JPS6370660A - Data communication equipment - Google Patents

Abstract

PURPOSE:To know the communication function of the opposite communication destination and to make a data communication efficiently by interchanging a communication procedure with the transmission destination once if the characteristics of the opposite terminal are unknown when a data communication equipment transmits or receives data. CONSTITUTION:A CPU 27 retrieves terminal characteristic information in opposite terminal information stored in a hard disk device 50 or floppy disk device 51. The characteristic information when stored is read out and stored on a program memory 23 temporarily. When not, a call is made through a line 40 and a communication command is sent out to the opposite transmission device. A communication start response is received from the opposite party and opposite terminal characteristic information set in the response is read out. It is checked whether or not sent data needs to be converted according to the opposite terminal characteristics to release the line when the conversion is required or to carry o the communication procedure and send data when not. When the line is released, the data conversion is performed according to the opposite terminal characteristics and a call is sent through the line 40, which is connected to the opposite terminal, thereby sending the converted data.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a data communication device that transmits and receives data.

(Prior Art) In recent years, devices of this type, such as facsimile machines, have been provided with shorter transmission times and with various communication modes.

However, as the number of communication modes increases, the facsimile communication procedure for determining the communication mode between devices becomes complicated, and it takes time to determine the communication mode. The disadvantage is that the communication time becomes long.

(Objective) The object of the present invention is to eliminate the drawbacks of the above-mentioned conventional example, and to make it possible to know the communication function of the communicating party, thereby shortening the time required for communication.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a perspective view showing the above embodiment.

The reader 10 reads a predetermined document and outputs an electrical signal.

The facsimile body 20 includes a reader/printer interface 21, an image compression unit (hereinafter referred to as rIcUJ) 22, and a program memory (hereinafter referred to as rIcUJ).
PMEMJ) 23, bit move unit (hereinafter referred to as rBMUJ) 24, and image memory (hereinafter referred to as rBMUJ) 23,
IMEM) 25, and video RAM (rV
(referred to as RAMJ) 26, and a central processing unit (rCPU)
J) 27 and communication interface 2
8, a bus 29, and a communication control unit (hereinafter referred to as "CCU") 30.

The ICU 22 compresses or expands data,
Two-dimensional compression (high compression) is used to increase the coding rate. The PMEM 23 has an OS program and an application program memory area for controlling the input/output devices provided around the facsimile main body 20 and each unit in the facsimile main body, and also has an application program memory area for exchanging character code image data. It has a font memory area.

In addition, PMEM23 is a memory management unit (
It also has a work area as a buffer for transmission data to be transmitted from the hard disk via the CCU 3O and stored from the CCU 3O to the hard disk. Note that the above buffer is a disk,
This is for adjusting the speed of lines, etc.

The BMU 24 performs image editing (image processing) on the CRT 60, and enlarges, reduces, rotates, and
It is used for moving or cutting.

IMEM 25 has 4 bytes and can store images from the reader, images edited by BMU 24, and I
It stores data expanded by the CU 22, word processing code data based on key code characters, mixed data, or data obtained by converting character codes into images. Here, in the case of mixed data, an identification code is attached to the image block and character block and stored. The IMEM 25 is used to match the speed of the reader 10 and the line 40 by temporarily storing predetermined data, and the VRAM 2
Reference numeral 6 stores image data to be displayed on the CRT 60 as a bitmap code.

Furthermore, a hard disk device 50 and a floppy disk device 51 are provided as external storage devices. Although these devices are non-volatile memories, backup memories may be used as the non-volatile memories.

The keyboard 61 is used to input characters and the like and to specify a position on the CRT 60 using a cursor.

62 is a pointing device. In addition, a printer 70 is provided.

The mixed mode terminal of this embodiment can communicate image data, character data, and data in which image and character data are mixed.

First, in the case of transmission, the original to be sent is divided into multiple blocks such as an image area and a character area (image data or character data may be divided into multiple blocks), and each block is given location information and size information. Information etc. are added in the form of a code, and packets are exchanged between receiving devices in units of blocks.

The miss mode terminal of this embodiment exchanges procedures to determine the transmission mode with the other terminal before transmitting and receiving document data. In this procedure exchange, information regarding terminal characteristics and data format attributes that can be handled is exchanged.

When transmitting with the above configuration, the data is converted into a data format that can be received by the other party's terminal before being transmitted.

In this case, when the terminal characteristics of the sending party are unknown, once communication is started and communication procedures are exchanged with the sending party, the characteristics of the sending party are known, and data can be exchanged according to the characteristics of the sending party. Then, send the data to the destination.

This allows communication time to be reduced compared to when data is converted and transmitted in real time.

Then, after trying communication once, the characteristic information regarding the sending party's terminal is stored in memory along with the sending party's identification information (specifically, the sending party's telephone number, etc.) for identifying the sending party. From communication, transmission is performed based on the information in this memory.

FIG. 3(a) shows a command for requesting the start of communication.

In FIG. 3(a), a indicates the type of command, b indicates the overall length of the command, C indicates the terminal characteristics of the wood end bundle, and d indicates the data format that the own terminal can handle.

FIG. 3(b) shows a response to the communication start request.

In FIG. 3(b), e is the type of response, f is the overall length of the response, C is the terminal characteristic of the other terminal, and d is the data format that the other terminal can handle.

FIG. 4 is a flowchart showing the control operation of the CPU 27 of this embodiment.

Step S1 in FIG. In S2, it is determined whether terminal characteristic information (information on the type and communication function of the other party's terminal) of the other party to which data is to be sent is stored in the other party's terminal information stored in the hard disk device 50 or floppy disk device 51. If the terminal characteristic information of the transmission destination is stored, the terminal characteristic information is read out and temporarily stored in the PMEM 23, and the process proceeds to step S8. If the terminal characteristic information of the corresponding transmission destination is not stored, the process proceeds to step S3. move on. This search for destination terminal information is based on the destination identification information (for example, the destination's phone number).
Using this as an index, it is determined whether or not terminal characteristic information corresponding to the transmission destination information entered manually from the keyboard 61 is registered.

If it is determined in step S2 that the terminal characteristics of the destination party are not registered, a call is made to the line 40 using the telephone number of the destination party, and when the line is connected, a communication start request command is sent out. At this time, own terminal characteristic information is set in the communication start request command and transmitted.

Next, step S4. In S5, a communication start response, which is a response signal from the other party to the communication start request command, is received, and the other party terminal characteristic information set in this communication start response is read. Then, in step S6, it is determined whether or not it is necessary to convert the data to be sent to the transmission destination in accordance with the characteristics of the destination terminal, and if conversion is necessary, the communication is stopped and the process proceeds to step S7, where the line is opened and the data If there is no need for conversion, the process advances to step S12 to continue the communication procedure and transmit data.

When the line is released in step S7, the process advances to step S8.
In step S8, data is converted in accordance with the characteristics of the other party's terminal. As for data conversion, for example, if the destination terminal is a 04 facsimile device, all character code data is converted to image data, and if the destination terminal is a telex device, the character code block in the transmission data is left as is, and for the image data block, If the telex of the other party can receive the data as a private character, the image block is further divided into smaller pieces and sent as dot data of the private character.

When the data conversion in step S8 is thus completed, a call is made to the line 40 in step S9 to connect the line to the transmission destination, communication procedures are exchanged in step SIO, and converted data is transmitted in step Sll.

The communication procedure described above is based on the communication procedure recommended by CCITT.

Furthermore, characteristic information of the other party's terminal with which communication has been performed is stored in the hard disk device 50 or the floppy disk device 51.

As described above, in this embodiment, if the characteristics of the other party's terminal are unknown,
Once communication procedures are exchanged with the transmission partner, information on the characteristics of the other party's terminal is received, data is converted according to the terminal characteristics information, and then the converted data is sent, so data communication can be performed efficiently. , the time required for communication can be shortened.

〔effect〕

As explained above, according to the present invention, the communication function of the communication partner can be known, and data communication can be performed efficiently.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of this embodiment, Fig. 2 is a perspective view of a mixed mode terminal of this embodiment, and Figs. 3 (a) and (b) show the communication procedure of this embodiment. FIG. 4, which is a diagram showing the structure of commands and responses, is a flowchart of the CPU 27 of this embodiment. 10 is the reader, 20 is the facsimile body, 23 is the PME
M, 27 is a CPU, 30 is a CCU, 40 is a line, 50 is a hard disk device, 51 is a floppy disk device,
60 is a CRT, 61 is a keyboard, 62 is a pointing device, and 70 is a printer.

Claims (1)

[Scope of Claims] Storage means for storing communication function information of a communication partner; designation means for specifying the communication partner; and storage means for information on the communication partner designated by the designation means. 1. A data communication device comprising: means for determining whether or not there is registration; and means for exchanging communication information with the designated communication destination when the determination result by the determining means is that there is no registration.