Microscan MS-4X User Manual download pdf (Page 369)

MS-4X Imager User Manual

A-35

Appendices

Charge-Coupled Device (CCD) — A semiconductor device with an array of light-sensitive

elements that converts light images into electrical signals.

Check Character — A Modulus 43 or Modulus 10 character that is added to encoded

symbol data for additional data integrity.

CMOS — See Complementary Metal Oxide Semiconductor.

Complementary Metal Oxide Semiconductor (CMOS) — Like CCDs, CMOS imagers

include an array of photo-sensitive diodes, one diode within each pixel. Unlike CCDs, however,

each pixel in a CMOS imager has its own individual amplifier integrated inside.

Connector — A plug or socket on a device or cable providing in/out connectivity for various

circuits and pins.

Concentrator

— Intermediary device that relays data from imagers to a host and commands

from the host to the imagers or other devices.

Counter — Memory space allocated to keep track of imager events.

DAC — See Digital-to-Analog Converter.

Daisy Chain — Linkage of primary and secondary imagers allowing data to be relayed up

to the host via auxiliary port connections.

Decode — A Good Read. The successful interpretation and output of the information

encoded in a symbol.

Default — Restores ROM or flash settings, initializes serial commands and resets all

counters.

Delimited — A delimited command or field is bracketed by predefined characters.

Decode Rate — The number of good reads per second ahieved by an imager.

Darkfield Illumination — Lighting of objects, surfaces, or particles at very shallow or low

angles, so that light does not directly enter a reader’s optical hardware.

Depth-of-Field — The in-focus range of an imaging system. Measured from the distance

behind an object to the distance in front of the object with all objects appearing in focus.

Diffused Lighting — Scattered soft lighting from a wide variety of angles used to eliminate

shadows and specular glints from profiled, highly reflective surfaces.

Digital-to-Analog Converter (DAC) — A VLSI circuit used to convert digitally processed

images to analog for display on a monitor.

Digital Imaging — Conversion of an image into pixels by means of an Analog-to-Digital

Converter where the level of each pixel can be stored digitally.

Digital Signal Processor (DSP) — A VLSI chip designed for ultra-high-speed arithmetic

processing. Often imbedded in a vision engine.

Discrete I/O — Inputs and outputs characterized by discrete signal transitions from one

voltage level to another so that digital switching can occur.

Direct Memory Access (DMA)

— A capability provided by some computer bus architectures

that allows data to be sent directly to memory from an attached device.

DMA — See

Direct Memory Access

DSP — See Digital Signal Processor.

Dynamic Range — The difference between the minimum and maximum thresholds of

discernible images; the amount of usable signal.

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Microscan MS-4X User Manual Page 369

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