JP3317550B2 - Data transmission method, transmission device, and reception device - 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 apparatus, and more particularly to a data transmission method for reducing the amount of data to be transmitted, a transmission apparatus, and a reception apparatus.

[0002]

2. Description of the Related Art When data is transmitted between different apparatuses A and B, a predetermined format agreed between the two apparatuses, whether wired or wireless, as shown in FIG. In accordance with the data transmission and reception. FIG. 3 shows an example of the transmission. The transmission side sends data 1 (text 1) to the reception side, the reception side receives the data and returns a response signal, and the transmission side sends data 2 (text 2) again.

[0003] For transmission in accordance with a pre-specified format, there is a limit to the items to be transmitted and received in one message due to the relationship between the data length and the error rate. For this purpose, there is an example in which the one-message multiple-text method shown in FIG. 5 is adopted from the one-message one-text method shown in FIG. Here, FIG.
Here, an example is shown in which a control code is placed at the head as text 1 and items 1, 2,..., N are added thereafter. In this way, n cannot take a large value. Therefore, FIG.
As an example of the case where n is large, all the items are divided into sections each having a small number of items, and a unique text number is assigned to each section. Then, they are transmitted in the order of each text. Figure 6 (b) shows an example of data by adding the code f _i to the numerical data. When converting this to text, the format is as shown in FIG.

[0004]

FIG. 7 shows a transmission failure (NG) of text 1 in a plurality of texts in one message shown in FIG.
An example of recovery is shown below. An example is shown in which retransmission is performed for the first transmission failure, which further fails, and succeeds in the third transmission. FIG. 8 shows n in one message and plural texts.
Shows an example of text transmission. For transmission failure (NG), retransmission is performed, and every time transmission succeeds, the receiving side accumulates text data (items) and performs this over the entire text.

[0005] The transmission under one text and a plurality of texts is inefficient in data transmission, and recovery means when a failure (transmission failure) occurs is complicated. When data spans a plurality of telegrams, it is necessary to recover the failed data into one data while accumulating the data.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data transmission method, a transmission apparatus, and a reception apparatus capable of transmitting data having a long number of items with a small number of data without converting into a plurality of texts.

[0007]

According to the present invention, a small item to be transmitted is registered in a small item definition table, and at the time of transmission, the transmission corresponding item position of this small item definition table is set to "1". A data transmission method for transmitting data of a small item instruction table corresponding to a small item definition table in which the item position is set to "0" is disclosed.

Further, according to the present invention, the data is stored in the storage means for each item, and the item to be transmitted is attached with a flag indicating whether or not the item is to be transmitted in small item units constituting the item. The disclosed data transmission method is disclosed.

Further, according to the present invention, a plurality of sub-item definition tables defining sub-items to be transmitted, and a sub-item indicating whether or not to transmit corresponding to the sub-item definition table name to which the selected sub-item belongs. There is disclosed a transmitting apparatus including: a unit that creates an item instruction table; and a unit that sends out the created small item definition table name and the small item instruction table.

Further, the present invention provides a means for receiving a sub-item definition table name and a sub-item instruction table sent from a transmitting device, a plurality of sub-item definition tables for reception defining sub-items to be received, From the received sub-item definition table name, a corresponding sub-item definition table for reception is selected, and the selected sub-item definition table for reception is associated with the received sub-item instruction table to indicate that the sub-item instruction table should be transmitted. Means for reading a small item at the indicated position and making it a received small item is disclosed. Further, the present invention discloses a transmission / reception device including the transmission device and the reception device.

[0011]

FIG. 9 shows an embodiment of the apparatus A (or B) in this embodiment. The devices A and B are assumed to be different from each other as shown in FIG. 2, but in FIG. 9, the systems have the same configuration. That is, each of the devices A and B includes a microprocessor 1, a program (memory) 2, a work memory 3, a definition table 4, an external memory interface 5, a transmitting / receiving unit 7, an input / output interface 8, and a common bus 6. In addition, an input / output device 9 and an external memory 10 are provided. As described above, the system has the same configuration, but the specifications, styles, capacities, and the like of the components are different (this means that the devices are different in this respect). However, the definition table 4 has the same contents on both the transmitting side and the receiving side.

The configuration and operation of the apparatus shown in FIG. 9 will be described in two cases, that is, a case where the apparatus is on the transmitting side and a case where it is on the receiving side.

(1) When the transmission side is set. On the transmitting side, the creation and transmission of transmission data is the basis of operation. The transmission data is created by the microprocessor 1 using a program in the memory 2. The created transmission data is latched once in the work memory 3 and then sent via the transmission / reception unit 7. The response from the other party is received by the transmission / reception unit 7, and it is determined whether or not retransmission is to be performed. After retransmission, the microprocessor 1 continuously transmits the same data as the previous one, and if the reception is normal, continuously transmits new data. The external memory 10 may have data to be transmitted. In this case, the data is fetched via the external memory interface 5 and the microprocessor 1 transmits the data or data created based on the data. I do. The input / output device 9 is used for setting data to be transmitted and various operations for transmission. The definition table 4 is used for creating transmission data.

(2) The case where the receiving side is set. On the receiving side, processing of checking the received data and storing the received data if it is normal received data is performed. The transmission / reception unit 7 checks whether or not there is a failure from the data sent from the transmission side, and if a failure occurs, issues a retransmission request. If the reception is normal, a report to that effect is sent to the microprocessor 1, and the microprocessor 1 stores the received data in the work memory 3 using the program 2. Further, this is sent to the external memory 10 via the interface 5. Further, the corresponding true data (item) is found from the received data using the definition table 4. Further, the input / output device 9 is used for various operations during the reception.

Next, the data transmission format of the present invention is shown in FIG. The text in this embodiment is an example of one text per one message. A control code is provided at the head, a table name to be transmitted is placed after that, a small item designation table is placed after this large item name, and Data with undefined data.

(1) Control code: a display code (attribute, character of text,
Item relation).

(2) Table name... Indicates a table name to be transmitted, and indicates either a small item designation table name or a small item definition table name to be described later. This is because both tables correspond one-to-one. The figure shows an example of m table names (T ₁ ), (T ₂ ),... (T _m ). Here, the table name (T _i ) indicates the small item designation table T _i . Therefore, if the data to be transmitted is, for example, 8
If it belongs to one small item instruction table, this 8
The two small item designation table names are respectively used as table names.

(3) Small item designation table T _i ... There are a plurality of tables. The small item instruction table corresponds to the small item definition table. FIG. 10 shows the relationship between the two. FIG. 10A shows an example of the small item definition table _Si, which is an example of a table having a size of 8 × 8. The table S _i, total 64 small items of a ₁₁ ~a ₈₈ is registered (defined). The small item designation table T _i has the same size of 8 × 8 as the small item definition table S _i , and a ₁₁
The position of only the item to be transmitted in ~ a ₈₈ is set to "1",
This is a table in which the positions of items not to be transmitted are set to “0”.
Among the plurality of small item definition tables, a small item instruction table is not created for a small item definition table that does not have a small item to be sent at the time of sending. Create a small item designation table only when it should be sent. This eliminates the need to create an unnecessary small item instruction table (all "0"), and eliminates the need to send it. Here, a specific example of the _two small item definition tables S ₁ and S ₂ is shown in FIG.

FIG. 11 (a) ... table letter S ₁ designates a, an example in which registered (symbols). FIG. 11 (b) ... table S ₂ is an example that has registered a foreign language. In addition, there are various definition table examples such as a numerical value registration example, a hexadecimal display numerical example, and an image data example.

As described above, if there is at least one small item (for example, a ₂₁ ) to be transmitted in a certain small item definition table,
A sub-item instruction table for the sub-item definition table to which the sub-item belongs is created, and this table is loaded as transmission data. There are various ways of sending the small item instruction table, such as a method of reading by the raster scan method and sending it for each item position, and a method of sending it for each row or column. For example, in the latter example, 8 in the example of the size of the table T _i of × 8, the Toka row Toka column unit becomes 1 byte, which is preferable as a delivery unit. The undefined data at the end of FIG. 1 is defined as
Indicates the undefined data itself when sending undefined data. Because it is not defined in the table, we decided to add undefined data directly. Of course, an error check code may be added after this.

The creation of transmission data in the format of FIG. 1 is shown in FIG.
In performed by the microprocessor 1 as described, adapted to store small items definition table S _i at that time is a table 4. The microprocessor 1, an instruction or software instruction from the input and output device 9, receives a designation of sub-items to be delivered, to create a small item instruction table T _i corresponding to the definition table S _i which belongs this sub-item. The created table T _i and this table name (T _i ) are created in the order shown in FIG. In general,
There are a plurality of small items to be sent out, and there are also a plurality of small item definition tables S _i to which the small items belong. Therefore, there are also a plurality of small item designation tables T _i .

On the side receiving the data in the format of FIG. 1, the control code at the head is read to confirm that the data is in the format of the present embodiment. Then, the subsequent table names (T ₁ ), (T ₂ ),..., (T _m ) are received,
This table name (T
_{1), (T 2),} ..., definition table S ₁ belonging to (T _m),
S ₂ ,..., S _m are selected, and the small item instruction tables T ₁ , T ₂ ,
.., A small item at a position where “1” exists in T _m is extracted. By arranging the sub-items, a series of sub-items sent in this text is obtained.

According to the present embodiment, a small item definition table having the same definition is provided on both the transmitting side and the receiving side as compared with a case where a series of small items are sent directly, and the number of data is small. All small items can be sent.

If there is a shortage in the small item definition table, new small items may be defined one after another, and the number of data does not become enormous.

[0025]

According to the present invention, it is possible to transmit a large number of items with a small number of data simply by providing a definition table on each of the transmitting side and the receiving side and designating an item position of the definition table. Was.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a transmission format according to the present invention.

FIG. 2 is a diagram illustrating wired and wireless communication between different devices.

FIG. 3 is a data transmission / reception time chart.

FIG. 4 is a diagram showing a transmission format using one message and one text.

FIG. 5 is a diagram showing a transmission format based on one message multi-text.

FIG. 6 is a text configuration diagram according to a specific example of data.

FIG. 7 is a transmission / reception time chart due to a retransmission request due to a data transfer failure.

FIG. 8 is a diagram showing transmission and reception on the transmission side and the reception side in data transfer.

FIG. 9 is a diagram showing an embodiment of transmission and reception devices according to the present invention.

FIG. 10 is a diagram showing a relationship between a small item definition table S _i and a small item designation table T _{i according} to the present invention.

FIG. 11 is a diagram showing a specific example of the small item definition tables S ₁ and S ₂ of the present invention.

[Explanation of symbols]

 A, B devices 1 Microprocessor 2 Program (memory) 3 Work memory 4 Definition table 5 External memory interface 7 Transmitter / receiver 9 Input / output device 10 External memory

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04L 29/00

Claims (5)

(57) [Claims] 1. A small item to be sent is registered in a small item definition table, and when sending a small item, the position of the item to be sent out in the small item definition table is set to "1", and the item position other than that is set to "1". A data transmission method in which data of a small item instruction table corresponding to a small item definition table, which is set to 0 ", is transmitted. 2. The data is stored in the storage means for each item, and when an item is sent, the item is sent with a flag indicating whether or not it should be sent in small item units constituting the item. The data transmission method used. 3. A plurality of sub-item definition tables defining sub-items to be transmitted, and a sub-item instruction table indicating whether or not transmission is to be performed in accordance with the sub-item definition table name to which the selected sub-item belongs. And a means for transmitting the created small item definition table name and the small item instruction table. 4. A means for receiving a sub-item definition table name and a sub-item instruction table sent from the transmitting apparatus according to claim 3, and a plurality of reception sub-item definition tables defining sub-items to be received. The corresponding small item definition table for reception is selected from the received small item definition table name, and the selected small item definition table for reception should be associated with the received small item instruction table to transmit the small item instruction table. And a means for reading out and receiving the small item at the position indicated by. 5. A transmitting / receiving device comprising the transmitting device according to claim 3 and the receiving device according to claim 4.