User's Manual

Versus Technology, Inc.
Hardware and Wiring Installation Guide 15
Due to the line-of-sight nature of the infrared light created by the ID badges, it is also possible to
apply masking to the sensor to limit or control the field of view by opening the sensor case and
placing electrical tape over the receiver “eye” whose field of view needs to be blocked. However,
proper placement is always the preferred method for controlling, rather than eliminating, sensor
field of view.
3.3.2.2 Effective coverage of rooms
A single sensor placed near the middle of the ceiling can usually effectively cover an office or
meeting room. A single sensor generally covers offices or rooms as large as approximately 30
feet square. The sensor should be located so that it has the best possible view of the room. If
the room is very large or has a complex shape and no single sensor position will provide
adequate coverage, multiple sensors will be needed. For effective coverage, place sensors
approximately 30 feet apart.
3.3.2.3 Overlapping Sensors
Sensor overlap occurs when two (or more) sensors are placed so that their fields of view
overlap. This will cause some indecision in the system if both sensors see a badge at the same
time. The software will not change the location of a badge when it is in an overlap area unless
the option to send duplicate hits is selected in the Badge Server software. If the option is
selected, a badge may appear to bounce back and forth as long as it is in an overlap condition.
This increases the traffic on the system and it is not recommended that the option be selected.