(1 ) T o use th e co u n te r in o n ly m o d e , th e re a r p an el A D D R E S S sw itch m u st
b e set to th e T A L K O N L Y p o sitio n , a n d th e ad d res s m o d e o f th e o th e r
devices co n n e c te d to th e b u s line sh ou ld also be set to o n ly m o d e . N o te ,
h o w e v er, th a t d u rin g o n ly m o d e th e c o n tro lle r sh o u ld n o t be u se d. If
th e c o n tro lle r is o p e ra te d d u rin g o n ly m o d e , th e co n tro lle r co m m a n d
w ill be d isreg a rd ed , a n d th e c o u n te r m ay fail to o p e ra te p r o p e rly .
(2 ) P o w er fa ilure d u rin g o p era tio n
If th e re is a p o w er failu re (in c lu d in g m o m e n ta ry p o w er fa ilu res) d u rin g
o p e ra tio n o f th e G PIB sy stem (in c lu d in g th e un iversal c o u n te r), n o rm al
o p e ra tio n ca n n o t be g u a ra n te ed afte r th e p o w er is re sto re d . N o rm a lly ,
th e c o m p le te sy stem is in itia lize d ag ain . P o w er fa ilure pro cessin g fo r
th e o th e r devices in clu d ed in th e sy stem m u st also b e c on sid ere d.
(3 ) C o n tro lle r in te rr u p t d u rin g d a ta tra n sfe r b etw e en devices
In th e G PIB sy stem , d a ta tra n sfe r b e tw e en d evices a p art fro m th e c o n
tro lle r is also po ssib le. If an in te rr u p t is g en e rate d in o rd e r to ad d a n o
th e r lis ten e r o r to sw itc h th e co n tro lle r to serial p o llin g m o d e d u rin g
d ata tra n sfe r (h an d sh a k e o p era tio n ) b e tw e e n dev ices, th e d a ta tra n sfe r
is su s p en d e d , a n d p rio rity given to th e c o n tro lle r in te r ru p t o p e ra tio n .
U p on c o m p le tio n o f th e in te rr u p t p ro ce ss, th e p re v io u s d a t a tra n sfe r
o p era tio n is re su m e d .
U su ally , th e sy ste m is to be p ro g ra m m e d so th a t th e c o n tro lle r w i l l
recog nize th e d ata tra n sfe r s ta te .
4-5-4. General Precautions during Operation
4-14
To Next Page
Loading...