Heatmiser RS485

[mwillett]

[user=1947]AJTaylor79[/user] 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

[palmlodge]

Mike

I have the same kit so yes ! :-)

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

[Guest]

Hi Guys

Where did you get the Protocols from?

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

[mwillett]

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

[palmlodge]

Here you go - protocols

[mwillett]

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

[garym999]

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.

[garym999]

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.

[mwillett]

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

[Guest]

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