Communications Protocol Choices

[mpgmike]

i2c would be my last choice , pbp has no slave implementation, no hardware implementation

you make no mention of transfer speeds , frequency or data size

As for transfer speeds, I intend to use a Rotation variable in the Master that polls one peripheral MCU each pass of the Main loop. Transfer size is 2 bytes; first byte is what the data is (Temp) while the second is the value of that variable (71).

[Dave]

Here is something I found quite a while ago. Use it as a starting point...

[mpgmike]

Thanks Dave, I downloaded it and will give it a thorough looking over.