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Crestron Tutorial: Crestron SIMPL Windows Control Symbols
versus Signals
Unfortunately, this tutorial has to get dry at some point. Well,
here it is... Crestron programming employs things called Symbols
and Signals.
Symbols
Symbols are graphical representations of devices or functions.
That is, a Crestron symbol could represent anything from a simple
AND gate to a complex set of functions for an LCD Projector.
These symbols are grouped into the categories of Analog, Digital
and Serial. Special manufacturer authored symbols are available
for certain products.
Signals
Signals are used as paths between Symbols. Imagine
them like wires from one contact on an integrated chip to another
contact on another chip. You create Signals by entering
text at the appropriate place on a Symbol. Signals cannot
contain empty spaces so if you type a space, then SIMPL Windows
will enter an underscore for you.
Crestnet
While Crestnet is not related to either symbols or signals,
I thought that I'd explain it a little here. Crestnet is a four
wire communication wiring. Two wires are DC power and the other
two are communications. It is essentially RS422 that can run
further. I think it can run up to 5000 feet or so.
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