5
OVERVIEW OF DUAL
™
DECODER OPERATION
DUAL
™
two-wire decoder technology permits control of irrigation
systems over relatively long distances by attaching waterproof
decoders as needed in a low voltage, direct burial two-wire
path. The wire is cut wherever station control is needed, and the
decoder wires are spliced into the path. The decoders are then
connected to local standard 24 VAC solenoids for individual
operation of valves and similar devices. Each decoder is uniquely
addressed, and both the signal for their address and the power
required for solenoid operation are sent over the single pair of
wires. Up to 48 decoders can be individually operated by the
I-CORE controller over a single pair of wires in this manner.
Decoder Benets
Decoder systems save wire. A signicant benet is the ability
to operate up to 48 stations with only two wires, instead of
approximately 50 wires for conventional installations. This can
also save labor associated with large numbers of individual
wire runs.
Decoder systems are exible. As long as the two-wire path
is accessible throughout an irrigation system, stations can be
added later by inserting additional decoders into the path at any
point, with minimum disruption of turf and landscape. Decoder
wire runs can even be spliced and tee’d to follow pipe trenches,
minimizing wasted wire.
Decoder systems are lightning resistant. While no irrigation
system is immune to lightning, decoder systems have less wire
in the ground and, when properly installed, have excellent
grounding and surge suppression. They are popular in regions
with high lightning exposure.
Decoder systems are relatively easy to program and
troubleshoot. There are only two wires per path and a single
DUAL-M output module for the decoder functions, equipped
with diagnostics. The controller operating system is the same as
a conventional I-CORE, which makes programming easy for those
already familiar with the I-CORE controller.
TwO-wirE pATH
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