HP Color LaserJet 5500 Technical Reference Manual page 21

The following illustration is an example of a PJL command
line containing the ENTER command:
The table below lists the control codes and special
identifiers used in this manual:
<HT> Horizontal tab character (ASCII 9).
<LF> Line feed character (ASCII 10).
<CR> Carriage return character (ASCII 13).
<SP> Space character (ASCII 32).
<ESC> Escape character (ASCII 27).
<FF> Form feed character (ASCII 12).
<WS> White space, a result of one or more <SP> or
<HT>.
<words> Printable characters (Roman-8 characters 33
through 255) and <WS>, starting with a
printable character.
^D PostScript end-of-file indication. It is not
part of PJL, but is used to end PostScript
examples.
PJL Command Syntax and Format 2-3