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From: "Dan" <dtoma@xxxxxxx>
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Date: Mon, 14 Apr 2003 15:46:12 +0300
Subject: Re: [ukha_d] Re: Sensors / Switches / etc
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<tt>
Hi Andy,<BR>
<BR>
> One of the things that you highlight is the single pair of wires
used,<BR>
>from
daisy chained off one another using a single cable. A number of
potential<BR>
problems occur to me here:<BR>
><BR>
> 1. If one device fails does the whole chain stop
working?<BR>
Only in the less probable event when that device force the bus in an
active<BR>
state, but this can be prevented when the device is designed.<BR>
<BR>
> 2. The single point of failure for one 'room' is the CAT5
socket<BR>
You can use two or more pair/sockets/cables if you want
redundancy.<BR>
<BR>
> >> 5. Devices don't require a PC (or other
interfacing device) to run.<BR>
> >><BR>
> >As you have even a single PC in the home, then you dop not
need another<BR>
> >one.<BR>
><BR>
> Ahh, but the point is, your serial devices stop working if they
have<BR>
nothing to talk to (eg PC Failure)<BR>
<BR>
They do not stop woorking if the bus is still powered.<BR>
<BR>
> Ethernet devices still function, it is not inconceivable(sp) that
you<BR>
could create a network of devices<BR>
> that operate without the use of a PC using protocols like xAP and
xPL or<BR>
even a custom protocol.<BR>
<BR>
You can do it too with SWSB. Just use a standalone serial
controller.<BR>
<BR>
><BR>
> >There is any stand-alone home automation framework,
network based, which<BR>
> >does not use a PC?<BR>
> ><BR>
><BR>
> Not as far as I know, but for example somone *could*
interface<BR>
Homevision's serial port with a Rabbit<BR>
> and have devices talk directly to homevision, eliminating the PC
entirely.<BR>
You can do much more with a monitor/keyboard-less cheap pc....<BR>
<BR>
> >Please try to convince me...:-))<BR>
> ><BR>
><BR>
> Do I really need to? It sounds like you want to try anyway
:D<BR>
Yup!... I want to test both..(for the moment I have only the serial bus,
but<BR>
xAP is next.):))<BR>
<BR>
> - The only downside added is there is an additional
cost.<BR>
..better say..... "very big additional
cost"..:-)<BR>
<BR>
> There is no reason that you could not create your serial devices,
and then<BR>
simply interface<BR>
> the serial connection with a device like the Rabbit<BR>
> - instantly converting your device (with a little
programming)<BR>
> to a networked one...<BR>
<BR>
Do not forget that SWSB does not mean standard serial port!<BR>
You can bridge the two "networks" at the host (PC)
level.... maybe a xAP<BR>
enabled bridge between SWSB and ethernet.<BR>
<BR>
<BR>
><BR>
> Go on, you know you want to... :D<BR>
More than ever...;-)<BR>
<BR>
<BR>
<BR>
And now the BIG QUESTION for all of you:<BR>
<BR>
There is any widely available and well established SWSB protocol (maybe
with<BR>
some devices available on the market) for Home Automation?<BR>
I do not intend to reinvent the wheel... it is not my way of
doing<BR>
things..:-))<BR>
<BR>
Dan<BR>
<BR>
<BR>
<BR>
</tt>
<br>
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