2 cable and more pic

[SuB-ZeRo]

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?

[mister_e]

answer yes...

here is something to start...
http://www.picbasic.co.uk/forum/showthread.php?t=1192

[SuB-ZeRo]

I think u understand me wrong i am trying to explain like the picture...
for exemple slave1 =S1
S1 will read the main line and will wait call for S1
all the pics must connect to the main line.

[ronjodu]

Have you considered CAN controllers? I just aquired some samples from Microchip to do that same thing. No progress yet however.

[SuB-ZeRo]

Yes that's right.I am trying to do that.It's not impossible imposible things re that we can't do.And i will find a solition if i find i will share.

[mister_e]

you don't need to get some CAN stuff for that. TWO WIRES only

One scheme... there's a thousands other way but.. I2C could be interesting also

1 Busy line
1 TX/RX line


Master enable the busy line
all slave listen the Master for a x timeout delay
Master message done, Master disable busy line and wait reply of a Slave
Slave enable busy line and talk to Master


That imply to switch I/Os to input and output but this work...

OR if you want to do everything more easy.... another scheme


1. TX (From master TX to all slave RX)
1. RX (From all slave TX to Master RX with diode mixer and pull down/pull up resistor depending of your serial mode (inverted or true driven))