The Appendices contain a summary
of
the
escape sequences.,
ASCII tables,
and
instructions
for
changing baud rate and
switching the serial interface
from
RS-232C
to
RS-422. The
Centronics Parallel Interface
is
also discussed, along with interface
configuration information and cable pin assignments. A glossary
of
terms is contained in the back
of
the manual
to
assist you if
you run into any terminology problems, and
an
index
is
supplied
to
allow quick reference
to
any subject in the manual.
How to Use Escape Sequences
An escape sequence
is
a string
of
characters, beginning with the
"escape character", which selects one
of
the printer's features, such
as raster graphics, number
of
copies, landscape orientation, etc.
The
escape character
(EC)
is
also called a
control
code
or
control
character-
it "controls" the action
of
the
printer, so
to
speak.
The escape character
is
not a printable
character
(like numbers
and letters). Its function
is
to
let
the
printer
know
an
escape
sequence
is
on
the way. When
an
escape sequence is sent
to
the
printer,
the
printer knows
that
the next several characters will not
be printed as text, but will be used
to
access
one
of
the
printer's
features.
An escape sequence consists
of
the escape
control
code
(EC)
followed by
one
or
more characters in succession. Both
two-character
and
parameterized escape sequences
control
the
LaserJet family printers. Two-character escape sequences take
the
form
EcX, where X
is
a character
from
the
ASCII table
("0"
through
"_"
--
see ASCII tables in Appendix
B).
If
a character
within the
range"
!
II
through
"I
II
is
received,
the
escape sequence
is
parameterized. Parameterized escape sequences
are
structured
in the following form:
EC
X Y # Z [binary data]
PARAMETERIZED CHARACfER--Any character from
the ASCII table within
the
range"
! " through
"I
".
The
purpose
of
such a character
is
to
indicate
that
the
escape
sequence
is
parameterized.
X
1-6
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