iTC-5 Wiring

[tonyh1307]

I am connecting a long arm wind vane to an iTC-5. There is a bare wire coming from the wind vane. All of the others are clearly labeled by their color and mostly self explanatory. The only left over, under cable color is "screen." By process of elimination that would be the bare wire but I don't want to break the thing. what is that wire and what is it used for? Do I connect the bare wire to "screen" connection 2?

re page 22 iTC-5 installation, from Long and Short arm wind vane installation instructions. Document 87220-1-EN

Thanks,
tonyh