Datalogic JoYa A6 Touch User Manual page 209

Glossary
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.
Firmware
A software program or set of instructions programmed on a
hardware device. It provides the necessary instructions for how the
device communicates with the other computer 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.
Host
A computer that serves other mobile computers in a network,
providing services such as network control, database access, special
programs, supervisory programs, or programming languages.
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