HP Color LaserJet 5500 Technical Reference Manual page 118

Parameters:
7-10 Status Readback Commands
Note
The supported variables and range of values for each
variable may not be the same in all PJL printer models. See
Appendix A for a list of valid variables for each printer, or
send the @PJL INFO VARIABLES command to request this
information directly from the printer.
value — This parameter is the returned value of the
requested variable. For example, if you sent the
DINQUIRE LOWTONER command, the returned value
is either ON or OFF (or CONTINUE/STOP), indicating
whether or not you want the printer to stay online when
the toner is low. See Appendix A for valid variable values.
Parameter
personality
port
variable
value
Variable Names
PCL
POSTSCRIPT
PARALLEL
SERIAL
Valid variables for each printer are listed
in Appendix A.
Acceptable values for each variable are
also listed in Appendix A.
ESCP
(other personalities
may be supported)
Supported on HP
LaserJet 4PJ only