Siemens 100-8D Technical Manual page 43

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B i n a r y S e l e c t (Option)
Th e B i n a r y S e l e c t o p tio n a l l o w s up to e i g h t d i s k d r i v e s to be d a i s y - c h a i n e d to the
c o n t r o l l e r , with a d d r e s s e s 0 t h ro u gh 7.
d e c o d e r 7 C , and eight s e t s of j u m p e r pads ( s e e F i g u r e 3 - 9 ) .
When S E L E C T 0 is i n a c t i v e , the d e c o d e r is inh ibited and a l l ou tputs a r e high.
When S E L E C T 0 is a c t i v e , the d e c o d e r is e n a b l e d and o n l y on e lo w output is p r o ­
du ced .
The d e c o d e r a c c e p t s a b i n a r y co d e d a d d r e s s on t h r e e s e l e c t l i n e s ,
S E L E C T 1 th ro u g h S E L E C T 3, and d e c o d e s t h e m to p r o d u c e a l o w output d e c i m a l
e q u i v a l e n t c o r r e s p o n d i n g to the d e s i r e d a d d r e s s .
The j u m p e r plug is r e m o v e d f r o m the ra d ia l s e l e c t o p t io n and i n s t a l l e d b e t w e e n
the pads d e s i r e d to a s s i g n the in d ep en d en t p h y s i c a l a d d r e s s o f the d i s k d r i v e .
T a b l e 3 - 1 i n d i c a t e s the l o g i c s t a t e o f the S E L E C T l i n e s f o r s e l e c t i n g e a c h d r i v e .
S E L E C T 1
1
0
1
0
1
0
1
0
0 = I n a c t iv e s t a t e o f i n t e r f a c e s i g n a l (high)
1 = A c t i v e s t a t e o f i n t e r f a c e s i g n a l (low)
The op tio n is c o m p r i s e d of 4 - t o - 1 0 li n e
T a b l e 3 - 1 .
D i s k D r i v e S e l e c t i o n
S E L E C T 2
1
1
0
0
1
1
0
0
3 - 1 4
S E L E C T 3
1
1
1
1
0
0
0
0
D r i v e
S e l e c t e d
0
1
2
3
4
5
6
7

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