Oki MC560n User Manual page 227

is [Short Edge]. Choosing [Off] turns off duplex printing
and your document will be printed single-sided.
Windows PCL
1. In the driver's Setup tab, under [2-Sided Printing], select
the binding edge you want.
PCL Duplex_oda.jpg
For portrait (tall) page layout the usual choice is [Long
Edge]. For landscape (wide) page layout the usual choice
is [Short Edge].
Choosing [Off] turns off duplex printing and your
document will be printed single-sided.
A guide to printing > 227