On Sun, Feb 13, 2005 at 02:21:47AM +1300, Russell McMahon wrote:
> >I am needing to talk to a device that speaks RS485.  Can a PIC UART 
> >talk RS485 without a protocol converter of some sort?
> 
> Yes.
> RS485 is a physical layer specification. It has push pull voltage 
> levels on a balanced line. Actual data can be async serial.
> Someone will now complain that I have over simplified things AND done 
> violence to the standard. :-)

I guess I'll be the first to step up.

Here's how I read Lawrence's question:

"Can a PIC UART talk RS-485 (RS-232) without a protocol converter of some
sort (like a MAX232)?"

If that's the correct interpretation, then the answer is NO. A
RS-485 transceiver is required between the PIC and the RS-485 network.

BAJ
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