beeping alarms that have a half-second or more of silence
between beeps will not be detected.
Other programming options that apply to the microphone include
setting the length of time before a high sound causes an alarm.
If this sound level exists for 8 consecutive seconds (default) or for
the programmed length of time, the Model 1108 will dial out with
an alarm message.
NOTE
The proximity of the audible alarm to the microphone
is extremely important. Normally, the Model 1108
and the audible alarm must be in the same room. The
maximum distance can vary considerably depending
on the alarm, the acoustics, and the size of the room.
During an alarm dial-out, the microphone allows four-second
intervals to listen in to sounds at the Model 1108’s location.
When calling for a Status Report, the microphone permits
listening to on-site sounds for a programmed time interval.
2.9 Alert Inputs
The Model 1108 can monitor up to 8 inputs (represented by the
numbered terminal screws shown in Figure 2-5, below). Two input
terminals share the same ground.
Figure 2-5. Alert Inputs
Inputs are configured as either dry contact or temperature. An
input configured as dry contact can be used with any normally
open (N.O.) or normally closed (N.C.) device.Open refers to an
opened circuit path; if conditions cause the circuit to close, an
alert condition occurs. Closedrefers to a continuous circuit path;
if a closed circuit is opened, an alert condition occurs. The Model
1108 determines the way inputs are configured by the type of
sensor connected to each alert input (refer to Chapter 5, Section
5.1).
An input configured as temperature is designed to evaluate a
range of settings. The Model 1108 will read the temperature at the
sensor’s location and compare that value to programmed high and
Chapter 2:Installation
25