Specifications

Glossary - 3

Dead Zone. An area within a scanner's field of view, in which specular reflection may prevent a successful decode.

Decode. To recognize a bar code symbology (e.g., UPC/EAN) and then analyze the content of the specific bar code

scanned.

Decode Algorithm. A decoding scheme that converts pulse widths into data representation of the letters or numbers

encoded within a bar code symbol.

Decryption. Decryption is the decoding and unscrambling of received encrypted data. Also see, Encryption and Key.

Depth of Field. The range between minimum and maximum distances at which a scanner can read a symbol with a

certain minimum element width.

Discrete 2 of 5. A binary bar code symbology representing each character by a group of five bars, two of which are

wide. The location of wide bars in the group determines which character is encoded; spaces are insignificant. Only

numeric characters (0 to 9) and START/STOP characters may be encoded.

Discrete Code. A bar code or symbol in which the spaces between characters (intercharacter gaps) are not part of the

code.

DRAM. Dynamic random access memory.

EAN. European Article Number. This European/International version of the UPC provides its own coding format and

symbology standards. Element dimensions are specified metrically. EAN is used primarily in retail.

Element. Generic term for a bar or space.

Encoded Area. Total linear dimension occupied by all characters of a code pattern, including start/stop characters and

data.

ENQ (RS-232). ENQ software handshaking is also supported for the data sent to the host.

ESD. Electro-Static Discharge

Flash Memory. Flash memory is responsible for storing the system firmware and is non-volatile. If the system power is

interrupted the data is not lost.

Hz. Hertz; A unit of frequency equal to one cycle per second.