| 摘要 |
PURPOSE: A fire alarm relay is provided to receive clock signals through a clock oscillation part, to maintain a constant voltage through a constant-voltage circuit part, and to initialize a central processing part by resetting it when an unstable voltage is supplied through a voltage monitoring reset circuit part, thereby enabling stable operation even with external impact. CONSTITUTION: A fire alarm relay(350) equipped with a protection function is composed of the following parts: a control command receiving part(351); a central processing part(353) controlling overall functions of the fire alarm relay; an abnormal signal transmission part(357); a constant-voltage circuit part(360) converting a pulse voltage(24V) supplied from a receiver into a driving voltage(5V) of the central processing part; a voltage monitoring reset circuit part(362); a clock oscillation part(364); and a communication lamp indication part(368). [Reference numerals] (353) Central processing part |
