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Carriage Return
(CR)
Code
The carriage return
(CR)
code serves
as a
print command to the printer.
Data
is
received by the printer and stored
in the
print buffer until
a
CR code
is
received.
Upon receipt of
a
CR
code, the
contents of
the
print buffer
are
printed.
If the
print buffer
is
filled, a
CR
code
is
generated by
the printer
and the line
is
printed.
The print head
is
returned
to the left
margin after
the content of the print buffer
is
printed.
ESC, SO; ESC, SI
Code Sequence and Data Bit
8
Control
The ESC, SO code sequence
(or
bit
8
logically
high) initiates
printing
of elongated characters (doublewidth characters.)
The ESC, SO code sequence
may
be sent to the
printer
at
any time during the transmission of
a
line of
character data
(up
to 40 characters.)
Reception of
an
ESC
SI
code sequence
(or
bit
8
logically
low)
causes all data following the code sequence to be
printed normal
size.
The end of
a
print line terminates printing of elongated
characters.
The next line of data will be printed as standard-width characters
unless an
ESC,
SO code sequence
is
received during
the
transmission
of the
character data
for
that line.
ESC, PCI; ESC, DC3
Code Sequence
The primary character density
is 10
cpi, selected by the printer
logic during initialization,
or by ESC, DC3.
The ESC, DC4 code sequence
selects
the 16.7 cpi
character density.
The print buffer
is
set to
80
char-
acters
for
10
cpi and
132
characters
for 16.7 cpi.
The 16.7 cpi character
density
is
deselected by sending an
ESC, DC3
code sequence
or at the end of a
print
line.
2.2.6
ASCII CODE CHARTS
Figures
2-4
through
2-6 are the
ASCII code charts showing the
96
ASCII characters
for the six
different character
sets, the
codes
for the
various characters,
and the
control codes recognized by the printer.
2-5
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