Oki B 6500 - Manual (Page 38)

B6500 Network Guide> 38
Specifying 2 sided Printing
The following parameters can be specified:
NOTE
> If several parameters are specified in one "lpr" command,
data may not be printed correctly.
> The system default is used if no parameter is specified.
> If the print data specifies 2 sided or 1 sided printing, the
specification by the data becomes valid and overrides that
by -C option.
PARAMETER DESCRIPTION
DUP/dup 2 sided printing as follows:
TUMBLE/tumble 2 sided printing as follows:
SIMP/simp 1 sided printing