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Automatic Identification Manufacturers organisation supported by manufactures and suppliers of automatic identification products and services.

American National Standard Institute is a non-governmental organisation responsible for the development of standards such as manufacturing.

Character set for the American Standard Code for Information Exchange encoding 7-bit characters (8 bit with parity).

Aspect Ratio
The ratio of bar height to symbol length.

Capability of reading and decoding more than one bar code symbology in a single piece of equipment.

Area surrounding a bar code including quiet zone and spaces.

The darker (black) element of a bar code symbol.

Bar Code
An array of parallel bars and spaces encoding information. Also see Symbol.

Bar Length
The bar dimension perpendicular to the bar width

Bar Width
The thickness of a bar measured from the edge closest to the symbol start character to the trailing edge of the same bar.

A Charge Coupled Device is a bar code scanner which senses the light and dark areas of a symbol.

Check Digit
A character included within a symbol which used to perform a mathematical check to ensure the accuracy of the scanned data.

A numeric only bar code consisting of seven black and white bars. Two bars are wide (Code 27).

Code 39
A full alphanumeric bar code consisting of nine black and white bars. Three bars are wide (Code 3 of 9). Code 39 is the most frequently used symbology in industrial bar code systems today.

Code 128
A full alphanumeric bar code capable of encoding all 128 ASCII characters.

Code 16K
Multi-row (stacked) code in which each symbol can have between two and sixteen rows or stacks. >Each row is separated by a one module separator bar, and consists of 18 bars and 17 spaces. >The code is analogous to sentences in a paragraph.

Value of the opposing magnetic intensity that must be applied to a material to remove the residual magnetism when it has been magnetised to saturation.

Characters per second.

Cathode Ray Tube. Also called a terminal or monitor.

Data Matrix
Variable size two dimensional matrix symbology that is inherently omnidirectional. Data Matrix has a high degree error correction capability and is used primarily for part marking and tracking.

A software or hardware means of translating bar codes into alphanumeric data. A bar code reader is required to scan the information into the decoder.

The term used to designate the compactness of a bar code which measures the narrowest element (usually in mils) of that bar code.

Depth of Field
The distance between the maximum and minimum plane in which a bar code reader is capable of reading symbols.

Direct Thermal
A process in which a set of pins on a printhead are selectively heated onto heat-sensitive paper (or label stock). In turn, the paper turns dark and a bar code is formed. Over time, a Direct Thermal image will eventually fade. Also known as Thermal Printing.

Dots per inch.

EAN is a voluntary, non-profit standards development association active in numbering, bar coding, and EDI messages for products, services, utilities, and transport units and locations. The EAN system is fully compatible with the Universal Product Code (UPC).

Federal Communication Commission.

First Read Rate
The ratio of the number of successful reads to the number of attempts.

Fixed Focus Optics technology utilises a small aperture and non-moving lenses to digitise an image over a wider range of distance than the traditional CCD reader.

A specific size and type of printable character.

Graphical User Interface. The visual design of a software application.

Industrial Article Numbering. See EAN.

Infrared Laser Diode
An invisible light beam used in some bar code readers to scan a bar code that is invisible to the human eye. This technology is used specifically to prohibit people from visually reading the bar code. Analogous to night vision goggles.

Interleaved Bar Code
A bar code in which characters are paired together using bars to represent the first character and spaces to represent the second character. Interleaved 2 of 5 A numeric only bar code consisting of five bars. Two bars are wide, three are narrow. Used generally in industrial and master carton labelling.

Laser Scanner
An optical bar code reading device using a low-energy laser light beam for scanning.

Liquid Crystal Display.

Light Emitting Diode.

Lines per minute.

Fixed size two dimensional symbology having elements arranged around a unique circular finder pattern. MaxiCode is omnidirectional and is primarily used for freight sortation and tracking.

Magnetic Ink Character Recognition style printing on the bottom of personal and bank checks.

1/1000th (0.001) of an inch or approximately 0.0254 millimetre. Bar code densities are commonly referred to as number of mils (i.e. 10 mils).

A condition which occurs when the data output of a bar code reader does not correspond with the data encoded in the bar code symbol.

The narrowest nominal unit of measure in a bar code.

Minimum Reflectance Differential. A method that is used to determine if there is an adequate difference between absorbed and reflected light.

MSI Plessey
Modified Plessey Code is a pulse width modulated bar code used primarily for marking retail shelving. Nominal The ideal value for a specified parameter.

Optical Character Recognition is a technology designed specifically to read certain stylised fonts (such as OCR-A and OCR-B) containing the full alphanumeric character set. The term OCR is also used when translating and inputting other stylised fonts (such as Courier) or text found in magazines and newspapers into a computer. This technology is also referred to as Intelligent Character Recognition (ICR).

Character set used for optical character recognition and described in ANSI Standard X3.17-1981.

Character set used for optical character recognition and described in ANSI Standard X3.49-1975.

Print Contrast Signal is the measurement of the ratio of the reflectivities between the bars and spaces of a symbol.

Two-dimensional bar code providing error correction, detection, and security used primarily in parcel tracking applications and hazardous material control.

Portable Data Terminal. Hand-held terminal capable of storing and recording data that is captured remotely and later transmitted into a computer.

Rotation of a bar code symbol about an axis parallel to the direction of the bars.

Postal Numeric Encoding Technique used to encode ZIP code information on letter mail. PostNet utilises redundant information within a compact bar code format to provide error detection capability and a significant degree of error correction capability.

The device on a direct thermal or thermal transfer printer containing the heating element that causes an image to be transferred to the facestock.

Quite Zone
A clear space, containing no dark marks preceding the start character of a symbol and following the stop character.

Radio Frequency. Wireless communication technology using electromagnetic waves to transmit and receive data. RF provides real-time access to a host computer.

Material used with thermal transfer printers producing visible marks on a label (or substrate). A printhead is heated and the ribbon is burned onto the label stock producing the bar code.

The light which is reflected back from the white spaces of a bar code during scanning. Resolution See Density.

The most common communication interface (e.g. serial (COM) port) standard using a DTE (Data Terminal Equipment) and DCE (Data Communications Equipment) interface. Also known as serial communication.

The second most common communication interface standard which extends beyond the 100 feet limitation of RS-232 data communication supporting a maximum distance of 4000 feet.

Serial Communication
See RS-232.

A device that electro-optically converts bar codes into electrical signals.

Stack Code
Two-dimensional bar code where linear bar codes are stacked one upon another and are printed in a rectangular shape to achieve the most efficient use of label area.

A set of rules, specifications, instructions, or directions for printing, labelling, scanning, etc. bar coded information.

Start-Stop Character
The left-most and right-most characters respectively of a horizontal bar code that provides the scanner with start and stop reading instructions as well as scanning direction.

The surface on which a bar code is printed.

A set of characters and marks including start/stop, quiet zones, data, and check characters required by a particular symbology that form a integrated readable (scannable) element.

See Direct Thermal.

Thermal Transfer
A process in which a set of pins on a printhead are selectively heated onto a ribbon and the ink from the ribbon is burned (transferred) onto the label stock. Thermal transfer leaves a permanent image on the label.

2-Dimensional Bar Code
Two dimensional symbology composed of rows of data arranged in a rectangular or square pattern. The rows of data are stacked onto each other to encode an array of data.

Uniform Code Council is an organisation which administers the UPC and other retail standards.

Universal Product Code is the standard bar code symbol for retail packaging in the United States.

Visible Laser Diode
Used in most hand held scanners to project a visible red light for scanning human readable bar codes.

A device which measures the characteristics of a bar code including the contrast, reflectance, modulation, and compliance with the parameters of the bar code symbology.

A pen-like scanning device used as a contact bar code reader.

A hardware device or software program (Software Wedge) which uses a scanner for input and sends data directly into an application by emulating a keyboard stroke. A wedge (hardware wedge) is an external device and plugs between the keyboard and terminal.

"What You See Is What You Get" is a term used to describe the presentation of the printable output viewed as is on the terminal.

X Dimension
The dimension of the narrowest bar in a bar code.