Epson LQ-300 Service Manual page 20

Product Description
Table 1-13 shows the connector pin assignments and signal functions for the 8-bit parallel interface.
Table 1-13. Signal and Connector Pin Assignments for Parallel Interface
Pin No.
Signal Name
STROBE
1
DATAO-DATA7
2-9
ACKNLG
10
BUSY
11
E
12 '
SLCT
13
14 AFXT
15,34
NC
16
17 Chassis GND
18
LOGIC-H
19-30
INIT
31
ERROR
32
33
35
36
1-12
The STROBE pulse is used to read the input
data. The pulse width must be more than 0.5 ps.
19 In
Input data is latched after the falling edge of this
signal.
Parallel input data to the printer.
20-27 In A HIGH level means data 1.
A LOW level means data O.
This pulse indicates data has been received and
28 o u t the printer is ready to accept more data. The
pulse width is approximately 12 U.S.
HIGH indicates the printer cannot acoept more
29
data.
HIGH indicates paper-out. This signal is effective
28
only when the ERROR signal is LOW.
Always HIGH output. (Pulled up to +5 V through
28
30 In Not used.
.
—
Not connected.
— —
Signal ground.
— Chassis ground.
—
—
o u t Pulled up to +5 V through 3.9K Q resistor.
. —
Signal ground.
Input for printer initialization. Pulse width 50 w
In
minimum, active LOW.
LOW indicates that some error has o=urred in
29
the printer.
—
—
Signal ground.
—
o u t Pulled up to +5 V through 3.3K Q resistor.
30 In Not used.
Description
Rev. A