Konica Minolta Magicolor 2550 Reference Manual page 26

5
Select desired print protocol from the Protocol pop-up menu.
-For an IPP setup, select Internet Printing Protocol - IPP.
-For an LPD setup, select Line Printer Daemon - LPD.
-For a port 9100 setup, select HP Jet Dorect - Socket.
10 Printer Setup Utility Settings