HP PCL/PJL reference (PCL 5 Printer Language) - Technical Reference Manual Part II

23-48 The Character Group EN
Figure 23-27DV Command Character Position for Normal (0)
Parameter
z 0 — +90 degrees.(Reverse Line Feed) Sets the direction of Line
Feeds +90 degrees with respect to the text path.
Figure 23-28DV Command Character Position for Normal (90)
Parameter