JPS62104246A - Document data transmission method - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency by setting the data quantity sent by one transmission to a proper value in response to the line state so as to reduce the number of times of retransmission. CONSTITUTION:A transmission flag F and a reduction transmission counter T are set to 0 ahead the data transmission and the transmission data number is set to (n). Then the transmission data is loaded from a floppy disc device FDD 27 by using a floppy disc controller FDC 307. Then n-set of transmission data are sent by using a communication controller 303 via an NCU MODEM 304 and a telephone line 205. Whether or not the presence of retransmission request (presence of error) is decided from the incoming caller after the transmission and when no retransmission request exists (if no error), whether or not the document data to be sent remains is decided, and when existing, the transmission flag F is decided and when F=0, the data transmission in the unit of n-set is repeated. When the retransmission request exists, the data No and the data number for retransmission are set, the transmission flag F is set to 1 to move the mode to the retransmission.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a document data communication method for transmitting and receiving sentence-1 data between word processors using a public communication line.

[Background of the invention]

Japanese teletex devices are designed to send and receive document data such as Japanese between word processors, but the amount of data to be sent in one transmission operation is fixed, so there is no possibility of errors in the sent or received data. If there is, resend the incorrect data.

After that, it was sending a fixed amount of data again.

Therefore, depending on the line conditions, there may be cases where retransmission is required each time, resulting in a drop in transmission efficiency. [Purpose of the Invention] The quality of a communication line is determined by the amount of traffic at that time, in addition to the inherent characteristics of the line. 1 due to disturbances, disturbances, etc.
Quality may vary greatly depending on the time of day.

An object of the present invention is to improve transmission efficiency in situations where the quality of communication lines changes as described above.

[Summary of the invention]

The object of the present invention is to reduce the number of retransmissions and improve transmission efficiency by setting the amount of data to be transmitted in one transmission operation to an optimal value depending on the conditions of one line.

In other words, if the quality of one communication line deteriorates and an error occurs in transmitted and received data, the amount of data to be transmitted in each subsequent transmission operation is automatically reduced to reduce the number of retransmissions, thereby increasing transmission efficiency. It is something that improves.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

A teletex device using an embodiment of the present invention is as follows.

As shown in FIG. 2, the main body 20 is equipped with a temporary storage section and a control section. Keyboard 21 which is an input section. It is composed of a word processor consisting of a printer 22 as a printing section, a CRT monitor 23 as a display section, and a communication device 1ii26 having a control section and a temporary storage section for one communication function. These main bodies 20. Printer 22. Keyboard 21.
As will be described later, the CRT monitor 23 and the communication device 26 are connected via cables to exchange control signals or information signals.

In addition, in Fig. 2, 24 and 27 are floppy disks 5i.
lt<hereinafter referred to as F'DI). ).

Inside the main body 20, a main body control section 25 is installed, which is indicated by a broken line in the control circuit shown in the block diagram of FIG.

This main body control unit 25 includes a host CPU 251 consisting of a central processing unit (hereinafter referred to as CPU), a non-volatile memory (
Hereinafter, it will be referred to as ROM. ), a boot ROM 252 containing a program to be executed when a stain source is turned on, and a memory (hereinafter referred to as FLAM) that can be read and written at any time for storing programs and information for executing functions as a word processor. memory 253
．． A screen display pattern is generated according to commands from the host CPU 251 and displayed on the CRT monitor 2 via the cable 203.
7 which controls the F'DD 24 according to commands from the host CPU 251;
0tsupi disk controller (hereinafter referred to as 1'DC)
255. A printer controller 256 that sends signals and print signals to control the printer 22 according to commands from the host CPU 251 to the printer 22 via the gold cable 201, receives status signals of the printer 22 from the printer 22, and sends them to the host CPU 251. The keyboard 21 is controlled via the cable 202 according to instructions from the host CPU 251, and input signals from the keyboard 21 are sent to the host CPU.
251, the interface conversion unit 258 for exchanging data between the communication device 26 and the main body control unit 25, and the host CP
U251. Poot ROM252. Program memory 253, CRT control device 254. FDC255, printer controller 256. key human controller 25
7 and an inner S wiring path d connecting the interface conversion section 258. Furthermore, all these control circuits and FDD24. A voltage source circuit 260 for supplying DC voltage to the CRT monitor 23 and keyboard 21 is also accommodated.

Next, the communication device d26 will be explained.

In the communication device 26, a communication control section 28, which is indicated by a broken line in the control circuit shown in the block diagram of FIG. 1, is installed.

This communication control unit 28 includes a CPU 301 for communication, a ROM, a boot module 302 having a program to be executed when an ATM is turned on, and a RAM for storing programs and information for executing communication functions through a communication line 205.
A communication program memory 3061 consisting of a memory control unit 3051 that controls the 1g program memory 306; a communication controller 303 that controls one line of data conversion for communicating through the telephone line 205 according to instructions from the communication CPU 301; and 4M from the controller 303. modulates and demodulates digital signals into analog signals.

F'i) according to instructions from the NCU modem 3041 communication CPU 301 that monitors the dialing and status of the telephone line 205
Fi) C307 that controls D27 and the communication C
PU301. Boot 1%0M302. Communication controller 303. It is constituted by an internal wiring path e connecting the memory control unit 305 and the F'DC 307. Furthermore 1. A power supply circuit 360 that supplies DC voltage to all these control circuits and the FI) D27 is also accommodated.

The main system # section 25 and the communication control section 28 are connected by a wiring path 204. The communication program memory 306 is configured to be accessible from both the host C1-'0251 and the communication CPU 301 through the memory control unit 305.
Control is carried out through the specified area of 6. Since the main body control section 25 and the communication control section 28 are operated by separate power supplies, each of them can execute their individual functions even if the other side is not powered on.

Here, the FDDs 24 and 27 drive a 70-tube disk as a magnetic storage medium, and record information on the 70-tube disk and read information from the floppy disk. Approximately on the front side of the main body 20 and the communication device 26, openings for attaching and detaching disks for the h'DDs 24 and 27 related to the temporary storage section are provided.

It should be noted that 10,000 of the 70 disks housed in the FDD 24 are recorded with programs for realizing the functions of a word processor, and the other is recorded with document data created by the word processor. Further, a floppy disk housed in the FDD 27 stores a program for controlling communication, and also temporarily records transmitted/received document data and communication results.

Next, the overall operation of this teletex device will be explained. That is, in the r4 configuration as described above, the power supply 260
is input, the word processor reads 7'-tROM
According to the 252 program.

The program memory 2 stores a program to operate as a word processor having the flow shown in Fig. 3, which is stored on a floppy disk set in the FDD 24.
53, and then the program memory 2.
It starts operating as a word processor according to the program transferred to step 53.

On the other hand, the 0 communication device 26 similarly operates as a communication control device according to the program of the PUT OM 302 and has the flow shown in FIG. After that, the communication function is executed according to the program transferred to the program memory 306.

The operation flow when the device functions as a word processor will be explained with reference to FIG. 3f. 1 of the main body control section 25! When the power supply 260 is turned on, the host CPU 251 displays a work menu on the CRT monitor 23 in process 3001 and requests selection of a work to be executed. When the input process is selected in the work selection input process 3002, the process moves from process 3003 to process 3004, and the input process program is executed. Document data being processed manually.

According to the input processing program in the program memory 253, the CR'r control device 254 converts it into an image pattern, converts it into a video signal, and sends it to the Crt and T monitor 2.
3 to form a display image on the tube surface.

Processing instructions accompanying the input of the document data are performed according to data and function instructions manually input from the keyboard 21. The instruction to finish data entry is displayed on the keyboard 21.
When this is input, the host CPU 251 detects this, executes end processing, and returns to step 3001 to prepare for the next processing.

When an edit process is input in the work selection input process 3002, the process moves from process 3005 to process 3006, and the edit process program is executed. In this editing process 3006, the screen is rewritten according to the function keys input from the keyboard 21.

Information on work instructions, progress, etc. for other processes as well.

This is what is displayed on the CRT monitor 23.

When print processing is input, processes 3007 to 3008 are performed.
and run the print processing program.

In this print processing 3008, the code data of the designated document recorded on the 70 disk stored in the F'DD 24 is converted into image data according to the mD key input from the keyboard 21, and the code data of the designated document is converted into image data. The document image 11! is sent to the printer 22 via the printer 22, and the document image 11! It is to be printed in its entirety.

When the document data transfer process is input, the process moves from process 3009 to process 3010, and the document data transfer process program is executed. In this transfer process 3010, if the power supply 360 is turned on to one communication device 26 and a response is received from the communication device 26, the data is stored in the F'DD 24 according to the function key input from the keyboard 21. The interface converter 258 converts the specified document data recorded on the floppy disk into the interface converter 258. is set in a designated area of the communication program memory 306 via the memory control unit 305,
Subsequent processing is handed over to the communication CPU 301 of the communication device 26. The communication CPU 301 records the received document data on a floppy disk housed in the FDD 27 via the FDC 307 for temporary storage. And if.

The document data received from the outside by the communication device 26 is
1. If it appears that the document data is recorded on the floppy disk accommodated in the FDD 27, by specifying it from the keyboard 21, the communication CPU 301 sets the specified document data in the specified area of the communication program memory 306, The host CPU 251 accesses the area via the memory control unit 305 and the interface conversion unit 258 and receives the document data.

When the auxiliary function is input, process 3011 to process 3012
and execute the auxiliary function processing program. The auxiliary function is a general term for a function that aggregates functions such as copying document data in a 70 disk to another floppy disk.

Next, the operation of the communication device 26 will be explained with reference to FIG.

When the power supply 360 of the communication control unit 28 is turned on, the communication CP
In step 4100, the U 301 loads a communication control program from the floppy disk in the FDD 27 according to the program in the boot ROM 302, and proceeds to data processing according to the program. First, in process 4200, the telephone line 205
It is determined whether there is a reception request through 4300, and if so, the process moves to process 4300 and reception processing is performed. Reception processing 430
0, the NCU modem 3041 communication controller 303. The received document data is recorded on the floppy disk stored in the F'DD 27 through the FDD 307. If there is no reception request, the process moves to process 4400 to determine whether there is document data to be transmitted, and if there is, the process moves to process 4500 to perform the transmission process. In the transmission process 4500, the document data recorded on the floppy disk stored in the FDD 27 is transferred to the communication controller 303°NC.
U modem 304. It is transmitted through telephone line 205.

In the transmission processing 4300 and the reception processing 4500, the communication results after transmission and reception are also recorded on a 70-tup disk accommodated in the FDD 27.

If there is no document data to be transmitted, it is determined in process 4600 whether or not the main body is energized, and if it is not energized, the process returns to process 4200 to determine whether there is a reception request.

If the main body is energized, the process moves to process 4700 to determine whether there is a transfer instruction from the main body, and if there is no instruction, the process returns to process 4200 to determine whether the reception request is rejected. If there is an instruction, the process moves to data transfer processing 4800 with the main body. In the data transfer process 4800 with the main body, according to instructions from the main body, the transmitted document data was received and recorded on the 70 disk stored in the FDD 27, and the received document data recorded on the floppy disk was transferred to the main body. It also transfers status information indicating the status of the communication device 26 and communication results recorded on the floppy disk.

Next, transmission and reception operations regarding retransmission will be explained in detail with reference to FIGS. 5 to 7.

Figure 5 shows the flow when the number of transmitted data is n, and an abnormality occurs at the (n-3)th transmitted data.
The specific operation will be explained with reference to FIG.

FIG. 6 shows an example of the flow of data transmission processing 4500 of the communication program within the communication device 26.

Prior to data transmission, first, in process 4501, the transmission 7 lag F and short transmission counter T are set to 0.

Proceeding to process 4502, the number of transmission data is set to n.

Next, in process 4503, the transmission data is sent to the FDC 307! D
Load from FDD27. Then, in process 4504, the communication controller 303 transmits the n pieces of transmission data.
CU modem 304. Transmit via telephone line 205. After transmission, it is determined in process 4505 whether there is a retransmission request from the called party (presence or absence of an error), and if there is no retransmission request (if there is no error), the process moves to process 4506 to determine whether there is still document data to be transmitted. Determine.

If it remains, the transmission flag F is determined in process 4507, and F
If it is 2O, the process returns to step 4503 and data transmission is repeated in units of n pieces. If there is a retransmission request in process 4505, the process moves to process 4508 to set the number of data to be retransmitted (from n-3 in the first transmission example in FIG. 5), and sets the transmission flag F in process 4509. Set to 1 and process 4
503 IC returns to retransmit the retransmitted data (second transmission example in FIG. 5).

After retransmission, if there is no retransmission request from the called side in the judgment process of process 4505 (if there is no error), process 4506.4507
．． After 4510, the process moves to 4511 and the transmission flag is set to 2.
In addition, in step 4512, the number of data to be transmitted at one time is set to n-3 from the previous retransmission result, and in step 450
Go back to 3.

Thereafter, the number of data to be transmitted is reduced to 3iIA and shortened transmission is performed (the third transmission example in FIG. 5). From now on, send data as n
- Every time abbreviated transmission is performed in units of 3 items, a retransmission request is determined in process 4505, and if there is no retransmission request, processes 4506 and 4507
, 4510, and proceeds to process 4513, where the abbreviated transmission counter T is counted up, and then, in process 4514, the number of abbreviated transmissions is determined, and until the number of abbreviated transmissions reaches a certain arbitrary value m, the process returns to process 4503, and the abbreviated transmission is repeated. . When the number of abbreviated transmissions exceeds m, the process returns from process 4514 to process 4501, sets the transmission flag F and abbreviated transmission counter T to 0, sets the number of transmission data to n again, and executes transmission in units of n1m (th Example of the m+3rd transmission in Figure 5).

Note that if a retransmission request occurs during abbreviated transmission, the retransmission result is changed to an abbreviated transmission with an even smaller number of transmitted data (row x), and the number of transmitted data is thereafter reduced until there is no longer a retransmission request.

In addition, as shown in FIG. 7, in the receiving process 4300, statement 1 "data is received in process 4301, and an error in the received data is determined in process 4302. If there is no error, a reception good signal is sent in process 4303. is sent to the calling party, and processing 430
In step 4, it is determined whether the process is finished or not, and if the process is not finished, the process returns to step 4301. If there is an error in error determination process 4302, process 43
05, an error report (to what extent the reception was successful, etc.) is sent to the calling side, requesting retransmission, and the process returns to process 4301.

〔Effect of the invention〕

As described above, according to the present invention, the amount of data to be transmitted in one transmission operation is automatically changed depending on the status of one communication line, so that transmission efficiency can be increased.

[Brief explanation of drawings]

Figure 1 is an overall block diagram of the teletex device. FIG. 2 is an overall external view, FIG. 3 is a 70-chart of the operation of the word processor, FIG. 4 is an operation flowchart of the communication device, and FIG. 5 is a timing diagram of the SK data. 20... Main body, 24... Floppy disk installation fit
(FDD). 26... Communication device, 27... Floppy disk device (PDJ)), 25... Main body control unit, 251... Host CPU, 253... Program memory, 255...
・・Floppy disk controller (FDC), 28・
...Communication control unit, 301...Communication DPU, 303.
...Communication controller, 304...NCU modem, 3
05...-Memory control unit, 306...Communication program memo! , I, 307... Floppy disk controller (FDC), 205... Telephone line.

Claims (1)

[Claims] 1. A document comprising a document creation device for creating, printing, and registering document data, and a communication device connected between a communication line and the document creation device and responsible for transmitting and receiving document data. In the document data transmission method of the transmitting device, the communication device first transmits the maximum amount of data that can be transmitted in one transmission operation, has the called party report how much data was successfully received, and based on the result, the communication device transmits the maximum amount of data that can be transmitted in one transmission operation. A method for transmitting document data, characterized in that the amount of data to be transmitted is set. 2. Transmit the amount of data set in claim 1, and if it cannot be received normally, have the called party report the result again, set the amount of data, and continue this process until it can be sent and received normally. A method for transmitting document data, characterized in that the amount of data is determined by repeating operations. 3. In claim 1 or 2, if the set amount of data can be successfully transmitted and received more than a certain number of times, the device again transmits the maximum amount of data that can be transmitted in one transmission operation. A document data transmission method characterized by: