Bally 5000 Plus, Manual

Page: 298 / 388

1 1 . RX/TX BOARDS
I nt roduct i on
T h i s s e c t i on cover s t he r ece i ve r / t r an sm i t ( R X /T X ) boa r d s .
ob j ec t i ve s o f t h i s s ec t i on a r e a s fo l l ows :
PARTS OBJ E CT I VE S
T h e p a r t s and
T h eo r y o f Oper a t i on
Boa r d Assemb l y
Conne c t o r Loca t i on a n d Use
C i r cu i t Descr i p t i on
T r oub l es hoo t i ng Know how t he R X / T X boa r d funct i on s
Loca t e t he componen t s w i t h p a r t numb e r s
Know t he use o f t he v a r i ous connec t o r s
How t he c i r cu i t s wo r ks
Boa r d S ch ema t i c
Know how t o t roub l e s hoot t he boa r d
Downs i ze d R X / T X schema t i cs for r e f e r ence
ASC I I --Ame r l ca n S t an d a r d Code f o r I n f o r ma t i on I n t e r c h a nge
per pend l cu l a r --At r i g h t ang l es
( 90
deg r ee s ) to t he hor i zon t a l ; a ve r t i ca l l i ne
or p l ane .
P r eQues t l on s
R e a d t he f o l l ow i ng Ques t i on s a n d wr i t e down a n y o t h e r Ques t i on s .
1 . Wha t a r e t he vo l t a ges on e a c h boa r d ?
2 . W h a t supp l i e s t he vo l t age t o t he R X / T X po r t a b l e boa r d ?
3 . I s t h i s d a t a t r ansm i ss i on s e r i a l o r p a r a l l e l ?
4 . Wh a t l og i c l eve l I s a pos i t i ve vo l t age f o r R S 2 3 2 ?
Theo r y o f Ope r a t i on
T h i s R S 2 3 2 opt i ca l commun i ca t i on I I nk I n t e r f aces t h e s l o t m a c h i ne to t he HHU
t r ansm i t t i ng se r i a l ASC I I code . T h e s e r i a l d a t a t r an sm i ss i on uses pos i t i ve ( + )
and neg a t i ve ( - ) vo l t ages . T h e + vo l t age I s a l og i c LOW ( 0 ) ; t he - vo l t age
i s
a
l og i c H I GH ( 1 ) .
1 1 -2