Rockwell Automation 2755 Decoded Hand-Held Scanner - Manual (Page 101)

Glossary
Publication 2755-6.2
A
ASCII
American Standard Code for Information Interchange.
A 7 bit-plus-parity code representing 128 letters, numerals,
punctuation marks, and control characters. It is a standard data
transmission code in the U.S.
B
Bit
Binary digit. One bit is the basic unit of binary information. Generally,
eight consecutive bits compose one byte of data. The pattern of 0 and 1
values within the byte determines its meaning.
Byte
On an addressable boundary, eight adjacent binary digits (0 and 1)
combined in a pattern to represent a specific character or numeric value.
Bits are numbered from the right, 0 through 7, with bit 0 the low-order
bit. One byte in memory can be used to store one ASCII character.
C
CDRH
Center for Devices and Radiological Health. A federal agency
responsible for regulating laser product safety. This agency specifies
various laser operation classes based on power output during operation.
Check Digit
A digit used to verify a correct symbol decode. The scanner inserts the
decoded data into an arithmetic formula and checks that the resulting
number matches the encoded check digit. Check digits are required for
UPC but are optional for other symbologies. Using check digits
decreases the chance of substitution errors when a symbol is
decoded.