JPS61205070A - Facsimile communication method - Google Patents

Abstract

PURPOSE:To perform communication between memories with no mistake by informing the vacant capacity of a receiver to a transmitter by the receiver itself prior to reception of picture data and transferring the picture data to the memory of the receiver by the transmitter only when the picture data can be stored in said vacant memory capacity. CONSTITUTION:When a call is set up, well-known handshake is carried out between a transmitter and a receiver. Based on this handshake, it is decided by a non-standard device signal NSF sent from the receiver whether or not the receiver has picture data equal to that of the transmitter. At the same time, the number of pages of the memory is decided by a CPU 1 set at the transmitter side. In other words, the receiver puts the capacity of its memory 4 into the signal NSF in the form of the information on the page number (P2). Then the receiver adds the page number (P2) of the memory 4 into the signal NSF to be sent to the transmitter through the handshake carried out after a call is set up.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of communication between facsimile transceivers equipped with a memory for storing image data of a read document.

In a conventional facsimile machine equipped with a memory for storing image data, the transmitter reads the image data of the original and stores it in the memory, then extracts the image data from the memory and transmits it, and the receiver After storing the received image data in its own memory, the image data can be taken out from the memory and printed out on recording paper. C.C.I.
According to T, 30 in G3 of TT, the image data encoded for transmission has a fill added to each line.
Although a minimum transmission time for a line is determined, the above-mentioned fill can be omitted when communicating between the memories, which has the advantage of shortening the transmission time.

Problems to be Solved by the Invention When communicating between memories as described above, the amount of image data sent from the transmitter is too large to fit into the memory of the receiver and overflows, resulting in communication failure. There is. It is an object of the present invention to solve such problems and to enable communication between memories to be performed without error.

Means for Solving the Problems In the present invention, when communicating image data, the receiver notifies the transmitter of the free space of its own memory prior to receiving the image data,
The transmitter determines whether or not the image data to be transmitted can be stored in the free space, and transfers the image data to the memory of the receiver only if it is possible.

According to the present invention, in the handshake procedure after call setup, the transmitter can know the free memory capacity of the receiver,
Since it is possible to determine whether all the image data can be transmitted, if it is not possible, it is possible to interrupt communication before transmitting the image data or switch to normal transmission.

Embodiment FIG. 2 shows a facsimile machine for carrying out the present invention, in which (1) is a CPU, (2) is a ROM that stores an operation program for this facsimile 7 mm, and (3) is a device that controls the progress of the program. R and A M that store various data generated along with the
, (4) is an image data memory consisting of RAM.

(5) is an operation panel for performing various manual operations such as transmission commands, and (6) is a modem. (7) is a reading device that reads the image data of the original to be sent and converts it into a binary electrical signal indicating white or black; (8) is a recording device that prints out the received image data on recording paper using a printer. It is. (91 (10') (11) and (12) are all interfaces. The memory area of the image data memory (4) is equally divided into a plurality of pages for each predetermined number of bytes,
Addresses and page numbers within a page are accessed sequentially.

Regarding the communication method using the above facsimile device, Part 1 f
This will be explained next using the atfb1 diagram.

In the facsimile machine on the sending side, that is, in the transmitter, the CPU (1
1, the original is set on the reading device (1) (step ■
), turns on the main power of the transmitter (Step ■), inputs the dialed number of the destination from the operation panel (5) or a telephone (not shown) (Step ■), and transmits from the above panel (5). Waiting for command input (step ■), the reading device (7) is instructed to start reading the original document. The image data indicating white or black read by the reading device (7) is converted from serial to parallel by the interface (11), further converted into a run length code by a counter circuit (not shown), and stored in the image data memory (4). be done. Image data is stored in the memo (January 4) in order from the first page of the memory (step ■), and each time the amount of image data stored reaches the number of bytes equivalent to one page, RAM f is stored.
Page count value (Pl) in a predetermined area within 31
is incremented by 1 (step ■). It is assumed that this count value (Pl) normally always indicates 0, or is reset to 0 by the transmission command in step (2).

The above step ■■ is repeated until there is no more image data to be stored, and when the CPLHI) detects a reading end signal from the reading device (7) (step ■), it communicates with the other receiver based on the dial number. Perform call settings (step ■). When the call is established, the above T,
A known handshake according to 30 is performed, during which it is determined whether the receiver has a similar image data memory as the transmitter, based on a non-standard equipment signal (NSF) transmitted from the receiver. In addition, the number of pages in the memory is detected by the CPU (11) on the transmitter side (step ■).In other words, in the above signal (NSF), the receiver detects the capacity of the image data memory of itself as the number of pages. (P2) shall be included as information.The CPU of the transmitter (11 is the number of pages (P2) obtained from the receiver) and the number of oil mud pages (P1) stored in the RAM of the own machine (31). ) and compare the step [phase]), and if P 2 - P 1 ≧ 0, then (
Step 0) Set the transmitter to memory-to-memory communication mode and send a non-standard device setting signal (NSS) to the receiver.
'), sets a flag indicating that it is the inter-memory communication mode (step @). After the handshake is completed, the transmitter's CPU (1) sequentially takes in the image data from both data memos (January 4) and converts the run-length code into an M, H or MR code, and the converted image data is After being further converted from parallel to serial at the interface (10), it is modulated by the modem (6) and sent out on the line.

Every time one page of image data is taken out from the image data memory (4) (step @) CPU (1) decrements the number of pages (Pl) in 31 by 1 (step ■), P1=0 At the point in time (step 0), the image data transmission is completed, a post-procedural handshake is performed (step [phase]), the line is disconnected, and the transmission operation is completed. In the image data transmission in the above step [phase], as described above, the image data is transmitted without adding a fill to each line. Also, in step 0, P2
- If PI<O, the transmitter is set to normal communication mode and the flag in the standard equipment setting signal (NSS) is not set (step [phase]) and the normal communication mode is set to normal communication mode with the above fill added to each line. Image data transmission is performed (step O [phase] ■).

To explain the operation of the receiver, during the handshake after the call is established (step [phase]), the receiver includes its own image data memory (4) in the non-standard equipment signal (NSF) sent to the transmitter. ) is added as information (step [phase]). Next, the receiver CPU (11
is a non-standard equipment setting signal (NSS) sent from the transmitter.
) to detect the flag indicating the memory-to-memory transmission mode described above (step [phase]), set the device to memory-to-memory communication mode (step [phase]), and start receiving image data (step [phase]). . The image data sent over the line in step [phase] is demodulated by the modem (6), converted from serial to parallel by the interface (10), and then temporarily supplied to the RAM (31), and Then, the image data in the RAM (31) is sequentially taken in by the CPU (1), converted from the MH code or MR code to a run-length code, and stored in the image data memory (4).

CPU (1+ detects the procedure end signal (EOP) from the data sent from the transmitter (
step [phase]), the message confirmation signal (MC
F) and disconnect the line (step [phase]). After the line is disconnected, both data in the image data memory (4) are taken out, and the CPU (11) or the counter circuit
The run length code is converted into data indicating white or black, which is further supplied to the recording device (8) via the interface (12) and printed out on recording paper (
step [phase]).

If the transmitter does not request normal communication in step [step], the receiver is set to normal communication mode (step [phase]), and shifts to the normal reception operation of printing out the image data at the same time as receiving it (step [phase]). Step [phase] 0 [phase]
[phase]).

Note that the above example shows a case where the image data memory of the transmitter/receiver is divided into a plurality of pages each having the same number of bytes. If the number of bytes is different, the communication procedure shown in the example above cannot be used simply, but in this case, the image data memory should be used without being divided into multiple pages, or Communication is possible by transmitting the byte capacity of the data memory and comparing both numbers of bytes in step [phase].

Furthermore, in the above example, the receiver receives the video data immediately after the line is disconnected.
Since we are planning to start printing in the evening, the image data memory (4) of the receiver will be empty by the time communication starts, and therefore the number of pages (P2) to be sent in step [phase] will be empty. is set to the total number of pages held in the image data memory (4) of the receiver.

If the printout of step [phase] is to be performed after a predetermined time has elapsed since the line was disconnected, then the memory (4
) can store image data from different destinations at the same time, but in this case the above steps [phase]
4, the number of pages to be sent out (P2) cannot be constant, but must be the total number of empty pages in the memory (4). Therefore, in this case, the CPU (1) counts the empty pages in the image data memory (4) between steps [phase] and calculates the total number of pages (P2) in the step [phase]. ), and furthermore, in step [phase], image data is stored in the page of the window. Incidentally, for this purpose, it is necessary that the page numbers of the image data memory (4) can be randomly accessed. Since such a method of storing data in a memory is already known, detailed steps will be omitted.

Effects of the Invention According to the present invention, it is possible to reliably transfer image data to the memory of a receiver, so there is no need to re-transmit data due to a transfer failure, and there is an advantage that line usage charges can be reduced. be.

[Brief explanation of drawings]

FIG. 1(a) is a flowchart showing the operating procedure of the transmitter, and FIG. 1(b) is a flowchart showing the operating procedure of the receiver, and FIG. 2 is a block diagram of a facsimile machine implementing the present invention.

Claims (1)

[Claims] A file equipped with a memory that stores image data. A communication method between Kushimiri transmitters and receivers, The receiver should read the above memo before receiving the image data. Amount of new image data that can be stored in is reported to the transmitter, and the transmitter Amount of image data to be sent The image will be displayed only when it is judged that it can be sent. transfer data to receiver memory Characteristic facsimile communication method.