JPS62269527A - Terminal equipment applying parity control - Google Patents

Abstract

PURPOSE:To simply switch the mode with/without parity by inputting a special control code from a keyboard at any time and detecting the said control code to switch the mode with parity or the mode without parity. CONSTITUTION:A control code switching the mode with/without parity is generated from a code generating section 11 by using a function key or the keying of combinarion of plural prescribed keys provided to a keyboard 10, stored once in a sending character buffer 12 together with character codes by keying of other keys, extracted and detected sequentially by a control code detection section 15 sequentially and the mode corresponding to the control code is set to a mode storage section 16. A parity addition section 17 adds a 1 bit of parity bit to each sent character when the storage section 16 stores the mode with parity to convert data into a form of data 7 bits + parity 1 bit. In storing the mode without parity by the storage section 16 the unit of the sent data is a form of data 8 bits.

Description

[Detailed Description of the Invention] [Summary] A special control code that can be distinguished from other character codes is determined in advance, and the control code can be entered manually from the keyboard at any time. By detecting the control code, parity is determined. It is possible to switch between a mode with parity and a mode without parity, so that data can be transmitted in either a 7-bit data + 1-bit parity format or an 8-bit data format.

[Industrial application field]

The present invention relates to a terminal device that performs data communication with a host processing device via a modem, and relates to a terminal device that performs parity control that allows easy switching between data transmission with parity and data transmission without parity.

[Conventional technology]

The so-called ASCII character set is a standard code often used in data processing systems, data communication systems, and information exchange between related devices.

The ASCII character set uses 27 bits to represent character types.
For data transmission and reception, etc.

Normally, a format of 7 data bits + 1 parity bit is often used, with 1 parity bit being an odd or even check bit added.

On the other hand, recently, Japanese codes including Kanji codes have been increasingly used, and in the case of one Japanese code, 16 bits are often used. In this case, it is desirable to transmit and receive data in 8-bit units without adding parity bits.

In particular, when transmitting and receiving data between a host processing device that processes data and a terminal device that inputs and outputs data at a remote location, data sent from one terminal device in a so-called interactive manner is echoed back from the host processing device. Since the parity bit is displayed each time, the operator can detect transmission errors such as bit inversion, and even if there is no parity bit, there is almost no problem.

However, in the control interface between a modem that modulates and demodulates digital signals and a terminal device, for example, the number to be dialed when making an automatic call is limited.

There are cases where the modem requires that a parity bit be added; in this case, the terminal equipment.

Data sent to the modem and data sent to the host processing device must be distinguished and controlled with or without parity.

Conventionally, in such cases, controls such as adding a parity bit or omitting a parity bit have been performed using a switch or the like provided in the terminal device.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional method, when performing automatic dial transmission, etc., two different types of operations are required: input operations from the terminal device's keyboard and on/off operations of switches, and the operations are cumbersome. There's a problem.

If modes can be changed by pressing a key on a keyboard rather than using a switch, the operation can be performed continuously.

It is believed that data input including dial numbers will be simplified. Also, if there is a control code that controls the parity/non-parity mode switching.

Since this control code can be handled in the same way as a normal character code, it is possible to register the control code in advance together with a dial transmission command, dial number, etc.

By focusing on this point, the present invention aims to provide a terminal device that performs parity control with good operability.

Measures to solve problem C] FIG. 1 shows an example of the basic configuration of the present invention.

In FIG. 1, 10 is a keyboard; 11 is a code generation unit that generates a code signal corresponding to a pressed key;
12 is a transmission character buffer in which transmission character data consisting of a code string generated by the code generation unit 11 is stored;
13 is a transmission character counter that counts characters to be transmitted; 14
Reference numeral 15 indicates a parity control unit that controls adding or not adding a parity bit to a transmitted character; 15 indicates a control code detection unit that detects a specific control code that instructs mode switching between with and without parity; and 16 indicates a control code detection unit. A mode storage section stores a mode with parity or no parity upon detection; 17 is a parity addition section that adds a parity bit to the transmitted character when mode storage section 16 indicates a mode with parity; 18 is 8-bit parallel data; represents a parallel/serial converter that converts the data into serial data and sends it to the modem.

In the case of the present invention, a control code for switching between the mode with parity and the mode without parity is determined in advance. This control code is handled in the same way as other normal character codes, and is assigned a bit pattern that is distinguishable from conventional character codes.

The control code for switching the mode with/without parity is generated by the code generation unit 11 by pressing a function key provided on the keyboard 10 or a predetermined combination of a plurality of keys. This control code is temporarily stored in the transmission character buffer 12 together with character codes generated by pressing other keys, and is sequentially transmitted to the control code detection unit 1.
5, the control code is extracted and the control code is determined.

When a control code is detected by the control code detection section 15, a mode corresponding to the control code is set in the mode storage section 16.

When the mode storage unit 16 stores the mode with parity, the parity addition unit 17 adds the following information to each transmission character:
Add 1 bit of odd or even parity bit and convert to 7 bits of data + 1 bit of parity. On the other hand, when the mode storage section 16 stores a mode without parity, the unit of transmission data is set to 8-bit data.According to the present invention, the parity control section 14 performs control with/without parity, so a switch or the like is not required, and operations for inputting five characters and switching modes are unified to input operations from the keyboard 10.

In addition, it is possible to handle the control code for mode switching in the same way as a normal character code, so recently 1
By using the word registration/conversion function that is often used in Japanese input, it is also possible to register the words along with other character strings in correspondence with a predetermined pronunciation.

〔Example〕

FIG. 2 shows an example of application of the present invention, and FIG. 3 shows an example of mode switching control according to an embodiment of the present invention.

In FIG. 2, the same reference numerals as in FIG. 1 correspond to those shown in FIG. 20 is a hippo sofa.

21 is a code string converter, 22 is a conversion dictionary, 23 is a modem, 24 is an automatic call control unit that generates dial pulses and controls automatic call, 25 is a line network such as a public line, 2
6 represents a host processing device that processes data.

FIG. 2 shows an example of application of the present invention to a remote terminal device having a Japanese input function. Note that the display is not shown. This terminal device has a function of converting the reading of a kana character string or a Roman character string into a character string including a kanji code.

The reading code string input from the keyboard 10 is stored in the input cover sofa 20, and when a so-called "conversion" key is pressed, it is delivered to the code string converter 21. In the conversion dictionary 22, codes of character strings including kanji codes are registered and stored in advance in correspondence with code strings of each reading.

The code string converter 21 refers to the conversion dictionary 22.

Performs processing such as kana-kanji conversion/word conversion that is known with word processors, etc., and outputs the conversion results.

Store it in the transmission character buffer 12. Note that when the "no conversion" key is pressed, the contents of the large cover 20 are transferred to the transmission character buffer 12 as they are.

The character string stored in the transmission character buffer 12 is:

The parity controller 14 performs the parity/non-parity control described in FIG. 1, and sends the signal to the modem 23 via the parallel/serial converter 18.

The data sent to the modem 23 includes data for controlling the modem 23 related to connection/disconnection of one line, and data to be sent to the host processing device 26. A control code can be used to switch data to the parity-equipped two-host processing device 26 to have no parity.

Next, a specific control example will be explained according to FIG. In FIG. 3, 30 is a start control code with parity;
1 is the termination control code with parity.

32 represents a conversion key code, and 33 represents transmission data to the modem.

The start control code with parity 30 and the end control code with parity 31 can be input by pressing keys from the keyboard IO. When the contents of the transmission character buffer 12 shown in FIG. 3(a) are transmitted, one character string rABCJ is transmitted with parity due to mode switching upon detection of the start control code 30 with parity. The next end control code with parity 31 sets the mode to no parity, and the 9 character string rDEFJ is transmitted without parity, with the 8th bit being "0".

In the system shown in FIG. 2, 3, for example, as shown in FIG. 3 (b), rA, 1. When "conversion key" is pressed, the code string converter 21 converts 9 "A.

The character string corresponding to the reading ``1'' is read out. In this example, "start control code with parity, D, end control code with 1, 2, 3, 4° parity" is registered corresponding to the readings of rA and IJ.

These character strings are set into the transmit character buffer 12. By the start control code 30 with parity at the beginning,
The parity addition unit 17 adds a parity bit to the following character string, and the transmission data 33 of "rD1234" becomes
It is sent to modem 23.

Note that this data is sent to the automatic call control unit 24.

This is control data instructing to call the dial number r1234J.

In the above embodiment, two types of control codes, the start control code with parity 30 and the end control code with parity 31, are used, but the modes may be alternately switched using one type of control code.

〔Effect of the invention〕

As explained above, according to the present invention, the mode with/without parity can be easily switched. In addition, data for modem control that requires parity and data without parity to be sent to the host processing unit are
Each can be stored as a series of code strings. This is particularly effective when it is desired to use both the Shift JIS code used in personal computer communication and the ASCrl code used in the interface with a modem with an automatic call function.

[Brief explanation of drawings]

FIG. 1 shows an example of the basic configuration of the present invention, FIG. 2 shows an example of application of the invention, and FIG. 3 shows an example of mode switching control according to an embodiment of the invention. In the figure, 10 is a keyboard, and 11 is a code generator. 12 is a sending character buffer, 13 is a sending character counter, 1
4 is a parity control section, 15 is a control code detection section, 16 is a mode storage section, 17 is a parity addition section, 18 is a parallel/serial conversion section, 3(N;! Start control code with parity, 31 is an end control with parity) Represents a code.

Claims (1)

[Scope of Claims] A terminal device comprising a keyboard (10) and transmitting character data input from the keyboard (10) to a host processing device via a modem. means (11) for inputting a control code distinguishable from other character codes for switching between parity or non-parity when the input character code is sent to the modem; control code detection means (15) for checking whether or not the control code is present in the data sent to the modem; mode storage means (16) for switching between a mode with parity or a mode without parity and storing the mode when it is detected that the mode exists; and the mode storage means (16);
A terminal device that performs parity control, comprising means (17) for adding parity to data transmitted to the modem when indicating a mode with parity.