Spectravideo MKI, Сервисное – Техническое руководство, Страница: 99 / 134

RS- 2 3 2 I n t e r face
S i g n a l
Charac t e r i s t i c s - EIA RS- 2 3 2 C
1 . Rec e i ve
a . Mark
b . Space
2 . T ra n sm i t
a .
· M ark
b . Space
- 3 to
- 2 5
vo l t s
+ 3
t o
+ 2 5
vo l t s
-8 vo l t s w i th
3 K
ohm l oa d
+ 8
vo l t s w i t h 3K Ohm l o a d
M a x i mum s h o r t c i r cu i t cu r r e n t
T e rm in a t i n g Impe n d a n c e
500 rnA
3K
t o
7K
ohm
S ig n a l C h a r a c t e r i s t i c s - O p t i on a l
20
rnA Cu r r e n t Loop
Whe n u s i n g t h e Te l e t yp e Mode l 3 3 o r s i m i l a r data t e rm i na l emp l o y ing
a
cu r
re n
t i n t e r f a c e , t he
da ta
t e rm i n a l
MUST
be s e t
up to ope r a te i n the
F u l l -Dup l e x
20
M i l l i ampe r e N e u t r a l con f i g u ra t i o n . Re f e r
to the re l a t e d
e qu ipment
man u a l f o r i n s t r u c t ions .
TERMINAL In t e r face P i n A s s ignme n t s
-
E I A
RS-23 2 C
P i n
1
2
3
5
6
7
8
20
1 6
2 5
Func t i on
P ro t e c t i ve Ground
T ransm i t t e d Da ta ( Data In )
Re c e i ve d Data
( D a ta Ou t .)
C l e a r to Send
Da ta Set
Rea dy
S igna l Ground
Da ta Carr ier De t e c t o r
D a t a Term ina l Rea dy
Rdy / Busy Outpu t ( R dy=OV , Busy=+SV )
Sta
r
t / Stop Inpu t ( S tar t=OV , S t op=+5V )
( 1 6 and
25
a re o p t i ona l features )
4 . 66