2.   Press the Item key until you see DUPLEX=ON or DUPLEX=OFF in the       display.
3.   Press the Value + or Value - key until you see the new value you want.
4.   Press the Enter key to select the new setting. An asterisk appears next to       the value, showing that it is active.
5.   To exit menu mode, press the Online key. Notes:
1.   Values set in print jobs (either by the print application or by the printer       driver) override values you set at the printer. If a print job specifies
      simplex printing and the printer default is duplex, the printer honors the
      print job setting and prints on one side only.
2.   The BINDING item on the Paper Menu lets you specify how you want       duplex jobs to print. If BINDING is set to LONG (the default value), the
      job prints as if the paper is to be bound along the long edge of the paper
      (on the left for portrait documents, along the top for landscape
      documents.) If you set BINDING to SHORT, the job prints as if the paper
      is to be bound along the short edge of the paper (on the top for portrait
      documents, on the left for landscape documents.)
3.   Do not print duplex print jobs when the Face-up Output Bin is open. The Face-up Output Bin supports simplex jobs only. If the printer receives a
duplex job when the Face-up Output Bin is open, it stops printing until
the duplex job is canceled or deleted. Defining Custom Form Sizes Situation: You want to define a custom form size. Action: Do one of the following.
v  To define specific form sizes at the operator panel, see “Defining Specific     Form Sizes from the Operator Panel”.
v  To specify custom form sizes from your Windows PCL5 driver or print application, see “Defining Specific Form Sizes from Windows PCL5 Drivers
or Print Applications” on page 52. Note:  Coax and twinax SCS data streams cannot print to trays that are configured for custom paper sizes (CUSTOM, CUSTENV, and
SIZE1-SIZ10). Defining Specific Form Sizes from the Operator Panel
You can define up to ten custom form sizes (SIZE1-SIZ10), which you can
then select for any installed paper tray. You can use the Infoprint 21 to print
any non-standard media size within the following guidelines: Auxiliary  Tray
Width: 50    Infoprint 21: User’s Guide