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

EN Status Readback Commands 7-39
A sample HP LaserJet 4 printer response for unsolicited page status
is shown here. Other PJL printer responses may vary.
@PJL USTATUS PAGE<CR><LF>
1<CR><LF>
<FF>
@PJL USTATUS PAGE<CR><LF>
2<CR><LF>
<FF>
@PJL USTATUS PAGE<CR><LF>
3<CR><LF>
<FF>
@PJL USTATUS PAGE<CR><LF>
4<CR><LF>
<FF>