User's Manual

Versus Technology, Inc.
16 Versus Information System
3.3.2.4 Sensor Spacing Coverage
A technique for spacing sensors more then 30 feet apart may be effective for long hallways
and for big rooms. This technique is primarily used for equipment tracking applications. The
technique uses the idea that when a tag enters a location zone, it is there until it leaves that
location zone. The VIS system can map many sensors to the same location zone (see the
example sensor layout below for sensor spacing greater then 30 feet). The sensor spacing is
critical for knowing where the tag is located. You will see areas in the hallways and in the big
room where there is no sensor coverage. However, the system layout was designed to pick up
the badge as it enters and leaves location zone areas.
3.3.2.5 Sunlight Interference
If a room has windows that allow a large amount of sunlight to enter the room, place the
sensor in a position where the sunlight does not hit it directly or reflect into it from objects in
the room. Sunlight can decrease sensor range and field of view if allowed to enter the sensor.
Window tint films that block infrared (heat) energy greatly reduce this effect.
3.3.2.6 Plasma Screen IR Interference
The VIS locating system utilizes infrared (IR) light with a wavelength of approximately 880
nanometers. Versus IR sensors “read” IR badge signatures by detecting digitized IR light