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

7-12 Status Readback Commands EN

Comments:

If your application has status readback capability, you can request the

default setting of any valid environment variable. The returned value

indicates the User Default Environment value for the feature. Since

the DINQUIRE command returns only the value for one feature, you

must send multiple DINQUIRE commands for data about more than

one feature.

If the printer does not support the variable, the response is:

@PJL DINQUIRE [LPARM:personality | IPARM:port]

~variable <CR><LF>

"?"<CR><LF>

<FF>

If a printer language-specific variable is not available because that

printer language is not installed or is invalid, or if a port-specific

variable is not available because that port is not supported, the

command will return an appropriate error code if USTATUS

DEVICE=VERBOSE is enabled.

Note The LPARM : personality option must be used when requesting

printer language-specific information.

The IPARM : port option must be used when requesting port-specific

information.

Example: Using DINQUIRE to Request Feature

Settings

This example requests the default settings for resolution and

personality. The printer returns values of 600 and AUTO.

@PJL COMMENT Inquiring Default Settings

~<CR><LF>

@PJL ECHO 08:10:33.7 04-17-93 <CR><LF>

@PJL DINQUIRE RESOLUTION <CR><LF>

@PJL DINQUIRE PERSONALITY <CR><LF>

<ESC>%-12345X

For the HP LaserJet 4 printer, a sample response for this example is

as follows. Responses from other PJL printers may vary.