HARDWARE DESCRIPTION

For signal description and pin assignment, refer to the

table below:

Table 5. Signal description and pin assignment

Signal

Return

Signal

Direction

Description

Pin

Pin

 

 

 

 

 

 

 

 

1

19

STROBE

IN

The STROBE pulses to read

 

 

 

 

data. Pulse width must be more

 

 

 

 

than 0.5 µseconds at the

 

 

 

 

receiving terminal.

 

 

 

 

 

2

20

DATA 1

IN

These signals represent data in

3

21

DATA 2

IN

bits 1 to 8 of parallel data,

4

22

DATA 3

IN

respectively. Each signal is high

5

23

DATA 4

IN

when data is logical 1 and low

6

24

DATA 5

IN

when it is logical 0.

7

25

DATA 6

IN

 

8

26

DATA 7

IN

 

9

27

DATA 8

IN

 

 

 

 

 

 

10

28

ACKNLG

OUT

About a 12-µseconds pulse.

 

 

 

 

Low indicates that data has

 

 

 

 

been received and that the

 

 

 

 

interface card is ready to accept

 

 

 

 

more data. This signal is output

 

 

 

 

paired together with a BUSY

 

 

 

 

signal.

 

 

 

 

 

11

 

BUSY

OUT

A high signal indicates that the

 

 

 

 

interface card cannot receive

 

 

 

 

data. The signal goes high in

 

 

 

 

the following cases:

 

 

 

 

1) During data entry (along

 

 

 

 

with each character)

 

 

 

 

2) When OFF LINE

 

 

 

 

(or PAUSE)

 

 

 

 

3) During printer-error state

 

 

 

 

 

12

 

PE

OUT

A high signal indicates that the

 

 

 

 

printer is out of paper.

 

 

 

 

 

12