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G
LOSSARY
5
Solutions with Vision
Dot Matrix Printer
A dot matrix printer is an impact printer that consists of a series of pins arranged in an array. The pins strike an inked ribbon
against the label stock to form the bar code and characters. This is the most common type of printer used to print labels on-
demand. Some dot matrix printers use a moving print head and stationary stock. The print head moves across the label, printing
one dot at a time, to complete one line. The print head then begins printing the next line. Other dot matrix printers use a
stationary print head. These printers typically print one line at a time and are therefore much quicker than a printer with a moving
print head.
Common Problems with dot matrix printing
The printed ink (bars) tends to expand or “bleed”. This causes the size of the bars of a code to expand while shrinking the spaces.
There tends to be small gaps between pins of a dot matrix printed bar. This can lead to problems with scanners because these
gaps can appear as spaces. Ribbon wear is a factor when printing dot matrix codes. If a printer uses a circular type ribbon (ribbon
is used over and over again) the contrast of the bar code diminishes over time. A bar code printed with an old ribbon can be more
difficult to read than one printed with a new ribbon.
Benefits of dot matrix printing
It is inexpensive to print bar codes using dot matrix printers.
Downloading
The process of sending configuration parameters, operating software or related data from a central source to remote stations.
DSR (Data Set Ready)
An RS232 modem interface control signal which indicates that the terminal is ready for transmission.
DSR (Data Terminal Ready)
Modem interface signal which alerts the modem that the DTE device is ready for transmission.
Duplex Transmission
See Full and Half Duplex.
EAN
European Article Number System. The international standard bar code for retail food packages.
EDI (Electronic Data Interchange)
A method by which data is electronically transmitted from one point to another.
EIA-232
Interface between data terminal equipment and data communication equipment employing serial binary data interchange.
EIA-422
Electrical characteristics of balanced-voltage digital interface circuits.
EIA-485
The recommended standard of the Electronic Industry Association that specifies the electrical characters of generators and
receivers for use in balanced digital multipoint systems.
Element
Dimensionally the narrowest width in a character - bar or space.
Element width
The thickness of an element measured from the edge closest to the symbol start character to the trailing edge of the
same element.
Encoded area
The total linear dimension consisting of all the characters of a code pattern, including start and stop characters and
data.
ENQ (Enquiry)
A transmission control character used as a request for a response from a remote station. (^E)
ESC (Escape)
A control character which is used to provide additional control functions. It alters the meaning of a limited number of
continuously following bit combinations. (^[)
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