Universal Devices ISY-994i Series, User Manual

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Notice also that when the flag is made True (the Then is executed), the flag program sets
itself to run at startup, and when the flag is made False (the Else is executed), the program
sets itself to not run at startup. This is the other time (mentioned in the previous
paragraph) when a program may run even though the Enabled box is not checked.
When ISY reboots, each program which is not set to run at startup has its status set to
False. Programs set to run at startup will evaluate the If conditions and run either the Then
path or the Else path (thus making the program's status either True for False respectively)
depending on whether the conditions evaluate to True or False. When a program which has
no conditions is run at startup, the Then path is executed.
As a result, when the Main Bath Motion Timer Enable program is set to True, it configures
itself to run at startup so that after an ISY reboot (for example after a power failure) it will
once again have a True status. Likewise, when the program is set to False it configures itself
to not run at startup and therefore will again have a False status after reboot. The effect is
that ISY remembers the state of this program even across reboots.
With this code in place, the motion sensor control may be enabled and disabled by any
desired action or schedule. For example, turning the Main Bath Lights switch Fast On to
disable sensor control, and Fast Off to reactivate control:
11.8.1.8Program #8 - Main Bath Motion Timer Enable/Disable – Enabled
If
Control 'Main Bath Lights' is switched Fast On
And Control 'Main Bath Lights' is not switched Fast Off
Then
Run Program 'Main Bath Motion Timer Enable' (Else Path)
Else
Run Program 'Main Bath Motion Timer Enable' (Then Path)
Notice that if the timer is currently counting down to shutoff (program 6) when the Main
Bath Motion Timer Enable flag is set to False, the countdown will be halted.
Now we approach the question of how long the timer should be set for. In light of the
concern mentioned at the beginning of this article, the timeout must not be made too short.
On the other hand, making the timeout longer than necessary results in wasted electricity
and reduced effectiveness and convenience.