Product Description
LQ-300
Service Manual
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
(!!%”%
‘0’
Description
STROBE
The STROBE pulse is used to read the input
1
19
In
data. The pulse width must be more than 0.5
ps.
Input data is latched after the falling edge of this
signal.
DATAO-DATA7
Parallel input data to the printer.
2-9
20-27
In
A HIGH level means data 1.
A LOW level means data O.
ACKNLG
This pulse indicates data has been received and
10
28
out the printer is ready to accept more data. The
pulse width is approximately 12
U.S.
11
BUSY
29
out
HIGH indicates the printer cannot acoept more
data.
12
‘
E
28
out
HIGH indicates paper-out. This signal is effective
only when the ERROR
signal
is LOW.
13
SLCT
28
out
Always HIGH output. (Pulled up to +5
V
through
3.3K Q resistor.)
14
AFXT
30
In
Not used.
15,34
NC
.
—
Not connected.
16
GND
—
—
Signal ground.
17
Chassis
GND
—
—
Chassis ground.
18
LOGIC-H
—
out Pulled up to +5
V
through 3.9K
Q
resistor.
19-30
GND
. —
Signal ground.
31
INIT
30
In
Input for printer initialization. Pulse width 50
w
minimum, active LOW.
32
ERROR
29
out
LOW indicates that some error has
o=urred
in
the printer.
33
GND
—
—
Signal ground.
35
+5V
—
out Pulled up to +5 V through
3.3K
Q
resistor.
36
SLIN 30
In
Not used.
*
7%e
//0 column indicates the direction of the signal as viewed from the printer.
c
.%
{,,’”.
-c.-
‘{‘
.
.
.
1-12
Rev. A
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