- 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 "A" for models 710E and 710F or "9" for
model 710C (Set Unit I.D. Number), you may set the Unit ID number
which is used to determine which unit in the cascaded chain a print
job will be sent to.
NOTE:
Units do not need to be numbered in numerical sequence.
For example, if three Print Master units are being cascaded, they can
be identified as Units 1, 2, 3 or Units 4, 6, 8, Units 1, 6, 9, etc..
However, two units cannot be configured with the same Unit ID
Number.
Print Master will respond with:
Unit Identification Number is..................1
Enter new Unit Number (1 to 9)................:
Enter the desired Unit ID Number. Print Master will save the Unit ID
Number permanently in non-volatile memory and return to the main
configuration menu (see Appendix B.1.3 ).