Re: RS485 - XPL on the wire

["g8kmh" <lehane@xxxxxxxxxxxxxxxxxxx>]

Indeed, the original intention was xPL on RS485..since xPL already
has addressing. I took a rather simplistic view that in HA you could
afford a few collisions and that devices aren't transmitting very
often. It was also only around simple devices like light switches,
temp sensors, etc.

Others have mentioned DMX/DMX512 and I think there is a great case
for an xPL to DMX interface to drive dimmers.

I also found this:
http://caraca.sourceforge.net/

Lehane

--- In ukha_xpl@xxxxxxx, "Mal Lansell" <mlansell@f...>
wrote:
>
> > Hi All,
> >
> > http://www.hth.com/easytap/default.htm
> >
> > May be of interest.......
> >
> > I've alsways thought that RS485 was mainly about the
"hardware"
layer.
> >
>
> It is, but I think the OP wanted a method for transmitting xPL
messages over
> RS485, as opposed to something like DMX, where xPL would be used
(by a PC
> application) to drive a DMX controller that then sends DMX messages
over the
> RS485 connection.
>
> For sending xPL over RS485, we get to define our own unique system,
although
> in the absence of a definite application or hardware for this, it's
hard to
> say whether RS485 or some other network (such as CAN or Ethernet)
would be
> more appropriate.
>
> Mal
>
>
>
>
>
> > SNAP,  http://www.hth.com/snap/ which I know
many are aware of,
is one
> > protocol that can sit on RS485, as indeed is DMX512
> > http://www.dmx512-online.com/physl.html
, if I've got this wrong
feel free
> > to take me into a dark corner and tell me so.
> >
> > Regards
> >
> > Stuart
> >