JPS62131645A - Data communication equipment - Google Patents

Abstract

PURPOSE:To discriminate a code for mode switching even when a discrimination code is not included in an escape sequence data or the like by discriminating whether a special character string is transmitted at high speed or not and deciding whether or not an instruction is a mode switching instruction. CONSTITUTION:In applying mode switching, a mode switching key is depressed and a special character string for switching to each mode is fed to a reception buffer at specific speed. On the other hand, when the state sending the same character string as that of the mode switching is generated during the operation not being the object of mode switching, the similar character string is fed to the reception buffer. In this case, since an operation time exists between the special character inputted by the key operation of the operator and characters by an escape key (ESC) and its succeeding key operation, a timer 2 discriminates the specified value. Even when the special key is depressed as the character data, it is discriminated that the key depression is not for the mode switching through the former discrimination. Thus, whether or not the special character for the mode switching is discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a data communication system, and particularly to a data communication device that performs one-ill communication using an escape sequence.

[Traditional technique]

With the development of microprocessors and the like, data has become increasingly transmitted between devices. Nowadays, not only codes representing alphanumeric characters are transmitted, but also JIS
In some cases, the kanji code specified by ζ is sent.

In general, Kanji codes consist of 2 bytes, and alphanumeric codes, for example, consist of 1 byte. The 2-byte kanji code includes alphanumeric characters and special symbols, but in transmission between computers and between computers and terminals, kanji codes are also sent and received in addition to the alphanumeric code transmission described above. It is now hoped that this will be possible. Most systems that can handle kanji codes have a function to switch between kanji mode and alphanumeric mode, and after transmitting sequence data of a specific code between transmitting and receiving devices and switching the mode, the kanji code is transmitted. The sequence data (generally escape sequence data is used).

) After that, the device that receives the data processes the received data as Kanji code data. By switching this mode, alphanumeric characters can be transmitted in 1 byte, and Kanji characters can be transmitted in 2 bytes, allowing high-speed data transmission in systems where alphanumeric characters and Kanji characters coexist. Additionally, in systems where the O3 (operating system) operates using only alphanumeric characters, and Kanji codes can be handled by running programs under the control of the O8,
When the above-mentioned program is executed, the mode of the computer or terminal device is changed. Escape sequences etc. are used to change this mode. However, there is a problem in that when transmitting binary data, alphanumeric code data, etc., if the above-mentioned specific code for mode switching has to be transmitted by chance, the transmission cannot be performed.

This is because if you send a specific code for mode switching, that is, an escape sequence, even though that code is the data you want to transmit, the receiving device will assume that it has received escape sequence data and switch the mode. This is because it was For this reason, even though the data sent thereafter was, for example, alphanumeric code data, it was received as Kanji code data.

In order to solve this problem of mode switching, the conventional method is to add a code for mode switching, that is, a code that determines whether a special character string or normal alphanumeric characters are being transmitted. is used. With this method, communication between computers is performed normally. However, when transmitting data between a computer and a terminal device, etc., a code has to be added by an operator's key operation to determine whether the code is for mode switching or not. In this case, in addition to the problem that the operator must perform operations corresponding to the added code, there is also the problem that the operator must always be aware of whether or not the mode is to be switched. Was.

[Purpose of the invention]

In view of the above-mentioned problems, the present invention provides a transmission system that includes a specific code representing mode switching, etc. Even if the specific code, that is, escape sequence data, etc. does not include a discrimination code, the specific code is the data to be received or the mode It is an object of the present invention to provide a data communication device that determines whether the code is for switching and receives the code.

[Key points of the invention]

In order to achieve the above object, the present invention includes a receiving means for receiving data, a first determining means for determining whether data manually input from the receiving means is first specific data, and the determining means. a second determining means for determining whether at least one piece of data subsequent to the first specific data is the second specific data within a specific time from when it is determined that the data is the first specific data; It is characterized by comprising a mode switching means for switching the mode of the receiving means when the second determining means determines that the data is the second specific data.

And its action is as follows.

The first determining means determines whether the data received by the receiving means for receiving data is the first specific data. If it is the first specific data, the second specific data determines whether or not the second specific data has been received within a specific time.
The mode of the receiving means is switched when the second determining means determines that the data is the second specific data within a specific time.

〔Example〕

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a circuit diagram of an embodiment of the present invention.

Although not shown, a terminal device operated by an operator is connected to the communication line 4. Then, the code data generated by the operation of the terminal device is added to the reception BUFFER 3 via the communication line 4.

The reception BUFFER 3 is, for example, a circuit that converts serial data applied from the communication line 4 into parallel data and outputs it to the processor circuit (CPU) 1.

The processor 1 includes a state information memory 5. A special character string temporary storage memory 6, a special character string comparison information memory 7, and a received data memory 8 are connected. The embodiment of the present invention has a kanji mode and a normal mode. The kanji mode is a mode in which the received data is treated as a kanji code and processed after reception in 2-byte units, and the normal mode is a mode in which the received data is treated as an alphanumeric code and processed after reception.

This mode is switched in response to data (escape sequence data) from an external device, and its state is stored in the kanji mode flag KF of the status information memory 5. on the other hand,
This device internally determines whether the data for mode switching described above, ie, the special character string, is being received. While receiving a special character string, the special character string TF is turned on based on this determination, and the special character string is processed. This process involves successively receiving data from the processor 1 via the reception BUFFER 3.
When the special character string representing the above-mentioned mode switching or normal character mode switching is received, the data added to the
Switch the mode by turning F on or off. A special character string comparison information memo I77 stores special character strings for comparison. The special character string temporary storage memory 6 temporarily stores the special character string being received in 1-byte units when the special character string medium flag TF is on.

For example, when the special character string for switching kanji mode is changed, the first character string is "ESC" and the second character string is "A".

Next, "B" is sequentially stored in the special character string temporary storage memory. Further, when it is determined that the special character string is not a special character string for switching to the above-mentioned kanji mode or normal character mode while receiving the special character string, the contents of the special character string temporary storage memory 6 are stored in the received data memory 8.

The terminal device (not shown) connected to the communication circuit [4] is operated by an operator, and for example, when switching modes, a specific key, that is, a mode switching key is pressed. When this key is pressed, a special character string for switching to each mode is added to the receive buffer of the embodiment of the present invention at a specific speed (determined by the baud rate of the communication line, etc.). On the other hand, if a situation occurs in which the same character string as that for mode switching occurs during an operation not intended for mode switching, the same character string is added to the reception buffer. The difference between these two cases is that the code is added at different speeds, for example in bytes. In other words, when a mode switching key is pressed, a special character string is automatically generated and added to the buffer at a specific speed, but data with the same code as the special character string generated by the operator's operation is added slowly in each byte. added. A feature of the present invention is that the speed of this added data is determined to determine whether or not even the same character string is a character string for mode switching.

To make this determination, a timer (Timer) is used to measure time.
) 2 is connected to the processor.

FIG. 2 is an operational flowchart of the embodiment of the present invention.

Below, using each memory mentioned above, the reception BUFFER3
The following describes in detail what processing the processor 1 executes on the data received and how the mode is switched.

When the embodiment of the present invention starts its operation S0, it first performs S1 to determine whether there is a -9=received character. Operation start S0
In the case where there is no received character, if No, it is determined whether or not the timer 2 is at the specified value in step S25.

The timer 2 measures time from the time it is activated in a process to be described later, and the timer 2 is not activated immediately after the start of operation S0. As a result, the timer 2 does not reach the specified value (NO), and the process of determining whether or not there is a received character is executed again from step S1. This operation is repeated until data is sequentially received and the character code is stored in the reception BUFFEH. Then, when it is stored in the reception BUFFER 3 via the communication line 4 from a terminal device (not shown), it is detected as present in the determination process S1 (YES), and the reception BUFF
A process S2 for reading characters from FER3 is performed. Then, determination processing S3 whether the current mode is in a special character string or not
I do. When the character string is not in the special character string, a determination process S17 is performed to determine whether the next received character is the first character of the special character string.

In this determination process 317, it is not a special character string (No)
Sometimes, a determination process S22 is performed to determine whether the current mode is the kanji mode. If it is in the kanji mode (YES) in this determination process S22, a process S23 is performed to convert the received characters into kanji codes. This process S23 is
For example, if the data to be received is an associative character input, etc.
This is the process of converting the human-written kana characters into kanji codes in the embodiment of the present invention. In addition, the direct kanji code is 1
This process is not necessary when inputting in bytes. Then, the converted characters are stored in the received data memory 8. Process 32 for determining whether or not the kanji mode is in progress as described above.
If the kanji mode is not in step 2 (No), a process 324 is performed in which the received data is stored in the received data memory 8. Through this process, the received data in each mode is stored in the received data memory 8. The process 322 for determining whether or not the kanji mode is in effect is performed depending on whether the SORAG KF in the kanji mode shown in FIG. 1 is on or off. FIG. 3 is a memory content diagram showing how data is stored in each memory when data is received during the normal character mode. At the start of operation (Fig. 3 (1)), each memory 5, 6.8 and reception BU
Nothing is stored in FFER3. At this time, the flag is also off, and the mode is normal character mode.
Furthermore, it is specified that it is not in a special character string. and reception B
Data “A” has been added to UFFER3 (Figure 3 (2)
) After that, as mentioned above, the discrimination processing Sl, S17, 322
is performed, and processing S24 is executed. As a result, A'' is stored in the received data memory 8.Furthermore, 'B
”.

When "C" is added, "B" and "C" are stored in the received data memory 8 as shown in FIG. 3 (4).

On the other hand, if the received data, that is, the character, is the beginning of the special character string in the determination process 317 (YES), a process S19 is performed in which the received character is stored in the special character string temporary storage memory 6.

Then, the special character string flip-flop TF is turned on to enter the special character string (S20), and the timer 2 is activated (321). When a character is inputted next time through this process 520, the next process S4 determined by the process S3 for determining whether or not it is in a special character string is performed. However, before this character is input, the determination process Sl, S25
is repeated, for example, there is an operation time between the special character escape key (ESC) input by the operator's key operation and the character input by the subsequent key operation. (YES). At this time, a process S26 is performed to stop the time counting operation of the timer 2, and a process S27 is performed to turn off the special character string medium flag TF.
I do. Through this determination process S25, even if the first character of the special character string is added, it is determined that the special character string has a specific time and is not a mode change in the special character string. Even if a special character is pressed by a key operation by the operator, this judgment determines that the special key was pressed as character data and not for mode switching, so the special character string is The process of storing the character data stored in the temporary storage memory in the received data memory 8 -13=32B is performed, and the process of determining whether or not there is a received character is performed again.

For example, when the mode switching key of a terminal device is pressed by an operator to generate a special character string, special characters are generated consecutively, so the specified character string is determined by determining whether or not the above-mentioned timer 2 is at the specified value. Since it is not detected as a value and a character is input before it, it is determined to be a received character string in the discrimination process S1, and the next discrimination process S3. is executed. When the mode switching key is pressed and the special character of the escape sequence for switching the mode is detected, the character is found to be in the special character string (Y
ES). At this time, the process S4 continues to store the received characters in the special character string temporary storage memory 6.
I do. Since an escape sequence is not made up of one character but multiple characters, it is a series of special characters that determines whether it is a special character string for mode switching or something different. 14- As the column becomes clear when it is entered, it is necessary to remember the data received so far.

This temporary storage is a special character string temporary storage memory. After performing the process S4 of storing characters in the special character string temporary storage memory, the data for each mode switching stored in the special character string comparison information memory 7 and the input characters, that is, the special character string temporary storage memory 6, are Compare the contents. If they do not match (No), the timer 2 is stopped (S6) and the special character string medium flag TF is turned off (S7). If the comparison does not match, the subsequent comparison will be meaningless even if it is in the middle of the string data, so at this point, turn off the special string middle flag and receive the character as is in the current mode. . Then, similar to process 328, process S8 is performed to store the data stored in the special character temporary storage memory 6 and the received data memory.

Further, when it is determined in the above-described determination process S5 that they match, it is then determined whether or not the data being received has reached the number of characters of the special character string. In the above-mentioned determination processing S5, it is simply determined whether or not the number of input characters matches, so even if the characters are in the middle of the string, if the comparison of characters up to that point matches, YES is returned. Become. Therefore, by determining whether or not the number of characters being received has reached the prescribed number of characters of the special character string (S9), it is possible to determine whether or not a series of special character strings have been received.

If the number of characters is not a specific number, it is determined by the characters that follow, so the mode is not switched at this point, and the timer 2 is restarted 316. Also, discrimination S9
When there is a match (YF, S), this special character string matches the data stored in the special character string comparison information memo +J7, so mode switching is performed in subsequent processing. First, the timer 2 is stopped (S10), and the special character TF is turned off (Sll). Since a series of special character strings have been received and are determined to be special character strings, this process S10. S11 is performed. After this process, the special character string temporary storage memory 6
Clear the contents of S12. At that point, only a special character, that is, an escape sequence for mode switching has been detected, so next a determination process S13 is performed to determine whether or not a special character string for kanji mode switching has been detected. When the kanji mode has been switched (YES>, the process S14 to enter the kanji mode, that is, the process of turning on the kanji mode flag KI?) is performed. When the kanji mode has not been switched (NO), the normal character Since it is a mode switch (
In the embodiment of the present invention, Kanji mode switching ESC", "A
”, B”2 Normal character mode switching ESC”, “C”,
(There are only two types, D''), a process S15 for eliminating the kanji mode flag, that is, a process for turning off the kanji mode flag KF, is performed.

The above-mentioned process S8. S14. S15. S16°S21.
After S24.328 is executed, all determination processing S1 is performed, so data received at one character position is always determined, and after receiving the special character "ESC", the following character is a character of a special character string. It is possible to determine whether there is one or not, and also to detect the time at which each character is received. In particular, it is possible to distinguish between a special character string caused by a coincidence caused by an operator's operation and a special character string caused by a mode switching key based on the time at which the character string is received.

Figures 4 and 5 show cases where mode switching is performed,
FIG. 7 is a memory content diagram showing a case where data is received without mode switching; FIG. A to receive data memory 8
, B, and C are stored, the character “ESC” is received in the BU
When entering FFER3 (Fig. 4 (1)), the special character string flag in the status information memory 4 is turned on, and the received BU
The contents of FFER3, ie, “ESC” are stored in special character string temporary storage memory 6. And then “A”.

After "B" is received and sequentially stored in the special character string temporary storage memory 6 (Fig. 4+31. (41) is detected in the above-mentioned discrimination processing S5 and S10, as shown in Fig. 4 (+31). As shown in Figure 5 (11), the received data is read and the mode conversion, that is, the Kanji mode flag is turned on.After this, the following data is converted to Kanji. When stored in the buffer and further detected in the above-mentioned discrimination process S17, !1, ~
"ESC" is stored in the external character string temporary storage memory 6, and the special character string medium flag TF in the status information memory 5 is turned on (FIG. 5(2)). However, if the next character is not input immediately, but after the fixed time has elapsed, that is, after the timer 2 has exceeded the specified value, this time is detected in the determination process S25 beforehand. Therefore, the special character string medium flag is turned off by processing S27, 82B, and the special character "ESC" is stored in the received data memory 8.

Therefore, even if "A" and "B" are subsequently received, since the special character string flag is off, they are stored in the received data memory 12 as they are.

Although the present invention has been described in detail above, the present invention is applicable not only to data transmission between a computer and a computer, but also to data transmission between a terminal device and a computer and a combination device. I can do it.

〔Effect of the invention〕

As described above, the present invention determines whether or not a special character string is being transmitted at high speed to determine whether or not it is an instruction to switch modes. It can be operated without sensing the transmission of the code at all, and even if the specific code, that is, the escape sequence data, etc. does not include a discrimination code, it can be determined whether the specific code is data to be received or a code for mode switching. It is possible to obtain a data communication device for receiving data.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, FIG. 2 is an operation flowchart of the embodiment of the present invention, and FIGS. 3 to 5 are memory content diagrams. 1... Processor (CPU), 2... Timer (Timer), 3... Reception B
U F F E R. 5... Status information memory, 6... Special character string temporary storage memory, 7... Special character string comparison information memory. Patent Applicant Casio Computer Co., Ltd. 5th Figure 1111111 Figure 5

Claims (1)

[Scope of Claims] Receiving means for receiving data; first determining means for determining whether or not data input from the receiving means is first specific data; a second determining means for determining whether at least one piece of data subsequent to the first specific data is second specific data within a specific time from when it is determined that the data is specific data; A data communication device comprising mode switching means for switching the mode of the receiving means when the means determines that the received data is the second specific data.