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INTERFACES
Centronics signals and pin assignments
Table 1-2 describes Centronics 100 signals and pin assignments.
Table 1-2. Centronics signals and pin assignments
Pin Direction Signal Description
1 To printer STROBE L STROBE pulse low to read data. A strobe
low signal raises BUSY line to high.
2 To printer DATA BIT 1
1
3 To printer DATA BIT 2
1
4 To printer DATA BIT 3
1
5 To printer DATA BIT 4
1
6 To printer DATA BIT 5
1
7 To printer DATA BIT 6
1
8 To printer DATA BIT 7
1
9 To printer DATA BIT 8
1
10 From printer ACKNLG L ACKNLG pulse low indicates data was
received and printer is ready to receive
more data.
11 From printer BUSY H BUSY “high“ indicates the printer cannot
receive data, (buffer is full). BUSY high
occurs when an error condition exists.
12 From printer PE H Ground
13 From printer SLCT H A high signal indicates the printer is in
the select state.
A low signal occurs when the printer is
deselected or if an error condition exists.
14 Ground (standard Centronics)
15 Printer to stunt
box
2 MHz Field stunt box clock. The stunt
box is not provided by Xerox.
16 0 volts Logic ground
1-4 XEROX 4213 LASER PRINTER PROGRAMMER REFERENCE