JP3293143B2 - Data transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system in which a plurality of data terminal devices are mutually connected for communication and sequentially transmit data to each data terminal device in a relay format.

[0002]

2. Description of the Related Art Conventionally, in a large store such as a supermarket, a distributed file system composed of a plurality of terminals has been used. In this distributed file system, data transmission is performed using a broadcasting function. The broadcasting function is that when the file data of a certain terminal is changed, the changed contents are transmitted from the terminal (called a starting terminal) to each of the other terminals existing in the system at substantially the same timing as the change. Is to maintain the integrity of the system.

[0003]

However, in the conventional broadcasting function, since the starting terminal transmits the changed contents to each terminal, the processing time becomes longer in proportion to the number of terminals constituting the system. There were drawbacks. To reduce processing time,
It is also conceivable to transmit information from one terminal to an adjacent terminal in a relay manner. However, this method has a drawback that if an error occurs at the time of transmitting information, error information cannot be transmitted to the starting terminal. .

[0004] An object of the present invention is to solve the problem that when data to be transmitted is sequentially transmitted to a plurality of data terminal devices in a relay format, data transmission to the next terminal becomes impossible in any of the data terminal devices. Another object is to ensure that data can be transmitted to each subsequent data terminal device.

[0005]

According to the present invention, a plurality of data terminal devices are connected to each other, and data to be transmitted is transmitted to each of the data terminal devices in accordance with transmission order information in which the data transmission order to each of the data terminal devices is stored. A data transmission system for sequentially transmitting data via a device, wherein each of the data terminal devices determines whether or not a next destination data terminal device according to the transmission order can transmit, and Search means for searching for a device, transmission means for transmitting the transmission target data to the data terminal apparatus determined to be transmittable by the search means, and recording for recording the data terminal apparatus determined to be untransmittable by the search means Means,
It is determined whether the data terminal device at the next destination according to the transmission order is the start data terminal device that first transmitted the transmission target data among the data terminal devices, and is the start data terminal device. And a termination processing request unit for transmitting a termination processing request and a recording result of the recording unit to the data terminal device, wherein the termination processing is started in the data terminal device at the start in response to the termination processing request. Further, different processing is performed depending on whether or not the transmission result is recorded in the recording result of the recording means.

[0006]

DESCRIPTION OF THE FUNCTIONAL BLOCK DIAGRAM FIG. 1 is a functional block diagram showing a connection state storage means 1 for storing a connection order of a plurality of data processing devices, and a first transmission means 2 for transmitting data in accordance with the connection order. The second data transmission means 3 transmits data to a predetermined next data processing device when transmission to another data processing device is impossible.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. This embodiment is applied to an electronic cash register. In this case, the distributed file system has an electronic cash register as a terminal and is constituted by a plurality of electronic cash registers.

FIG. 2 is a block diagram showing a circuit configuration of the electronic cash register. In FIG. 1, a key input unit 11 is a numeric keypad 1 for inputting numerical data such as “0” to “9”.
1a and function keys 11b for specifying various functions
And "Z (payment)", "X (check)", "OFF", "REG (registration)", "P
Mode switch 11c for specifying each mode such as "(setting)"
And When a key is operated by the key input unit 11, a key input signal corresponding to the key operation is input to the CPU 13 via the input control unit 12.

The CPU 13 executes various processes such as numeral processing, registration processing, and error processing in accordance with the input key input signal. These various processes are executed based on a control program stored in the ROM 14 in advance. CPU1
3 has a RAM in addition to the input controller 12 and the ROM 14.
15, display drive unit 17, print control unit 19, drawer 20,
And a transmission control unit 21 are connected.

The RAM 15 is for writing / reading data under the control of the CPU 13. The RAM 15 has an error information table 15a, a terminal connection table 15b, its own id No.
A register 15c, a transmission buffer 15d, and another storage unit 15e are provided.

The display unit 16 is constituted by, for example, a CRT display device, and displays a set amount, a deposit amount, and the like based on display data output from the CPU 13 via the display driving unit 17. The print unit 18 issues a receipt, a journal, an error report, and the like based on print data output from the CPU 13 via the print control unit 19. The drawer 20 stores various cash and is opened under the control of the CPU 13. The transmission control unit 21 controls data transmission to other electronic cash registers in the system.

FIG. 3 is a diagram showing a configuration of transmission data transmitted from the transmission side to the reception side when performing broadcasting. In this case, the identification number id of the transmitting terminal is set to “1”, and the identification number i of the receiving terminal is set to “1”.
d is “2”. The transmission data includes a start terminal (start terminal) id No., a file No., a record No., setting data, and an error information table. The error information table includes records for the number of terminals constituting the system. Each record is provided with an area for storing the execution result of the broadcasting corresponding to the terminal id No.

Next, the operation of the above embodiment will be described. FIGS. 4 and 5 are diagrams illustrating a broadcasting operation in a system including five terminals (terminals 1 to 5). FIG. 4 is a diagram showing an operation when the broadcasting is completed normally. FIG. 5 is a diagram showing an operation when the broadcasting in the terminal 3 is NG. FIG. 6 is a diagram showing an example of the terminal connection table 15b.

First, an example shown in FIG. 4 will be described. In this case, the broadcasting is performed in the order based on the terminal connection table 15b in FIG. That is, the start terminal is terminal 1, and terminal 1 transmits transmission data to terminal 2. As a result, the terminal 2 executes the data receiving process shown in FIG.

In step A 1, transmission data transmitted from the transmitting terminal is received under the control of the transmission control unit 21. In a succeeding step A2, the transmission data is written into the transmission buffer 15d. In step A3, the processing result of the broadcasting is written in the error information table of the transmission data. That is, only when the result of the reception processing in step A1 or the result of the transmission determination processing in step A8 is an error, the “NG” code is written in the error information table of the transmission data corresponding to the terminal in which the error occurred. In step A4, the terminal connection table 15b is searched, and the next terminal, that is, terminal 3 is designated. In the following step A5, it is determined whether the id No. of the next terminal is equal to the id No. of the start terminal, that is, whether data has been transmitted to all terminals. When the data is transmitted to all terminals, YES is determined in step A5, and the process proceeds to step A6, where an end processing request is transmitted to the start terminal.

In this case, since the next terminal 3 is not a start terminal, the determination at step A5 is NO, and the process proceeds to step A7. In step A7, a data transmission request is made to terminal 3. In the following step A8, it is determined whether transmission to the next terminal 3 is possible. When transmission is possible, the process proceeds to step A9, and when transmission is not possible, the process returns to step A3.

If transmission is possible, the process proceeds from step A8 to step A9. In step A9, the transmission data is transmitted to the next terminal 3, and the processing in FIG. 7 ends.

Thereafter, the transmission data is transmitted from the terminal 3 to the terminal 4 and the transmission data is transmitted from the terminal 4 to the terminal 5 in the same manner as described above. Then, when the data receiving process is executed in the terminal 5, YES is determined in the step A5 and the process proceeds to the step A6, and the transmission data is transmitted from the terminal 5 to the terminal 1 which is the start terminal together with the end processing request signal. You. As a result, the terminal 1 executes the end processing shown in FIG.

At step B1, the termination processing request signal and the transmission data are received. At step B2, the error information table of the transmission data is searched. Subsequent step B3
Then, it is determined whether or not there is an “NG” code in the error information table. If YES in step B3, the process proceeds to step B4, and if NO, the process in FIG. 8 ends. In this case, since the broadcasting was completed successfully,
The “NG” code is not stored, and it is determined as NO, and the processing in FIG. 8 ends.

Next, an example shown in FIG. 5 will be described. As in the example of FIG. 4, the starting terminal for broadcasting is terminal 1. Then, the terminal 1 transmits the transmission data to the terminal 2, and the terminal 2 executes the data reception processing as described above.

In step A1, the transmission data is received, and the flow advances to step A2 to write the transmission data in the transmission buffer 15d. In step A3, the processing result of the broadcasting is written in the error information table of the transmission data. In this case, nothing is written because the processing result is normal. In step A4, the terminal connection table 15b is searched to specify the next terminal 3. In step A5, the terminal's idNo. Is the start terminal's idN.
It is determined whether it is equal to o. In this case, since the next terminal 3 is not the start terminal, step A5
Is determined to be NO, and the process proceeds to step A7. Step A7
, A data transmission request is made to the next terminal 3. In the following step A8, it is determined whether transmission to the next terminal 3 is possible. In this case, as shown in FIG. 5, when transmission to the next terminal 3 is impossible, an error occurs in the next terminal 3 and the process returns to step A3. In step A3, the "NG" code is written in the error information table of the transmission data corresponding to the terminal 3 in which the error has occurred.

In the next step A4, the terminal connection table 1
5b is searched and the next terminal 4 is designated. Step A
At 5, it is determined whether the terminal idNo. Is equal to the start terminal idNo. in this case,
Since the next terminal 4 is not a start terminal, it is determined NO in step A5 and the process proceeds to step A7. In step A7, a data transmission request is made to terminal 4. In the following step A8, it is determined whether transmission to the next terminal 4 is possible.

In this case, since transmission to the next terminal 4 is possible, the process proceeds from step A8 to step A9. In step A9, the transmission data is transmitted to the next terminal 4, and the processing in FIG. 7 ends.

Thereafter, transmission data is transmitted from terminal 4 to terminal 5 in the same manner as described above. Then, when the data receiving process is executed in the terminal 5, “YES” is determined in the step A5 and the process proceeds to the step A6, and the transmission data is transmitted to the terminal 1 which is the start terminal together with the end processing request signal. As described above, the terminal 1 performs an end process.

In this case, transmission NG to terminal 3
As a result, the "NG" code is written in the error information table. Accordingly, YES is determined in step B3, and the process proceeds to step B4. In step B4, an error report indicating the error of the terminal 3 is issued as shown in FIG. 5, and the processing in FIG. 8 is terminated.

[0026]

According to the present invention, data terminal devices capable of transmitting can be searched for in accordance with the transmission order and data to be transmitted can be transmitted sequentially, and the data terminal devices determined to be untransmittable are recorded, and If the next data terminal device according to the above is the start data terminal device, the terminal device transmits an end processing request and a recording result to the data terminal device, and the start data terminal device performs the end process in response to the end processing request. Once activated, different processing can be performed depending on whether or not the transmission result is recorded in the recording result of the recording means, and it is possible to easily identify the presence or absence of a data terminal device whose transmission target data has not been received, and The data terminal device automatically sends a termination processing request only when the next destination data terminal device is the start data terminal device without any special settings. It can be sent to.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of an electronic cash register.

FIG. 3 is a diagram illustrating a configuration of transmission data.

FIG. 4 is a diagram illustrating an operation of broadcasting.

FIG. 5 is a diagram illustrating an operation of broadcasting.

FIG. 6 is a diagram illustrating an example of a terminal connection table.

FIG. 7 is a flowchart illustrating an operation of a data reception process.

FIG. 8 is a flowchart illustrating an operation of a termination process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Connection state storage means 2 ... 1st transmission means 3 ... 2nd transmission means 11 ... Key input part 12 ... Input control part 13 ... CPU 14 ... ROM 15 ... RAM 16 ... Display part 17 ... Display control part 18 ... Printing unit 19 ... Print control unit 20 ... Drawer 21 ... Transmission control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G06F 13/00 G06F 17/60 G07G 1/14

Claims (1)

(57) [Claims] 1. A data transmission apparatus comprising: a plurality of data terminal apparatuses connected to each other, and data to be transmitted sequentially transmitted through the respective data terminal apparatuses according to transmission order information in which a transmission order of data to the respective data terminal apparatuses is stored. A transmission system, wherein each of the data terminal devices is transmitted by a next destination data terminal device according to the transmission order.
Data terminal equipment that can transmit data.
Search means for searching, and a data terminal device determined to be transmittable by the search means.
Transmitting means for transmitting the data to be transmitted to the device, and a data terminal device determined to be untransmittable by the searching means.
Recording means for recording the device, and the next destination data terminal device in accordance with the above transmission order.
First, of the data terminal devices,
It is determined whether the transmitted data terminal device is the start data terminal device, and the
If the data terminal device is a start data terminal device,
The end processing request and the recording result of the recording means.
Comprising a termination processing request unit that, the, the data terminal device of the start, the end processing
The termination process is started in response to the request, and the recording of the recording unit is performed.
Differs depending on whether or not the transmission is not recorded in the result
A data transmission system wherein processing is performed .