7
IRRITROL Decoder Systems
Star configuration
The figure shows a typical star installation. The
interface has multiple 2-wire terminal sets and
it is recommended to pull more 2-wires from
the interface to the field. This serves an easier
troubleshooting for e.g. shorts as the wires can be
tested one at the time.
It is important to be aware of the critical path
which is the cable distance to the farthest end.
This may never exceed the specification for the
cable used, see below.
Loop configuration
The figure shows a typical loop installation. The
interface has multiple 2-wire terminal sets, but it
is recommended to loop the wire back to the same
terminal set especially if more loops are used. It is
important to use color coded wire and make sure
all splices along the wires are kept the same; i.e.
black to black, red to red.
In case of troubleshooting e.g. short on the 2-wire
it is important to open the loop either at the
interface or somewhere along the 2-wire.
It is important to be aware of the critical path
which is the cable length of the entire loop. This
may never exceed the specification for the cable
used, see below.
In general, it is recommended to use star over
loop for easier installation and troubleshooting.
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