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System Requirements
Certain prerequisites have to be
fulfilled before the BDA or BDA
Plus can be operated. One of the
two standard browsers (Internet
Explorer V5.5 or higher or Netscape
Navigator V6.2 or higher) must be
installed on the output device (e.g.
laptop). Compatibility with other
browsers cannot be guaranteed.
To ensure independence between
the operating systems and browsers,
all the pages have been written in
HTML code and Java applets. A
Java Virtual Machine is required
to display the pages.
What is Java?
Java is a platform-neutral object-
oriented programming language
originally developed by Sun
Microsystems. Java is implemented
in all IT areas of the commercial,
industrial and administrative
sectors, and is available free of
charge for many operating systems
and platforms - from cell phones
to real-time mainframe systems.
Unlike most compiler languages,
Java applets are not directly
translated into a set of commands
that can be understood by a "Real
Processor." Instead, they are first
converted to the "Java Byte Code."
Although this byte code is highly
machine-oriented, a "Java Virtual
Machine" (VM), which emulates a
standardized processor for all Java
applets, is required on the target
computer.
Since Java normally compiles data
twice (once with the developer and
once with the user), this principle
is known as the "Just-In-Time" (JIT)
Compiler. Although, Java applets
take longer to start, since the
machine code is generated during
initialization.
WL PROFIBUS Communication and Electronic Accessories • July 2004
However, the same Java applet
can run on all supported systems
without modifications.
The Java Virtual Machine V2
V1.4.0_01 is required to display
the BDA pages. When these pages
are called up for the first time, the
BDA checks whether Java VM2 is
available on the browser. If not,
the system automatically displays
a window informing the user of
this and automatically links the
user to the appropriate Sun
Microsystems page. An Internet
connection must be established to
ensure the automatic installation
procedure functions properly. If this
is not the case, the Virtual Machine
required for the Microsoft Windows
operating systems can be
downloaded from the following
address:
http://java.sun.com/products/archive
/j2se/1.4.0_01/index.html
Once installed, the option Java 2VM
V1.4.0_01 must be activated in the
browser (if it is not already).
To avoid conflicts with other Java
versions, it is recommended that
you uninstall older versions of Java
and delete the cache in the browser.
The target system with the browser
also requires one or both of the
following communication
interfaces:
• A serial interface with RS232
design, usually integrated on
standard PCs (e.g. COM1)
for point-to-point (PPP)
communication with the BDA.
• A LAN interface for
communicating with the BDA
Plus via the Ethernet.
Breaker Data Adapter (BDA)
WL Circuit Breaker
Circuit breaker requirements
The BDA can be connected to WL
Circuit Breakers with the following
trip units: ETU745, ETU748, ETU755
and ETU776. It can be connected
either directly to the trip unit or
to the last external CubicleBUS
module. Circuit breakers can also
communicate with the BDA if they
have been retrofitted with the
communication function.
Getting started with the BDA Plus
If the BDA Plus is is being installed
for the first time, the settings for
the IP address and the standard
gateway as well as the subnet
mask must be set using the serial
communication via RS232. After
this the BDA Plus must be rebooted
to load the Ethernet driver with the
specified parameters.
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