General Description
LX-105O+
Service Manual
1.3 INTERFACE OVERVIEW
Centronics parallel interface
Optional Type A interface

Parallel InterFace

The
LX-105O+
is equipped with the following external interfaces;
■
■

1.3.1

Data Format 8-bit parallel
Synchronization
By STROBE pulse
Handshaking
By BUSY and
ACKNLG
signal
Signal Level
Ill-compatible
Adaptable Connector
57-30360
(arnphanol)
or equivalent
Table 1-6 shows the
comector
pin assignments and signal functions of the parallel interface.
BUSY
$1
/
ACKNLG
\
DATA 7p.a.
approx.
5ps.
approx.
STROBE
5ps.
min.
5w.
min.
5ps.
min.
Figure
1-6. Data Transmission
Timing
Table 1-6. Connector Pin Assignments and Signal Functions
Pin No.
Signal Name
1/0
Description
The STROBE pulse is used to read data from the host
1
STROBE
I
computer. The pulse width must be
0.5p.s
or more.
Normally, it is HIGH, and data is latched with rising ~i
edge of this signal.
DATA 1-8 are parallel data bits. When one of these
signals is HIGH, the data bits is 1; when LOW, the data
2-9
DATA 1-8
I
bits is O. The most significant bit ( MSB) is data 8. The
signal state must be maintained for
0.5ps
on either side
of STROBE signal’s active edge.
ACKNLG
is an acknowledge pulse with a width of
10
ACKNLG
o
approximately 10P.s. This signal goes LOW upon the
completion of data reception, to indicates that the printer
is ready to receive further data.
The BUSY signal informs the host computer of the
11
BUSY
o
printer’s status. When this signal is HIGH, the printer
cannot accept further data.
1-8
Rev. A