HP Color LaserJet 5500 Technical Reference Manual page 150

Example: Using
Timed Unsolicited
Related Commands:
7-42 Status Readback Commands
In this example, a status message is sent to the host every
30 seconds.
Status
<ESC>%-12345X@PJL <CR><LF>
@PJL USTATUS TIMED = 30 <CR><LF>
<ESC>%-12345X
A sample HP LaserJet 4 printer response is shown below.
Other PJL printers may respond differently.
@PJL USTATUS TIMED<CR><LF>
CODE=10001<CR><LF>
DISPLAY="00 READY"<CR><LF>
ONLINE=TRUE<CR><LF>
<FF>
INFO, ECHO, INQUIRE, DINQUIRE, SET, USTATUSOFF