HP Color LaserJet Enterprise CM4540 MFP - Software Technical Reference

The Orientation group box contains the following options:
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Portrait. The top edge of the document is the shorter edge of the paper.
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Landscape. The top edge of the document is the longer edge of the paper.
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Rotate by 180 degrees. This creates a landscape or portrait orientation in which the image is
rotated 180°. This setting is useful for printing prepunched paper.
You can toggle orientation between portrait and landscape by clicking the document preview image. If
you select the Rotate by 180 degrees check box, no change occurs in the document preview
image.
102 Chapter 4 HP PCL 6 print driver for Windows ENWW