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Thefollowingdescribesthepinoutoftheparallel(Centronics-type) i nter-
face connector(signalswhich are low when activeate overlined):
Pin
Name
Function
1
STROBE
Goes from high to low (for 20.5ps) when active
I
2
I DATAO
I High when active
I
3"
DATA1
High when active
4
DATA2
High when active
5
DATA3
High when active
6
DATA4
High when active
7
DATA5
High when active
8
DATA6
High when active
9
DATA7
High when active
"
10
ACK
5ys low pulse acknowledges receipt of data
11
BUSY
Low when printer ready to receive data
12
PAPER
High when paper
OUL
Can be disabled with DIP switch
setting
13
SELECT
High when printeris on-line
I 14,15
I N/'C
I
I
16
SIGNAL GND
Signal ground
17
CHASSIS
Chassis ground (isolated from signal ground)
18
+5V
+5V DC output from ~inter
19-30
GND
Twisted pair ground rehrrn
31
RESET
When this input signal is low, printer is reset
32
ERROR
Outputs low when printer cannot continue, due to an error
33
j EXT GND
External ground
34,35
NI'C
36
SELECT IN
Always high
102
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