Chapter 14 Centronics Parallel Interface

Centronics Parallel Interface

The Centronics interface enables the printer to operate with controllers designed for buffered Centronics printers. The length of the data cable from the host computer to the printer must not exceed 15 feet (5 meters).

Table 15. Centronics Interface Connector Pin Assignments

Input Signals

 

Output Signals

 

Miscellaneous

 

Signal

Pin

Signal

Pin

Signal

Pin

 

 

 

 

 

 

 

 

 

 

 

 

DATA LINE 1

2

ACKNOWLEDGE

10

CHASSIS GROUND

17

Return

20

Return

28

 

 

DATA LINE 2

3

ONLINE

13

GROUND

30

Return

21

Return

28

 

 

DATA LINE 3

4

FAULT

32

Spares

14

Return

22

Return

29

 

 

DATA LINE 4

5

PAPER EMPTY

12

No Connection

34, 35,

Return

23

Return

28

 

36

DATA LINE 5

6

BUSY

11

+5 Volts

18

Return

24

Return

29

 

 

DATA LINE 6

7

 

 

 

 

Return

25

 

 

 

 

DATA LINE 7

8

 

 

 

 

Return

26

 

 

 

 

DATA LINE 8

9

 

 

 

 

Return

27

 

 

 

 

DATA STROBE

1

 

 

 

 

Return

19

 

 

 

 

PAPER INSTRUCTION

15

 

 

 

 

Return

29

 

 

 

 

PRIME

31

 

 

 

 

Return

30

 

 

 

 

 

 

 

 

 

 

Centronics Interface Signals

The Centronics interface signals between the host computer and the printer are defined as follows:

Data Lines 1 through 8. Provide eight standard or inverted levels from the host that specify a character or function code. Data Line 8 allows access to the extended ASCII character set. You may enable or disable this line via the Data Bit 8 parameter on the Centronics submenu.

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HP LQH-HW 3ULQWHUV manual Centronics Parallel Interface, Centronics Interface Signals

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