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Appendix I
The Parallel Interface
The LX-80 printer uses a parallel interface to communicate with
the computer; this appendix describes it.
Connector pin assignments and a description of respective interface
signals are shown in Table I-1.
Table I-1. Pins and signals
Sji,l
Return
Signal
Direc-
Pin
tion
Description
1
19
STROBE
IN
STROBE
pulse
to
read
data
in.
Pulse
width
must
be
more
than
0.5
micro-
seconds
at
the receiving terminal.
z
E
DATA1
IN
DATA2
These signal represent information
of
IN
the
1
st
to
8th
bits
of
parallel
data,
4
;:
DATA3
IN
DATA4
respectively.
Each
signal
is
at
HIGH
z
IN
level
when
data
is
logical
1
and
LOW
87
z
DATA5
IN
DATA6
when
it
is
logical
0.
DATA7
I!
9
2
DATA8
IN
10
28
ACKNLG OUT
Approximately
12-microsecond
pulse
LOW
indicates that
data
has
been
received
and
that
the
printer
is
ready
to
accept
more
data.
11
29
BUSY OUT
A
HIGH
signal indicates that
the
print-
er
cannot
receive
data.
The
signal
goes
HIGH
in
the
following cases:
1)
During
data
entry.
2)
During
printing.
3)
When
off-line.
12
30
PE
4)
During
printer-error
state.
OUT
A
HIGH
signal indicates that the
print-
er
is
out
of
paper.
I-1