Specifications

Niagara Release 2.3
Niagara Networking & Connectivity Guide
GL-6
Glossary
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enterprise LAN connectivity. Since a station database is made using Java objects, it
can easily run on multiple platforms ranging from a network computer that supports
embedded systems to a desktop server platform that integrates multiple systems.
JACE-NP The JACE-NP is the first of the JACE controller platforms, essentially a compact PC
platform with an integral hard drive, but no keyboard, mouse or monitor. It uses
either Windows NT 4.0 Workstation or Embedded Windows NT 4.0 as its operating
system. The JACE-NP is designed for panel mounting in mechanical room or factory
floor applications.
JACE-4/5 Refers to a JACE-4 or JACE-5 series controller. Each uses the Wind River VxWorks
operating system and features a compact embedded processor platform with flash
memory for backup.
JDE Java Desktop Environment. The graphical engineering tool for creating Niagara
station databases (formerly WorkPlace Pro).
Java applet A Java program designed to be run from within another application (cannot run
standalone from the operating system). The Niagara WebUIService includes a
number of Java applets accessible from a browser, for example, GxPage graphics, log
charts, and schedule and calendar editors. These applets are “served up” by the
various WebUIService servlets.
JVM or Java virtual
machine
The Java virtual machine is a self-contained operating environment that behaves as
if it were a separate computer. It acts as the bytecode interpreter and runtime
environment for Java applets, which are not given any direct access to the host
operating system. This design has two distinct advantages: system independence and
security.
Java applications are platform independent because they run the same in any JVM
regardless of the hardware and software underlying the system. In addition, because
the JVM has no direct contact with the operating system, there is little possibility of
a Java applet damaging other files or applications.
K
L
LAN Local area network. A group of computing devices (such as PCs, servers, and
printers) that are connected together in a fairly concentrated geographic area (such as
a floor of a building or several buildings). See also WAN .