User's Manual

5
Classification of RF Obstructions
RF signals will encounter two types of obstructions that either weaken or
reflect the signal, depending on its material composition. The first type of
obstruction is one that allows the signal to pass through, but attenuates, or
weakens it. Some examples include walls constructed of wood, drywall,
human body, and concrete block. The amount of attenuation is proportional to
the total thickness of materials that must be penetrated by the RF signal
traveling the line-of-sight path. The second type of obstruction is one that
reflects the RF signals, allowing little or none to pass through. Any type of
metallic substance falls into this category. This includes objects such as
stainless steel food preparation areas, walk-in freezers, steel doors, and steel
support beams.
The greater the distance between the USB dongle and the bump bar, plus the
greater the number of obstructions between the two devices may allow
extraneous RF devices to impact the operation of the bump bar.
LED Status Indicator
The BB-3000W bump bar is provided with a LED status indicator for you to
read the system operation status. The LED status is described below.
LED Status
Description
Solid green about for 5 seconds
Batteries are loaded into the bump bar.
Flash red
The batteries are running low.
Flash green once
The bump bar receives an acknowledge
signal from the USB dongle.
(When a key of the bump bar is pressed, a
data signal is transmitted from the bump
bar to the USB dongle; then the USB
dongle transmits an acknowledge signal to
the bump bar.)