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

EN Vertical Picture Frame Size (Decipoints) 18-9
Example:
To specify a horizontal picture frame size of 5 inches, send:
E
C
*c3600X
(5 in. x 720 decipoints/in. = 3600 decipoints).
Vertical Picture Frame Size (Decipoints)
This PCL command specifies the vertical dimension of the window
used for printing an HP-GL/2 plot.
E
C
* c # Y
# =Vertical size in decipoints (1/720th inch)
Default = The distance between the default top and bottom
margins (the default text length)
Range = 0 - 32767 (valid to 4 decimal places)
Note The vertical dimension specified is parallel to the PCL Y-axis when
the print direction is set to 0 degrees (the default).
Example:To specify a vertical picture frame
size of 6.5 inches, send:
E
C
*c4680Y
(6.5 in. x 720 decipoints/in. = 4680 decipoints)