AVR-Chat

> From: Mike F. Schwarzer
> 
> ....
> Look at the MAX485/MAX487 RS-485 Drivers, or if you like for DualTypes.
> With an RS-485 Bus, you can go up to 100M with 125kBaud, at 
> least that was tested be myself.
> 
> The Protocol depends on your Software, so its also possible 
> to have Multi Master Access, from the AVR Side the simplest 
> way is to use the UART.

Thanks Mike,

I've downloaded the datasheet and it looks like a winner.

I was wondering about how to be sure the ends of the bus are terminated so as to
minimize reflections.  Is the best way to do this by connecting a scope (mine is
100mhz) and driving the line watching for reflections and adjusting the
termination for minimum reflections, or am I overcomplicating/oversimplifying
this?  I have no idea what the "characteristic impedance" of the cable in the
ground is ...

Cheers,

Chuck Hackett
"Good judgment comes from experience, experience comes from bad judgment"
7.5" gauge Union Pacific Northern (4-8-4) 844
http://www.whitetrout.net/Chuck