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Chapter 8: Managing External Devices
179
States of Managed Sensors
An environmental sensor shows the state after being managed.
Available sensor states vary depending on the sensor type -- numeric or
discrete sensors. For example, a contact closure sensor is a discrete
(on/off) sensor so it switches between three states only -- unavailable,
alarmed and normal.
discrete sensors. For example, a contact closure sensor is a discrete
(on/off) sensor so it switches between three states only -- unavailable,
alarmed and normal.
Note: Numeric sensors use numeric values to indicate the environmental
or internal conditions while discrete (on/off) sensors use alphabetical
characters only to indicate the state changes.
or internal conditions while discrete (on/off) sensors use alphabetical
characters only to indicate the state changes.
Sensor state
Applicable to
unavailable
All sensors
alarmed
Discrete sensors
normal
All sensors
below lower critical
Numeric sensors
below lower warning
Numeric sensors
above upper warning
Numeric sensors
above upper critical
Numeric sensors
"unavailable" State
The unavailable state means the connectivity to the sensor is lost.
The EMX pings all managed sensors at regular intervals in seconds. If it
does not detect a particular sensor for three consecutive scans, the
unavailable state is displayed for that sensor.
does not detect a particular sensor for three consecutive scans, the
unavailable state is displayed for that sensor.
When the communication with a contact closure sensor's processor is
lost, all detectors (that is, all switches) connected to the same sensor
module show the "unavailable" state.
lost, all detectors (that is, all switches) connected to the same sensor
module show the "unavailable" state.
Note: When the sensor is deemed unavailable, the existing sensor
configuration remains unchanged. For example, the ID number assigned
to the sensor remains associated with it.
configuration remains unchanged. For example, the ID number assigned
to the sensor remains associated with it.
The EMX continues to ping unavailable sensors, and moves out of the
unavailable state after detecting the sensor for two consecutive scans.
unavailable state after detecting the sensor for two consecutive scans.