Epson LQ 1050 User Manual - Page 162

Interface Specifications, Parallel interface

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Interface Specifications The LQ is equipped with both a parallel and a serial interface. Do not plug more than one interface cable into the printer 8 at one time. This may damage your printer. Parallel interface Connector pin assignments and a description of their respective interface signals are shown in the following table. Signal Pin 1 Return Pin 19 Signal STROBE 20 DATA 1 : DATA 2 4 22: DATA 3 DATA 4 : 2 DATA 5 25 DATA 6 ii DATA 7 9 2 DATA 8 10 28 ACKNLG 11 29 BUSY Direction Description IN STROBE pulse to read data. Pulse width must be more than 0.5 microseconds at the receiving terminal. IN These signals represent information IN of the 1st of 8th bits of parallel IN data, respectively. Each signal is a t IN HIGH level when data is logical 1 IN and LOW when it is logical 0. IFi IN OUT About an 1 1 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 (ea. char. 4) During printer-error state

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Interface Specifications
The LQ is equipped with both a parallel and a serial interface.
8
Do not plug more than one interface cable into the printer
at one time. This may damage your printer.
Parallel interface
Connector pin assignments and a description of their respective
interface signals are shown in the following table.
Signal
Return
Pin
Pin
Signal
Direction
Description
1
19
STROBE
IN
STROBE
pulse
to
read
data.
Pulse
width
must
be
more
than
0.5
microseconds
at
the
receiving
terminal.
:
20
DATA
1
IN
These
signals
represent
information
22:
DATA
2
IN
of
the
1st
of
8th
bits
of
parallel
4
DATA
3
IN
data,
respectively.
Each
signal
is
at
:
2
DATA
4
IN
HIGH
level
when
data
is
logical
1
DATA
5
IN
and
LOW
when
it
is
logical
0.
ii
25
DATA
6
2
DATA
7
IFi
9
DATA
8
IN
10
28
ACKNLG
OUT
About
an
1
1
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
printer
cannot
receive
data.
The
signal
goes
HIGH
in
the
following
cases:
1)
During
data
entry
(ea.
char.
4)
During
printer-error
state