Glossary - 6 Symbol LS3578 Product Reference Guide

Print Contrast Signal (PCS). Measuremen t of the co nt ra st (b rig ht ne ss dif ference) between the bars and spaces of a
symbol. A minimum PCS value is needed for a bar code symbol to be scannable. PCS = (RL - RD) / RL, where RL is
the reflectance factor of the background and RD the reflectance factor of the dark bars.
Programming Mode. The state in which a scanner is configured for parameter values. See Scanning Mode.

Q

Quiet Zone. A clear space, containing n o dark marks, which pr ecedes the start character of a b ar code symbol and follows
the stop charac te r.
QWERTY. A standard keyboard commonly used on North American and some Euro pean PC keyboards. “QWERTY” r efers
to the arrangement of keys on the left side of the third row of keys.

R

Reflectance. Amoun t of ligh t returned from an illuminated surface .
Resolution. The narrowe st element dimension which is distinguished by a particul ar readin g de vice or printed with a
particular device or method.
RF. Radio Frequency.
RS-232. An Electronic Industrie s Association (EIA) standard that defi nes the connector, connector pins, and signals used to
transfer data serially from one device to another.

S

Scan Area. Area intended to contain a symbol.
Scanner. An electronic device us ed to scan bar code symbols and p roduce a digitized pa ttern that correspo nds to the bars
and spaces of the symbol. Its three main components are: 1) Light source (laser or photoelectric cell) - illuminates a bar
code,; 2) Photodetector - registers the difference in reflected light (more light reflected from spaces ); 3) Signal
conditioning circuit - transforms optical detector output into a digitized bar pattern.
Scanning Mode. The scanner is energized, programmed and ready to read a bar code.
Scanning Sequence. A method of programming or config uring parameters for a bar code reading system by scannin g bar
code menus.
Self-Checking Code. A symbology that uses a checking algorithm to detect encoding errors within the characters of a bar
code symbol.
Space. The lighter element of a bar code formed by the background between bars.
Specular Reflection. The mirror-like dire ct reflection of light from a surface, which can cause difficulty decoding a bar code.