JPH10164172A - Text data transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the end of reception due to the wrong recognition of a string of received variable length text code data by converting the specific binary code data, adding the conversion notification symbol at a position immediately preceding a text conversion symbol to transmit it, and restoring the text conversion signal following the conversion notification symbol at the receiver side. SOLUTION: If the end-of-text code data are supposed as 03, for example, a transmitting terminal equipment 10 converts the binary code data 03 on a single word of the text code data into a text conversion symbol, e.g. Y that is previously defined. At the same time, the equipment 10 adds a conversion notification symbol, e.g. X before the symbol Y and transmits the code data on both symbols X and Y via a transmission line 30. A receiving terminal equipment 20 converts the symbol Y that is received after the symbol X into the binary code data on a single word and restores it into the original text code data 03 if the symbol X is included in a received text code data string.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a text data transmission method in serial data transmission, and more particularly to a text data transmission method capable of transmitting a variable length Texas text without limitation without setting a field indicating a data length of a text decode to be transmitted. .

[0002]

2. Description of the Related Art When data communication is performed between data terminal devices connected via a communication line, data transmitted by a data terminal device on a transmitting side must be accurately received by a data terminal device on a receiving side. . For this purpose, a method of using a predetermined transmission format, specifying the data length of the data body to be transmitted on the transmission side in the transmission format and transmitting the data, and identifying the reception of the data body on the reception side based on the specification information of the data length There is.

[0003] For example, start of text (STX)
Data (ARD) indicating the address to be transmitted after
And length data (NUM) indicating the number of words of a variable length text, checksum code data (CHK) transmitted after the text (TEXT), and end-of-text (EXT) indicating the end of the text. Variable length text data (binary code) is transmitted using the transmission format that composes the frame. On the receiving side, the start of text transmission is identified by STX code data, and its own address and ARD code data are used. The data is collated, the number of words of the text indicated by the NUM code data is set in the register, and the pointer is incremented and stored in the reception area indicated by the pointer each time code data of one word is received. T matches with the number of words stored in the register
Identifies the completion of the reception of the EXT code data, receives the CHK code data and the last EXT code data, adds the received ADR code data to the last one-word code data of the EXT, and checksum data. A serial data transmission method is proposed in Japanese Patent Application Laid-Open No. 60-204143, in which the calculation result is compared with the received CHK code data, and the reception is terminated when they match.

[0004]

In the above-described conventional serial data transmission method, length data indicating the number of words of variable-length data is set in a transmission frame.
Even if variable-length data such as text contains the same code data as the STX and EXT code data, it is possible to prevent the reception start operation from being performed again or the reception end operation in the middle, but the transmission frame does not include the variable-length data. Since it is necessary to set a field dedicated to length data indicating the number of words, 1
The length of text data that can be transmitted in a frame is limited.

[0005] Further, since a special length data field must be set in addition to the text data to be transmitted, when transmitting more text data,
It is necessary to increase the number of bytes in a field dedicated to length data, and the number of data other than text data to be transmitted increases, resulting in lower transmission efficiency.

An object of the present invention is to convert one word of a variable-length text code data string into a predetermined symbol according to a predetermined conversion rule between data terminals when the binary code of one word is the same as the end-of-text code data. The present invention is to provide a text data transmission method in which the text data is transmitted and restored on the receiving side to the original one-word binary code text code data.

[0007]

According to the text data transmission method of the present invention, a destination address code data, a text code data, and an end-of-text code data indicating the end of the text code data are provided after the start of the text code data. Using a transmission format that constitutes one frame in field order, each word of variable-length text code data is transmitted as binary code data, and the start of the text transmission frame is started on the receiving side with start-of-text code data. Identifying and receiving the text code data, and then ending the reception by identifying the end-of-text code data. In the text data transmission method in serial data transmission, one word of binary code data in the data string of the variable length text code is provided. Is When it is the same as the do-of-text code data, the one-word binary code data identical to the end-of-text code data is converted into a predetermined text conversion symbol in accordance with a predefined conversion rule, and the text conversion symbol is converted in accordance with the conversion rule. A conversion notification symbol for notifying that a predetermined symbol has been converted is added immediately before the text conversion symbol and transmitted, and the received variable length text code data string includes the conversion notification symbol. At this time, the text conversion symbol following the conversion notification symbol is converted in accordance with the conversion rule to restore the original one-word binary code data.

Further, the conversion rule is that, when one word of binary code data in the data string of the variable length text code is the same as the end of text code data, the same one word of binary code data is converted to a predetermined value. A conversion notification symbol X indicating that the text conversion signal Y is a conversion symbol of one-word binary code data of the text code data is added immediately before the text conversion symbol Y, A first conversion rule for transmitting one-word binary code data of the text code data identical to the text code data as XY symbol code data, and one-word binary code data in the data string of the variable-length text code Is the code of the conversion notification symbol X converted according to the first conversion rule. When data and the same, as the same 1
The word binary code data is converted into a predetermined text conversion symbol Z, and a conversion notification symbol X indicating that this text conversion signal Z is a conversion symbol of one-word binary code data of the text code data is converted to the text conversion symbol Z. And one word of binary code data of the same text code data as the code data of the conversion notification symbol X converted according to the first conversion rule and transmitted as XZ symbol code data. And when the one-word binary code data in the data string of the variable-length text code is different from the end-of-text code data and the conversion notification symbol X converted according to the first conversion rule, One-word binary code data of the code data string is transmitted without conversion Characterized in that it consists of a third transformation rule.

Further, the variable-length text code data string transmitted in accordance with the first, second, and third conversion rules is received in the transmission format, and the received variable-length text code data string is provided with the conversion notification symbol X. , And when the code data following the conversion notification symbol X is the text conversion symbol Y, the text conversion symbol Y is converted and restored to the original one-word binary code data, and the received variable length The text code data includes the conversion notification symbol X, and the text code data following the conversion notification symbol X is the text conversion symbol Z.
When the text conversion symbol Z is converted to the original one-word binary code data and restored, and when the received variable-length text code data does not include the conversion symbol X, the text conversion code Z is converted. It is characterized in that it is received without being used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a text data transmission method according to the present invention, and FIG. 1A is a diagram illustrating conversion of text data according to a first conversion rule. (B)
FIG. 9 is a diagram showing conversion of text data according to a second conversion rule. (C) is a diagram showing transmission of text data according to the third conversion rule of the present invention. FIG. 2 shows the first and second embodiments of the present invention.
FIG. 11 is a diagram illustrating a reception flow of text code data converted according to the conversion rules of 2 and 3.

The text data transmission method of the present invention is shown in FIG.
As shown in FIG. 1, the transmitting terminal apparatus 10 and the receiving terminal apparatus 20 are connected via a transmission line 30. Although not shown, the transmitting terminal apparatus 10 has start-of-text code data (ST
X), destination address code data (ARD),
Each word of variable-length text data is converted into a binary code using a transmission format that forms one frame in the field order of text code data (TEXT) and end-of-text code data (EXT) indicating the end of the text code data. And the receiving terminal device 20
Identifies the start of a text transmission frame with start-of-text code data, receives variable-length text code data, identifies end-of-text code data, and ends reception.

FIG. 1A shows the transmission and reception of text code data according to the first conversion rule. Assuming that the end-of-text code data (EXT) is, for example, "03", the text code transmitted by the transmission terminal device 10 will be described. If the data string contains the same one-word binary code data as EXT “03”, it is possible to prevent the receiving side from erroneously recognizing the text code data as EXT “03” and performing reception termination processing. And 1 of the text code data
The word binary code data “03” is converted into a predefined text conversion symbol, for example, “Y”, and 1
A conversion notification symbol indicating that the binary code data “03” of the word has been symbol-converted, for example, “X” is added before the text conversion symbol “Y”, and the code data of “X, Y” is transmitted through the transmission line 30. To the receiving terminal device 20 via the.

The receiving terminal device 20 identifies the head of the text data transmission frame with STX code data and identifies itself with ARD, and receives the text code data string. When the conversion notification symbol “X” is included in the text code data string, the text conversion symbol “Y” received next to the conversion notification symbol “X” is converted into one-word binary code data, and Is restored to the text code data “03”.

FIG. 1B shows the transmission and reception of text code data according to the second conversion rule. When the conversion notification symbol X converted according to the first conversion rule is assumed to be, for example, "02", the transmitting terminal 10 The conversion notification symbol "X" converted by the first conversion rule in the text code data string transmitted by
If the same one-word binary code data "02" as the code data "02" is included, the one-word binary code data "02" of the text code data is converted to a predefined text conversion symbol, for example, "Z". Along with the conversion, a conversion notification symbol "X" indicating that one-word binary code data "02" of the text code data has been symbol-converted is added before the text conversion symbol "Y",
The code data of “X, Z, Y” is transmitted to the receiving terminal device 20 via the transmission line 30.

Further, for example, when the text data string before conversion includes the text data of “X, Y”, according to the first conversion rule, “X” is replaced with the text conversion symbol “Y”. And a conversion notification symbol "X" indicating that the symbol conversion has been performed is added before the text conversion symbol "Y", and the "X, Y, Y" code data is transmitted via the transmission path 30 to the receiving terminal. To the device 20, and the receiving terminal device 20
Since the conversion notice symbol "X" is recognized and the subsequent text conversion symbol "Y" is restored to "03", the text data of "X, Y, Y" is converted to "03, Y". , A second conversion rule is defined to prevent this.

The receiving terminal device 20 identifies the head of the text data transmission frame with the STX code data and identifies itself with the ARD, and receives the text code data. When the conversion notification symbol "X" is included in the text code data string, the text conversion symbol "Z" received next to the conversion notification symbol "X" is converted into one-word binary code data and converted to the original word. Is restored to the text code data “02”.

FIG. 1C shows the transmission and reception of text code data according to the third conversion rule. The text code data string transmitted by the transmitting terminal device 10 includes the first conversion rule and the second conversion rule. If the conversion notification symbol “X” is not included, the binary code data of the text code data, for example, “10”, “11”, is transmitted to the receiving terminal device 20 via the transmission line 30 without conversion. .

The receiving terminal device 20 identifies the head of the text data transmission frame by the STX code data and identifies itself to the self by the ARD, and receives the text code data. If the conversion notification symbol “X” is not included in the text code data string, the text code data “10” and “11” are received without conversion.

Next, the conversion process in the receiving terminal device will be described with reference to FIG. The receiving terminal device 20 is connected to the transmission path 3
The binary code of the text code data string transmitted by the transmitting terminal device 10 via the “0” is received (Step S101 in FIG. 5).

The received text code data sequence is received in order from the beginning, and it is monitored whether or not the conversion notification symbol “X” is separated. If the conversion notification symbol “X” is not included, the third And is received as it is without conversion according to the conversion rule (S108).

In step S102, if the conversion notice symbol "X" is included in the received text code data string, the next code data following the conversion notice symbol "X" is received (S103). It is monitored whether the next code data following the conversion notification symbol "X" is the text conversion symbol "Y" (S104). If the text conversion symbol "Y" is identified, the text conversion is performed in accordance with the first conversion rule. The symbol "Y" is converted into one-word binary code data "03" and received (S105).

In step S104, if the next code data following the conversion notification symbol "X" is not the text conversion symbol "Y", it is monitored whether the text conversion symbol "Z" is present (S106). If the next code data following the conversion notification symbol "X" is not the text conversion symbol "Z", the process proceeds to step S102, and if it is the text conversion symbol "Z", the second conversion is performed. The text conversion symbol "Z" is converted into one-word binary code data "02" and received according to the rules (S
107).

Therefore, even if the variable-length text code data string contains the same one-word binary code data as the end-of-text code data, the binary code data is symbolized according to the first and second conversion rules defined in advance. Since the data is converted and transmitted, and converted into the original one-word binary code data in accordance with the conversion rule on the receiving side, the data is erroneously recognized as end-of-text code data during reception of the variable-length text code data string, and the reception processing is terminated. Can be prevented.

[0024]

As described above, according to the present invention, when the variable-length text code data string to be transmitted contains the same one-word binary code data as the end-of-text code data, one word of the text code data is used. Is converted to a predefined text conversion symbol "Y", and a conversion notification symbol indicating that one-word binary code data is symbol-converted, for example, "X" is converted to a text code conversion symbol "Y". , The code data of “X, Y” is transmitted, and the same one-word binary as the code data of the conversion notification symbol “X” converted according to the first conversion rule in the text code data string to be transmitted. If code data is included, one-word binary code data of the text code data is a text conversion symbol defined in advance. Converts to Z ", assigned conversion notification symbol indicating you have symbol converting one word binary code of" X "in front text conversion symbol" Z ",
When the code data of "X, Z, Y" is transmitted, and the text code data string to be transmitted does not include the same one-word binary code data as the end-of-text code data or the conversion notification symbol "X" Is transmitted as it is without conversion, and when the conversion notification symbol X is included in the received text code data string, the received code data following the conversion notification symbol “X” is replaced with the text conversion symbol “Y”. In the case of, the text conversion symbol "Y" is converted into one-word binary code data to restore the original text code data, and the code data received after the conversion notification symbol "X" is replaced with the text conversion symbol "Z". In the case of, the conversion symbol "Z" is converted into one-word binary code data, restored to the original text code data, and converted into a text code data string. If the symbol "X" is not included, the data is received as it is without conversion. Therefore, while the text code data string is being received, the text code data string is erroneously recognized as end-of-text code data, and the reception is completed during transmission of the text code data string Operation can be prevented.

[Brief description of the drawings]

1A and 1B are diagrams showing a method of transmitting text data according to the present invention, wherein FIG. 1A shows the conversion of text data according to a first conversion rule, and FIG. 1B shows the conversion of text data according to a second conversion rule; (C) is a diagram showing transmission of text data according to a third conversion rule.

FIG. 2 is a diagram showing a reception flow of text code data converted according to the first, second, and third conversion rules of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transmission terminal device 20 Receiving terminal device 30 Transmission path

Claims (3)

[Claims] 1. A transmission format that forms one frame in the field order of destination address code data, text code data, and end-of-text code data indicating the end of the text code data after the start of text code data. Then, each word of the variable-length text code data is transmitted as binary code data, and the receiving end identifies the start of the text transmission frame with the start of text code data, receives the text code data, and then transmits the end of text data. In the method of transmitting text data in serial data transmission in which code data is identified and reception is terminated, when one word of binary code data in the data string of the variable length text code is the same as the end-of-text code data, That one-word binary code data identical to the do-of-text code data is converted into a predetermined text conversion symbol according to a predefined conversion rule, and that the text conversion symbol is converted into a predetermined symbol according to the conversion rule. A conversion notification symbol for notification is added immediately before the text conversion symbol and transmitted,
When the received conversion notification symbol is included in the received variable-length text code data string, the text conversion symbol following the conversion notification symbol is converted according to the conversion rule, and converted into the original one-word binary code data. A text data transmission method characterized by restoring. 2. The method according to claim 1, wherein when one word of binary code data in the data string of the variable length text code is the same as the end of text code data, the same one word of binary code data is converted to a predetermined value. A conversion notification symbol X indicating that the text conversion signal Y is a conversion symbol of one-word binary code data of the text code data is added immediately before the text conversion symbol Y;
A first conversion rule for transmitting one-word binary code data of the text code data identical to the end-of-text code data as XY symbol code data; and a one-word binary in the data string of the variable-length text code. When the code data is the same as the code data of the conversion notification symbol X converted according to the first conversion rule,
The same one-word binary code data is converted into a predetermined text conversion symbol Z, and a conversion notification symbol X indicating that the text conversion signal Z is a conversion symbol of one-word binary code data of the text code data is set to the above-mentioned. One word binary code data of the same text code data as the code data of the conversion notification symbol X, which is added immediately before the text conversion symbol Z and converted according to the first conversion rule, is transmitted as the symbol code data of XZ. 2, when one word of binary code data in the data string of the variable-length text code is different from the end-of-text code data and the conversion notification symbol X converted according to the first conversion rule, Without converting the one-word binary code data of the variable-length text code data string. 2. The text data transmission method according to claim 1, further comprising a third conversion rule for transmitting the text data as it is. 3. The variable-length text code data string transmitted according to the first, second, and third conversion rules is received in the transmission format, and the received variable-length text code data string includes the conversion notification symbol X Is included, and when the code data following the conversion notification symbol X is the text conversion symbol Y, the text conversion symbol Y is converted into the original one-word binary code data and restored.
When the received variable-length text code data includes the conversion notification symbol X and the text code data following the conversion notification symbol X is the text conversion symbol Z, the text conversion symbol Z is converted to the original one word. 2. When the received variable-length text code data does not include the conversion symbol X, the text code data is received without conversion. , 2 text data transmission method.