Let me tell u more of my problem.
Just think 10 or more pic and a master pic to check others.
The slaves will do their jobs but when the master asks it will answer the master.
For exemple lets give names to the slaves as S1,S2...S10 and the master will be MAS
the MAS is asking to the S2
MAS=S2 re u there?
S2 = yes i am here and online
MAS=what is the count?
S2= 100
MAS=ok i got the count clear the count.
S2=count cleared!!!!
then.....
MAS=S4
MAS=S5....
NOW THE REAL QUESTION
is it possible to do all of these in 2 wire lines?