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Agilent Technologies E3632A User Manual page 66

Dc power supply
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Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
D B - 2 5 S e r i a l C o n n e c t i o n
p o r t w i t h a m a l e c o n n e c t o r , u s e t h e n u l l - m o d e m c a b l e a n d 2 5 - p i n a d a p t e r
i n c l u d e d w i t h t h e
A g i l e n t 3 4 3 9 8 A C a b l e K i t .
d i a g r a m a r e s h o w n b e l o w .
5182-4794
Instrument
DCD
1
RX
2
TX
3
DTR
4
GND
5
DSR
6
RTS
7
CTS
8
9
RI
DB9
DB9
Female
Male
D T R / D S R H a n d s h a k e P r o t o c o l
T h e p o w e r s u p p l y i s c o n f i g u r e d a s a D T E (
D a t a T e r m i n a l R e a d y
a n d u s e s t h e D T R (
t h e R S - 2 3 2 i n t e r f a c e t o h a n d s h a k e . T h e p o w e r s u p p l y u s e s t h e D T R l i n e t o s e n d
a h o l d - o f f s i g n a l . T h e D T R l i n e m u s t b e T R U E b e f o r e t h e p o w e r s u p p l y w i l l
a c c e p t d a t a f r o m t h e i n t e r f a c e . W h e n t h e p o w e r s u p p l y s e t s t h e D T R l i n e
F A L S E , t h e d a t a m u s t c e a s e w i t h i n 1 0 c h a r a c t e r s .
T o d i s a b l e t h e D T R / D S R h a n d s h a k e ,
D S R l i n e t o l o g i c T R U E . I f y o u d i s a b l e t h e D T R / D S R h a n d s h a k e , a l s o s e l e c t a
s l o w e r b a u d r a t e t o e n s u r e t h a t t h e d a t a i s t r a n s m i t t e d c o r r e c t l y .
T h e p o w e r s u p p l y s e t s t h e D T R l i n e F A L S E i n t h e f o l l o w i n g c a s e s :
1
W h e n t h e p o w e r s u p p l y ' s i n p u t b u f f e r i s f u l l ( w h e n a p p r o x i m a t e l y 1 0 0
c h a r a c t e r s h a v e b e e n r e c e i v e d ) , i t s e t s t h e D T R l i n e F A L S E ( p i n 4 o n t h e R S -
2 3 2 c o n n e c t o r ) . W h e n e n o u g h c h a r a c t e r s h a v e b e e n r e m o v e d t o m a k e s p a c e
i n t h e i n p u t b u f f e r , t h e p o w e r s u p p l y s e t s t h e D T R l i n e T R U E , u n l e s s t h e
s e c o n d c a s e ( s e e n e x t ) p r e v e n t s t h i s .
64
I f y o u r c o m p u t e r o r t e r m i n a l h a s a 2 5 - p i n s e r i a l
T h e c a b l e a n d a d a p t e r p i n
Cable
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
DB9
DB9
Female
Male
D a t a T e r m i n a l E q u i p m e n t
) a n d D S R (
d o n o t
c o n n e c t t h e D T R l i n e a n d t i e t h e
5181-6641
Adapter
PC
2
TX
3
RX
4
RTS
5
CTS
DSR
6
GND
7
DCD
8
DTR
20
DB25
DB25
Female
Male
) d e v i c e
D a t a S e t R e a d y
) l i n e s o f

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