Dell 5110cn Color Laser Printer - Manual (Page 394)

Envelope
If this option is not specified, multipurpose feeder Paper Type of the printer can be used.
-Mfo=mode
Specifies orientation for multipurpose feeder.
Available orientations for multipurpose feeder are as follows.
le
Landscape
ler
Landscape (Rotated)
se
Portrait
ser
Portrait (Rotated)
-Pon
Specifies Alternate Tray.
Available Alternate Trays are as follows.
0
Use Printer Settings
1
Display Message
2
Feed from multipurpose feeder
3
Use Nearest Size (Adjust to Fit)
4
Use Larger Size (Adjust to Fit)
5
Use Nearest Size (No Zoom)
6