NCI 122X, User Manual, Page: 23 / 40

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