Re: Re: RS485 - XPL on the wire

["Mal Lansell" <mlansell@xxxxxxxxxxxxxx>]

> 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
>