JPH0433147A - Data communication device - Google Patents

Abstract

PURPOSE:To retrieve a target user record in a short time by inserting a dummy value next to a transmission equivalent code in a user record and generating transmission data to which a record order number and a terminator are added to the trailing end. CONSTITUTION:A data read means 21 reads data in a size (m) from a reception spool 3 and stores it in a data holding means 22. A transmission code detection/ discrimination means 23 detects and identifies a transmission code from data c1. A collation means 24 judges whether the record order number coincides with a target record number as to all data in the size (m). When they do not coincide, the read means 21 is instructed to read other data in the size (m). When they coincide, a record c2 is read from the holding means 22. The record c2 is processed in the transmission control information removal means 26, a record order number/terminator removal means 27 and a dummy value removal means 28, and the restoration of a user record c5 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data communication device, and more particularly to a data communication device having a transparent functional element in computer communication and the like.

(Prior art) Fig. 6 shows a conventional data communication (for example, computer communication, etc.) that has a function of transparently transferring user records of unspecified size and arbitrary codes using transparent codes.
A schematic diagram of the device is shown.

In the figure, reference numeral 1 denotes a data transmitting device consisting of, for example, a host computer, 2 a data receiving device, and 3 a receiving spool.

The data transmitting device 1 forms a data format as shown in FIG. 7, for example, and transmits it to the line. The data format consists of a plurality of records, and each record includes transparency control information consisting of a transparency code (TRN), a data length (n) indicating the scope of transparency, a user record consisting of a code, and a record sequence number (NO ). As a specific example, the transparent code (TRN)
is represented by the data "35".

When the data receiving device 2 receives the data using the data formatter, it stores it in the receiving spool 3 in the same state.

After the received data is stored in the reception spool 3, when searching for a target user record, read the record sequence number immediately before the next record from the transparent code and data length at the beginning of the received data, Determine whether this matches the number of the target user record, and if it does not match, detect the next transparent code and data length,
Furthermore, the record sequence number immediately before the next record is read and verified. This operation is repeated until the target user record is detected.

(Problem to be Solved by the Invention) In conventional data communication devices, the search for specified user records is performed sequentially from the beginning of received data as described above, so it is difficult to detect a user record with a large record sequence number. The problem was that it took a long time.

The reason why it is necessary to search from the beginning of the received data, rather than from the middle of the received data, is as follows.

Now, it is assumed that received data having the contents as shown in FIG. 7 is stored in the reception spool 3, and a user record with record order number "8", for example, is searched from this received data. At this time, as shown in FIG. 8, for example, r is in the user record of the fifth record.
There is a code 35J, and the code of the next byte is n2
Then, the code after (n2-1) byte data length happens to be "8", and furthermore, the search for the record sequence number "8" results in, for example, the code P (in the fifth user record). (see Figure 8), the code "35" in the user record is mistakenly recognized as a transparent code, and the code that follows is the record sequence number "35".
8" will be erroneously detected as a user record.

If the search is started from the beginning of the received data, the code "35" in the fifth user record will not be mistaken as a transparent code, so it is clear that the false detection can be prevented.

The purpose of the present invention is to eliminate the problems of the prior art described above,
It is an object of the present invention to provide a data communication device that can quickly detect a target user record from any position in received data and can start processing (for example, printing) from the record at an early stage.

(Means and operations for solving the problem of thick layers) In order to achieve the above object, the invention of claim (1) transparently transfers a user record of unspecified size and having an arbitrary code using a transparent code. In a data communication device having this function, a detection means for detecting a transparent equivalent code in a user record, an addition means for adding a dummy value when the transparent equivalent code is detected, and a record sequence number and a terminator are added to the end of the user record. It is characterized by having a means to do so.

According to this invention, the transparent equivalent code detection means detects the same code as the transparent code (transparent equivalent code) from the user record. When the transparent equivalent code is detected, the dummy value adding means inserts a dummy value into the next byte of the transparent equivalent code. Furthermore, a record sequence number and a terminator are added to the end of the user record to form transmission data.

The invention according to claim (2) includes means for reading data of a predetermined size from the accumulated received data, detecting a transparent code from the data of the predetermined size, and detecting a terminator and a record sequence number based on the transparent code. The present invention is characterized in that it includes means for searching for a target record, and means for removing the transparent code, record sequence number, terminator, and dummy value from the target record to restore the user record.

According to this invention, data of a predetermined size is read out from the accumulated received data, a transparent code is detected from the data, a terminator and a record sequence number are detected based on the transparent code, and the record sequence number and purpose are detected. The target user record is detected by comparing the record order number of the user record.

Therefore, there is no need to start searching for the target user record from the beginning of the received data, and the search for the target user record can be performed in a short time.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 1(a) shows a functional block diagram of an embodiment of a data transmitting device of the present invention, and FIG. 1(b) shows a functional block diagram of an embodiment of a data receiving device. In addition, FIG. 2(a) is a conceptual diagram of the record assembly process by the data transmitting device, and FIG.
b) is a conceptual diagram of target record detection processing and record restoration processing by the data receiving device.

The functions of the pig transmitter will be explained with reference to FIG. 1(a) and FIG. 2(a).

The transmission data receiving means 11 receives a user record b1 as shown in FIG. 2(a).

TRN- in the user record bl indicates a transparent equivalent code, specifically a code of "35".

Note that the above user record b1 is an example of a case where the transparent equivalent code TRN- is included therein, and it goes without saying that there is a case where the transparent equivalent code TRN- is not included.

The transparent equivalent code detecting means 12 detects whether or not the transparent equivalent code TRN- is present in the user record b1, and if so, activates the dummy value adding means 13. For this reason, the dummy value addition means 13 uses the transparent equivalent code TRN-
A dummy value n- is added afterwards. Specifically, this dummy value n- is data of "0". As a result, the user record output from the dummy value adding means 13 becomes b2.

Next, when the end detecting means 14 detects the end of the user record b1, the record sequence number and terminator adding means 15 is activated. This adding means 15 adds a record sequence number NO and a terminator t to the end of the user record b1.

As a result, the user record output from the adding means 15 becomes b3.

As described above, the user record with the dummy value n' added after the transparent equivalent code TRN- and the record sequence number NO and terminator t added at the end is sent to the transmission data assembling means 16. The transmission data assembling means 16 adds a transparent code TRN and a data length indicating a transparent target range to the head of the user record.

When the record b4 is formed as described above, the record b4 is transmitted to the receiving computer via, for example, a dedicated line of the computer.

The receiving side computer is equipped with the receiving spool 3, and receives the received data C as shown in FIG. 1(b).
Accumulate. The received data C is accumulated in units of size m (bytes), for example.

Next, on the receiving side, the operation of searching for a user record with a required record sequence number (hereinafter referred to as a target record) from among the received data is shown in FIGS. 1(b) and 2.
This will be explained with reference to Figure (b).

First, target record detection processing is performed.

The data reading means 21 reads data of size m from the reception spool 3 and stores it in the data holding means 22. Therefore, the data holding means 22 holds the data CI shown in FIG. 2(b).

The transparent code detection/discrimination means 23 detects a code "35j" which is a transparent code or a transparent equivalent code from the data CI, and identifies whether it is a transparent code or a transparent equivalent code. This can be determined based on whether the byte following "35" is a dummy value of "0". If it is a transparent code, the terminator t is detected based on the next data length l, and the record sequence number NO in the previous byte is determined.

The collating means 24 determines whether or not the record sequence number NO and the target record number 25 match for all of the data of size m, and if they do not match, the data reading means 21 sends other data of size m to the data reading means 21. Instruct to read out. On the other hand, if they match, the data holding means 2
Read record c2 from 2.

Note that since it is usually possible to predict whether the target record belongs to the data of size m, the search for the target record can be completed by reading data for -degrees.

This record C2 is sent to the transparency control information removal means 26. The transparency control information removing means 26 extracts from the record c2 the transparency code TRN which is the transparency control information and the data length indicating the transparency target range! and is sent to the record sequence number/terminator removal means 27. The removing means 27 removes the record sequence number NO and the terminator t from the user record C3 to create a user record C4. The user record C4 is sent to the dummy value removing means 28, and the removing means 2
8, the dummy values are removed. In this way,
Restoration of user record c5 (or bl) is completed.

As a result of the above processing, the target user record can be detected quickly, and processing such as printing can be started.

FIG. 3 is a flowchart of the record assembly process of the data transmitting apparatus, and FIGS. 4 and 5 are flowcharts of the target record detection process and record restoration process of the data receiving apparatus.

The contents of this flowchart are almost the same as those already explained above, so the explanation will be omitted.

(Effects of the Invention) As is clear from the above description, according to the present invention, it is possible to search for a target record not from the beginning of the received data but from any position, so the target record can be searched quickly. It has the effect of being able to

Moreover, as a result, there is an effect that processing of the record can be started quickly.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of FIG. 1, FIG. 3 is a flowchart of record assembly processing, FIG. 4 is a flowchart of target record detection processing, and FIG. The figure is a flowchart of the record restoration process.
FIG. 6 is a block diagram showing the general hardware configuration of the data communication device of the present invention, and FIGS. 7 and 8 are diagrams showing the format of transmission data. Output means, 15... Record sequence number/terminator addition means, 21... Data reading means, 22... Data holding means, 23... Transparent code detection/discrimination means, 24.
...Verification means, 26...Transmission control information removal means, 27
...Record sequence number/terminator removal means, 28
...Dummy value removal means, agent Patent attorney Michito Hiraki
1 person outside 1...Data transmitting device, 2...Data receiving device, 3...
... Reception spool, 12... Transparent equivalent code detection means, 13... Dummy value addition means, 14... End detection Fig. (a) Fig. Fig. (a) Fig. (b) Fig.

Claims (2)

[Claims] (1) In a data communication device having a function of transparently transferring a user record of unspecified size and having an arbitrary code using a transparent code, a detection means for detecting a transparent equivalent code in the user record, and the transparent equivalent code. It is equipped with an adding means for adding a dummy value at the time of detection, and a means for adding a record sequence number and a terminator to the end of the user record, inserting the dummy value next to the transparent equivalent code in the user record, and adding the dummy value to the end A data communication device characterized in that transmission data is created with a record sequence number and a terminator added. (2) In a data communication device having a function of transparently transferring a user record of unspecified size and having an arbitrary code using a transparent code, means for reading data of a predetermined size from the accumulated received data; means for determining a transparent equivalent code and a transparent code based on the presence or absence of a dummy value from data of a predetermined size, detecting a terminator and a record sequence number based on the detected transparent code, and searching for a target record; A data communication device comprising means for removing the transparent code, record sequence number, terminator, and dummy value from the data to restore the user record.