Xerox 4213 User Manual
Page 26
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