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9.3 PIN FUNCTIONS ON INTERFACES
● Paralle interface
PinNo.
Signal
Name
Direction
Function
1
STROBE
IN
Goes from High to Low (for at
least 0.5 microseconds) when
data are valid.
2
DATA1
IN
3
DATA2
IN
4
DATA3
IN
Eight-bit character data.
5
DATA4
IN
DATA8 is the most significant
6
DATA5
IN
bit; DATAI is the least
7
DATA6
IN
significant bit. High is logic 1
8
and Low is logic O.
DATA7
IN
9
DATA8
IN
10
ACK
OUT
A low pulse acknowledges
receipt of data.
11
BUSY
OUT
Low when the printer is ready
to accept data.
12
PAPER
OUT
Goes High if the printer runs
OUT
out of paper.
13 SELECTED
OUT
High when the printer is on line
14-15 N/C
Unused
16 SIGNAL
Signal ground.
GND
17 CHASSIS
Printer’s chassis ground,
GND
isolated from signal ground.
18
+5VDC
OUT External supply of +5VDC
19-30 GND Twisted pair return signal
ground level.
31
RESET
IN
Low input resets the printer to
its power-on condition.
32
ERROR
OUT
Goes low to signal that the
printer cannot print due to an
error condition.
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NT /fl
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