Intermec Janus 2020 User Manual page 537

G
Glossary
IRL Desktop
The IRL operating environment on the JANUS reader is called the IRL
Desktop. This application lets you use the reader to transmit, receive, and clear
data files, and to download and run IRL programs.
IRQ
Interrupt request. Hardware lines over which devices such as the reader's
input/output ports, the keypad, and disk drivers can send request-attention
signals (commonly called "interrupts"). IRQs suspend current operations, save
current work, and transfer control to a routine called an interrupt handler,
which causes a specific set of instructions to be carried out by the computer's
microprocessor.
keypad buffer
An area of memory that saves a limited number of operator keystrokes.
keypad clicker
A feature that makes the reader produce an audible click every time a key is
pressed. This feature can be enabled or disabled with the Keypad Clicker
configuration command.
large numeric keypad
One of the keypads available on the reader. The large numeric keypad has 34
keys and is available in English. The number keys are larger to make it easier
to enter a lot of numeric data. See also alphanumeric keypad.
laser scanner
An optical bar code reading device that uses a low energy laser light beam to
examine a spatial pattern, one part after another. It then generates analog or
digital signals corresponding to the pattern. Laser scanners are often used in
mark sensing, pattern recognition, character recognition, and bar code
recognition. The laser scanner converts bar code symbols to electrical signals
for input to a bar code reader decoder for processing and subsequent output
through a data communications interface.
level triggering
A scanner trigger configuration that makes the laser turn on after you pull the
trigger and stay on until you release the trigger. Contrast with edge triggering.
lithium backup battery
The reader contains a lithium backup battery that is designed to back up the
RAM and clock while you remove a discharged NiCad battery pack and insert
a charged battery pack. The lithium battery will provide backup battery power
for 3 to 4 years if you correctly manage power on the reader.
G-15