Tray selection on HP5500N

make  a copy  of the current  printer.plt that your  using and  rename  it  hp5500N_tray3.plt

sysprinter /name="printer-name" /form=f /orientation=o /offset=(h,v)/tray=t /fullsheet
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tray
This value can be any valid tray name for the selected printer, such as Tray 1, Manual Feeder, and so on. Where a printer has a choice of trays (or paper sources) you can check the available tray names by clicking the Configure Windows Printer icon in the Print dialog box, which opens the system Print setup dialog box. In this dialog box, you can select the required printer Name and then click Properties to view the printer's properties, including that for paper source.

Some manufacturers have used tray names that contain characters outside the normal ASCII printable range. To handle this case, you can enter a "?" in place of any character and MicroStation will match the actual name. If the tray name contains spaces or `/´, it should be enclosed in single (`) or double (") quotes. If the tray name contains " (double quote) as part of the name, use a single quote pair.

The /tray qualifier is optional. If omitted, the Windows default setting for the named printer will be used.
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so find out the tray name or number and edit your hp5500N_tray3.plt so the .Tray= tray name or  number..

then use this  modified printer.plt to plot to tray  3..

Lorys