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For the contact alarm sensors, the hysteresis can be used to adjust the sensitivity of an
alarm. The alarm will be active or inactive only after the alarm stays in the same state
for the duration of the hysteresis value (in seconds). For example, if the hysteresis is 5
for an alarm, the alarm will NOT activate until the same state has persisted for 5
seconds. This ruling also applies in reverse so that the alarm has to stay in an inactive
state for 5 seconds before the sensor status is recorded as normal.
Calibration Offset
If the measurement value of a sensor does not, for whatever reason, comply with the
actual environment, the 'Calibration Offset' setting can be configured to adjust the
final value of the sensor. For example, if a sensor reports 43% humidity for a 45%
humidity environment, the administrator can configure the humidity offset as 2% so
the sensor can then adjust its final value to 45%.
Alarm Type
If an alarm sensor (water leak, security, etc) is connected to the EMD, the
administrator can configure the alarm as 'Disabled', 'Normal Open', 'Normal Close',
'High Active', or 'Low Active'. A 'Disabled' setting will mean the alarm is inactive.
'Normal Open' and 'Normal Close' are used for a two-wire detector that will emulate
an open/close state. When the wires are closed to 'loopback' (the signal for the sensor),
the sensor will detect the state as closed. The sensor will NOT activate the alarm for
'Normal Close' in this case, although the alarm will be activated if configured as
'Normal Open'.
'High Active' and 'Low Active' can be configured when a 'contact closure' type
detector is attached. The administrator should connect the wire to the right side of the
alarm (marked as arrow-in), and 8 to 12 VDC should be able to be detected by the
EMD as 'high' state.
Device Status
The EMD can be configured as 'Disabled' or 'Auto'. The setup should be configured as
'Disabled' if an EMD is not attached to the port. The EMD type will be auto detected
by the EMD if configured as 'Auto' and if the EMD is plugged into the port.
