| 摘要 |
PURPOSE:To prevent unarrival of a control key data and to prevent a data error or the like by collating a key data set from a keyboard side with a key data to be returned. CONSTITUTION:A key data inputted from a key matrix 10 is stored in a memory 7 and sent to a personal computer 2 via an infrared ray transmitter 8. The personal computer 2 uses an infrared ray receiver 11 to receive the key data sent from a keyboard 1 and returns the key data from an infrared ray transmitter 12 to the keyboard 1 via a key data return device 13 and sends the result to a personal computer key entry interface 14. The keyboard 1 uses an infrared ray receiver 3 to receive a return key data sent from the personal computer and a CPU 5 collates the return key data with the transmission key data stored in the memory 7 and controls an alarm device 6 at the dissidence to generate an alarm tone thereby informing disable control of the personal computer to the operator of a control section. |
