JPH09190263A - Key data format for wireless data input system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten data length and to speed up communication speed in a wireless data input system. SOLUTION: Data D in transmission data of a wireless keyboard composed of the four blocks of a header H, a status code S, data D and a check sum C is composed of the key codes (a) of seven bits displaying the types of keys and the on/off code (b) of one bit for discriminating the on/off of the keys. The total number of the keys in a keyboard device is about 110 at maximum. Thus, the key codes (a) of seven bits can correspond to all the keys and on/off information of all the keys is expressed with eight bits data to which the on/off code (b) is added.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key data format of a wireless data input system using a wireless keyboard device, and more particularly to a key data format of a wireless data input system having a reduced data length.

[0002]

2. Description of the Related Art Wireless data input systems are known which wirelessly transmit key data from a wireless keyboard device to a computer. Usually, the communication data structure of this kind of wireless data input system is composed of a header, a status code, key data and a checksum, and the key data is such that a key code block of about 1 byte is connected to an on / off code block.

[0003]

In the wireless data input system, the data transmission time is longer than that of the system using the wired keyboard due to the communication data length, and the data communication speed per unit time is reduced.
Therefore, there is a technical problem to be solved in order to rationalize the communication data structure, shorten the data transmission time as much as possible, and increase the data communication amount per unit time. It aims to solve problems.

[0004]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above object, and in a wireless data input system for wirelessly transmitting key data from a wireless keyboard device to a computer, the key data of 7 bits is used. The present invention provides a key data format of a wireless data input system, which is 8-bit data consisting of a key code and a 1-bit code representing ON / OFF of the key.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows transmission data of the wireless keyboard device, which includes a header H, a status code S,
The data D and the checksum C are composed of four blocks, and the data D is 8-bit data consisting of a 7-bit key code a indicating the type of the key and a 1-bit on / off code b for discriminating the on / off of the key. Is. The total number of keys on a wireless keyboard device is usually a maximum of 11 although it varies slightly depending on the keyboard design specifications.
Since there are about 0 keys, all keys can be expressed by the key code a of 7 bits = 128.

The key code of all keys is stored in the memory 3 of the keyboard control unit 2 of the wireless keyboard device 1 shown in FIG. 2, and the 7-bit key corresponding to the effective key read by scanning the key matrix circuit 4 is read. An 8-bit code obtained by adding a 1-bit code indicating the ON / OFF change state of the key to the code is output to the communication control unit 5 as data D.

Further, the pointing device controller 6
Monitors the status of the built-in pointing device 7,
Data corresponding to the output of the built-in pointing device 7 is output to the communication control unit 5.

The communication control unit 5 converts the input data into serial data of a predetermined communication format by the communication interface 8, modulates it by the transmitter 9, and transmits it. As the transmitter 9, an RF transmitter or an infrared transmitter is used. The transmission signal from the wireless keyboard device 1 is received by the computer and decoded by the communication interface, and the data input process is executed according to the key code and the on / off code in the 8-bit received data.

Further, when configuring a system for performing bidirectional communication between the wireless keyboard device 1 and a computer, a transmitter and a receiver are mounted respectively. In this case, the transmission signal from the computer is received by the receiver of the wireless keyboard device 1, demodulated, and input to the communication control unit 5 to control the operations of the keyboard control unit 2 and the pointing device control unit 6.

[0010]

As described above, in the key data format of the wireless data input system of the present invention, the key code and the on / off code are represented by 1 byte.
The data length is shortened as much as possible, the amount of data communication per unit time increases, and the communication speed increases. Further, the shortened communication time brings about various effects such as reduction in current consumption of the wireless keyboard device and extension of battery life.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a transmission data format of a wireless keyboard device according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram of a wireless keyboard device.

[Explanation of symbols]

 H header S status code D key data C checksum a key code b on / off code 1 wireless keyboard device 2 keyboard control unit 3 memory 4 key matrix circuit 5 communication control unit 6 pointing device control unit 7 built-in pointing device 8 communication interface 9 transmitter

Claims (1)

[Claims] 1. In a wireless data input system for wirelessly transmitting key data from a wireless keyboard device to a computer, the key data consists of a 7-bit key code and a 1-bit code representing ON / OFF of the key.
Key data format of wireless data input system characterized by bit data.