Tektronix Phaser 220e Reference Manual page 21

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Before You Begin
About Control-D characters in PC utility files
The utility Þles on the Printer Utilities diskette all begin and end with
Control-D characters. If your computer is connected to the printer through a
parallel or serial port, you need to leave these characters in the Þles.
However, if your computer is connected to an Ethernet network such as
Novell NetWare or TCP/IP, you should delete the Control-D characters from
each utility Þle you plan to use. Refer to Chapter 8, ÒModifying Printer
Operation,Ó for instructions on adding and deleting Control-D characters in
utility Þles.
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Printing Reference