JPS62194765A - Data transmission system - Google Patents

Abstract

PURPOSE:To sends surely a data form as it is to an opposite party by converting each code series into a transmittable code series not coincident with the code series of a transmission control character in advance in sending a transfer data to a non-transmission type transmission line. CONSTITUTION:In sending a data from a computer system 1 to a system 2, each transmission data is read continuously from an auxiliary memory device 3 and an input/output controller 4, it is outputted to a data conversion means 5 and subjected to conversion request. The data conversion means 5 being the 1st data conversion means forms converts each data code series of the transmission data into a conversion data of a code series not coincident with the code series of the transmission control character and outputs the data to a compression means 6 together with a data compression request. The transmission data formed by the compression means 6 is sent to an expanding means 11 of the reception side computer system 2 via the non-transmission type transmission line consisting of a communication controller 8, a communication line 9 and a communication controller 10.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a data transmission method, and relates to a data transmission method in which communication between information devices having data processing functions such as computers is performed via a non-transparent transmission path. Regarding the method.

(Prior Art) The basic control procedure, which is one of the transmission control procedures on the transmission path, is SOH (Start of llready).
ng).

STX (Start of Text), ETX
It defines 10 transmission control characters such as (End of Te-xt), and transmits and receives code strings in a predetermined format between two devices, and the same code string as the transmission control character code string. In other words, the transmission path based on the basic control procedure is a non-transparent transmission path, but the control procedure is relatively simple, so it can be used with information devices with data processing functions such as computers and keyboards. It is well known that this technology is used not only for communication between terminals such as printers, but also for communication between information devices.

(Problems to be Solved by the Invention) By the way, when information equipment performs arithmetic on numerical data, it is done in a pack format, so it would be very convenient if data could be exchanged between information equipment in the pack format. However, if the data code string in the packed format is sent as is to the non-transparent transmission line, there is a risk that it will match the transmission control code, causing a transmission error, so it cannot be simply transferred. Therefore, conventionally, data in packed format is converted to data in unpacked format that does not match the transmission control code before being sent to the transmission path, but since the data to be transferred is converted to twice the capacity, it takes longer to transfer. There is a problem in that the amount is doubled.

In addition, program modules are exchanged in communication between information devices, but since the code string of program data is an arbitrary bit pattern, program modules cannot be exchanged via a non-transparent transmission path. There is also a problem. The present invention has been made by focusing on such conventional problems, and its purpose is to improve the transmission control character when communication between information devices having data processing functions is carried out via a non-transparent transmission path. The object of the present invention is to provide a data transmission method that can avoid code string restrictions.

(Means for Solving the Problems) The data transmission system of the present invention has the following configuration in order to achieve the above object.

That is, the data transmission method of the present invention is a data transmission method in which communication between information devices having data processing functions is performed via a non-transparent transmission path; As a means for forming transmission data to be sent out, receiving transfer data consisting of a continuous fixed length code string of m bits, and converting the bit string of the transfer data into at least 2 +
1 (however, 0 < i < 2) data bits are divided, m-1 off bits are added to the data bits thus divided, and converted data consisting of a continuous constant length code string of m bits is obtained. a first data conversion means for converting each code string of the converted data into a transferable code string that does not match the code string of the transmission control character; a second data converting means that performs a conversion operation opposite to that of the first data converting means on the received data;
It is characterized by having data conversion means.

(Function) Next, the function of the data transmission system of the present invention configured as described above will be explained.

When the information device transmits the transfer data to the other party information device via the non-transparent transmission path, the information device uses the first data conversion means to first convert each data code string of the transfer data so that it does not match the code string of the transmission control character. The converted code string is converted into a code string, and transmission data is formed based on this converted code string. The conversion operation performed by this first data conversion means is as follows.

That is, for example, if m=8 and i=2, the transferred data is 8
It is a continuous bit-structured code string. Here, if the number of data to be transferred is "3", the total number of bits is 24 bits, so this bit string is divided into 1+i=6 data bits, and the data bits thus divided are Add code -1 = 2 off pits, ie, '0' bit, to the beginning to form converted data with a continuous 8-bit code string.The number of data in the converted data formed here is 4. It is. In other words, first, 3 data is converted into 4 data.

The bit patterns obtained for each data of this conversion data are 64 types from 0016 to 3F16,
At this stage, it may still match the code string bit pattern of transmission control characters such as STX, ETX, etc.
Next, for example, 0016→20□6, 0116-2116
．． ..., 3Fsc, →5F16 to form a transferable code string that is not a transmission control character code string.

When the information device receives the transferred data from the other party's information device via the non-transparent transmission path, the second data converting means converts the received data received from the non-transparent transmission path into the second data converter. The data conversion means 1 performs a conversion operation opposite to that of the data conversion means 1.

As described above, according to the data transmission method of the present invention, when sending transfer data to a non-transparent transmission path, each code string of the transfer data is preset as a transferable code that does not match the code string of the transmission control character. Since data conversion processing is performed to convert the data into columns, even if the transferred data is in a back format or a program module, it can be reliably transmitted to the other party in the same data format. Furthermore, since the conversion operation performed by the first data conversion means of the present invention converts, for example, three data into four data, the transfer data length becomes slightly longer. However, since the conversion is done by adding an off-pit,
The number of combinations of bit patterns in a code string of one data after conversion is significantly smaller than the number of combinations of bit patterns in a code string of one data before conversion. In other words, the probability that the converted data will be continuous is increased by repeating the same code string.

As is well known, in this type of data transmission method, data is usually compressed in order to increase transmission efficiency. However, according to the present invention, compression efficiency is increased, so that the length of transferred data can be substantially reduced. This provides an excellent effect in that the length can be made shorter and the transmission efficiency can be further improved than in the past.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a configuration block diagram of a data transmission system according to an embodiment of the present invention.

In this data transmission method, communication between computer systems 1 and 2 as information equipment is carried out via communication path 9, and each computer system has auxiliary storage devices 3, 15,
input/output control devices 4 and 14; data conversion means 5 as first data conversion means and second data conversion means;
13, compression means 6, 12, expansion means 7, 11
and a communication control device 8 and a communication control device 10.

Next, the functions of each part when transferring data from the computer system 1 to the computer system 2 will be explained.

The auxiliary storage device 3 is an external storage device that stores transfer data. The transfer data includes pack format data, program modules, etc., and one data consists of a code string of 8 bits.

The input/output control device 4 continuously reads each data of the transfer data from the auxiliary storage device 3, outputs it to the data conversion means 5, and requests the data conversion means 5 to convert.

The data conversion means 5, as a first data conversion means, converts each data code string of the transfer data into converted data of a code string that does not match the code string of the transmission control character, and outputs it to the compression means 6 together with a data compression request. do. The details of the data conversion operation performed by the data conversion means 5 as the first data conversion means will be described later.

The compression means 6 receives the output of the data conversion means 5, performs compression processing on the repetition of the same code string, forms necessary transmission data, and outputs it to the communication control device 8 together with a transmission request.

The communication control device 8 controls the transmission of transfer data on the communication path 9 together with the communication control device 10 of the receiving side computer system 2, and is the object of the present invention.
The transmission control performed by 0 uses the basic control procedure.

That is, the transmission data formed by the compression means 6 is transmitted to the expansion means 11 of the receiving computer system 2 via a non-transparent transmission path composed of a communication control device 8, a communication path 9, and a communication control device 10. .

At this time, since the code string of the transmission data does not match the code string of transmission control characters such as SOH, STX, and ETχ defined in the basic control procedure, the transmission data is transmitted to the communication control device i! In step 10, the transmission control character is correctly identified. Since the transmitted transmission data has been compressed, the expansion means 11 performs expansion processing on the transmission data, restores the converted data before compression processing, and converts it to the data conversion means 13.
Output to. As a receiving operation, the data converting means 13 operates as a second data converting means for restoring the converted data to the transfer data before the conversion process, and reproduces the required received data. The input/output control device 14 outputs the reproduced received data to the auxiliary storage device 15 together with a transfer data storage request,
The received data is stored in the auxiliary storage device 15.

Next, the operation of the data conversion means will be explained with reference to FIGS. 2 to 4. Note that the data conversion means 5 and 13 are the first
The operation of the data conversion means and the operation of the second data conversion means are performed, but since the operation of the second data conversion means is only the reverse operation of the first data conversion means, the first data conversion means will be described below. Only the operation of the data conversion means will be explained.

FIG. 2 shows a general data conversion operation for transfer data, and FIGS. 3 and 4 show data conversion operations on the rearmost side of transfer data.

In FIG. 2, the transfer data input to the data conversion means 5 and 13 are a plurality of data #1. Same #2. Same #3.
. . . are consecutive (FIG. 2(a)), and each data consists of an 8-bit code string (FIG. 2(b)). In such transfer data, data is divided into, for example, every 6 bits starting from the first bit of the first data #1 (Fig. 2(b)),
Two off-bits, °°0'' bits (indicated by black circles in the figure), are added to the beginning of each 6 bits to form converted data consisting of an 8-bit code string (FIG. 2(C)).

Note that in this embodiment, in order to facilitate the conversion operation,
First, the transfer data is divided into 3 data units (Figure 2 (a)
), these 3 data (24-bit configuration) are divided into 4 bits every 6 bits.
In this case, two "°0" bits are added to the beginning of each 6-bit array (Fig. 2(C)).

That is, in this embodiment, the transfer data is divided into three data units, and these three data are converted into four data. As a result, the code string bit pattern of 1 data of transfer data has 256 combinations of 0016 to FF16, which is converted to 1 data of conversion data having 64 bit pattern combinations of 0016 to 3 F, 6. be done.

Then, code string bit patterns 0016 to 3F16 of each data of the converted data formed in this way are converted to code string bit patterns 2016 to 5F, 6, and code strings that do not match the code string of the transmission control character (transferable code form a column).

This conversion is done from OO16 to 2016 using a conversion table.
0116→2116. ..., 3F, , → 5F16. Next, as described above, if the transfer data is divided into 3 data units and data conversion processing is performed, the transfer data al& may not be a set of 3 data but may be composed of 2 data or 1 data. In that case, data conversion is performed as shown in FIG. 3 or 4. FIG. 3 shows a case where the last data of the transfer data is 2 data. In FIG. 3, two data (1
The 6-bit configuration) is divided into 6 bits, 6 bits, and 4 bits (Fig. 3(b)), with two “0°’s” at the beginning of each.
bits and two “” to the last four bits.
A 0' bit follows (FIG. 3(C)), and the code strings are converted into three 8-bit code strings.

This converted data is then used to form a transferable code string using a conversion table (FIG. 3(d)).

FIG. 4 shows a case where the last data of the transferred data is one data. In FIG. 4, one data of the transfer data shown in FIG. 4(a) is divided into 6 bits and 2 bits.
)), add two "0 pabits" to the beginning of each bit, and add four "0 pabits" to the top two bits (Figure 4(c)) to create a code string 2 of 8 bits. Convert to pieces.

This converted data is then used to form a transferable code string using a conversion table (FIG. 4(d)).

(Effects of the Invention) As described in detail above, according to the data transmission method of the present invention, when transmitting the transfer data to the non-transparent transmission path, each code string of the transfer data is predefined as the code of the transmission control character. Since data conversion processing is performed to convert the data into a transferable code string that does not match the sequence, even if the transfer data is in a back format or a program module, it can be reliably transmitted to the other party in the same data format.

Furthermore, since the conversion operation performed by the first data conversion means of the present invention converts, for example, three data into four data, the transfer data length becomes slightly longer. However, since conversion is performed by adding off-pits, the number of bit pattern combinations in one data code string after conversion is significantly smaller than the number of bit pattern combinations in one data code string before conversion. becomes.

In other words, the probability that converted data will be continuous increases when the same code string is repeated.As is well-known, in this type of data transmission system, it is customary to perform data compression processing to increase transmission efficiency. According to the present invention, compression efficiency is increased, so the length of transferred data can be substantially shortened.
An excellent effect can be obtained in that the transmission efficiency can be further improved compared to the conventional method.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a data transmission system according to an embodiment of the present invention, and FIGS. 2 to 4 are diagrams for explaining data conversion procedures. 1...Computer system, 2...Computer system, 3...Auxiliary storage device, 4...
...Input/output control device, 5...Data conversion means, 6...Compression means, 7...Expansion means, 8...Communication control device , 9...
・Communication path, 10...Communication control device, 11...
. . . Expansion means, 12 . . . Compression means, 13
. . . Data conversion means, 14 . . . Input/output control device, 15 . . . Auxiliary storage device. Agent Yoshihiro Yahata Patent Attorney General fI case explanatory diagram of the day prize Fist 2 figures flit data #4P+=br Theta barley, 廚噸 cQ explanatory diagram half 3 figures

Claims (1)

[Claims] A data transmission method in which communication between information devices having data processing functions is performed via a non-transparent transmission path; the information device serves as a means for forming transmission data to be sent to the non-transparent transmission path; Transfer data consisting of a continuous fixed-length code string of m bits is received, the bit string of the transfer data is divided into at least m/2+i (however, 0<i<m/2) data bits, and the data thus partitioned is m to bit
/2-i off bits are added to form converted data consisting of a continuous m-bit constant length code string, and each code string of the converted data is a transferable code that does not match the code string of the transmission control character. a second data converting means having a first data converting means for converting the data into a column, and a second data converting means for performing a conversion operation opposite to that of the first data converting means on the received data taken in from the non-transparent transmission path; A data transmission method characterized by having the following.