JPH03280655A - Error data output preventing system - Google Patents

Abstract

PURPOSE:To prevent an output from a facsimile equipment when a used data is sent in error to the facsimile equipment by selecting a 2-way buffer receiving a facsimile picture signal inversely/noninversely every time one communication is finished. CONSTITUTION:A multiplex communication equipment with a facsimile equipment consists of a common control section 1 and n-set of line control sections 3-6 sending a data given from the common control section 1 to facsimile terminal equipments 8-11 by its command. Then a data inversion circuit is provided between the common control section 1 and the line control sections 3-6 in place of clearing a data reception buffer whose operation is finished and inversion/ noninversion is switched alternately when one operation of the data reception buffer is finished. Thus, if a used data should be given in error to the line control sections 3-6, the output of the data to the facsimile terminal equipments is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for preventing the output of abnormal data in a multiplex communication device with a facsimile.

Conventionally, this type of abnormal data output prevention method has been proposed in the past, when there is some kind of abnormality in the device and a certain line control unit mistakenly retransmits the data that has already been output, or when the used data on another line is In order to prevent abnormal data from being output to the facsimile terminal even when a fax is sent, the common control unit clears the buffer when it is used up.

Problems to be Solved by the Invention However, since the facsimile image signal buffer usually has a certain size, the conventional abnormal data output prevention method described above does not take much time to clear the buffer. This had the disadvantage of slowing down the overall processing speed.

The present invention has been made in view of the above-mentioned conventional situation,
Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks inherent in the conventional technology, and to ensure that even if used data is accidentally transferred to a certain line Maf section, the data can be output to a facsimile terminal. It is an object of the present invention to provide a novel method for preventing abnormal data output, which makes it possible to prevent abnormal data output from occurring.

Means for Solving the Problems In order to achieve the above object, the abnormal data output prevention method according to the present invention has a line-compatible data reception buffer,
A common control unit that transmits facsimile MH/MR signals received from a higher level to a line control unit via its data reception buffer, controls the line control unit to output data to a facsimile terminal, and a common control unit that transmits data from this common control unit. In a multiplex communication device with a facsimile machine, which is composed of n line control units that transmit received data to a facsimile terminal according to its instructions, instead of clearing the data reception buffer that has been used, the common control unit and the line The present invention is characterized in that a data inversion circuit is provided between the control sections, and the data reception buffer is alternately switched between inversion and non-inversion every time one use of the data reception buffer is completed.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and is a block diagram of a multiplex communication device with a facsimile, and FIG. 2 is a detailed diagram of an inverting circuit provided between a line-compatible data reception buffer and a line control section.

In FIG. 1, a multiplex communication device with a facsimile receives a MH or MR facsimile signal from a higher level into a data receiving buffer 2 which is divided for each line based on addresses.
a common control unit 1 which receives the data from the facsimile terminals 8 to 11, passes the data to the line control units 3 to 6, and controls the line control units 3 to 6 to communicate with the facsimile terminals 8 to 11; Line control unit 3 to communicate with 8 to 11
It consists of 6.

FIG. 2 is a block configuration diagram of a data inversion circuit, and this data inversion circuit is installed between the common control unit 1 or the data reception buffer and line control units 3 to 6, or between the line control units 3 to 6.
The selection signal 1 from the common control unit 1
4, a non-inverting bidirectional buffer 1 exclusively selected by
2 and an inverted bidirectional buffer 13.

When data for n lines is sent from the upper level, the common control unit 1 stores the data in the data reception buffer 2 for n lines. At this time, the non-inverting bidirectional buffer 12 is selected as the initial state of the data inverting circuit. then n
The control section of the line is instructed to transmit data to the facsimile terminal, and when the communication is completed and the data reception buffer 2 is used, the selection is switched to the inverted bidirectional buffer 13.

This process of alternately switching the selection of the buffer to be used every time one communication is completed is also performed when the data reception buffers of all lines are used. As a result, even if the control unit of the same line reads the data once and sends it to the facsimile terminal by the control unit of the same line by mistake, or if the data is read by the control unit of another line and sent to the facsimile terminal. Since the data is inverted, a decoding error is detected on the facsimile terminal side, and nothing is output to the facsimile terminal.As described in detail, according to the present invention, the facsimile image signal By switching the bidirectional buffer connected to the buffer between inverting and non-inverting each time one communication is completed, data that has been used by mistake can be sent to the facsimile terminal without reducing the processing speed of the device. You can prevent output to the terminal even if the

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the abnormal data output prevention method according to the present invention, and FIG. 2 is a detailed diagram of an inverting circuit. 1... Common control section, 2... Image signal buffer section, 3.
4.5.6...Line control section, 7 river system bus 8.9
．． 10.11...Facsimile terminal, 12...Non-inverting bidirectional buffer, 13...Inverting bidirectional buffer, 1
4. Non-inverting bidirectional buffer/'inverting bidirectional buffer (-sofa selection signal

Claims (1)

[Claims] It has a data reception buffer compatible with the line, and transmits the facsimile MH/MR signal received from the upper level to the line control unit via the data reception buffer, and controls the line control unit to output data to the facsimile terminal. In a multiplex communication device with a facsimile consisting of a common control unit and n line control units that transmit data passed from the common control unit to a facsimile terminal according to instructions thereof, the data reception buffer that has been used is cleared. Instead, a data inverting circuit is provided between the common control section and the line control section, and the data inverting mode is alternately switched between inverting and non-inverting each time the data receiving buffer is used once. Abnormal data output prevention method.