Phonetics 1104 Manuel D’Utilisation

To wire several normally open sensors to one alert input, connect
them in parallel. To do this, take one lead from each sensor and
attach it to the numbered terminal. Then, take the second lead
from each sensor and attach each to the corresponding ground
screw. Refer to Figure 2-9.

When wiring sensors outdoors, DO NOT allow exposed wires to
run freely in open air; under such conditions, the Model 1104 is
susceptible to serious damage during a lightning storm.
Depending upon the distance outdoor wiring must travel,
consideration should be given to the use of shielded wire inside a
metal conduit. Both shield and conduit should be connected to an
earth ground. This prevents stray voltage from entering the unit.

Alert condition occurs 
when a normally open 
switch closes.

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Multiple normally-closed 
sensors wired in series 
(example using Input 2)

Alert condition 
occurs when a 
switch is opened