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14 C1517M-A (11/02)
OPERATION
The function of the alarm unit is to physically monitor all alarm inputs for a change of state.
Green LEDs on the front and rear panels light when the power is turned on.
The red alarm LED indicates whether the unit is offline or online. This light starts blinking in any valid alarm condition and only stops
when the alarm is no longer active.
For supervised inputs, the unit monitors each alarm input for a constant current through the wiring of the alarm circuit. The alarm consists
of either a 10-kohm resistor connected in series with a normally closed contact or a 10-kohm resistor connected in parallel with a normally
open contact.
For unsupervised inputs, the unit monitors each alarm input for a change of state from that previously defined by DIP switch positions as
being normally open or normally closed. A change from the defined state (normally open to normally closed or normally closed to normally
open) activates an alarm condition.
The alarm unit activates the relay whenever a valid alarm condition is sensed. If multiple alarm points are activated on a given alarm unit,
the relay remains engaged as long as any of these alarm conditions remain active.