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STEP
PROCEDURE
4 .
P r e s s :
o n K e y b o a r d ( 1 8 ) .
5 .
T r a n s m i t DTMF t o n e s e q u e n c e f r o m s o u r c e .
6 .
DTMF t o n e s e q u e n c e ( u p t o s i x t e e n d i g i t s ) w i l l b e d e c o d e d a n d
d i s p l a y e d o n t h e VFD ( 3 7 ) .
7 .
I f a n o t h e r DTMF t o n e s e q u e n c e i s t o b e d e c o d e d ,
a g a i n p r e s s :
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