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Model 1221
Parallel Version
Pin No. Signal
1
Data Strobe
2
Data Bit 1
3
Data Bit 2
4
Data Bit 3
5
Data Bit 4
6
Data Bit 5
7
Data Bit 6
8
Data Bit 7
9
Data Bit 8
10
Acknowledge From printer
11
BUSY
16-29
0 Volts
12
0 Volts
13
+5v
32
+5v
The
rest
are not
used.
Direction
To printer
To printer
From printer
-
From printer
From printer
From printer
Model 122X MiniPrinter User's Manual
Description
Samples input data when held low
for 10 microseconds.
Indicates input data.
High level indicates "1" and
low level "0".
Indicates character input completion
at low level.
Indicates data cannot be received at
high level.
Twisted pair return (For pins 1 to 11)
High = Out of paper.
High = printer selected.
Low level = Error condition.
23
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