- Hewlett-Packard Printer Owner's Manual

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By responding to the Enter Request: message at the end of the main
configuration menu with "5" (Set Printer Select Code), you may
change the Printer Select Code to a user-defined code. The Printer
Select Code consists of any character string from 1 to 8 ASCII
characters.
Print Master will respond with:
Printer Select Code is......................$PRINTER
Enter Printer Select Code
(0 to 8 Chrs, Hit Return)...................:
Enter the new Printer Select Code, followed by <ENTER> or just
<ENTER> for no change.
NOTE:
Non-printable characters are acceptable, but they will not
appear in the Status print-out. If you are using the BayTech utility
software to select printers, be certain to change the Printer Select
Code in the software as well.
Print Master will save the new Printer Select Code permanently in
non-volatile memory and return to the main configuration menu ( see
Section 7.1.1 ).