JPH06119260A - Method and equipment for data communication - Google Patents

Abstract

PURPOSE:To provide the data communication system which can execute easily an extension and a removal with general knowledge, and can deal easily with all equipments extending from a small scale one to a large scale one, at a low cost and without using an exclusive equipment especially. CONSTITUTION:A request command requesting image information is transmitted to an information managing device 16 storing and managing the image information from a terminal equipment 10 provided with a communication function and a display function of the image information, and in accordance with the image information transmitted from the information managing device 16, an image is constituted and displayed, the information contained in the displayed image is selected arbitrarily in accordance with an operation, a selecting command is transmitted to the information managing device 16, and in accordance with the selecting command, a new image is constituted and displayed in accordance with the image information transmitted from the information managing device 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication method and a data communication device used for the method (hereinafter collectively referred to as "data communication system").

[0002]

2. Description of the Related Art A conventional data communication system is IEEE
802. There is a fixed connection data communication system that works with a host computer such as a LAN or Ethernet system conforming to "".

It comprises a dedicated cable, a dedicated connecting device, and a highly functional data display terminal to construct a large-scale data communication system.

[0004]

However, in the above-mentioned conventional data communication system, the host computer and the data display terminal are fixedly connected, and once installed, it is difficult to change such as expansion or relocation. Connection requires special expertise, which was an operational problem.

Further, in order to construct a conventional data communication system, expensive dedicated equipment is required, which results in an expensive system and a large-scale operation. Therefore, it takes time to start, operate and maintain the system. There is also a problem that it is not suitable for small-scale operation due to the high cost.

An object of the present invention is to solve the problems of the prior art as described above, and it is possible to easily add or relocate by general knowledge, and it is easy to handle from small scale to large scale. The purpose is to build a data communication system at low cost without using dedicated equipment.

[0007]

As a data communication method for achieving the above object, the present invention relates to an information management device for storing and managing image information from a terminal device having a communication function and a display function of image information. , Transmitting a request command for requesting image information, configuring and displaying a screen according to the image information sent from the information management device, and arbitrarily selecting information included in the displayed screen according to an operation. Then, the selection command is transmitted to the information management device, and a new screen is constructed and displayed according to the image information transmitted from the information management device in response to the selection command.

Further, as a data communication apparatus for achieving the above object, a display means for constructing and displaying a screen according to image information and information included in the screen displayed on the display means are selected according to an operation. Selection means for generating a selection command by
The information management device is connected via a communication line, and the communication device transmits the selection command and receives image information stored and managed by the information management device in response to the selection command.

[0009]

Therefore, the present invention is a system having a communication function and a display function of image information, and connecting a terminal device which does not store and manage image information by itself and an information management device which stores and manages image information through a communication line. By configuring, it is possible to easily add or relocate with general knowledge, it is easy to support from small scale to large scale, and it is possible to construct a data communication system at low cost without using special equipment. You can

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system configuration diagram of the present invention. In FIG. 1, a private branch exchange (hereinafter referred to as “PBX”) 12
Is for circuit switching. Further, the PBX 12 is a data telephone terminal (hereinafter referred to as "IDT") which is a terminal device.
10 and a normal extension telephone 13 are accommodated, and a call switching connection is established between them. Furthermore, PBX
12 is a terminal adapter (hereinafter referred to as "TA") 14
A host computer (hereinafter referred to as “HOST”) 16 which is an information management device is connected via the
And HOST16 can be freely connected.

The IDT 10 has a telephone function, a data communication function, and a display function during data communication. However, the IDT 10 itself does not manage the data,
The data managed by HOST16 is enjoyed. Therefore, the HOST 16 performs data communication with the IDT 10 and provides various service functions according to a request command from the IDT 10.

The communication paths between the IDT 10 and the PBX 12 and between the PBX 12 and the TA 14 are connected by a so-called 2B + D line interface 11 which is an ISDN basic interface.

A serial interface 15 which is an RS-232C interface conforming to the EIA standard is connected to the communication path between the TA 14 and the HOST 16.

2A and 2B are external views of the IDT 10 of the present invention. FIG. 2A is a front view, FIG. 2B is a left side view, FIG. 2C is a right side view, and FIG.

As shown in FIG. 2, the IDT 10 includes a main body 20.
0, handset 201, line connection rosette 217
And AC that supplies DC power from AC100V to this device
It is composed of an adapter 216, and also has a main body 20.
An extension line entry sheet 202, a speaker 203, an LCD display unit 204 as a display unit, an LCD display unit contrast adjustment knob 218, and various push buttons are mounted at 0.

FIG. 3 is a plan view of the IDT 10. In FIG. 3, free function button 205
Is a call activation button at the time of data communication, and codes (F1 to F5) corresponding to the button pressed at the time of call are included as transmission data in the user user information (UUI) of the call setting message. Sent to. Also,
When the free function button 205 is pressed after the data communication line is connected, the HOST is sent via the communication path.
It is transmitted to 16 and is provided with various services.

The correction button 206 is for correcting the number input by the ten-key pad 207, and the number displayed on the monitor of the area (b) of the LCD display unit 204 is erased one character from the right end each time the button is pressed to display a blank. Is something that
When the numeric keypad 207 is pressed after the data communication line is connected, the numeric input is displayed on the LCD display 204 as a monitor, and the # button or the free function button 20 is displayed.
After pressing any one of the buttons F1 to F5 out of 5, it is transmitted to the HOST 16 via the communication path and receives various services. On the other hand, the numeric keypad 207
When the handset 201 is off-hook or when the on-hook dial button 210 is pressed, it is used for dialing a telephone number for dial number input, and after the dial number is input, the dial / redial button 209 is depressed or after 6 seconds have elapsed. , Is transmitted by a call setup message and connects the telephone line.

In addition to the above-mentioned calling operation, the call / redial button 209 is also used as a redial function during the standby or off-hook mode when redialing to the last communication partner. It is a thing. The hold button 208 is used for temporarily holding a call. The transfer button 211 is used to transfer a call in progress. The hooking button 212 is used for PBX during a call.
12 is used when the partner is an analog line and requests the sending of a hooking pulse.

The disconnect button 215 is used to forcibly disconnect the call from the data communication line during data communication. The switch button 213 is used to switch to a circuit on the external terminal side by pressing a switch whose data communication line is connected to the LCD display unit 204. The volume UP and volume DOWN buttons 214 adjust the level of the ringing tone while waiting or ringing the ringing tone, while adjusting the handset receiving sound level while the handset 201 is off-hook, and on-hook dial button. This is used when adjusting the speaker volume while the monitor is being received by pressing 210.

FIG. 4 is an internal block diagram showing the overall structure of the IDT 10, and the line section 4 sectioned by the alternate long and short dash line in the figure.
00A and display unit 400B.

In the line section 400A as a communication means, the line interface circuit 401 is a digital line interface which has a so-called 2B + D channel which is an ISDN basic interface and which performs call control with the PBX 12 and connection switching of the B channel. .
The codec filter circuit 402 is connected to the line interface circuit 401, and encodes and decodes a voice signal and generates various tones. The call circuit 403 adjusts the gain and frequency characteristics of the voice signal and controls the switching of input / output destinations.

The data speed conversion circuit 404 is connected to the line interface circuit 401 and converts the bit format and the communication speed between the B channel and the RS-232C during data communication. Peripheral circuit 40
Reference numeral 5 is a circuit for MPU bus conversion, address decoder, and watchdog timer. The power supply voltage detection circuit 407 sends a reset signal when the power of the present apparatus is turned on. The reset signal is also sent when a drop in the power supply voltage is detected and when the watchdog timer times out.

The key scan circuit 406 is a matrix circuit of operation buttons mounted on the board surface of the present device, and detects a pressed operation button. MPU40
Reference numeral 8 is a microprocessor that controls the entire line unit 400A. From the line section 400A to the display section 400B,
It also has a function of serially transferring necessary information such as a pressed key code, communication attributes, and D channel information.

The ROM 409 is a memory circuit that stores the programs and data of the MPU 408. RAM41
Reference numeral 0 denotes a rewritable memory circuit that stores data used for calculation and control by the MPU 408 and whose memory content is volatilized when the power is cut off. The EEPROM 411 is a rewritable storage circuit that stores the contents registered and re-registered by this apparatus, and the stored contents do not volatilize even when the power is turned off.

The power supply circuit 412 is supplied with DC from an external AC adapter to receive DC voltage (+ 5V, -5V,-).
21 V) is output.

In the display section 400B, the MPU 421
Is a microprocessor that controls the entire display,
It also has a function of serially receiving necessary information such as a pressed key code, a communication attribute, and D channel information from the line section 400A. The communication data transmission / reception circuit 422 is
The serial communication data is transmitted and received via the data rate conversion circuit 404 and the interface of RS-232C, and is converted into parallel communication data. ROM424 is
It is a memory circuit that stores programs and data of the MPU 421. The RAM 423 is a rewritable memory circuit that stores data used for calculation and control by the MPU 421, and is a storage circuit in which stored contents are volatilized when power is cut off.

The address selection circuit (MPX) 425 is a buffer memory circuit (V
-RAM) 426, the storage address is MPU421
Or the LCD controller 429 is switched. The CG access circuit 427
According to the display character code output from the buffer memory circuit (V-RAM) 426, the character generator (C
G) It outputs a conversion code for accessing 428, and the character generator 428 outputs the dot information necessary for LCD display based on the code.

The LCD controller 429 is 320 × 2.
It is a control circuit for displaying a screen on a 40-dot LCD display 430, and also sends out the address timing to the MPX 425 and controls the LCD display timing.

FIG. 5 is a state transition diagram of the IDT 10 in this embodiment. In FIG. 5, when the power is turned on, power is turned on.
The R ON state 501 is established, the automatic call for data communication is continuously made, and the state automatically shifts to the data communication state 502. Also, in the data communication state 502, when the disconnection button 215 is pressed, the disconnection process is performed once, and then the POWER
Similar to the automatic call from the ON state 501, the automatic call of the data communication is performed, and the state transits to the data communication state 502 again. Furthermore, in the data communication state 502, the HOST
When 16 generates ER OFF, it transits to the standby state 503.

In the standby state 503, when any one of the function buttons 205 (Fn, where n is 1 to 5) is pressed, a data communication call is activated and the data communication state 502 is entered. . Further, when there is an incoming call in the standby state 503, an automatic response is made and the state transits to the data communication state 502.

When the numeric keypad 207 and the function button 205 are pressed in the data communication state 502, information corresponding to the pressing operation is HO'd via the communication path.
It is transmitted to ST16. Further, in the data communication state 502, when the handset 201 goes off-hook or when the on-hook dial button 210 is pressed, a transition is made to the standby state 504, and the ten-key pad 207 becomes a dialing button for calling the telephone function, and the dial number to be called is input. Is possible. In this waiting state 504, if there is a response from the other party, it transits to the data communication state 502 again and can be used for data communication.

FIG. 6 shows a power-on sequence in the data communication system of this embodiment. In FIG. 6, first, when the power to the IDT 10 is turned on 600, the POWR O
The N state is entered, and the IDT 10 is activated and initial settings are made. The IDT 10 transmits to the PBX 12 a call setup message (SETUP) 601 including the F0 code, which is an automatic call, in the user information, that is, the call information via the D channel, and the call setup acceptance message (CALL PROC from the PBX 12). ) 602 is received.

On the other hand, the PBX 12 sends a call setup message (SETUP) 603 to the TA 14. Then, the TA 14 receives it and sends an incoming call indication (CI) 604 to the HOST 16. Also, TA14 is PBX1
2, a Paging message (ALERT) 605 is transmitted to the PBX 12, and the PBX 12 transmits a Paging message (ALERT) 606 to the IDT 10. Furthermore, TA14 receives ER ON607 from HOST16 and PBX1
2 sends a response message (CONNECT) 608 to the PBX 12, and the PBX 12 sends a response message (CONNECT) to the IDT 10.
NECT) 609 is transmitted. Then, PBX12 is T
A14 has a response confirmation message (CONN ACK) 6
11 is transmitted. TA receiving CONN ACK 611
14 is a communication path (B channel) 6 to the HOST 16.
After confirming the connection establishment of 13, the DR 612 is transmitted. Further, the IDT 10 also DR6 after confirming the connection of the B channel 613.
10 is sent to the IDT internal display output. Where IDT
B channel communication path 61 between 10 and HOST16
3 is established.

The HOST 16 which has received the DR 612 receives the HOST 16 after the timing (T0) of 100 ms or more has elapsed.
LCD as initial data from the service software of
Send display data 614 through B channel 613,
The IDT 10 that has received it displays it on the LCD display unit 204. This initial data is a main menu as a so-called initial screen. As mentioned above, IDT10
Does not manage image information data by itself, it is necessary to receive main menu data from HOST16. Further, the IDT 10 determines whether there is an error in the received data, and if there is no error or if there is an error, the acknowledge text (ACK) or the reject text (NA).
K) 615 is transmitted via B channel 613.

HOST which has finished transmitting the LCD display data
16 sends ER OFF 616 to TA 14, and TA
14 is a disconnection message (DISC) 61 on the D channel
7 to PBX12, and PBX12 sends IDT1
Send disconnect message (DISC) 618 to 0. I
The DT 10 sends a release message (RELEASE) 619 to the PBX 12, and the PBX 12 sends a release message (RELEASE) 620 to the TA 14 to request the release.

PBX1 that received RELEASE619
2 sends a release completion message (REL COM
P) 621 is transmitted, and TA14 which has received RELEASE 620 transmits REL COMP 622 to PBX 12
To terminate the power-on sequence.

FIG. 7 shows an application service sequence in the data communication system of this embodiment. In FIG. 7, a desired application service to be enjoyed (hereinafter referred to as “APS”) is selected on the main menu displayed on the LCD display 204 of the IDT 10, and the function button 205 corresponding to the APS is selected.
By pressing (700) one of the buttons, Fn is included in the user user information of the call setup message in order to receive the provision of the APS corresponding to the pressed button (Fn; n = 1 to 5), It is transmitted to the PBX 12. After that, 601 to 613 in the power-on sequence of FIG.
A communication path on the B channel is established through the same procedure as. That is, the function button 205 is the desired AP.
It functions as a selection means for selecting S.

After the communication path is established, the display data 701 of the selected APS is transmitted to the IDT 10, and the display data is displayed on the LCD display device 204 (702). I
The DT 10 HOSTs the confirmation message (ACK) 703.
Send to 16.

Further, the key data 705 is changed to HOST1 by the necessary key input 704 for the displayed APS.
6 and corresponding new lower level AP
AP requesting S display data and responding to the request
S display data 706 is received from HOST16, LCD
The display 204 is displayed (707), and a confirmation message (ACK) 708 is transmitted to the HOST 16. This 70
By repeating the process from 4 to 708, the intended service can be received.

When the service provision is ended, when the function button Fn corresponding to the end is pressed (709), the key data information 710 of Fn is transmitted to the service software of the HOST16 via the B channel, and the initial screen data 711 is based on it. To the IDT 10. IDT 10 sends confirmation message 712 to HOST16
Send to. After that, the same cutting sequence 616 to 622 as the power-on sequence of FIG. 6 is performed.

After the disconnection, the initial screen data 711 is IDT.
10 remains on the LCD display 204, ending the APS sequence.

FIG. 8 shows a forced disconnection sequence in the data communication system of this embodiment. In FIG. 8, when forcibly disconnecting during APS reception when there is no line error or no response, press the disconnect key 215 (80
0) and a disconnection message (DISC) 801 is transmitted. The PBX 12 that has received it sends a disconnect message (DISC) 802 to the TA 14, and further releases a message (RELEASE) 804 to the IDT 10.
And release completion message (REL COMP) 8
05 is received. Host computer 16 is ER OF
The F14 sends the F806, the TA14 receives it, sends the release message (RELEASE) 807 to the PBX 12, receives the release complete message (REL COMP) 808, and completes the forced disconnection.

I received the REL COMP 805.
The DT 10 takes the timing T1 (T1 is 500 ms or more), and initializes the call setup message (SETUP) 80.
9 is transmitted, and after the power-on sequence and the same activation sequence, the normal service provision receivable state is set.

FIG. 9 shows an error resending sequence in the data communication system of this embodiment. In FIG. 9, LC
If there is an error in the D display data 901, 903, 905, the IDT 10 sends a negative message (NAK) 90.
2, 904 and 906 are transmitted to the service software of the HOST16, retransmitted, and an error display request is made. However, even if there is an error in the display data, the IDT 10 still displays it on the LCD display unit 204.

10A and 10B show the code conversion definition area of the IDT 10. In FIG. 10A, the characters used in the data communication with the HOST 16 are
The 1-byte character code is JIS8 unit code 1001, and the 2-byte character code is shift JIS code 10.
02,1003. Since the definition areas of both codes are different, even if they are mixed, there is no overlap in the codes, so it is possible to distinguish them.

To display the received display code in characters, CG
The code is converted into a code corresponding to the ROM address. First, the JIS8 unit code 1001 and the shift JIS codes 1002 and 1003 are converted into the JIS kanji code 1004.
After conversion into 1005, it is converted into the CGROM address input code 1006 shown in FIG.

FIG. 11 shows a code conversion flow by hardware. In FIG. 11, when the display data is received from the HOST 16 (step S1), the first data shown in FIG.
Depending on the code definition area of the byte, JIS8 unit code 1001 or shift JIS code 1002,100
It is determined whether it is 3 (step S2). JIS8 unit code consists of 1 byte, alphanumeric characters, half-width characters, A
It consists of NK characters. The shift JIS code is
It has a 2-byte structure and is a full-width Kanji code.

In the step S2, in the case of the JIS8 unit code 1001, the same code is continued twice, the received display data is converted into 2 bytes (step S3), and stored in the display buffer memory in the display order to be displayed on the LCD display (step S2). S4). Also, shift JIS code 100
In the case of 2,1003, 2 bytes are stored in the display buffer memory as they are in the order of display on the LCD display.

Next, the display data stored in the display buffer memory is read out in the order of display, input into the code conversion ROM (CCROM), converted into the address of the CGROM, and output (step S5). Next, CGRO
An address except the lower 4 bits is input to M, and character dot conversion processing corresponding to it is performed (step S
6) Under the control of the LCD controller, one character of 16 dots is displayed on the LCD (step S7).

FIG. 12 shows an outline flow of the code conversion ROM data creation of the IDT 10, and FIGS. 13 to 25 show a detailed flow of FIG.

In FIG. 12, first, if the first byte of the received data transmitted from the HOST 16 is a shift JIS 2-byte code (step S1).
1), JIS by "SJIS.BAS" processing routine
Code conversion to 2-byte code of Kanji (step S1
2) The code is converted into the ROM address data A by the "ROM.BAS" processing routine (step S13).
In addition, the judgment of the first byte of the received data is J
If the IS8 unit is a 1-byte code (step S14),
The code is converted into the ROM address data B by the "1BYTE.BAS" processing routine (step S15). Next, ROM address data A and ROM address data B
Are combined into one and organized as 16-bit ROM address data (step S16). Further, in order to write in the ROM, the 16-bit address is aligned with the 16-bit code conversion data and is output as the ROM writer write data (step S17).

13 to 17 show "SJIS.BA".
S is a detailed flow of the processing routine, "S" represents the shift JIS code, and "J" represents the JIS code. The flow of FIG. 14 is step S21 of the flow of FIG.
The processing routine of FIG.
Processing routines in steps S23 and S24 of FIG.
This is an ERO "processing routine.

18 to 21 show "ROM.BAS".
It is a detailed flow of a processing routine, and R represents a CGROM address. 19, 20 and 21 show the processing routine of steps S31, S32 and S33 in FIG.

Further, FIGS. 22 to 25 show "1BYT".
E. 23, 24 and 25 are the processing routines of steps S41, S42 and S43 of FIG.

In the above flow, the received data is CGROM based on the ROM address data created for code conversion.
The address input (excluding the lower 4 bits) is converted to the code.

Unlike the code conversion flow shown in FIG. 11, FIG. 26 is based on software instead of CCROM, that is, hardware. In FIG. 26, the process from the display data reception (step S51) to the storage in the display buffer memory (step S54) is the same as the process from step S1 to step S4 in FIG. 11, and the description thereof will be omitted.

Next, the data is read out from the display buffer memory in the order of display, and the JIS8 unit code or shift JI is used.
It is determined whether it is an S code (step S55), JIS
In the case of an 8-unit code, a process (operation 1) of converting to a CGROM address is performed (step S56). On the other hand,
In the case of the shift JIS code, first, the process (operation 2) of converting to the JIS kanji code is performed (step S5).
7) After that, processing for converting to a CGROM address (operation 3) is performed (step S58).

Further, the calculation result is used as the address input of the CGROM, and the steps S6 and S of FIG.
Similarly to step 7, character dot conversion processing (CGROM) corresponding to address input is performed (step S59),
LCD character display is performed (step S60).

As described above, even the software is CCROM.
Code conversion is possible with hardware that uses
In consideration of the amount of communication data and the communication speed, the code conversion by the hardware using the CCROM, which is faster than the code conversion speed, is adopted in this apparatus.

FIG. 27 is an LCD of the IDT 10 of this embodiment.
It is a display example, and is an APS related to the work of product design in a manufacturing plant or the like. In FIG. 27, the LCD has a specification of 20 digits and 13 lines in Chinese character display, the top line is a monitor display of a telephone system and a data communication system, and the central 10 line is a display of communication data. The manufacturing specification and other design work menus are shown. The lower two rows are areas for displaying variable function key data sent so as to correspond to the function keys F1 to F5. In this display example, menu selection key input or function keys F1 to F5
Click to expand to the next information and select and obtain the required information. In this display example, F1 to F5 have the functions of previous page, subsequent page, storing, printing and ending.

FIG. 28 shows a data format format used in this embodiment, in which a start bit st (1 bit),
It is serial data composed of data bits b1 to b8 (8 bits), a parity bit p (1 bit), and a stop bit sp (1 bit).

29 (a), (b) and (c) are text formats used in this embodiment, (a) is general text, (b) is ACK text, and (c) is NAK text. Is shown. General text is STX (S
A maximum of 250 bytes can be inserted between tart of text) and ETX (end of text), and a BCC (block check character code) operation value for block check is also added. ACK text is STX and E
A transmission control character of ACK is inserted between TX and a BCC calculation value is also added. NAK text is STX and E
NAK transmission control character and error code (E) between TX
R1, ER2), and BCC calculation value are also added.

The maximum number of characters displayed on one screen of the IDT 10 according to the received data is 11 lines × 40 columns = 440.
It is a character and its data length is 440 bytes. However, as described above, since the text length of the general text in FIG. 29A is 250 bytes at the maximum, when the HOST 16 is a general personal computer, the data to be displayed at one time excluding the transmission control character is 250
Considered to be part time. In addition, approximately half of the screen data can be transferred as one text, and the upper half or lower half of the screen including the line feed code can be rewritten.

Further, the ACK text and the NAK text in FIGS. 29B and 29C are HOST1 in terms of system operation.
The amount of data sent from 6 is large, and the IDT 10 side checks the received data for errors by comparing it with the BCC operation, and returns the resulting ACK text and NAK text to the host computer for error control of the transmission data. Management control is possible on the host computer side. Therefore, the IDT 10 does not manage the transmission data,
It functions as a simple input / output device.

Further, a BCC operation value is added to enable more detailed error control of transmission data. The BCC operation is a value obtained by performing an exclusive OR (XOR) from the STX code to the ETX of the text and is set in the BCC code area.

FIG. 30 shows key information and transmission characters used in this embodiment. In FIG. 30,
(A) shows an operation key and transmission data corresponding to the operation. For example, F0 _{H of the} transmission key data is ID
This is a code for requesting menu activation when POWER ON of T10. (B) shows a transmission control character and its content. Further, (c) shows a display control character and its contents.

A specific use example of this embodiment will be described below.

1. LCD sent from HOST16
For the menu screen shown in FIG. 27 displayed on the display,
For example, when a manufacturing specification of 102 is selected by key input, display data of necessary information regarding the manufacturing specification is displayed as HOS.
It is transmitted from T16. Such data communication between the HOST 16 and the IDT 10 uses one B channel of the ISDN and therefore the other B channel,
Since it is possible to make a call with the customer, it is possible to discuss the product specifications with the customer while operating the keys.
Of course, it is possible to make a meeting regarding inventory search and management operations by selecting by key operation.

2. By performing key operation on the telephone number of the person who is going to make a call or the person who is making a call, it is possible to display or search the necessary information (for example, the profile of the person) about the person. Therefore, by providing the function of transmitting the outgoing and incoming numbers from the PBX 12 to the HOST 16 in advance, the outline of the other party can be displayed on the LCD before the call connection.
It is possible to display on the display and consider the correspondence in advance according to the display.

3. By selecting the menu on the display screen, the work of ordering and delivering goods can be performed while looking at the screen. Further, even when the other party is absent, it is possible to pick up necessary information regarding the work and newly store it in the HOST 16.

That is, the user of this data communication system can prepare a huge amount of data at hand, and the HOST1
By calling the necessary information from the data stored in 6 and shared by a plurality of users, it is possible to use all the information relating to the product design.

In the system configuration of the above embodiment, the host device to which the IDT 10 is connected is the PBX 12, but the system configuration is not limited to this and other system configurations may be used. The system configurations of other examples will be shown below.

1. The host to which the IDT 10 is connected is the network (I
SDN). In this case, information stored in an information management device such as a database connected to the network can be called up via the network.

2. The communication partner with IDT10 is HOST1
In addition to 6, a general personal computer or another device such as a printer may be used as long as it has a data communication function. In this case, for example, local data can be read from the personal computer, and the HOS
It is also possible to print the data from T with a printer.

Further, as the communication method of the IDT 10,
The method described below is also possible without being limited to the above embodiment.

1. A method of identifying the call origination by the function keys F1 to F5 from the IDT 10 by including it in the user user information (UUI) of the SETUP message.

2. A method of making a call by using a dial number (special number) corresponding to F1 to F5 for identification.

3. Received data is not only code transmission,
A method to display the input data in pixel information.

5. Asynchronous 9600 as in the above embodiment
Not a bps data communication, but a data communication method using a synchronization method or another transmission speed.

6. A communication method according to another format such as an HDLC procedure, instead of the text format and the data format format of the embodiment.

[0082]

According to the present invention, a terminal device having a communication function and a display function of image information, which does not store and manage image information by itself, and an information management device which stores and manages image information are connected by a communication line. The system configuration for connection has an effect that the terminal device can be easily added or relocated without requiring specialized knowledge.

Further, by changing the capacity of the exchange (PBX), it is possible to cope with a small to large scale communication system, and there is an effect that a data communication system can be freely constructed at a relatively low cost.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a data communication device for realizing a data communication method according to the present invention.

FIG. 2 is an external view of a terminal device (IDT) in FIG.

3 is a board view of the IDT shown in FIG. 2. FIG.

FIG. 4 is a block diagram showing the overall configuration of an IDT.

FIG. 5 is a state transition diagram of the IDT.

FIG. 6 is a diagram of a power-on sequence in the data communication system shown in FIG.

7 is a diagram of an application service sequence in the data communication system shown in FIG.

8 is a diagram of a forced disconnection sequence in the data communication system shown in FIG.

9 is a diagram of an error retransmission sequence in the data communication system shown in FIG.

FIG. 10 is a diagram showing a definition area for IDT code conversion.

FIG. 11 is a diagram showing a code conversion flow by hardware.

FIG. 12 is a diagram showing an outline flow of creating code conversion ROM data.

FIG. 13 is a diagram showing a detailed flow of code conversion ROM data creation in FIG. 12;

FIG. 14 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

FIG. 15 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

16 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

FIG. 17 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

FIG. 18 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

FIG. 19 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

FIG. 20 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

21 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

22 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

23 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

FIG. 24 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

FIG. 25 is a diagram showing a detailed flow of creating code conversion ROM data in FIG. 12;

FIG. 26 is a diagram showing a code conversion flow by software.

FIG. 27 is a diagram showing an LCD display example in the IDT.

FIG. 28 is a diagram showing a data format format used in the data communication system shown in FIG. 1.

29 is a diagram of a text format used in the data communication system shown in FIG. 1. FIG.

30 is a diagram of key information and transmission characters used in the data communication system shown in FIG.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Yokota 94 Kuniyama City, Koriyama City, Fukushima Prefecture Nitto Telecom Technology Co., Ltd.

Claims (4)

[Claims] 1. A terminal device having a communication function and an image information display function transmits a request command for requesting image information to an information management device that stores and manages image information, and the information management device transmits the request command. A screen is configured and displayed according to the displayed image information, information included in the displayed screen is arbitrarily selected according to an operation, a selection command is transmitted to the information management device, and the selection command is received. A data communication method for forming and displaying a new screen according to the image information transmitted from the information management device. 2. The terminal device automatically transmits calling information to the information management device when the power is turned on, and initializing according to the image information transmitted from the information management device according to the calling information. The data communication method according to claim 1, wherein a screen is configured and displayed. 3. Display means for configuring and displaying a screen according to image information, and selecting means for selecting information contained in the screen displayed on the display means according to an operation to generate a selection command. A data communication device comprising: communication means for transmitting the selection command to an information management device connected via a communication line, and receiving image information stored and managed by the information management device in response to the selection command. . 4. The calling information is automatically transmitted to the information management device when the power is turned on, and an initial screen is configured according to the image information transmitted from the information management device according to the calling information. The data communication device according to claim 3, wherein