American Dynamics ADTT16 Operator's Manual page 96

Glossary
abnormal state
The state of a dome input that will trigger an alarm if it has been configured
to do so. For example, when a motion detector senses motion, that is the
abnormal state for the input, and it will trigger an alarm.
alarm
The system's response when a dome input changes from its normal state to its
abnormal state (if the system has been configured to respond to such a
condition). When an alarm is triggered, the T T beeps until
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you clear the alarm via the Clear button.
alarm mode
The condition of the T T when an alarm is active. In the
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alarm mode, the T T beeps and the associated alarm
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information is displayed on the LCD