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

EN Font Header Format 11-21
Symbol set escape sequence termination characters can be any
upper case ASCII character “A” through “Z.” “Q” is reserved for use
with HP “Specials” symbol sets and is not recommended for general
use.
Notes Symbol set ID’s of “@” and “X” do not have a corresponding Symbol
Set selection command, sets marked as such can be selected only
with the Font ID.
This field must have a value of 56 for a type 10 or 11 font (unbound
Intellifont scalable) to be valid.
Pitch (UI)
Bitmap Font - Specifies the pitch of the font in quarter dots
(four quarter-dot units, also known as radix dots, equal one dot).
It combines with Pitch Extended to specify the pitch of the font in
1024
th
-dots. Pitch defines the default HMI for the font.
For example, a a 17 cpi font designed at 300 dpi has a pitch value of
70 radix dots as calculated:
The remainder 0.588 is converted back to dots and then to
1024
th
-dots as shown below:
Pitch Extended is set to 150 1024
ths
-units.
Note For a proportional font, the width “printed” for a control code Space is
determined by the pitch value, unless an HMI command is received
following the selection of the font.
Scalable Fonts - Contains the master design space width
(escapement) of the font in design units.