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B–2
Host I/O Interfaces
Table B–1. Centronics Parallel Interface Connector Pin Assignments
Input Signals Output Signals
Signal Pin Signal Pin
DATA LINE 1 2
Return 20
ACKNOWLEDGE 10
Return 28
DATA LINE 2 3
Return 21
SELECT 13
Return 28
DATA LINE 3 4
Return 22
PAPER EMPTY 12
Return 30
DATA LINE 4 5
Return 23
BUSY 11
Return 29
DATA LINE 5 6
Return 24
NFAULT 32
Return 33
DATA LINE 6 7
Return 25
PRIME 31
Return 30
DATA LINE 7 8
Return 26
DATA LINE 8 9
Return 27
PAPER INST 15
Return 29
Chassis GND 17
+ 5 Volts 18
DATA STROBE 1
Return 19
Centronics Parallel Interface Signals
The Centronics interface signals are defined below.
P
APER EMPTY
– A high true level from the printer to indicate the printer is in a
fault condition.
SELECT – A high true level from the printer to indicate the printer is ready for
data transfer and the ON LINE switch has been activated.
BUSY
– A high true level from the printer to indicate the printer cannot receive
data.