RadioRA2, Cartell, And Hall Research HR-4P

Quick question that has been bugging me for a while now.
We have a customer who has a Cartell driveway sensor installed at their house. They also wanted RadioRa2 switches installed to control about half of their total lighting in their house. Some of the zones they have are exterior flood lights and recessed lights. They want the exterior lights to come on when the driveway sensor is triggered and then go off after a set period of time. Would it be possible to use a HR-4P as a communicator to send a signal from the Cartell system to the RadioRa2 system to get it to turn on a light or series of lights?