JPH0451848B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] When code data generated when operating a keyboard is sent to another location for information exchange, when the shift key is operated to save the number of keys on the keyboard used, when the code data is transmitted due to an erroneous operation, etc. This is an information exchange code data transmission method in which unnecessary key data is not transmitted.

[Industrial Application Field] The present invention relates to an information exchange code data transmission system that eliminates unnecessary data transmission when transmitting code data when a keyboard is operated, and performs efficient transmission.

[Prior Art] When operating a keyboard such as a captain system and transmitting data to another location, specific code keys or shift keys are used to reduce the number of keyboard keys and data bits. For example, the third
In the code structure specified in JIS C6220 shown in the figure, SO (shift out side) is placed in column 0, rows 14 and 15.
The shift key and code for SI (shift-in side) are defined. The code when operating the key SO is
0111000, the code when operating the key SI is
It is 1111000. Therefore, each column key of columns 2 to 7 can transmit different data contents depending on the previously operated SO or SI key.

For example, if you press the key SO and then press "A" in the 3rd column and 1st row, 0111000 1000110 will be sent. The receiving side looks at the original code and receives 1000110 as "A" because it is data from the shift-out side.

If you operate 3 columns and 1 row following key SI, the receiving side will judge that the data is on the shift-in side, so it can receive 1000110 as "1".

[Problems to be Solved by the Invention] In the conventional data transmission method, when a keyboard is operated, the predetermined code data is always transmitted. Therefore, when operating the shift key to send katakana after SI "A", "B", and "C", the SI
Sometimes I forget to change the SO and then try again. At that time, if you operate as SO SI SO "a" and "i", all the data will be sent to the transmission line. Therefore, on the receiving side, the shift key receiving circuit operates many times.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data transmission system in which unnecessary code data is not transmitted in order to improve the above-mentioned drawbacks.

[Means for Solving the Problems] Fig. 1 is a diagram showing the principle configuration of the present invention, in which 1 is a keyboard, 2 is a data transmission control device, 3 is a modem, 4 is a transmission line, and 5 is an optical coupling device. A signal coupling device such as the one shown in FIG. In the data transmission control device 2, 21 is a microprocessor, 22 is a program storage memory, 23 is a data memory containing shift data, 24 is a line control device, and 25 is a keyboard control circuit.

In the data memory 23, 23-1 is the first memory, 23-2 is the second memory, and both bit storage locations B1 and B indicate that a specific shift key has been operated.
It has 2. The program storage memory 22 also stores programs for the microprocessor 1 to execute processing when a specific shift key on the keyboard is operated, as will be described later. Therefore, when the shift key is operated, the first memory 2
3-1, the means for storing the data in the predetermined location B1, the means for determining the operation of the shift key and the code key, and the means for transmitting the code, and the means for transmitting the code data when the code keys are operated one after another are stored as a program. ing.

[Function] When the keyboard 1 is operated in Fig. 1,
The keyboard control circuit 25 is the microprocessor 1
The code data is obtained under the control of When a specific shift key is operated, a bit indicating this is stored in the first memory 23-1. After that, when the code key is operated, the bit corresponding to the immediately previous code key is sent together with the code key data. The data is then transmitted to a predetermined location via the transmission line 4 via the line control device 24 and the modem 3.

[Embodiment] FIG. 2 shows an operation flowchart for the microprocessor shown in FIG. Figure 2A shows a specific shift key.Here, when the SI or SO key is operated, Figure 2B shows the specific shift key after operating the SI or SO key.
This shows the case when the code key is operated.

In FIG. 2A, when the SI or SO key is operated (step), the microprocessor detects this and stores "0" in the bit storage location B1 of the first memory in the step.
, "1" is stored when the SO key is pressed. Other locations in the first memory 23-1 may be all "0".
During this storage, the SI key code and SO key code are not sent from the modem 3. In FIG. 2B, when a code key or the like is operated (step), the microprocessor 21
The stored bit B1 of the shift key bit of the memory 23-1 is compared with the stored bit B2 of the two memories 23-2. Since nothing is stored in the second memory 23-2, first memory B1 = second memory B2
The judgment is negative, and the data of the operated code key is transmitted in the mode corresponding to the key just operated (step). In other words, the shift key bit is transmitted as data immediately before the data of the operated code key. , only the shift key code is not transmitted multiple times. The bit B1 stored in the first memory 23-1 is transferred to the second memory 23-2 and rewritten (step).

If the shift key is initially operated twice in succession, the initial code is stored in the first memory 23-1 according to FIG. 2A, and when the next operation is performed, the second code is stored.
The initial code is transferred to the memory 23-2 and the first
The new code is stored in memory. Therefore, when pressing a key other than the next shift code, the first
Compare the bits stored in the memory and the second memory. If they are the same, the mode corresponding to the shift key operated last in the step, that is, the code stored in the first memory and the data resulting from the key operation are sent out. If they are different, the code corresponding to the code key and the mode code corresponding to the shift key operated last are transmitted. Subsequently, the bits stored in the second memory are rewritten as described above. At this time, the shift key code is not transmitted multiple times. In the above explanation, the SI and SO keys were used as specific shift keys, but if a set is made up of other function keys, they can be handled in the same way.

[Effects of the Invention] In this manner, according to the present invention, unnecessary code data will not be transmitted even when an erroneous operation or an operation to confirm just in case is performed. Therefore, the receiving side does not perform any unnecessary operations.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention, FIG. 2 is an operational flowchart for the microprocessor shown in FIG. 1, and FIG. 3 is a diagram showing the code structure specified by JIS. DESCRIPTION OF SYMBOLS 1... Keyboard, 2... Data transmission control device, 4... Transmission circuit, 21... Microprocessor, 23-1... First memory, 23-2... Second
Memory, B1, B2...Bit storage locations.

Claims (1)

[Claims] 1. In an information exchange code data transmission method in which predetermined code data is transmitted when a code key is operated after pressing down a function key, a first memory 23-1 and a second memory having bit storage locations B1 and B2 are provided. A memory 23-2 is provided, and means for storing a bit indicating that a specific shift key has been operated in a predetermined location B1 of the first memory 23-1, and for immediately transmitting data corresponding to the specific shift key when the specific shift key is operated. means for transmitting the code data of the immediately preceding shift key/bit along with the code data for a code key operated immediately after a specific shift key operation, and means for transmitting code data one after another in the case of successive code key operations. An information exchange code data transmission system characterized by comprising: