JPH03174836A - Data transmission method - Google Patents

Abstract

PURPOSE:To use an unreliable code (one of codes not in use especially allocated in a transmission code table) in common even in the communication between different kinds of equipments by allocating one of codes not in use as an unreli able code, adding the code before or after a data code, transmitting the result and allowing a data receiver side to detect that the data is unreliable. CONSTITUTION:Data transmission is implemented via a transmission line 5 between a transmission side computer 1 and a reception side computer 2. When an unreliable data D2 is present thereon in a transmission data 3 outputted from a transmission section 7 in the transmission side computer 1, an unreliable code allocated to one of codes in use in a transmission code table in advance is added before or after the transmission data 3, and when the reception side computer 2 receives the transmission data 3, the presence of the unreliable code is detected and stored as a reception data 4 and transmitted. Thus, the unreliable code in the communication between different kinds of equipments is used in common and the handleability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission method for unreliable data in information communication technology.

[Conventional technology]

Traditionally, data with errors (hereinafter referred to as unreliable data)
As a method of expressing this, unique rules are established for each target device.

Specifically, as shown in FIG. 6, for example, the least significant bit of the mantissa part of floating data is used, and if a bit is set there, appropriate processing is performed as unreliable data.

In other words, if the least significant bit of the mantissa becomes "1", all subsequent calculation results will have the least significant bit set to "1".
'', untrusted data is inherited.

[Problem to be solved by the invention]

Conventional data transmission methods are bottom-lined as described above, and rules are set individually depending on the target device.
The main problem with communication codes such as EBCDIC code, ASCII code, etc. is that it is very inconvenient to uniformly communicate the reliability of data.

This invention was made to solve the above-mentioned problems, and by creating a new untrusted code that can be commonly used in communication between different types of devices, it is possible to simultaneously transmit reliable data along with transmitted data. The purpose is to obtain a data transmission method.

[Means to solve the problem]

In the data transmission method according to the present invention, when unreliable data exists in the transmission data output from the sending computer, an unreliable code assigned in advance to one of the unused codes in the transmission code table is placed before or before the transmission data. It is added later, and when the receiving computer receives the transmitted data, it detects the presence or absence of the untrusted code.

[For production]

The unreliable code in this invention is assigned one of the unused codes in the transmission code table as an unreliable code, and is added before or after the data code and transmitted, so that the data receiving device side can detect that the data is unreliable. Make it detectable. Then, the untrusted code can be stored as is or transmitted to other receiving devices.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Third
In figure (a), 1 is a sending computer, 2 is a receiving computer, 3 is transmission data including unreliable data D, 4 is received data transmitted to the receiving computer 2, and 5 is a communication network. 6 is the data being transmitted.

Next, the operation will be explained with reference to the flowchart in FIG. First of all, FIG. 1 is a table of ASC ■1 codes currently used as is well known. As shown in FIG. 2, an unreliable code "OR" is assigned to the unused code section of this ASCII code table, address "7F". Therefore, when data is transmitted via the transmission path 5 between the sending computer 1 and the receiving computer 2 as shown in FIG. (step 5TI), then the transmitter 7 transmits the data D2
Add unreliable code “OR” to (Step 5T2)
On the data transmission path 5, the data 6 being transmitted is transmitted with the contents shown in the figure (step 5T3), and the data "D!" is added with an unreliable code "OR" and stored as received data 4. 2 confirms this and learns that D8 is unreliable data (step 5T4).

In Figure 4, unreliable information is transmitted one after another on the communication network in this way, and Figure 5 conceptually shows how the unreliable information is transmitted. In Figure 0, l is Sending computer that generated untrusted data, 2.1
is the receiving computer that received the data, and 2.2 is the second receiving computer that received the unreliable data from the receiving computer 2.1.

Next, the operation of adding an unreliable code will be explained with reference to FIG. 3(b). In transmission data 3, data D,...
D, , D, · When only data "Dz" of D is transmitted as unreliable data, the codes other than data "Dt" are converted and transmitted as they are.

Regarding the data "Dt", an unreliable code "IIR" is added after the data and transmitted as shown in FIG. 3(b).

If the receiving computer 2 stores the data with the unreliable code "OR" attached, the unreliable information will remain unchanged even if the data is transmitted to another receiving computer 2.2, as shown in Figure 5. They will be transmitted one after another.

Note that although the above embodiment has been explained using the ASCII code as a model, other codes such as EBCDIC code,
It may be another code such as a JIS code, or an unreliable code may be added before the data. It goes without saying that the untrusted code can be assigned anywhere on an unused code.

〔Effect of the invention〕

As described above, according to the present invention, when unreliable data is present in transmission data output from a sending computer, an unreliable code assigned to an unused code is added to the transmission data, and the transmission data is transmitted to the receiving computer. Since the presence or absence of an untrusted code is detected when the computer receives the data, it is very convenient to be able to use the untrusted code in common even in communication between different types of devices, and the reliability of the data exchanged over the communication network can always be grasped. , there are effects that can be checked.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the current ASCII code table, and Figure 2 is an AS to which untrusted codes are assigned according to an embodiment of the present invention.
FIG. 3(a) is an explanatory diagram of the CII code table, FIG. 3(a) is an explanatory diagram of unreliable data transmission according to an embodiment of the present invention, FIG. Diagram (a)
FIG. 5 is an explanatory diagram of a network for unreliable data transmission according to the present invention, and FIG. 6 is an explanatory diagram of a conventional unreliable data representation method. In the figure, l is the sending computer, 2 is the receiving computer, and 3 is the sending computer.
4 is transmission data, 4 is reception data, 5 is a transmission path, 6 is data being transmitted, and 7 is a transmitter. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a data transmission method that performs data communication between multiple computers of the same model or different models via a transmission path, if unreliable data exists in the transmission data output from the transmitter by the sending computer, An unreliable code assigned to one of the unused codes in the transmission code table is added before or after the transmitted data, and when the receiving computer receives the transmitted data, it detects the presence or absence of the unreliable code and updates the received data. A data transmission method characterized by storing or transmitting data as follows.