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This article describes potential uses for ultrasonic range-finding transducers in point of sale (POS) terminals. The use of such transducers for energy conservation and security purposes is discussed.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
81% of the total text.
Page 1 of 1
Ultrasonic Switch/ alarm for POS Systems
This article describes potential uses for ultrasonic range-finding transducers
in point of sale (POS) terminals. The use of such transducers for energy
conservation and security purposes is discussed.
It is proposed that ultrasonic range-finding transducers be incorporated into
POS terminals. The transducers could be used to automatically initiate a power-
up sequence when a person approaches and a power-down sequence when the
last person leaves the terminal area. Since POS terminals are often idle during
normal business operations, automatic power-up/down could provide significant
For security reasons, the POS terminal could be programmed to sound an
alarm if an approaching person fails to perform a predetermined log-on
procedure within a certain period of time after being detected. Similarly, the
terminal could provide an alarm if an operator leaves the area without properly
securing the terminal cash drawer.
The transducer set points could be adjusted under program
control. During normal business hours, the transducer set point
would be adjusted so that power or alarm functions would be initiated
only when a person came close to the terminal. Outside of normal
business hours, the transducer set point could be increased to
initiate an alarm function when a person was sensed at a considerable
distance from the terminal. Since retail establishments typically
include terminals at distributed locations, setti...