JPH09204252A - Wireless data input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve the danger that a computer malfunctions by the transmission defect of a key off code due to radio wave faults or the like in a wireless keyboard device. SOLUTION: In the keyboard control part 8 of the wireless keyboard device 1, in addition to a normal control function for outputting the on code and off code of a pertinent key corresponding to the state of a key matrix circuit 7, a control function for outputting an all off code when all the keys are turned off is provided. When all the keys are turned off, the all off code is automatically transmitted. At the time of receiving the all off code, a wireless data receiver 14 transmits the off code of an on key recorded in a status register 18 to the computer 13 and simultaneously eliminates a recorded on key number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless data input device, and more particularly to a wireless data input device having a function of reducing communication error.

[0002]

2. Description of the Related Art A wireless data input device is known in which data communication between a computer and a keyboard is wireless. The wireless data input device comprises a wireless keyboard device and a wireless data receiver connected to a computer.

The structure of the keyboard portion of the wireless keyboard device is the same as that of a general keyboard device, in addition to a key matrix circuit and a keyboard control portion, an RF transmitter or an infrared transmitter, and communication for converting a key code into a predetermined communication format. It has an interface. The keyboard control unit scans the key matrix circuit at regular time intervals, transmits the key code of the valid key that is turned on, and when the key is turned off, transmits the code indicating the off state of the corresponding key.

The wireless data receiver converts the received code into an input format of a computer by an interface and inputs the code into the computer.

[0005]

In the wireless data communication between the wireless keyboard device and the receiving device, the received data may be partially missing or deformed due to radio interference such as superposition of electromagnetic noise. If the key-on code is missing or the computer cannot handle it,
You will have to press the same key again and try again, but this is not a serious problem, but if the off code when you turn off the key is not received properly and the computer cannot recognize the on-to-off transition, it will be judged as key on. Data processing may proceed in the same state and malfunction. In particular, when a shift key OFF code is not received, or when the same key continues to be ON for a certain set time, the key data is repeatedly input. It is conceivable that unintended data may be input or a runaway may occur due to a communication failure in.

Therefore, there arises a technical problem to be solved in order to reduce the possibility of malfunction of the computer in the wireless data communication by the wireless data input device, and the present invention solves the above problem. The purpose is to

[0007]

The present invention is proposed to achieve the above object, and is a wireless data input device including a wireless keyboard device and a wireless data receiver connected to a computer. The control unit of the wireless keyboard device is provided with control means for transmitting a specific code indicating the off state of all keys when all the keys are turned off, and the control unit of the wireless data receiver is turned on. A status register for recording the key number of, when receiving the code indicating the off state of all keys, outputs the off code of the key whose on state is recorded in the status register at that time to the computer, In addition, a control means for erasing the on-key record of the status register is provided. There is provided a wireless data input device for.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a wireless keyboard device 1, on the upper surface of a housing 2 of which various keys 3 such as alphanumeric keys and function keys are arranged. A pointing device 4 is provided on the right side of the upper surface, and an external pointing device connecting connector 5 is provided on the back surface.

In the housing 2, in addition to a power supply battery (not shown), a buzzer 6 that emits a warning sound when the power supply voltage drops below a specified value, a key matrix circuit 7 shown in FIG. 2, and a keyboard controller. 8, a pointing device controller 9, a communication controller 11 including a communication interface 10 such as Centronics, and a transmitter 12 are provided.

The key code of the valid key read from the key matrix circuit 7 and the output of the pointing device 4 are converted into serial data of a predetermined communication format by the communication interface 10 and transmitted by the transmitter 12. As the transmitter 12, an RF transmitter or an infrared transmitter is used.

The keyboard control section 8 has a function of outputting a key code of the corresponding key according to the state of the key matrix circuit 7, and a control function of outputting an all-off code when all the keys are turned off. It is provided. As shown in FIG. 3, when the power is turned on (step 101), after initialization (step 102), the key matrix circuit 8 is scanned at regular time intervals (step 103) to search for an effective key (step 104). .

When a certain key is operated and the ON state is detected, the routine proceeds from step 104 to step 105,
A key code corresponding to ON of the valid key is set in the output buffer of the communication control unit (step 106) and transmitted to the computer side (step 110).

When the state of the key shifts from on to off, the process proceeds from step 105 to step 107 to set a key code corresponding to the off of the corresponding key in the output buffer, and if there is another on key, Step 1
The process proceeds from step 08 to step 110 to transmit the off code set in the output buffer.

Further, when the key matrix circuit 7 is scanned and all the keys that have been in the on state have shifted to the off state, the routine proceeds from step 108 to step 109,
An all-off code indicating that all the keys are off is set in the output buffer, and the process proceeds to step 110 to transmit the all-off code.

The transmission signal from the wireless keyboard device 1 is received by the receiver 15 of the wireless data receiver 14 connected to the computer 13 shown in FIG. 2, and the input interface of the computer 13 is input by the communication interface 17 of the communication controller 16. And is input to the computer 13.

The communication control unit 16 is provided with a status register 18 for recording the on-key number based on the received on-key data. When the key-off data is received, the key number record of the corresponding key is erased.

When an all-off code is received from the wireless keyboard device, the off-codes of all keys whose on-states are recorded in the status register 18 at that time are output to the computer 13 and the status register 18 outputs Clears all on-key number records.

Therefore, as described above, even if the wireless data receiver cannot receive the off code of a certain key due to radio interference or noise superposition while each key is randomly turned on and off. , When all keys of the wireless keyboard device are turned off,
An all-off code is output from the wireless keyboard device to compensate for an off-code communication error of an individual key, and it is possible to prevent a malfunction of the system due to a missing off-code.

The present invention is not limited to the above-described embodiment, and the wireless keyboard device and the wireless data receiver are provided with a transmission / reception function so that the wireless keyboard device, the wireless data receiver and the computer can perform bidirectional communication. You may comprise the system which communicates. In this case, the command output from the computer to the wireless keyboard device is transmitted by the transmitter of the wireless data receiver, received by the receiver of the wireless keyboard device, demodulated, and input to the communication control unit to input the keyboard control unit and the keyboard control unit. The operation of the pointing device controller is controlled.

Further, the configurations of the wireless keyboard device and the wireless data receiver can be variously modified within the technical scope of the present invention, and it goes without saying that the present invention extends to these modified ones.

[0021]

As described above, since the wireless data input device of the present invention transmits the all-off code indicating that state when all the keys are in the off state,
Even if the off code when each key is turned off is not received by the computer due to radio interference, etc., the off code of each key can be compensated by the all off code, and the computer recognizes the key on cancellation. By doing so, it is possible to prevent malfunction of the system, and it is effective in improving the stability of wireless data communication.

[Brief description of drawings]

FIG. 1 is a plan view of a wireless keyboard device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a wireless data input device of the present invention.

FIG. 3 is a communication control flowchart of the wireless keyboard device of the present invention.

[Explanation of symbols]

 1 wireless keyboard device 7 key matrix circuit 8 keyboard control unit 10 communication interface 11 communication control unit 12 transmitter 13 computer 14 wireless data receiver 15 receiver 16 communication control unit 17 communication interface 18 status register

Claims (1)

[Claims] 1. A wireless data input device comprising a wireless keyboard device and a wireless data receiver connected to a computer, wherein a control unit of the wireless keyboard device is operated when all keys are turned off. A control means for transmitting a specific code indicating the off state of all keys is provided, and a status register for recording the key number of the on state is provided in the control unit of the wireless data receiver, and the code indicating the off state of all keys is provided. When received, wireless data characterized by including control means for outputting to the computer an off code of a key whose on state is recorded in the status register at that time and erasing the on key record of the status register Input device.