HP LaserJet 8000 Multifunction Printer series - Manual (Page 324)

Appendix D Printer Commands 324
Understanding PCL Printer Command Syntax
Combining Escape Sequences
Escape sequences may be combined into one escape sequence string. There
are three important rules to follow when combining code:
1. The first two characters after the ? character (the parameterized and group
characters) must be the same in all of the commands to be combined.
2. When combining escape sequences, change the uppercase (termination) character
in each individual escape sequence to lower case.
3. The final character of the combined escape sequence must be uppercase.
The following is an example of an escape sequence string that would be sent
to the printer to select legal paper, landscape orientation, and 8 lines per inch:
?&l3A?&l1O?&l8D
The following escape sequence sends the same printer commands by
combining them into a shorter sequence:
?&l3a1o8D