Re: Re: Displays round the house - architecture...

["Dave McLaughlin" <dave@xxxxxxx>]

Great idea and something along the lines of the CAN bus system I am
slowly
working on. Being CAN bus based, allows you to have multiple masters on
the
2 wire network and not have to worry about collisions as you would with
RS485, which is really a master slave network and not suited to
multi-master. TCP/IP on ethernet is another way as this is a multi
matser
interface.

Dave...
----- Original Message -----
From: "PatrickLidstone" <patrickl@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, August 12, 2002 4:46 PM
Subject: [ukha_d] Re: Displays round the house - architecture...


> Some random thoughts:
> An alternative approach is to let each *display* take the decision
> about what to display locally - transmit message text(s) and
triggers
> to all devices. (Note that it is the trigger event, not the
trigger
> criteria that is transmitted to a display). I can see a number of
> advantages in this approach:
>
> -  There is no cental controller to fail; it is a distributed
> architecture
> -  Triggers can be generated from *any* network connected
device,
> possibly including other display units (perhaps with keypads?)
> -  Complex conditional logic can be applied (not necessarily
excluded
> with your original design, depends on what the output server does)
> -  Local control and centralised control can be achieved
> simultaneously using the same infrastructure with a minimum of
> additional work.
>
> Configuration information for each display is read from server(s)
at
> boot time. This server could also cache recent events so that a
> display shows current information immediately on re-boot.
>
> I think this architecture extends beyond just displays to provide
> (one possible) foundation for an HA network protocol. I could
ramble
> on, but I'd wager that a detailed discussion is probably outside
the
> interests of the majority of the list.
>
> Patrick

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