Sutron Corporation X-Link Operations & Maintenance Manual, Rev 1.63 5/24/2016 pg. 67
If the absolute difference between the two readings (absolute of current reading
minus past reading) is greater or equal to the Alarm Threshold, the station goes
into alarm.
The same station goes out of alarm if the absolute difference between the two
readings (absolute of current reading minus past reading) is less than the Alarm
Threshold minus Alarm Deadband.
Exception: ROC alarms setup for Since Last Tx do not generate out of alarm
events or transmissions.
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