ADLINK PCI-8164 - Manual (Page 95)

Operation Theory 83
axis 1) and ZU (axis 2 and axis 3). By calling these functions, the
target axes are already assigned.
_8164_start_r_arc_xy(), _8164_start_r_ arc _zu(),
_8164_start_a_ arc _xy(), _8164_start_a_ arc _zu(),
(Refer to section 6.8)
The second group allows user to freely assign any targeted two
axes.
_8164_start_r_arc2(),_8164_start_a_arc2(): Refer to section 6.8