| 摘要 |
PURPOSE:To eliminate a wrong recognition from users by providing a common operating unit, an audio unit and a display unit for multiple source units for a vehicle, etc., adding the function to store the existence of the connection of a terminal source to each unit, and displaying information about the terminal source on the display unit on the basis of the storage. CONSTITUTION:When an electric power source is turned on, the operating unit 1 conducts serial polling for each units and recongnizes the existence of the connection of units 3-5. At the same time, the unit 5 checks the existence of the connection of terminal sources 5a-5n and stores the results. When the information on the terminal sources of the audio unit 5 is displayed on the display of the operating unit 2, the operating unit 1 requests the audio unit 5 to send the existance of the connection of the unit 5 itself and the status on the connection of the terminal sources 5a to 5n. After receiving the status information from the audio unit 5, the operating unit 1 sends the status to indicate the existance of the connection of the terminal sources 5a-5n to the display unit 2. |
