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ptu46 implements the driver and node for Directed Perception PTU-D46 pan tilt unit. Specifically it was developed on the PTU-D46-17.5. 

Specs: http://www.dperception.com/products/ptu-d46/ptu-d46-17/Specifications/

The driver send commands to the PTU using arbitrary "count" units, which the driver converts into radians. 

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