Olivetti JP 90 Manual Del Usuario página 273

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Command Codes
Introduction
When the printer is set for a particular emulation, it will
interpret ONLY the set of commands belonging to that
emulation.
A printer command consists typically of one or more
characters imbedded in the flow of data transmitted to the
printer. To make the printer understand which characters are
to be interpreted as commands and which as printable
characters, there is a simple built-in convention: all
"characters" that have, according to the character table, a
decimal value less than 32 are interpreted as control codes.
Some of them result in an action, when they are received,
others do not. The ones causing printer action can be found
in the command code description. There is also a special
command ESCAPE (decimal code 27, named ESC) which is
used by most printer emulations to open a command
sequence. It is followed by one or more additional
characters, which are identifiers and parameters, belonging
to the printable characters or to those from the range of
control codes.
If your printer receives commands which are not compatible
with the emulation in use, it will ignore them, print them as
normal characters or even block. Whatever happens, no
serious harm will be done to your printer. To clear the
situation, just switch the printer off and on again.
Command Codes - Introduction
PCL III + multiple ESCape sequences
If the consecutive ESCape sequences you send to the printer
have the same two characters after the character ESC, you
can save time by sending a single multiple ESC sequence to
the printer. This multiple sequence will consist of the ESC
character, the two common character which follow ESC and
the remaining characters of each individual command.
E.g.: if you have to send the sequences: ESC ( s 3 B, ESC (
s 3 T and ESC ( s 1 Q, you can do so using the multiple
sequence ESC ( s 3 b 3 t 1 Q. Note that the last character of
the first two sequences "B" and "T" have become lower case
("b" and "t" respectively), while the last character of the last
sequence ("Q") has remained upper-case (indicating, thus,
the end of the multiple sequence).
PCL III + attribute selection priority
Font
The font selection MUST ALWAYS be indicated in the
following order:
1. Print orientation (PORTRAIT or LANDSCAPE)
2. Character set (CP 437, etc.)
3. Character position on the print line (normal,
superscript,
subscript)
4. Spacing (fixed or proportional)
5. Print pitch
6. Character height (dots)
7. Style (upright or italic)
8. Stroke weight (medium or bold)
9. Typeface (Courier, etc.)
10. Print quality (DRAFT, NLQ, LQ).
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