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B–2
Host I/O Interfaces
Centronics Parallel Interface
This interface enables the printer to operate with controllers designed for
buffered Centronics printers. The interface is capable of transferring up to
200,000 characters per second. The maximum cable length from the controller
(host computer) to the printer is 15 feet.
Centronics Interface Connector Pin Assignments
The printer provides a 36–pin D–shell connector on the rear panel for connection
of a Centronics parallel interface cable. Table B–1 lists the pin assignments of the
Centronics interface connector.
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 32, 13
DATA LINE 3 4
Return 22
PAPER EMPTY 12
DATA LINE 4 5
Return 23
BUSY 11
Return 29
DATA LINE 5 6
Return 24
DATA LINE 6 7
Return 25
DATA LINE 7 8
Return 26
DATA LINE 8 9
Return 27
PAPER INST 15
Return 14
Chassis GND
17
DATA STROBE 1
Return 19
Spares 18, 30, 31
34, 35, 36