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

23-74 The Character Group EN
SI, Absolute Character Size
This command specifies the size of labeling characters in
centimeters. Use SI to establish character size independent of P1 and
P2.
SI width, height[;]
or
SI [;]
* Dependent on the current pitch and font height set by the AD or SD commands.
While SI is in effect, with or without specifying parameter values, the
size of characters in the currently selected font are not affected by
changes in P1 and P2.
z No Parameters— Character size is as specified by the SD
(Standard Font Definition) and AD (Alternate Font Definition)
commands.
z Width— Specifies the width of the nominal character in
centimeters. A negative width parameter mirrors labels in the
right-to-left direction.
Note Changing character size also changes the width of line used to draw
Stick font characters.
z Height— Specifies the cap height in centimeters. A negative
height parameter mirrors labels in the top-to-bottom direction.
Note that in most languages the width of a letter is typically less than
the height. If you set your characters to have a different ‘aspect ratio’,
they may look odd to your readers.
An SI command remains in effect until another SI command is
executed, an SR command is executed, or the printer is initialized
or set to default conditions.
Parameter Format Functional Range Default
width clamped real –32768 to 32767 dependent*
height clamped real –32768 to 32767 dependent*