JPH0313039A - Data communication system - Google Patents

Abstract

PURPOSE:To reduce the development man-hour of a transmission/reception application program by decomposing a transmission data into bits, sending them in combination with carrier bits, restoring them at a reception side, thereby attaining the transmission/reception of data easily even when the data kind and the data format differ from each other. CONSTITUTION:The high-order 4-bit of a string capable of communication from a data communication code system is selected and all digit number is set to the high-order 4-bit 21 of a transmission buffer 20 and the high-order 4-bit 31 of a reception buffer 30. When a transmission data is stored in a transmission buffer 10 from a transmission application, the high-order bits 11 of a transmission data are stored in the low-order 4-bit of the transmission buffer 20 and the low-order 4 bits 12 are stored in the low-order 4-bit 32 of the transmission buffer 30. Then the data of the transmission buffers 20, 30 capable of transmission are sent and received by reception buffers 40, 50 respectively. The low-order 4 bits 42, 52 are extracted respectively from the data of the reception buffers 40, 50 at the reception side and stored respectively to the high-order 4-bit 61 and the low-order 4-bit 62 of the reception buffer 60.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data communication system, and particularly to a data communication system that includes data that cannot be transmitted, such as a communication control code.

[Conventional technology]

When performing data communication via an online line, codes that cannot be sent (for example, control codes such as ETX)
However, conventionally, when transmitting with an application program on the user side, the part containing the code that cannot be transmitted is specially converted and then transmitted, and the receiving side converts it on the transmitting side,
Only the parts that were removed are restored to their original state.

[Problem to be solved by the invention]

In the conventional data communication system described above, since the conversion method differs depending on the type of data to be transmitted, there is a problem in that conversion processing routines must be created individually according to the data format.

[Means to solve the problem]

The data communication system of the present invention is characterized by having means for decomposing the transmitted data into dots and converting them all at once into a data format that can be transmitted, and means for returning the received data to the data format of the transmitted data.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

10 are transmission buffers 20 and 30 that store transmission data;
are two transmit buffers that store the converted transmit data, and 40 and 50 are two transmit buffers that store the received data in the converted form.
A receiving buffer 60 is a receiving buffer that reconverts and stores the received data of the receiving buffer 40 and the receiving buffer 50.

First, the upper 4 bits of the communicable column are selected from the data/communication code system, and all digits are set in the upper 4 bits 21 of the transmission buffer 20 and the upper 4 bits 31 of the transmission buffer 30. For example, in the EBCDrC code, this bit is used as a carrier bit from 4 to F.
+161 is possible.

When transmission data is stored in the transmission buffer 10 from a transmission application, the upper bits 11 of the transmission data are stored in the lower 4 bits 22 of the transmission buffer 20. Furthermore, the lower 4 bits 12 of the transmission data are sent to the transmission buffer 3.
It is stored in the lower 4 bits 32 of 0. The data in the send buffers 20 and 30, which can now be sent, is sent, and the data in the receive buffers 40 and 50 are sent, respectively.
will be received.

On the receiving side, the lower 4 bits 42 are extracted from the data in the receive buffer 40 and the upper 4 bits 6 are extracted from the data in the receive buffer 60.
Store in 1. Thereafter, the lower 4 bits 52 are extracted from the data in the reception buffer 50 and stored in the lower 4 bits 62 of the reception buffer 60. The contents of the transmission buffer 10 and the contents of the reception buffer 60 are now the same.

FIG. 2 shows the transmitted data as 40.03, 15. FO(161
It shows the change in the contents of each buffer when the buffer is 4 bytes. In this example, the transport bit is 906. is used.

In the above-described embodiment, the upper 4 bits of the transmission data are first transmitted, and then the lower 4 bits are transmitted, but the transmission order may be reversed, or the transmission may be performed only once.

Further, the bit division method may not be divided into upper and lower bits, but any bit division method may be used. Furthermore, it is also possible to transmit half of the total data first and then the second half of the data.

〔Effect of the invention〕

As explained above, the present invention enables easy transmission and reception of data even if the data types and data formats are different, by decomposing transmission data into bits, transmitting the data in combination with carrier bits, and restoring the data on the receiving side. This is effective in reducing the number of development steps required for transmitting and receiving application programs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing changes in the contents of each buffer in this embodiment. 10.20.30...Transmission buffer, 40.50.
60...Receive buffer.

Claims (1)

[Claims] 1. A data communication system comprising: means for dot-separating transmission data and converting the data into a data format that can be transmitted all at once; and means for returning received data to the data format of the transmission data.