Table
5-2.
Control
Character
Operations
(concluded)
Decimal
Control
Char
Hex
Code
Code
Description
and
Operation
DC3
13
19
Device Control
3.
Cnfg. code
83
ON: Transmitted on serial interface to indicate
BUSY.
DC4 14
20
Device Control
4.
Tab
to
column
of
decimal number
of
next byte.
EM
19
25
End
of
Message. Next character printed
is
from
G2
character set.
ESC
1B
27 Escape. Cnfg. code
81
OFF: Characters
that
follow
are printed. Code
81
ON: Escape
sequence commands are executed.
GS
10
29 Group Select. Next character printed
is
from
G3
character set.
5.2 SINGLE-PASS OVERSTRIKES
The Model 880 Printer does single-pass over-
strikes to support single-pass underlines in
draft
and enhanced modes. The sequence, character-
backspace-character,
is
recognized
as
a single-
pass overstrike. The single-pass character
dot
pattern
is
formed by merging the
dot
patterns
of
the
two
characters.
5.3 ESCAPE SEQUENCES
The host can control printer operation through
escape sequences.
In the tables
that
follow, some
escape sequences are given in
two
formats in
which
the line number, column number, or form
length
is
represented
as
Nor
n.
The number N
is
entered
as
an ordinary decimal
number. For example,
if
N represents the number
25 in
an
escape sequence, 25
is
entered
as
a 2 and
a
5.
The ASCII characters 2 and 5 are sent
to
the
printer.
The number
n represents the decimal code
for
character n in Table 5-1. For example, if n repre-
sents the number 25 in an escape sequence, the
code
for
character 25 (EM) in the ASCII table
is
entered. The ASCII character
EM
is sent
to
the
printer.
In the following escape sequence tables, the deci-
mal codes
for
the
escape sequence characters are
given
as
examples.
NOTE
Do
not
enter spaces between the
ASCII characters in the escape
sequence commands. The spaces
shown between the characters in these
tables are
for
readability.
5.3.1 Form
Length
Escape
Sequences
The form length
is
expressed
as
the number
of
lines in a form. The form length is set according
to
the currently enabled vertical pitch. Once the form
length has been set, the actual size
of
the
form
remains the same until the form length
is
set dif-
ferently, even
though
the vertical pitch may
change.
See
Table 5-3.
5-3
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