American Dynamics ADRL3TRK Series Service Manual page 10

ATMEGA 128 block diagram
Vision area (for surveillance), dead zones (for stopping), and maintenance areas (for servicing)
Rail
Vision Area
Vision Area + Two 1.5m (4.9ft) Dead Zones
Vision Area + Two 1.5m (5ft) Dead Zones +Two 30cm (1ft) Light Reduction Sections = Total Length of Rail
Total Length of Rail + Two 0.6m (2ft) Maintenance Areas
SENSORRAIL IIIE 8200-0593-03, REV. A
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SERVICE GUIDE