User Instructions

The inputs that the user provides to a UIA are termed user instructions (or simply instructions). User instructions to a UIA can fall under the following categories:

• perform UIA actions immediately. e.g., Heat pool now. Read temperature now.

• perform UIA actions after a specific amount of time. e.g., Heat pool after 5 minutes. Read temperature after 5 minutes.

• perform UIA actions at specific time. e.g., Heat pool at 7:00 am. Read temperature at 7:00 am.

• perform UIA actions indefinitely. e.g., Keep ringing the bell.

• perform UIA actions for a specific period of time. e.g., Keep ringing the bell from 5:00 pm to 5:01 pm.

• perform UIA actions at periodic intervals, indefinitely. e.g., Heat pool at 6:00 am everyday. Heat pool at 10:00 am on non-working days.

• perform UIA actions at periodic intervals, for a specific period of time. e.g., Heat pool at 8:00 am everyday this week. Heat pool at 10:00 am on every non-working day this month.

• perform UIA actions when certain conditions hold. e.g., Heat pool at 7:00 pm today if the short-circuit problem has been fixed by then. Heat pool after 6:00 pm if the temperature is below $80^oF$ and the voltage level is not low.