Xerox 300x User Manual

The printer has a standard unidirectional, byte-wide parallel, synchronous 
port.  When you use the parallel port, be sure to type this command at the 
PC (if LPT1 is not available, use LPT2):

The table shows the parallel port’s connected pins.  Other pins are not 
connected.  Signal names ending with a dash (

–

) are asserted low.

DSTRB–

1

19

Host

Pulsed low for .5 microseconds 

minimum; clocks data into printer

DATA1

2

20

Host

Positive true data input

DATA2

3

21

Host

Positive true data input

DATA3

4

22

Host

Positive true data input

DATA4

5

23

Host

Positive true data input

DATA5

6

24

Host

Positive true data input

DATA6

7

25

Host

Positive true data input

DATA7

8

26

Host

Positive true data input

DATA8

9

27

Host

Positive true data input

ACK–

10

28

Printer

Data acknowledge pulsed low for 

3-4 microseconds; ends bus 
transaction

BUSY

11

29

Printer

Positive true = cannot accept data

PE

12

—

Printer

Positive true = out of paper

SLCT

13

—

Printer

Positive true = printer selected

INPRIME–

31

30

Host

Negative true = printer port reset

FAULT-

32

—

Printer

Negative true = printer fault 

indicator

Frame Gnd

—

17

Printer

Frame ground

SGnd

—

14,16,33

Printer

Signal ground