NEED Manual for API P325 microstep drive

Hello group, I have some of these drives (API P325), but seem unable
to locate any documentation, owners manual, ???, from the internet.
There are switches to set for current and microsteps / step, and who
know what else! The switches are internal to the drive's enclosure,
there is no silkscreened information for these switches. Anyone with
information please help!

Thanks
Stan, KO6YB