HP Color LaserJet 5500 Technical Reference Manual page 97

Example: Modifying
This example sets page protection to LETTER for all
personalities, and selects the PC8 symbol set for all PCL
User Default Settings
jobs. A RESET command follows the DEFAULT commands
so that the PJL Current Environment defaults to the new
settings.
<ESC>%-12345X@PJL <CR><LF>
@PJL COMMENT User Defaults <CR><LF>
@PJL DEFAULT PAGEPROTECT = LETTER <CR><LF>
@PJL DEFAULT LPARM : PCL SYMSET = PC8 <CR><LF>
@PJL RESET <CR><LF>
<ESC>%-12345X
Related Commands:
RESET, SET, JOB, EOJ, UEL
Environment Commands 6-35