Appendix J

 

 

 

 

 

 

 

 

 

 

 

Table

7

(Cont’d)

 

 

 

 

 

 

 

 

 

 

 

Signal

 

Return

 

Signal

 

Direction

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin No.

 

Pin No.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

30

 

 

 

PE

 

OUT

 

Always

GND

Level .

 

 

 

 

 

 

 

13

 

-

 

 

SLCT

 

OUT

 

P u l l e d

u p

t o + 5 V v i a

3 . 3 κ Ω

r e s i s t o r .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

-

 

 

AUTO

 

 

 

 

I n

 

W i t h t h i s

s i g n a l b e i n g

 

a t " L O W "

l e v e l , t h e

 

 

FEED X

 

 

 

 

 

 

 

 

 

 

p a p e r

i s a u t o m a t i c a l l y

 

f e d

o n e

l i n e a f t e r

 

 

 

 

 

 

 

 

 

 

 

 

 

 

p r i n t i n g .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(The signal

level can

be

fixed

to

"LOW"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

w i t h A U T O p r o v i d e d o n t h e

 

 

 

 

 

 

 

 

 

 

 

 

 

 

control circuit board . )

 

 

 

 

 

 

 

15

 

-

 

 

 

N C

 

 

 

Not used.

 

 

 

 

 

 

 

 

 

16

 

-

 

 

 

OV

 

 

 

Logic

GND

level.

 

 

 

 

 

 

 

17

 

-

C H A S S I S -

 

G N D

 

P r i n t e r c h a s s i s G N D .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In the

printer, the chassis

GND

and the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

l o g i c G N D a r e i s o l a t e d f r o m e a c h o t h e r .

 

18

 

-

 

 

+5V

 

-

 

+ 5 V

 

 

 

 

 

 

 

 

 

 

 

19 to 30

 

-

 

 

 

GND

 

-

 

TWISTED - PAIR RETURN signal

GND level .

31

 

-

 

 

 

 

 

 

In

 

 

 

 

 

 

 

 

 

INIT

 

 

W h e n

t h e

l e v e l o f t h i s

s i g n a l b e c o m e s

 

 

 

 

 

 

 

 

 

 

 

 

 

 

"LOW", the printer controller is reset to its

 

 

 

 

 

 

 

 

 

 

 

 

 

initial

state and the print buffer is cleared .

 

 

 

 

 

 

 

 

 

 

 

 

 

This signal

is normally

at

"HIGH"

level .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a n d i t s p u l s e w i d t h m u s t b e m o r e t h a n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50µs at

the

receiving

 

terminal .

 

 

 

3 2

 

 

 

ERROR

 

Out

 

A l w a y s

" H I G H " l e v e l

P u l l e d

u p

t o + 5 V

v i a

 

 

 

 

 

 

 

 

 

 

 

 

 

3 . 3 κ Ω r e s i s t o r .

 

 

 

 

 

 

 

3 3

 

-

 

 

 

GND

 

-

 

S a m e

a s

w i t h P i n N o s .

1 9 t o

3 0 .

 

 

3 4

 

-

 

RESET

 

Out

 

R e s e t

s i g n a l g e n e r a t e d

w h e n

t h e

P r i n t e r

i s

 

 

 

 

 

 

 

 

 

 

 

 

 

p o w e r e d , o r

w h e n t h e I N I T s i g n a l i s

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a p p l i e d t o t h e P r i n t e r .

 

 

 

 

 

 

3 5

 

 

 

 

 

 

 

 

 

 

 

 

P u l l e d u p t o + 5 V v i a 3 . 3 κ Ω r e s i s t o r .

 

3 6

 

-

 

 

 

NC

 

-

 

Not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTES: 1. “Direction” refers

to the

direction of signal flow as viewed from the

 

 

printer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.“Return” denotes “TWISTED PAIR RETURN” and is to be connected at signal ground level

As to the wiring for the Interface. be sure to use a twisted-parr cable for each signal and never fall to complete connection on the Return side. To prevent noise effectively. these cables should be shielded and con- nected to the chassis of the host computer and the printer. respec- tively.

3 All interface conditions are based on TTL level. Both the rise and fall times of each signal must be less than 0.2µs.

4.Data transfer must not be carried out by ignoring the ACKNLG or BUSY signal. (Data transfer to this printer can be carried out only after con- firming the ACKNLG signal or when the level of the BUSY srgnal IS “LOW”.)

102