HP 2500 HP PCL/PJL reference - Printer Job Language Technical Reference Manual - Page 90

Port-Specific Variables (LaserJet 4PJ Only) The following variable is I/O port-specific in the HP LaserJet 4PJ printer, and can be set and requested using PJL. This variable must be set using the IPARM : port option. For the HP LaserJet 4PJ, the valid values for port are SERIAL and PARALLEL. Port-Specific Variables Variables Description Sample Value Range PERSONALITY Personality for implicit switching (implicit PCL, ESCP switching refers to switching to the default personality without explicitly doing so with the @PJL ENTER command). Note that the value string (PCL, ESCP, and so on) for each installed personality is defined by the personality itself. When the personality is changed, memory is reconfigured and all downloaded fonts and PCL macros are lost (however, no I/O data is lost). Refer to "Commands that Affect Printer Memory" in Appendix A. 6-26 Environment Commands EN