REV.-A
Table 1-2 shows the connector pin assignments and signal functions of the 8-bit parallel interface.
Table 1-2. Connector Pin Assignments and Signal Functions
No.
Signal Name
Return Pin No.
DIR
Functional Description
1
STROBE
19
In
Strobe pulse to read the input data. Pulse width
must
be more than
Input data is latched after
falling edge of this signal.
2
DATA 1
20
In
Parallel input data to the printer.
3
21
In
“HIGH” level means data “ 1“.
4
22
In
“LOW” level means data “O”.
5
23
In
6
24
In
7
25
In
8
26
In
9
27
In
10
ACKNLG
28
out
This pulse indicates data are received and the
printer is ready to accept next data.
Pulse width is approx. 12
11
BUSY
29
out
HIGH indicates printer can not accept next data.
12
PE
30
o u t
HIGH
indicates paper-out. This signal is effective
only when
ERROR
signal is
“LOW”.
13
SLCT
—
o u t
Always
“HIGH”
output. (Pulled up to
through
3.3 K ohms register.)
14
AUTOFEED-XT
—
In
If the signal is “LOW” when the printer is initialized,
a line feed is automatically performed by input of
“CR” code. (Auto LF)
15
—
—
—
Not used.
16
—
—
Ground for twisted-pair grounding.
17
Chassis
—
—
Chassis ground level of printer
18
—
—
—
Not used.
9 to
30
—
—
Ground for twisted-pair grounding.
31
I NIT
16
In
Pulse (width:
min., active “LOW”) input for
printer initialization.
32
ERROR
—
out
LOW indicates that some error has occurred in the
printer.
33
—
.
Ground for twisted-pair grounding
34
—
—
—
Not used.
35
—
—
out
Always “HIGH”. (Pulled up to
through a
3.3k-ohm register.)
36
SLCT-IN
—
In
If the signal is “LOW” when printer is initialized, the
DC l/DC3 control is disabled.
1-4
