| 摘要 |
<p>PURPOSE:To suppress noise to improve the reliability and the service ability of a cross call system by receiving power from the power source of each controller and that of a device individually and detecting power source voltages. CONSTITUTION:A device 4 is connected to two controllers 1 and 2 through a device cross call 3. The device cross call 3 receives control signals from controllers 1 and 2 and the device 4 and receives power from the power source of controllers 1 and 2 and that of the device 4 and detects turning-on/off of individual power sources to suppress the noise of control signals. Power is supplied to the device cross call 3 from the power source of each controller and that of the device individually and is detected in this manner, thereby suppressing the noise to improve the reliability and the serviceability of the cross call system.</p> |
