The HAI executes the "ALL ON" and "ALL OFF" commands by room.
You select the paired rooms you want to respond to the ALL commands in PCAccess (i.e. Rooms 1 and 2, 3 and 4, 5 and 6, etc. are linked, if you select one of them to respond, the other is automatically selected).
The HAI uses the HLC Room ON/OFF commands to execute the "ALL ON/OFF" commands.
When the ALL ON/OFF command is issued it steps through the rooms selected in PCAccess.
It sends the appropriate Room ON/OFF command, then updates the status of all the units in that room, then moves on to the next room.
For a large install it can take several minutes to step through all of the rooms and units.