Motorola MC7090CN User Manual page 112

Glossary - 2 MC7090CN User Guide
BIOS. Basic Input Output System. A collection of ROM-based code with a standard API used to interface with
standard PC hardware.
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.
Bits per Second (bps). Bits transmitted or received.
BOOTP. A protocol for remote booting of diskless devices. Assigns an IP address to a machine and may specify
a boot file. The client sends a bootp request as a broadcast to the bootp server port (67) and the bootp
server responds using the bootp client port (68). The bootp server must have a table of all devices,
associated MAC addresses and IP addresses.
boot or boot-up. The process a computer goes through when it starts. During boot-up, the computer can run
self-diagnostic tests and configure hardware and software.
bps. See Bits Per Second.
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 is 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.
CDRH Class 1. This is the lowest power CDRH laser classification. This class is considered intrinsically safe,
even if all laser output were directed into the eye's pupil. There are no special operating procedures for this
class.
CDRH Class 2. No additional software mechanisms are needed to conform to this limit. Laser operation in this
class poses no danger for unintentional direct human exposure.
Character. A pattern of bars and spaces which either directly represents data or indicates a control function,
such as a number, letter, punctuation mark, or communications control contained in a message.
Character Set. Those characters available for encoding in a particular bar code symbology.
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.
Codabar. A discrete self-checking code with a character set consisting of digits 0 to 9 and six additional
characters: ( - $ : / , +).
Code 128. A high density symbology which allows the controller to encode all 128 ASCII characters without
adding extra symbol elements.