Intermec Janus 2050 User Manual page 391

JANUS 2050 Vehicle-Mount Computer User's Manual (4MB)
downline
When devices are connected to a computer, they are connected in a "line."
Downline is a direction relative to the computer. If more than one computer is
connected in a line, the upline computers usually handle data processing and
the downline computers usually handle data collection and sometimes some
data preprocessing. Contrast with upline.
DRAM
Abbreviation for dynamic random access memory. A type of RAM that stores
information in integrated circuits containing capacitors. Since capacitors lose
their charge over time, DRAM boards include logic to recharge, or "refresh,"
the RAM chips continuously. Since their internal circuitry is simple, DRAMs
are more commonly used than static RAMs, even though they are slower.
DRAM can hold approximately four times as much data as a static RAM chip
of the same complexity. The JANUS 2050 has 4MB of battery-backed DRAM.
drive
An electromechanical device that reads from and writes to disks. The three
types of common disk drives are floppy disk drives, hard disk drives, and PC
card drives.
driver
See device driver.
EAN
European Article Numbering. International standard bar code for retail food
packages corresponding to the Universal Product Code (UPC) in the United
States. A device that is configured to decode EAN bar codes can decode UPC,
but the reverse is not true. UPC code is a subset of EAN code.
edge triggering
A scanner trigger configuration that makes the laser turn on after you pull the
trigger and stay on until you pull it a second time. Simply releasing the trigger
does not turn the laser off. If the laser is left on, the scanner timeout turns the
laser off. Contrast with level triggering.
EMM
Expanded Memory Manager. Software that makes expanded memory available
to EMS-compatible DOS programs.
end device
The device in the data collection system that collects and inputs data.
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