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Inferface
The parallel interface connector pin assignments and a description of the
interface signals are shown in the table below.
Signal
Return
Pin
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
1 4
15
16
17
18
A-6 Technical Specifications
Signal
19
STROBE
20
DATA 1
DATA 2
21
22
DATA 3
DATA 4
23
DATA 5
24
25
DATA 6
26
DATA 7
27
DATA 8
28
ACKNLG
29
BUSY
PE
30
SLCT
—
A U T O
—
F E E D
NC
—
G N D
—
CHASSIS
GND
—
N C
Direction
Description
IN
STROBE pulse to read data.
Pulse width must be at least
0.5 µs at the receiving
terminal.
IN
These signals represent
IN
parallel data bits 1 to 8,
IN
respectively. Each signal is at
IN
HIGH level when data is
IN
logical 1 and LOW when it is
IN
logical 0.
IN
IN
About a 1-10-µs pulse width.
OUT
LOW indicates data has
been received and the
printer is ready to accept
more data.
OUT
A HIGH signal indicates that
the printer cannot receive
data. The signal goes HIGH in
the following cases.
1. During printing
2. During a printer-error state
A HIGH signal indicates the
OUT
printer is out of paper
Pulled up to +5v through
OUT
3.3
IN
Not used
Not used
—
Logic ground level
—
Printer's chassis ground,
—
w h i c h i s c o n n e c t e d t o t h e
s i g n a l g r o u n d .
Not used
—
resistance.
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