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

EN Status Readback Commands 7-5
INQUIRE Command
The INQUIRE command is used to obtain the current value of a
specified PJL environment variable, including read-only variables.
Use the INQUIRE command to find out the setting for a particular PJL
feature, such as ORIENTATION.
Syntax:
@PJL INQUIRE [LPARM : personality |
~IPARM : port] variable [<CR>]<LF>
Response Syntax:
@PJL INQUIRE [LPARM:personality |
~IPARM:port] variable <CR><LF>
value <CR><LF>
<FF>
• LPARM : personality — This optional parameter is used to
inquire about printer language-specific environment variables.
For example, you can use this option to request the current
PCL symbol set stored in the PJL Current Environment.
PCL is a valid personality. Other personalities, such as
POSTSCRIPT, can be added as hardware options. Use the
@PJL INFO CONFIG command to request the personalities
installed in a particular printer.
• IPARM : port — This optional parameter is used to set
port-specific variables. The HP LaserJet 4PJ is the only printer
which supports port-specific variables.
The IPARM : port option must be used when setting
port-specific variables. Valid values for port for the HP
LaserJet 4PJ printer are SERIAL and PARALLEL.
• variable — This parameter specifies the environment variable
you want. For example, the INQUIRE RET command requests
the current value of the Resolution Enhancement technology
feature. See Appendix A for a list of valid variables for each
printer. If you require a more detailed description of a
particular variable, see the “Environment Variables” section in
Chapter 6.