Alpha Technologies Micro Secure UPS - Manual (Page 59)

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6.6.3 Types of Trigger
There are 3 types of trigger:
Edge trigger
When the user input changes from one state to the other, the Alpha Micro Secure is triggered to perform Action
#1. If the level is set to High, the action will be triggered by a Low to High edge (leading edge). If the level is set
to Low, the action will be triggered by the High to Low edge (falling edge).
Low to High
edge trigger User input
Action #1 Action #1
(a) Level = High
User Input = Low to High, Action #1 is triggered
User Input = High to Low, no action triggered
High to Low
edge trigger
User input
Action #1 Action #1
(b) Level = Low
User Input = High to Low, Action #1 is triggered
User Input = Low to High, no action triggered
Figure 47 — Edge Trigger
Level Toggle
When the Level is set to High, the Alpha Micro Secure is triggered to perform the other action when the user
input changes from Low to High. If the input then changes from High to Low, Action #2 will be triggered. In other
words, a level change in the user input will trigger an action toggle between Action #1 and #2.
Action #1 Action #1
Action #2 Action #2 User input
(a) Level = High
User Input = Low to High, Action #1 is triggered
User Input = High to Low, Action #2 is triggered
Action #2 Action #2
Action #1 Action #1
User input
(b) Level = Low
User Input = High to Low, Action #1 is triggered
User Input = Low to High, Action #2 is triggered
Figure 48 — Level Trigger