| 摘要 |
PURPOSE:To decrease the number of signal lines by identifying a transmission destination of a transmission request signal from an electronic equipment, opening an input gate and an output gate corresponding to the electronic equipment, outputting a transmission enable signal via the output gate and receiving a data from the electronic equipment given via the input gate. CONSTITUTION:When a transmission request signal is sent to a controller 13 via a transmission signal line from any electronic equipment, the controller 13 identifies from which electronic equipment the transmission request signal is sent. The input gate and the output gate corresponding to the identified electronic equipment are opened by a gate switching circuit 12 and a transmission enable signal is outputted to the opened output gate and a bit serial data given via the input gate from the electronic equipment is received and converted into a bit parallel data. Thus, the data is sent by having only to connect each electronic equipment and the controller 13 by one transmission signal line and on reception signal line only. Thus, even when the number of electronic equipments connected to the controller is increased, the number of signal lines is decreased.
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