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Appendix J
Signal
Pin No.
12
13
14
15
16
17
18
19 to 30
31
3 2
3 3
3 4
3 5
3 6
NOTES: 1. "Direction" refers to the direction of signal flow as viewed from the
102
Table 7 (Cont'd)
Return
Signal
Direction
Pin No.
30
PE
OUT
SLCT
OUT
-
AUTO
-
FEED X
-
N C
-
OV
C H A S S I S - G N D
-
-
+5V
-
GND
-
INIT
ERROR
-
GND
RESET
-
-
NC
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
"LOW".)
Description
A l w a y s G N D L e v e l .
P u l l e d u p t o + 5 V v i a
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
p a p e r
i s
a u t o m a t i c a l l y
p r i n t i n g .
( T h e s i g n a l l e v e l c a n b e f i x e d t o " L O W "
w i t h
A U T O
p r o v i d e d
c o n t r o l
c i r c u i t
b o a r d . )
Not used.
L o g i c G N D l e v e l .
P r i n t e r c h a s s i s G N D .
I n t h e p r i n t e r , t h e c h a s s i s G N D a n d t h e
l o g i c
G N D
a r e
i s o l a t e d
-
+ 5 V
-
T W I S T E D - P A I R R E T U R N s i g n a l G N D l e v e l .
In
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
" L O W " , t h e p r i n t e r c o n t r o l l e r i s r e s e t t o i t s
i n i t i a l s t a t e a n d t h e p r i n t b u f f e r i s c l e a r e d .
T h i s s i g n a l i s n o r m a l l y a t " H I G H " l e v e l .
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
5 0 µ s a t t h e r e c e i v i n g t e r m i n a l .
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
r e s i s t o r .
-
S a m e a s w i t h P i n N o s . 1 9 t o 3 0 .
Out
R e s e t
s i g n a l
g e n e r a t e d
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 .
P u l l e d u p t o + 5 V v i a
-
N o t u s e d .
r e s i s t o r .
f e d
o n e
l i n e
a f t e r
o n
t h e
f r o m
e a c h
o t h e r .
w h e n
t h e
P r i n t e r
i s
r e s i s t o r .
S
I
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