The PC_OCD_DUPLEX_ON box contains the printer command which the Universal Printer Driver issues to enable duplex (double-sided) printing. The Universal Printer Driver will not process the duplex-on command unless the MD_DUPLEX box is checked in the fGeneral dialog box.
The Diconix 150 Plus does not support duplex printing; therefore the PC_OCD_DUPLEX_ON box is empty.
For the HP LaserJet IIP, two separate commands are re-quired to enable duplex printing. One command enables duplex printing in por-trait mode and the other in landscape mode. These commands are entered in the PC_OCD_DUPLEX_VERT and PC_OCD_DUPLEX_HORZ boxes. The PC_OCD_DUPLEX_ON box is empty.