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Heatmiser RS485
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 Posted: Thursday Jan 10th, 2008 10:18 am
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palmlodge
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I've got a Heatmiser control system for the heating system - multi zone, touchpad, etc

This is a vote for a new UCM that can talk into Heatmiser - and Comfort can then totally control the heating system. Cytech have the protocol documentation.

 

For any Comfort users who have a normal central heating system (or an alternate heating control thats standalone) - Heatmiser do a direct replacement for about £40 (US$80) - this could then be connecte to Comfort.

Last edited on Wednesday Jan 16th, 2008 04:25 am by palmlodge



 Posted: Wednesday Jan 16th, 2008 04:27 am
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Pgordon
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Aye, - I'd buy that for a dollar....

consider this a vote in favour!

Paul G.



 Posted: Wednesday Jan 16th, 2008 05:10 am
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mikegriff
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I would vote for it

Mike



 Posted: Wednesday Jan 16th, 2008 05:54 am
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ianh100
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Assuming the UCM would work with Comfort 1 then I would go for that!



 Posted: Wednesday Jan 16th, 2008 03:42 pm
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fredbasset
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Another vote here, I have Heatmiser in all zones and a Comfort system.

A good call for this I think.

Regards
Fred



 Posted: Wednesday Jan 16th, 2008 06:59 pm
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phlwht
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I'd have one of those if they existed!

We likewise have a number of PRT-N stats, and the touchscreen - woud be great if comfort could control it all based on time, other temps (solar hot water, external and domestic hot water would be great) and occupation.



 Posted: Thursday Jan 17th, 2008 02:34 am
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palmlodge
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Some good examples of control might be :

 

1. Allow Comfort to control times and temp. setpoints

2. If Away Mode, dont put the heating on

3. If vacation mode, dont put the hot water on, nor the heating

4. Put controls on the Comfort touchscreen ?

5. Any others ?

 

Heatmiser PRT-ENs just tell relays to go on or off - they dont switch the load directly themselves. They should pretty much work with any type of heating system.

They are about the same price as a standard off the shelf unit, and gives the advantage of 'networking' - you can easily swap out your existing sensor for the high load version (not the EN's) - and still have networking.



 Posted: Friday Jan 18th, 2008 08:16 am
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JimNoble
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This sounds very useful.

We're going to be extending the house this year, and intend to fit Comfort in the process.

We have Smartfit already so will fit the UCM to control that (if we end up keeping the smartfit controller), but we'll need additional zoned control for the new rooms. Smartfit doesn't support multiple zones, but the heatmiser range looks like it could fit the bill.

Jim



 Posted: Monday Jan 21st, 2008 03:32 am
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garym999
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We have also looked at this briefly and the cost/performance of heatmiser is attractive.

As I understand it all zone control is local to the heatmister stat, that is temp readings, timers etc. but these are all blurted over a RS485 bus. And can be overridden remotely aka thier touch panel.

So Comfort should be able to report/adjust zone temps & provide timer control of different zones readily.

Another intresting product although closed is Honeywell's CMZone. If this could be hacked it offers retrofit options for those with radiators. I know Hometronic is the baby here but it starts to add the expense & duplicates Comfort in many ways.



 Posted: Saturday Jul 12th, 2008 06:40 am
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AJTaylor79
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Hi Guys

Can anyone offer me advice on how to get my computer communicating with my heatmiser thermostate, I have bought a RS485 convertor but have no idea after that.

Any help would be appreciated.

Thanks

Andrew



 Posted: Tuesday Sep 2nd, 2008 09:05 am
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mwillett
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AJTaylor79 wrote:
Hi Guys

Can anyone offer me advice on how to get my computer communicating with my heatmiser thermostate, I have bought a RS485 convertor but have no idea after that.

Any help would be appreciated.

Thanks

Andrew

Hi Andrew,

I've just order a Heatmiser PRT-N, I have an RS485->RS232 convertor so aim to connect this to my computer. I have the protocols which don't look too difficult so I've written the basic code. Once the equipment arrives, I'll give it a go.

Are you (or anyone else) interested in helping out in getting the code working or improved ?

Mike



 Posted: Tuesday Sep 2nd, 2008 11:55 am
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palmlodge
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Mike

I have the same kit so yes ! :-)

If we cant go direct to Comfort, how about a homeseer plugin ?

Last edited on Tuesday Sep 2nd, 2008 11:55 am by palmlodge



 Posted: Tuesday Sep 2nd, 2008 03:28 pm
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AJTaylor79
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Hi Guys

Where did you get the Protocols from?

A homeseer plugin sounds fantastic by the way its exactly what I am looking for!!!!!!

Last edited on Tuesday Sep 2nd, 2008 03:30 pm by AJTaylor79



 Posted: Wednesday Sep 3rd, 2008 04:28 am
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mwillett
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Got the protocols from technical support at Heatmiser.

I can send them to you if you wish.

They're not especially well documented - but hopefully not too difficult to reverse engineer from what I've got.

The Heatmiser run off 12v so my first issue will be connecting them up somehow.

Mike



 Posted: Wednesday Sep 3rd, 2008 04:33 am
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palmlodge
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Here you go - protocols

Attachment: Heatmiser Protocol.zip (Downloaded 161 times)



 Posted: Saturday Sep 6th, 2008 11:24 am
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mwillett
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Hi,

Does anyone know much about the PRT-N wiring.

I know it runs off 12V, but what about the Amps/Watts ?

Whats an appropriate transformer to use ?

Mike



 Posted: Saturday Sep 6th, 2008 11:36 am
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garym999
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Not sure but it will only be mA. Mine is powered but Comfort. I only use the relay side of things at the moment.

I to would like full Comfort integration. There is an RS485 UCM but we would need a translator module to pass values in/out of counters etc.



 Posted: Sunday Sep 7th, 2008 03:03 pm
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garym999
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Just to clarify. I have a very simple heating senario at the moment...

House is equipped with a combi boiler with all radiators having thier own thermostatic radiator valves. At the moment Comfort just simulates the time clock on the boiler. With the benifit that the heating gets switched off to save energy in away mode.

I have the heatmiser stat connected to comfort via its internal relay contacts such that it turns on the heating regardless if the temp gets below 12deg. This means the house is quick to warm up when we return and that it keeps the damp away.

Now the next part would be to not use the relay but pass the temp via the network to a comfort counter allowing a far more flexible programing options and senarios.



 Posted: Tuesday Sep 16th, 2008 04:04 pm
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mwillett
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Hi,

My PRT-N thermostat has arrived. I've wired it into a 12v transformer and connected it to a RS485/RS232 converter and then connected it to my computer.

I've written some very simple Perl code to talk to it. Surprisingly it all just worked.

I'm now going to improve the code and extend it to support the full protocol.

If anyone is interested, in the details or helping out - let me know. BTW, I've connected to a Linux PC but I guess it would work with Windows Perl as well.

Mike



 Posted: Wednesday Sep 17th, 2008 02:17 pm
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AJTaylor79
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Hi Mike

This is fantastic news!

Can I ask what RS485/RS232 converter you are using (Make and Model)

I don't know much about programming but would love to know more about how you managed to get it talking using perl. Have you got anything you can send me?

Many Thanks

Andrew




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