SmartZone Gateway EP042 User Manual
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Normal State
Normal state specifies the condition in which a contact is considered to be in a Normal,
Non-alarmed state.
Devices such as smoke alarms and air conditioning units often have normally open con-
tacts. To receive alarm indications from these types of units would cause alarms to be
issued when a monitored contact closes.
Setting normally closed in the case of a rack or cabinet door would cause an alarm con-
dition when the door was opened.
Trigger Type
The trigger type defaults for Open/Close sensors are specified here.
The three available options for trigger types are:
Level
Level triggering is the default mode. When an input physically transitions from a Normal
to Non-Normal state, an alarm is triggered. However, the alarm persists only while the
input remains in a Non-Normal state. When the input returns to a normal state, the alarm
is cleared.
Normal to Non-Normal (Positive Edge)
This type of triggering may be used in situations where a momentary type input (for
example,: a shock sensor or PIR) is used. Since these types of inputs are momentary,
any alarm condition that occurs will persist until manually cleared.
Positive Edge triggering is used when an alarm is required to persist after an input
changes from the Normal state to the Non-Normal state.
Non-Normal to Normal (Negative Edge)
This type of triggering may be used in situations where a momentary type input (for
example, a shock sensor or PIR) is used. Since these types of inputs are momentary,
any alarm condition that occurs will persist until manually cleared.
Negative Edge triggering is used when an alarm is required to persist after an input
changes from the Non-Normal to the Normal state.
