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I
11.3 PIN FUNCTIONSON INTERFACES
ParallelInterface
Function
Goesfrom High to Low (for at
least 0.5 microseconds)when
dataare valid.
2
DATA1
IN
3
DATA2
IN
$
DATA3
IN
Eight-bit character data.
5
DATA4
IN
DATA8 is the most significant
6
DATA5
IN
bit; DATA1 is the least
7
DATA6
IN
significant bit, High is logic 1
and Low is logic O.
B
DATA7
IN
9
DATA8
IN
10
ACK
OUT
A
lowpulseacknowledges
receiptof data.
11
BUSY
OUT
Low whentheprinteris ready
to acceptdata.
12
PAPER
OUT
Goes
Highif theprinterruns
OUT
out of paper.
13
SELECTED
OUT
Highwhentheprinteris on line
14-15
N/C
Unused
16
SIGNAL
Signal g round.
, GND
17
CHASSIS
Printer'schassisground,
GND
isolatedfromsignalground.
18
+5VDC
OUT
External
s upply
of
+5VDC
19-30
GND
Twisted pair return signal
ground level.
31
—
R ESET
IN
Low input resets the printer to
its
power-oncondition.
32
—
E RROR
OUT
Goeslow to siaal thatthe
printer cannot@nt due to an
errorcondition.
33-36
N/C
Unused
109
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