Re: Re: motion detectors: need some input

["Frank Mc Alinden" <fmcalind@xxxxxxxxxxxxxx>]

Hi All
Speaking of pirs , i have just received a couple of minature pir
heads from ozitronics and hopefully they are going to be used to inform
Homevision via my probe system  when a room have been vacated (after a
preset delay)....Look under security devices K76.......quite small although
i think i might mount them inside a small plastic box....More when i have
had a play
http://www.ozitronics.com/

Frank


----- Original Message -----
From: "mark_harrison_uk2" <mph@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Monday, January 10, 2005 9:24 AM
Subject: [ukha_xpl] Re: motion detectors: need some input


>
>
> --- In ukha_xpl@xxxxxxx, "Mal Lansell" <mlansell@f...>
wrote:
> >
> > I've read that PIRs can generate a lot of X10 messages - not only
> > would they block each others messages, but they would also
interfere
> > with any X10 message you wanted to send in response.  Personally,
> > I'd keep PIR traffic off the powerline completely.
> >
>
> We've done quite a lot of testing on the "multiple PIR
problem".
>
> In fact, the majority of the interference seems to happen in the RF
> domain - ie in sending the signal from the PIR to the TM (RF
trasceiver.)
>
> X-10 mains devices are reasonable (not great) at backing off and
> resending once you're onto the powerline. It's the one-way raw
> transmit through the air that's where you get your problems.
>
> It's worth noting that, while I run a training course that shows
> installers how to use X10 PIRs, I use wired ones myself :-) In my case
> I connect them up with Homevision, though if I didn't already have a
> Homevision, I'd definitely consider a VIOM.
>
> Regards,
>
> Mark
>
>
>
>
>
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>
>



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