| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a Bluetooth system that can prevent a battery acting like a drive power supply from being uselessly consumed due to a worn battery of other connected device. SOLUTION: The Bluetooth connects a handset and a cellular phone. They are provided with a power supply monitor circuit that monitors a battery acting like a drive power supply. When the power supply monitor circuit of the handset detects a worn battery, the handset transmits a sleep command to the cellular phone, when the cellular phone receives the sleep command, the cellular phone informs a user about transit to the sleep command and shifts itself to the sleep mode. Even the handset side turns off its power supply. In this case, when the cellular phone receives the command from the handset, the handset can set through notice of a setting command to the cellular phone upon the receipt of the command whether the cellular phone turns off its power supply, transits to the sleep mode or remains the power ON.</p> |
