JPH01191542A - Data communication system - Google Patents

Abstract

PURPOSE:To build up system with a host computer and a terminal equipment whose transmission codes differ from each other and to enhance the general-purpose application and the compatibility if the terminal equipment more by differentiating the transmission code used between the host computer and a terminal controller from that used between the terminal controller and the terminal equipment. CONSTITUTION:The terminal controller 6 uses either a 8-unit transmission code or a 7-unit transmission code for the host computer 4 via 1st or 2nd data conversion section to apply data transmission and uses other of either the 8-unit transmission code or the 7-unit transmission code for a terminal equipment 6 to apply data transmission. Thus, the system is built up by using the terminal equipment 6 using the different transmission code from the transmission code used for the host computer 4. Then even the system having not been built up by a conventional technology can be built up and the general-purpose application and the compatibility of the terminal equipment are much improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data communication system in which terminal controllers 1 to 1 are inserted between a host computer and a terminal.

[Prior Art] For example, in a data communication system for financial institutions, a host computer does not directly control a terminal (for example, a teller's terminal), but rather transmits data from the host computer 1 as shown in FIG. is once given to the terminal controller 2, and the terminal controller 2 obtains data instructing an operation mode according to the data and gives it to the terminal 3 for control.

Here, transmission codes in data communication systems have conventionally been fixedly determined by the system, and are the same between the host computer 1 and the terminal controller 2, and between the terminal controller I/roller 2 and the terminal 3. transmission codes were used.

That is, as shown in FIG. 2 (A>), the host computer 1 and the terminal controller 2 are
In a system that uses a 7-unit transmission code in which 7 bits out of 1 byte are assigned to characters according to the JIS standard and the remaining 1 bit is assigned to a parity pit, 7 units are also transmitted between the terminal controller 2 and the terminal 3. It was designed to be transmitted using transmission codes. Also,
As shown in Figure 2 (B), eight units of data are transmitted between the host computer 1 and the terminal/controller 2 by using the character synchronous transmission method or the frame synchronous transmission method, in which each byte is allotted to a character according to the JIS standard. In systems that transmit data using codes, data is transmitted between the terminal controller 2 and the terminal 3 using 8-unit transmission codes.

[Problems to be solved by the invention] Incidentally, in financial institutions, the installation location of terminals may be changed across branches or within a branch due to differences in busy conditions and busy periods between branches. . However, as described above, in the conventional system, the terminal controller 2 and the terminal 3 having different transmission codes cannot be connected, which imposes restrictions on changing the installation position of the terminal 3.

Furthermore, in modern times, systems using 8-unit transmission codes with faster transmission speeds are increasingly being adopted, and there is a tendency to change from the previous system using 7-unit transmission codes. In such a case, the terminal 3 for the 7-unit transmission code may be wasted.

The present invention has been made in consideration of the above points, and aims to provide a data communication system that can be constructed using a host computer and a terminal device with different transmission codes.

[Means for Solving the Problems] In order to solve the problems, in the present invention, a data communication system in which a terminal controller is inserted between a host computer and a terminal device is configured as follows.

That is, the terminal controller includes a first data converter that mutually converts an 8-unit internal code and an 8-unit transmission code;
The present invention includes a second data converter that mutually converts the 8-unit internal code and the 7-unit transmission code. Then, between the host computer and the terminal controller, the above 8
Data transmission is performed using either the unit transmission code or the seven unit transmission codes described above. Also, between the terminal device and the terminal controller, the above 8 unit transmission code or the above 7 unit transmission code is used.
Data transmission is now performed using the other unit transmission code.

[Operation] The terminal controller transmits data to the host computer via the first or second data converter using either an 8-unit transmission code or a 7-unit transmission code, and transmits data to the terminal using either an 8-unit transmission code or a 7-unit transmission code. Data transmission is performed using the other of the 8-unit transmission code or the 7-unit transmission code. Therefore, a system is configured using a terminal device with a transmission code different from that of the host computer.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a data communication system according to an embodiment of the present invention, FIGS. 3 and 4 are flowcharts showing conversion operations between an 8-unit internal code and a 7-unit transmission code,
FIG. 5 is a route map showing a specific example of conversion between an 8-unit internal code and a 7-unit transmission code.

In the embodiment shown in FIG. 1, data is transmitted between the host computer 4 and the terminal controller 5 using an 8-unit transmission code, and between the terminal controller 5 and the terminal 6 using a 7-unit transmission code. It is something.

The terminal controller 5 demodulates one transmission data according to the 8 unit transmission code from the line 7 connected to the host computer 4 via the modem 8 and stores it in the communication control section 9. The communication control unit 9 includes a central processing unit 9a, a program ROM 9b, and a working RAM 9c.
This 8-unit transmission code performs error correction on the transmission data, removes transmission control characters, etc., converts it into data according to the 8-unit internal code, and outputs it to the main control section 10.

The main control section 10 includes a central processing unit 10a, a program RAM 10b, and a working RAM 10c, and executes processing according to data according to the 8-unit internal code. As a result of the processing, when data according to the internal code is to be transmitted to the terminal 6, the data according to the 8-unit internal code is output to the communication control section 9.

The communication control unit 9 converts the incoming data according to the 8-unit internal code into data according to the 7-unit transmission code to which transmission control characters etc. are added according to the procedure shown in FIG. The signal is output, modulated, and output to the four-wire 12.

In the terminal device 6, after converting the data according to the 7-unit transmission code into data according to the 8-unit internal code, it is necessary to execute processing according to this data and output predetermined data as a result of the processing to the terminal controller 5. If this occurs, the data according to the 8-unit internal code is converted into data according to the 7-unit transmission code and output to the line 12.

The terminal controller 5 demodulates data according to the 7-unit transmission code from the line 12 connected to the terminal 6 via the modem 11 and inputs the demodulated data into the communication control section 9 . The communication control section 9 converts the data according to the 7-unit transmission code into data according to the 8-unit internal code by the conversion operation shown in FIG. 4, and outputs the converted data to the main control section 10.

The main control unit 10 executes processing according to the data.

As a result of the processing, when data is to be transmitted to the host computer 4, data according to the 8-unit internal code is output to the communication control section 9. The communication control unit 9 converts the data according to the 8-unit internal code into data according to the 8-unit transmission code by adding a transmission control character, etc., and supplies it to the modem 8, modulates it via the modem 8, and outputs it to the line 7. It is made to be.

Next, a method of converting 8-unit internal code data into 7-unit transmission code data, which is performed by the communication control section 9 of the terminal controller 5, will be explained with reference to FIG.

First, in step 101, it is determined whether the 8th bit of the data to be processed according to the 8-unit internal code is logical "0", that is, whether the data on the shift-in side is the data on the shift-out side (JIS standard). (See C6220). As a result, if a positive result is obtained, the process proceeds to step 102, where it is determined whether there was data to be transmitted immediately before. If it exists, the process advances to step 103 and the immediately preceding 8
It is determined whether the 8th bit of the data according to the unit internal code is logic "0".

As a result of the judgment in step 102, if it is judged that the immediately preceding data does not exist, and as a result of the judgment in step 103, the 8th bit of the data according to the immediately preceding 8-unit internal code is
”, and it is determined that the data is on the shift-out side, the process proceeds to step 104, where the transmission control extended character (D
After adding a shift-in character (SI) and a shift-in character (SI), the process proceeds to step 105, where the 1st to 7th bits of the data are left as they are, and a parity pit corresponding to the contents of the 1st to 7th bits is added to the 8th bit. , and completes the conversion of 1 data according to the 8-unit internal code to data according to the 7-unit transmission code.

On the other hand, if it is determined in step 103 that the 8th bit of the immediately preceding data is logic "0", the process immediately proceeds to step 105 and adds a parity pit according to the contents of bits 1 to 7. The conversion process to data according to the 7-unit transmission code is completed.

Further, if it is determined that the data is on the shift-out side as a result of the determination in step 101 described above, the process proceeds to step 106, where it is determined whether or not there was data to be converted immediately before. As a result, if it is determined that the data exists, the process proceeds to step 107, where it is determined whether the 8th bit of the immediately preceding data was logic "1" or not. If there is no immediately preceding data and a negative result is obtained in step 106, or if the 8th bit of the immediately preceding data is logic "0" and is data on the shift-in side and a negative result is obtained in step 107, the process proceeds to step 108. Proceed to the transmission control extension character (DLE>
and after adding the shift out character (S'O),
Proceeding to step 105, the 1st to 7th bits of the data are left as they are, and a parity pit corresponding to the contents of the 1st to 7th bits is added to the 8th bit, and 7 units are transmitted for the data of 1 according to the 8 unit internal code. Finish the conversion to data according to the sign.

On the other hand, if it is determined in step 107 that the 8th bit of the immediately preceding data is logic "1", the process immediately proceeds to step 105, leaves the 1st to 7th bits as they are, and A parity pit corresponding to the content of is added to the 8th bit, and the conversion process to data according to the 7-unit transmission code is completed.

When the conversion into the data of the 7-unit transmission code is completed in this way, the process proceeds to step 109, where it is determined whether or not the data of the internal code to be transmitted has been completed. If the data exists, the process returns to step 101 described above to proceed to the next data conversion process, and if it does not exist, the program ends in step 110.

Therefore, for example, data Dll and D12 on the shift-in side and data D1 on the shift-out side as shown in FIG.
3, D14, the data string according to the 5-byte 8-unit internal code of data D15 on the shift-in side is data corresponding to the transmission control extension character D21, shift-in character D22, and data Dll as shown in FIG. 5(B). D23,
Data D24 corresponding to data D12, transmission control extension character D25, shift out character D26, data D27 corresponding to data D13, data D28 corresponding to data D14, transmission control extension character D29, shift in character D30, data D15 The received data D31 is converted into a data string in accordance with an 11-byte 7-unit transmission code having a parity pit at the 8th pit I.

Next, a method of converting data according to a 7-unit transmission code to data according to an 8-unit internal code, which is performed by the communication control section 9 of the terminal controller 5, will be explained with reference to FIG. First, in step 121, it is determined whether the target data is a transmission control extended character. If it is determined that it is a transmission control extended character, the next data is extracted in step 122, and in step 123 it is determined whether the data is a shift-in character or a shift-out character. If it is a shift-in character, a flag is set in step 124, and then the next data is extracted in step 125. As a result of the determination in step 123, if it is determined that the character is a shift-out character, step 126
The flag is reset at step 125, and the next data is retrieved at step 125.

When this step 125 is completed, the process proceeds to step 127 and it is determined whether the flag is set. As a result, if the flag is set, the process proceeds to step 128, where the 8th bit is set to logic ``0'', which indicates the shift-in side, while leaving the 1st to 7th bits as they are, to create an 8-unit internal code. The process then outputs the data according to the following and proceeds to step 129.

On the other hand, if the flag is reset, step 130
Step 129, leave the 1st to 7th bits as they are and set the 8th bit to logic ``1'', which indicates the shift-out side, and output it as data according to the 8-unit internal code.
Proceed to.

In step 129, it is determined whether or not the transmitted data has ended, and if it has ended, the program is ended in step 131.

On the other hand, if transmission data remains, step 132
After extracting the next transmission data, the process returns to step 121 described above to process the next transmission data.

Therefore, by executing the program, the data strings D21 to D31 according to the 7-unit transmission code shown in FIG. is converted to

As shown in the above, according to the above embodiment, the terminal controller 5 can transmit data to the host computer 4 using an 8-unit transmission code, and to the terminal 6 using a 7-unit transmission code. By applying this, it is possible to construct systems that could not be constructed in the past.
The versatility and compatibility of the terminal can be further improved.

Note that in the above embodiment, an 8-unit transmission code is used between the host computer and the terminal controller, and a 7-unit transmission code is used between the terminal controller and the terminal, but conversely, A 7 unit transmission code may be used between the host computer and the terminal controller, and an 8 unit transmission code may be used between the terminal controller and the terminal.

Furthermore, the present invention can be applied not only to data communication systems for financial periods but also to data communication systems for other uses.

Further, in the above-described embodiments, the communication control unit converts the internal code and the transmission code in the terminal controller, but the main control unit may also perform the conversion.

[Effects of the Invention] As described above, according to the present invention, the transmission codes are different between the host computer and the terminal controller, and between the terminal controller and the terminal, so that the host computers with different transmission codes can It is possible to construct a system using the terminals and terminals, further increasing the versatility and compatibility of the terminals.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a data communication system according to the present invention, FIG. 2 is a block diagram showing a conventional system, and FIGS. 3 and 4 show an 8-unit internal code and a 7-unit internal code, respectively.
Flowchart showing the conversion method between unit transmission codes, No. 5
The figure is a route map showing an example of conversion between an 8-unit internal code and a 7-unit transmission code. 4... Host computer, 5... Terminal controller, 6... Terminal, 9... Communication control section. Figure 1 Figure 2

Claims (1)

[Claims] In a data communication system in which a terminal controller is inserted between a host computer and a terminal, the terminal controller has a first controller that mutually converts an 8-unit internal code and an 8-unit transmission code. The data conversion section and the above 8
A second unit that mutually converts the unit internal code and the 7 unit transmission code.
A data conversion section is provided, which transmits data to the host computer using either the 8-unit transmission code or the 7-unit transmission code, and transmits data to the terminal using the 8-unit transmission code or the 7-unit transmission code. A data communication system characterized in that data transmission is performed using the other of the 7-unit transmission codes.