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ery c o m mon b etw ee n m obil e p hone
o pera to rs , e n ab li n g s u bsc rib ers to u se th eir p hones in m an y p arts o f th e w orld . A P C w hic h is
c o nnecte d to th e m ic ro -c o ntr o lle r u sin g a s e ria l c o m munic a tio n th ro ugh R S232 c a n b e u se d f o r
m onito rin g a n d tr a n sm is s io n o f th e c o ntr o l s ig n als to th e m odem . T he m on ito rin g is a ls o d one
b y in te rf a cin g a L C D to th e m ic ro co ntr o lle r. A T co m man d s w ere u se d fo r c o ntr o lli n g th e
f u nctio nali ty o f m odem .
M ain h ard w are r e q u ir e m en ts :
Ø Ren esa s S K P16C 62 P S ta rte r K it P lu s
T his co n ta in s th e m ic ro -c o ntr o lle r. (u se d fo r co ntr o llin g th e dif fe re n t ex te rn al
d ev ic es c o n necte d a s p er t h e S M S r e ce iv ed )

Ø G SM m odem ( G M 28 f ro m S ony -E ric sso n)
T his G SM /G PR S t e rm in al e q uip m en t i s a p ow erf u l, c o m pac t a n d s e lf c o n ta in ed u nit
w ith s ta n dard c o nnec to r in te rfa c e s a n d h as a n in te g ra l S IM c ard re ad er. It is u se d
f o r re c eiv in g th e S M S f ro m th e m obile d ev ic e a n d th en to tr a n sm it to th e R en esa s
S K P.
Ø A M AX232 c h ip
T his c o nverte r c h ip i s n eed ed t o c o nvert a T TL l o gic f ro m a M ic ro co n tr o lle r ( T xD
a n d R xD p in s ) t o s ta n dard s e ria l i n te rf a c in g f o r P C ( R S232)
Ø A D B9 c o nnec to r
T his t a k es t h e s ig n als c o m in g f o rm t h e M AX232 c h ip t o t h e P C .
T he t y p ic al a p p lic ati o ns o f t h is s e ria l m odem i s f o r d ev elo pin g a w id e r a n ge o f e q uip m en t l ik e
à S ecu rity a n d a la rm s d ev ic e s
à M onito rin g a n d c o ntr o l d ev ic e s