Glossary
User’s Manual 247
• Signal conditioning circuit - transforms optical detector
output into a digitized bar pattern.
SDK
Software Development Kit.
Symbol
A scannable unit that encodes data within the conventions of a
certain symbology, usually including start/stop characters, quiet
zones, data characters and check characters.
Symbology
The structural rules and conventions for representing data within a
particular barcode type (e.g. UPC/EAN, Code 39, PDF417, etc.).
Toggle key
Pressing a toggle key activates the state. The state remains active
until the toggle key is pressed again.
USB
Universal Serial Bus. Type of serial bus that allows peripheral
devices (disks, modems, printers, digitizers, data gloves, etc.) to be
easily connected to a computer. A "plug-and-play" interface, it
allows a device to be added without an adapter card and without
rebooting the computer (the latter is known as hot-plugging). The
USB standard, developed by several major computer and
telecommunications companies, supports data-transfer speeds up
to 12 megabits per second, multiple data streams, and up to 127
peripherals.
Visible Laser Diode (VLD)
A solid state device which produces visible laser light.
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