control the facsimile 31 to.
Communicate with 33 terminals.

The line corresponding units 21 to 23 receive data from the common control unit 11,
It communicates with the terminals of facsimiles 31 to 33 according to an instruction from the common control unit 11.

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

When the n-channel data is sent from the host device, the common control unit 11 receives the n-channel reception buffer area # n−1,
Data is sequentially stored in # n-2, and the line interface 23 of the n channel is controlled to start transmitting the data to the terminal of facsimile 33. When the line interface unit 23 finishes outputting the data of # n-1, the common control unit 11 writes the RTC of the MH signal and the MR signal at the head of the buffer area for # n-1. This process sequentially
Perform on the reception buffer area of all channels.

As a result, even if there is something wrong with the device and the same channel or another channel again sends the output buffer contents to the fax terminal, the RTC will appear at the beginning of the data. To be
The receiving terminal ignores the data after RTC and does not receive it. Therefore, the actual output of data to the terminal is prevented.

(Effect of the Invention) As described above, according to the present invention, the processing of the device is compared with the case of clearing the entire buffer by rewriting the head of the used reception buffer area with the reception of data to the RTC signal. It is possible to prevent the same data from being erroneously transmitted again or output to another terminal without lowering the speed, and it is possible to ensure the confidentiality of the transmitted data.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an abnormal data output prevention system according to the present invention. FIG. 2 is an explanatory diagram showing an example of the contents of the reception buffer shown in FIG. 10 …… Multiplexing device 11 …… Common control unit 12 …… Reception buffer 21-23 …… Line interface unit 31-33 …… Facsimile

Claims (1)

[Claims] 1. An RTC signal representing used contents can be written at the head of an area corresponding to a line, a MH / MR signal of facsimile is received, and the received data is respectively sent to an area corresponding to the line. A receive buffer for storing,
A common control unit for inputting the MH / MR signal from the reception buffer and controlling it so that it can be sent to each terminal of the facsimile, and inputting the reception data under the control of the common control unit. An abnormal data output preventing method for a multiplex communication device, comprising: a plurality of line corresponding units for communicating with each terminal of the facsimile and transmitting data according to an instruction from the common control unit.