| 摘要 |
PURPOSE:To reduce the probability of malfunction by giving the call after confirming that the portable slave unit is ready for reception. CONSTITUTION:The number of portable slave unit 4 desired to be called out is supplied through input device 22 to be memorized in memory circuit 21 as well as to be transmitted through loop antenna 3. When unit 4 is in the reception enable area, the reception is transmitted. And the transmitter transmits again the code supplied to the slave unit, and the slave unit informs its carrer the calling with the second recption. In case unit 4 is not in the reception enable area, lamp 18 glows to indicate that the carrier is absent there. |
