JPH0823850B2 - Data transmission controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission control device that stores and updates data.

(Prior Art) A plurality of devices having the same function, for example, an electronic scale or a register may be connected by a bus line to form a system.

FIG. 5 (a) shows an example in which 16 electronic scales are connected by a bus line to transmit data, and a host in which processing such as product data registration and update is provided separately from the electronic scale. This is performed by using a control device such as a computer or one of the electronic scales as a master, and data common to each electronic scale is stored in a memory. The shared data in this case is either centrally managed by the control device or distributed and stored by each electronic scale.

FIG. 5 (b) shows an example of a system in which 16 registers having a storage function are connected by a bus line. In this case as well, either centralized data management by a common control unit or distributed data management by each register is used. Is adopted.

(Problems to be Solved by the Invention) When configuring a system in which a plurality of devices are interlocked with each other, a distributed management method of managing data in each device is used, and each device receives necessary data. Since it has, it can be said that it is more advantageous than the centralized management method in that the communication time by the bus line is unnecessary and high-speed processing can be performed. However, when all the linked devices use the same data, it is necessary to store the same data in each device. However, when correcting the stored data of any one device, There was a problem that the commonality with other devices was lost.

Therefore, the present invention provides a data transmission control device aiming at solving the problems of the prior art.

(Means for Solving Problems) A data transmission control device of the present invention includes a plurality of devices having a storage unit for storing communication data and a control unit for performing data communication with other devices, and the plurality of devices. A data transmission control device comprising a communication line for connecting and communicating data with each other, wherein the data transmitted through the communication line has a code for designating itself and a means for fetching the data to the own device. If the data does not exist in the storage unit, if it does not exist, it is newly registered in the storage unit. If it does not exist, it is further determined whether the data matches the data in the storage unit. Only the determination processing means for updating the data in the storage unit, the means for requesting the other device to send the data required by the own device to another device through the communication line, and the data for which the request for sending is received the above It is characterized in that each device is provided with means for judging whether or not it exists in the storage unit and, when there is, a code for designating a destination and transmitting the data through the communication line.

(Operation) With the above-described configuration, according to the present invention, processing such as registration and update of stored data can be performed from any position of the devices distributed in a plurality of places.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an example of an electronic scale to which the present invention is applied. This electronic scale comprises a weight detection unit 1 such as a load cell for measuring the weight of a product, an AD converter 2 for converting the analog measurement signal obtained by the weight detection unit 1 into a digital value, a microcomputer and the like. It comprises a unit 3, a display unit 4, a printer 5, a storage unit 6, a key input unit 7 including a numeric keypad, a function key and the like, and a bus line 8. An arithmetic control unit is connected to the bus line to transmit and receive data. .

The storage unit 6 includes a registration memory, a totaling memory, a setting memory, a scale number memory, etc.
Various data such as a calling number, a product code, a product name character code, and a unit price is registered in a predetermined area for each product. In the total memory, the sales amount of each product is totaled and stored.

A plurality of such electronic scales are connected by a bus line (communication line) as shown in FIG. 5 (a), and information is updated between individual electronic scales. Each electronic scale constantly monitors the information flowing through the communication line, and if the data necessary for itself is taken in, it is registered in the memory or the registered data is corrected.

FIGS. 2A to 2C are flowcharts showing the processing procedure of a device (in this example, a specific electronic scale) that sends data to a common communication line. Next, this flowchart will be described.

I. Ensure that the new registration [Fig. 2 (a)] performs data registration apparatus (in this example the electronic scale) has a margin in the memory in step S _1, step S ₂
Create stored data using the key input section, etc. in step S ₃
The storage data creation process is repeated until it is confirmed that the registration has been completed. When the completion of registration is confirmed, it is registered as stored data common to each device in step S ₄ , and transmitted on the line in step S ₅ . The other device has a receiving function and stores new data transmitted on the communication line.

II. Data modification [Figure 2 (b)] calls stored data from the memory in step S _11, to correct the stored data in step S ₁₂ by operating the key input unit. This correction process is repeated until corrected completed in step S ₁₃ is confirmed, then step if the corrected completion S ₁₄
Store in memory in the new format modified in step S
Send on line at ₁₅ . When the other device determines that the correction data transmitted on the line is necessary, it updates the contents of its own memory.

III. Request reception [Fig. 2 (c)] In this processing, if the required storage data does not exist in the memory of a certain device, another device is requested to provide the storage data. Send the message on the line as information or data. If there is a device that can handle this, the requested storage data is returned on the communication line. Specifically, the data requested at step S ₂₁ searches in memory, it is checked whether or not the relevant data in step S _22. If there is applicable data,
Create a Denbun of the stored data as the information or data for sending over the communication line in step S _23, transmits over the line in step S _25. If corresponding data does not exist, creates the information or data sends a response Denbun of N in step S ₂₄ on the communication line to send on the line.

In the above process, when the new registration of I and II and the data correction are performed by the dedicated control device [see FIGS. 5 (a) and 5 (b)], the data formed by this dedicated machine is transmitted on the communication line. As described above, the communication message of the request reception of III [Refer to FIG. 2 (c)] is transmitted to the device on the bus line, and the required memory data exists in the memory of the device. If not, a communication message including a request reception command ID, which will be described later, for requesting the other device to provide the stored data is formed by the device and transmitted to the communication line.

FIG. 3 is a flowchart showing a procedure for determining whether or not the data transmitted on the communication line is necessary for the own device and performing the registration or update process. next,
This flowchart will be described. Step S ₅₁ by the command ID included in the received Den sentence information or data transmitted via a communication line (command indicating the type of transmitted via the communication line data) transfer to a storage data Check if it is a sentence.

Here, the format of the communication message as information or data sent via the communication line is formed as shown in FIG. 4, and as shown in the figure, the start code S, the CM to which the command ID is assigned, and the message. A sentence and an end code E are provided. The command ID value makes it possible to identify the designation of each device on the communication line, the content of the message (stored data, etc.), such as the request of the product master, the reply of the product master, the communication of the actual data, and the reception of the request. ing. Step S ₅₁
If the determination is YES, then the contents of the received Denbun as information or data transmitted via the communication line in step S ₅₂ checks whether or not stored in the own device, If the determination is YES, it is confirmed in step S53 whether the received data and the stored contents of the device match. If the determination is NO, the data is updated in step S ₅₄ and the process ends.

If the determination is NO in the process of step S51, that is, if the command ID in the received message is not a message related to stored data, the process proceeds to another process in step S55. The process of step S55 includes the request reception process and the like. Here, the request receiving process will be described. Each scale on the bus line performs the process shown in FIG. 2 (C) when receiving the communication message having the command ID of the request receiving.

Further, when it is determined that does not store the received data in the own apparatus in step S _52, is newly stored data in the memory in step S _56.

In the above algorithm, it is a general theory, but when the determination is NO in step S _52, among the data transmitted, call number, product code, product name character codes, all data about products that require unit price step S Newly memorize at ₅₆ .

In step S53, the data other than the calling number and / or product code is decoded in the sent data, and if they do not match, the data other than the calling number and / or product code is updated in step _S54 . .

In addition, in the present invention, in addition to maintenance such as registration and update of stored data by interception of communication, sequentially generated result data is sent to a communication line, and all devices constituting the system receive the data and receive the data. Can be shared, and the memory contents of all devices can be kept in the same state.

Furthermore, the present invention can be applied to the case where the same data is partially stored in addition to the case where the same data is stored in all the devices.

Although the gist of the present invention has been described above with reference to the specified embodiment, it is apparent that various changes and modifications can be made to the present invention based on what has already been described.

(Effect of the Invention) As described above, according to the present invention, if all of a plurality of devices constituting a system are in the same state by connecting via a communication line, data input and correction from any device, It is possible to process and output the result data, and it is possible to operate from any position by using the devices distributed in multiple locations.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an electronic scale to which the present invention is applied, and FIG.
FIGS. 5A to 5C are flowcharts, FIG. 3 is a flowchart, FIG. 4 is an explanatory diagram, and FIGS. 5A and 5B are system configuration diagrams to which the present invention is applied. 1 ... weight detection unit, 2 ... AD converter, 3 ... calculation control unit, 4 ... display unit, 5 ... printer, 6 ... storage unit, 7
…… Key input section, 8 …… Bus line.

Claims (1)

[Claims] 1. Data comprising a plurality of devices having a storage unit for storing communication data, a control unit for performing data communication with other devices, and a communication line for connecting the plurality of devices for data communication. In the transmission control device, if the data transmitted through the communication line has a code designating itself, the means for fetching the data into the device itself and determining whether or not the fetched data is in the storage unit, If it does not exist, it is newly registered in the above storage unit, and if there is, it is further determined whether or not it matches the data in the above storage unit.
Only when there is a partial disagreement, a judgment processing means for updating the data in the storage section, a means for requesting the transmission of the data required by the own device to another device through the communication line together with a code indicating the self, and a transmission request. Data transmission, characterized in that each device is provided with means for judging whether or not the received data exists in the storage section, and if there is, a code for designating a destination and transmitting the data through the communication line. Control device.