question for Mariss

good day all,

just looking into wiring my servos to these new gecko g320 drives
and i have a few questions.

when i review the documentation for the drives, your specification
page refers to a +5vdc ,but on the physical drive itself that
particular position says "common" what does this mean?
i also downloaded a wiring schematic created by Donald Brock
that outlined a typical gecko g320 mock-up. here he has the +5vdc
from the computer hooked up to the corresponding +5vdc/common
position on the drive.
can this position be +5vdc or ground ?
do you know what pins and ports will provide +5volts?

thanks for you help.