Rockwell Automation 2755 Undecoded Hand-Held Scanner - Manual (Page 32)

Glossary
Publication 2755-6.1
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.