Epson LX-80 User Manual - Page 141

Appendix I-the Parallel Interface

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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 Pin 1 19 STROBE DATA1 z E DATA2 4 DATA3 ;: DATA4 z DATA5 z DATA6 87 DATA7 9 2 DATA8 10 28 ACKNLG 11 29 BUSY 12 30 PE Direction Description IN STROBE pulse to read data in. Pulse width must be more than 0.5 microseconds at the receiving terminal. IN These signal represent information of IN the 1 st to 8th bits of parallel data, IN respectively. Each signal is at HIGH IN level when data is logical 1 and LOW IN when it is logical 0. I! IN OUT Approximately 12-microsecond pulse LOW indicates that data has been received and that the printer is ready to accept more data. OUT A HIGH signal indicates that the printer cannot receive data. The signal goes HIGH in the following cases: 1) During data entry. 2) During printing. 3) When off-line. 4) During printer-error state. OUT A HIGH signal indicates that the printer is out of paper. I-1

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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