the alignments it wants as Land XML
the surfaces it may take them as XML, however the manual seems to indicate it wants
a TIN for the surface however that is from a 2006 version of the manual found online.
So alignments XML
surfaces maybe XML - or you may need to extract the triangles and export using DXFOUT
feature lines - (from other students) need to be exported as 3d lines (EXPORT to AUTOCAD AKA AECOBJEXPLODE)
As topcon has their onlind help section Password Locked, I am restricted from searching further. This seams to be a stupid choice to me on their part.