Specifications

quiet zone—The left and right margin spaces at the beginning and end of a bar code.
No dark print is located in these areas.
ragged type—Type that is flush to either the left or the right margin but not to both.
RAM—Acronym for Random access memory, semiconductor memory that can be
read and changed during microcomputer operation. RAM is volatile, so all data is
lost when power is down.
raster—Line pattern traced by rectilinear scanning in display systems.
reflectance—Ratio of the amount of light of a specified wavelength reflected from a
test surface to the amount of light reflected from a barium oxide or magnesium
oxide standard under similar lighting conditions.
repeatability—An instrument’s ability to produce the same output repeatedly under
identical conditions.
RJ-11—A telephone-type connector used to connect the Hand-Held Terminal to the
PA/4000
RJS—Manufacturer of bar code verifiers.
ROM—Acronym for Read Only Memory, semiconductor memory containing fixed
data that cannot be changed once programmed in manufacture.
RS-232—Serial communication standard employed by personal computers. It defines
three types of connection: electrical, functional and mechanical—usually used with
25 or 9-pin D-shaped connectors.
sensor—Device that produces an electrical output that corresponds to a physical
input.
serial data transmission—Most common method of sending data from one data
terminal to another. To transmit data serially is to transmit it one bit at a time over
a single channel.
slew rate— The rate at which unprinted label stock advances when no printing is
taking place.
software—Set of programs that direct a computer. Common types of software
include programming language interpreters and compilers; word processing and
page layout programs; electronic spreadsheets; and database management
programs.
SOH ASCII— control code for Start Of Header: a signal that specifies the beginning
of a transmission (Hex. 01).
space—The lighter element of a bar code formed by the background between bars.
STX—ASCII control code for Start of text: a signal that specifies the beginning of a
text string (Hex. 02).
substrate—Surface that receives ink or a label.
symbol—A combination of characters, including start/stop characters and check
characters, as required, which form a complete scanable entity.
symbol length—Length of the symbol in a bar code measured from the beginning of
the quiet area adjacent to the start character to the end of the quiet area adjacent to
the stop character.
Tamp-Pad—A rubber pad with holes in it used to provide a backing surface for the
label as it is applied.
thermal printing—Printing technology that uses rapidly-heated pins to activate a
heat-sensitive coating on a face material; the selectively-heated areas darken and
form characters and pictures.