RE: Thermostat with RS232

["Julian Stuhler" <julian.stuhler@xxxxxxx>]

I took delivery of a TR15 kit last week - it really is a very neat unit.
However please be aware that the unit is only designed to switch 24vAC
and UK heating systems seem to need a thermostat capable of switching
240vAC! I also needed to move the location of the thermostat as the
thermostat and control unit wouldn't talk to each other properly over
the existing 3-core & earth cabling between the old thermostat and the
heating system. I used some 4-core security cable instead and it works a
treat.

I had a fun weekend wiring it in but I wasn't able to complete the job
as Maplins didn't stock the 24vAC relay I needed to allow it to operate
the thermostat input on my existing heating system. I eventually managed
to order one yesterday (from www.cse-distributors.co.uk). Hopefully I'll
be able to complete the job this weekend.....

Julian



-----Original Message-----
From: Kevin Hawkins [mailto:lists@xxxxxxx]
Sent: 25 February 2003 00:17
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Thermostat with RS232


RCS do some - the TR15 and TR36
http://www.resconsys.com/products/stats/serial.htm



-         but  not cheap - the TR36 is particularly nice as I believe it
has
a graphic LCD display screen and some buttons that can be programmed to
display automatically some user defined menus. I have been thinking of
getting one for a while from the US.



Kevin



-----Original Message-----
From: Dean Smith [mailto:ukha@xxxxxxx]
Sent: 24 February 2003 23:48
To: Ukha_D@Yahoogroups. Com
Subject: [ukha_d] Thermostat with RS232



I'd like to be able to control the temperature of my CH thermostat
remotely
via a PC

One route would be to have Temperature sensors connected to the PC, and
then
have the PC directly control the On/Off of the Central Heating (Which I
can
do now via Comfort and some relays to bypass the timer control for an
extra
hour when I want it). I'd like to avoid though having the PC as
absolutley
necessary for normal running - prefer it just as a means of varying the
temperature when required.

So anybody know of....

A Thermostat capable of switching 240V
Temperature Set Point controllable via RS232
being able to Poll the Temp would be a bonus.
Remote temperature sensor would be Ideal aswell.

And of course it has to be *cheap*. So Honeywell Smartfit is out ;-)

Thanks

Dean