Interface Overview; Parallel Interface - Epson LX-1050+ Service Manual

General Description

1.3 INTERFACE OVERVIEW

The LX-105O+ is equipped with the following external interfaces;
Centronics parallel interface
Optional Type A interface
1.3.1

Parallel InterFace

Data Format
Synchronization
Handshaking
Signal Level
Adaptable Connector
Table 1-6 shows the comector pin assignments and signal functions of the parallel interface.
B U S Y
DATA
STROBE
Table 1-6. Connector
Pin No. Signal Name
1 STROBE
2-9 DATA 1-8
10
11 BUSY
8-bit parallel
By STROBE pulse
By BUSY and ACKNLG signal
Ill-compatible
57-30360 (arnphanol) or equivalent
Pin Assignments and Signal Functions
The STROBE pulse is used to read data from the host
computer. The pulse width must be 0.5p.s
I
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
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.
approximately 10P.s. This signal goes LOW upon the
o
completion of data reception, to indicates that the printer
is ready to receive further data.
The BUSY signal informs the host computer of the
o
printer's status. When this signal is HIGH, the printer
cannot accept further data.
Description
or more.
Rev. A