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

EN Spacing Command 8-9
Spacing Command
Inter-character spacing can be specified as either proportional or
fixed.
E
C
( s # P - Primary spacing
E
C
) s # P - Secondary spacing
# = 0 - Fixed spacing
1 - Proportional spacing
Default = 0
Range = 0, 1 (values outside the range are ignored)
When proportional spacing is specified and a proportionally-spaced
font is not available (in the requested symbol set), a fixed pitch font
with the current pitch specification is selected. If fixed spacing is
specified but is not available, a proportional-spaced font is selected
and the pitch characteristic is ignored.
For fixed-spaced bitmap fonts, both pitch and height (point size) are
used for selection of font character size. However, for fixed-spaced
scalable fonts, only pitch is used. For proportional bitmap and
scalable fonts, only height is used for selection of font character size.
The user default primary and secondary spacings are implicitly set by
selection of a user default font from the printer’s control panel (refer to
the printer User’s Manual).
Example
To specify proportional spacing for the primary font, send:
E
C
(s1P
To specify fixed spacing for the secondary font, send:
E
C
)s0P