| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller owned by each answering person which is small-sized and also simple, does not need wiring due to being portable as wireless, does not need much space, is so convenient that a carrier can freely move around, also is inexpensive, can communicate with a computer of a receiving side even when other controllers are communicating with the computer and prevents confusion even in a simultaneous transmission state. SOLUTION: A controller 1 is portable and has a key inputting part 7, a liquid crystal displaying part 8 and an infrared code signal transmitting means, a computer 2 is connected to receivers each consisting of a receiving header 3 which receives an infrared code signal, converts it into an electric signal and amplify it and a receiving station 4 which collects signals from the headers 3, decodes codes and transmits them to the computer, an identification code is preliminarily attached to each controller 1, and the receiver recognizes each controller on the basis of the identification code, decodes an infrared code and sends information to the computer 2. |
