Site Alann - ACC RC-96 Owner's Manual

Chapter Eight: Interfacing to Other Equipment
Site Alarm RIC
connector, pin 1
The Site Alarm logic input to the controller provides an over-the­
air alarm announcement when the alarm logic input is taken high.
The alarm message is programmed with the Alarm Message
Programming command. The site alarm may
be used as an
indication of intrusion, over-temperature, water on the floor, or
even as a weather radio storm alert or aviation ELTwaming.
The alarm is activated by applying a high logic signal (2.4 - 15
volts) to the Alarm. Input at RIC connector pin 1. The alarm
signal can
be derived from other circuitry, such as a temperature
sensor, or from a normally open switch which applies a voltage
to the Alarm input when Closed. Alternatively, for more security
in intrusion detection applications, a pull-up resistor on the board
can
be grounded by a normally closed switch, and iithe switch is
opened or if wires are cut, the alarm will
be activated.
Activation of the site alarm causes the alarm message to be
announced over the repeater transmitter at 15 second intervals,
until cleared by a Control Op or until the Alarm Timer times out.
The alarm condition is latching - meaning that once the logic
input is taken high, the alarm condition continues even if the
logic input is returned low. This insures that detectors such as
limit switches for intrusion detect cause a continuing alarm that
does not cancel once the switch is closed. The alarm condition
should be removed before the alarm is re-enabled.
RC-96
( SENSOR.
]t----)iI
~t~r
REPEATER
CONTROLLER
-----'iI
ALARM
RC-96
, INPUT
REPEATER
CONTROLLER
r------~--~---~
ALARM
RC-96
INPUT
REPEATER
CONTROLLER
Fig. 8-5. Site Alarm Applications
74 • RC-96 REPEATER CONTROLLER OWNER'S MANUAL