RE: RE: Dallas temp sensors

["i.bird@xxxxxxx" <Ian@xxxxxxx>]

An interesting thought Justin........ I have just built an RS232 (serial)
to RS485 half duplex converter. Using this I don't see why you couldn't
join the serial ports on any number of PC's together. You would need some
smart programming to go with it for you had in mind (IIRC from your post)
but this may be a neat solution? You could have one monitoring traffic etc.
and doing something if something went wrong. I guess the only thing is that
the connected devices would have to be able to work at half duplex and
understand collisions (handshaking?) otherwise things may get into a bit of
a pickle.

If you're interested and want to bat it around a little more just
shout.

Ian

Original Message:
-----------------
From: Justin justin@xxxxxxx
Date: Fri, 28 Jun 2002 15:12:36 +0100
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Dallas temp sensors


Paul,

I know this won't be any good for you (Canadian distributor & build
it
yourself) but your post reminded me of this outfit http://www.projectx.com/
(8 sensor board for $31). I thought it might be of interest to others
though.

Like you, I am making do with 4 port Quasar temp board. If I knew what I
was
doing I would have a go at building a parallel port controlled serial
switcher. Ian Birds reply to my splitting serial cable post (thanks
Ian!)
and this HS thread
http://homeseer.infopop.net/3/OpenTopic?a=tpc&s=697298074&f=6302952361&m=5472956675
got me thinking about that. Hmmm!

Having said that, I took delivery of an 8 port serial card last week so
lack
of ports isn't a problem at the moment :-) It does mean I'm retiring my
SIIG
2 port card though, if you (or anyone else) interested!

Justin.

> -----Original Message-----
> From: Paul Gordon [mailto:paul_gordon@xxxxxxx]
> Sent: 28 June 2002 1:43 PM
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Dallas temp sensors
>
>
> Chaps,
>
> I've come to the conclusion that the 4 inputs provided by my
Quasar
> electronics temperature board is going to be insufficient, and
> I'd like to
> increase the capacity to something like double that...
>
> One option would obviously be to buy another 4-port temp. board, but
that
> requires another COM port on the HA PC, and I really don't want to
lose
> another port for this...
>
> What alternative devices can I use to interface DS18020's to a COM
port?
>
> I would like:
>
> - Single COM port
> - 8 or more temperature probes
> - UK supply source
> - off-the-shelf device (no soldering please!)
>
> Any suggestions?
>
> TIA
>
> Paul G.



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