HP 510 - Manual (Page 177)

Graphics language and networks
For system administrators
If you are using the printer with a network spooler, consider having your system administrator modify the spooler
to insert the
PJL language-switching commands automatically at the beginning and end of each file. This allows
the printer to switch automatically into the correct graphics language for your current print and returns the printer
to the front-panel
graphics language setting for subsequent prints.
For information on ordering PJL reference information, see Ordering accessories .