The detection grids in <AlarmArea>; each one present is replaced.
optional
chn: number
Zero-based channel.
optional
mdArea: AlarmAreaGrid
Motion detection grid.
optional
personArea: AlarmAreaGrid
Person detection grid.
optional
vehicleArea: AlarmAreaGrid
Vehicle detection grid.
optional
faceArea: AlarmAreaGrid
Face detection grid.
optional
dogCatArea: AlarmAreaGrid
Dog and cat detection grid.