Extend Z Wave Via Cable?

We have a project where we want to install 4 thermostats in various locations in an 18,000 square foot building. The alarm panel will be DSC Neo using the ADC platform. The thermostat is also ADC.

Is there any way to get these thermostats connected without having to install multiple repeaters? I was hoping to be able to use some device at both ends that we could connect via cable.

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