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Introduction
890USE17700 April 2004 17
Preferred
Modules
An island bus can also support those auto-addressable modules referred to as
preferred modules. Preferred modules do not mount in segments, but they do count
as part of the 32-module maximum system limit.
A preferred module can connect to an island bus segment via an STB XBE 1000
EOS module and a length of STB XCA 100x bus extension cable. Each preferred
module has two IEEE 1394-style cable connectors, one to receive the island bus
signals and the other to transmit them to the next module in the series. Preferred
modules are also equipped with termination, which must be enabled if a preferred
module is the last device on the island bus and must be disabled if other modules
follow the preferred device on the island bus.
Preferred modules can be chained to one another in a series, or they can connect
to Advantys STB segments. As shown in the following figure, a preferred module
passes the island bus communications signal from the primary segment to an
extension segment of Advantys STB I/O modules:
1 primary segment
2 NIM
3 STB XBE 1000 EOS bus extension module
4 1 m length STB XCA 1002 bus extension cable
5 preferred module
6 1 m length STB XCA 1002 bus extension cable
7 extension segment of Advantys STB I/O modules
8 STB XBE 1200 BOS bus extension module for the extension segment
9 STB XMP 1100 termination plate
Note: If you want to include preferred modules in your island, you need to configure
the island using the Advantys configuration software.
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