CONTENTS
USER’S MANUAL
93
CDRH
Center for Devices and Radiological Health. A federal agency responsible for regulating
laser product safety. This agency specifies various laser operation classes based on
power output during operation.
Character
A pattern of bars and spaces which either directly represents data or indicates a control
function, such as a number, letter, punctuation mark, or communications control con
-
tained in a message.
Decode
To recognize a barcode symbology (e.g., Codabar, Code 128, Code 3 of 9, UPC/EAN, etc.)
and convert the content of the barcode scanned from a visual pattern into electronic
data.
Density (Barcode Density)
The number of characters represented per unit of measurement (e.g., characters per
inch).
Depth of Field (DOF)
The portion of a scene that appears acceptably sharp in the image. Although a lens can
precisely focus at only one distance, the decrease in sharpness is gradual on each side of
the focused distance, so that within the DOF, the unsharpness is imperceptible under
normal viewing conditions.
Dock
A dock is used for charging the terminal battery and for communicating with a host
computer, and provides a storage place for the terminal when not in use.
ESD
Electro-Static Discharge
Ethernet
The standard local area network (LAN) access method. A reference to "LAN", "LAN con-
nection" or "network card" automatically implies Ethernet. Defined by the IEEE as the
802.3 standard, Ethernet is used to connect computers in a company or home network
as well as to connect a single computer to a cable modem or DSL modem for Internet
access.
Firmware
A software program or set of instructions programmed on a hardware device. It pro-
vides the necessary instructions for how the device communicates with the other com-
puter hardware. Firmware is typically stored in the flash ROM of a hardware device.
While ROM is "read-only memory," flash ROM can be erased and rewritten because it is
actually a type of flash memory.
Flash Memory
Non-volatile memory for storing application and configuration files.
GSM
Global System for Mobile communication. It is a standard for digital cellular communi-
cations, currently used around the world on as many as seven bands.
To Next Page
Loading...
