Rockwell Automation 2755-G6-D Scanner with RS-232 Option - Manual (Page 98)

Glossary
G–3
hex: Abbreviated form of the word hexadecimal. See
hexadecimal.
hexadecimal: A base-16 numbering system that uses the
symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F.
horizontal bar code: A bar code or symbol presented in a
manner that its overall length dimension is parallel to the
horizon. The bars look like a picket fence.
Interleaved 2 of 5: A symbology in which characters are
paired together using bars to represent odd number char-
acters and spaces to represent even number characters.
ladder orientation: See vertical bar code.
modulus 43 check character: Used in Code 39 for data
security in addition to the built-in self-checking
characters. The check-character is the modulus 43 sum of
all of the character values in a given message and is the
last character in the code.
NAK: See negative acknowledgement.
negative acknowledgement (NAK): An ASCII control
character transmitted by a receiver as a negative response
to the sender.
orientation: The alignment of bars and spaces to the
scanner. Often referred to as vertical (ladder) or
horizontal (picket fence).
parity bit: An additional non-data bit attached to a binary
word to provide a check of the data integrity by making
the sum of the number of ones in a word always even
or odd.
picket fence code: See horizontal bar code.
scan: The search for a symbol or marks which are to be
optically recognized.
scan area: The area intended to contain a bar code
symbol.
scanner: A device that optically scans bar code symbols
and converts the optical information into digital or analog
form and sends it to a decoder.