thank you friends,for your valuable time spared for this thread
i think the discussion so far is so productive and might help a lot of guys who intends
to do some thing new

 

actually i dont have a particular project in my mind,but i just intend to do a protocol of my own
if its BlackNet i ll like to make some changes of my own,or just something different
i had have once wrote i2c for mc51,even with some mistakes
and some guidance or help(sugesstions) i need is in designing the specifications like,
{
How much data will it carry?
How fast?
How far apart are they? and how reliable if they are placed this much distace from one another?
}

 

Those 3 questions depend on each other. And they also depend on the hardware, the type of cable, the type of driver, the voltage of the driver, the amount of interference in the environment etc.

I really suggest you build a test setup with 2 PICs, and try out the performance of just sending serial down 2 wires between the PICs over different distances. That will give you real-world info on how fast a baudrate you can use before you get data corruption.

 

ok i ll try...