Heatmiser RS485

[noelpilot]

Hi all,
Have just come across this googling for heatmiser info.  I\'ve got v3 of the PRT-N thermostat and am interested in what I can do with remote/internet control of it.

If I\'ve read this post correctly it started out voting for a UCM interface to Comfort but also there\'s been mention of people interfacing directly with the v2 version with the rs485 converter.

I\'m guessing then that this is an alternative to buying the network modules that retail for £300 ish and upwards from heatmiser.  Has anyone managed to progress with any of the v3 units? 

Not knowing anything about perl or coding in general really, can anyone explain how it could then be used?  Does the perl essentially give you control of the thermostat? i.e. i could automate it through a home automation system such as indigo on the mac, homevision, homeseer etc?

Thanks and apologies for all the questions.

Noel

[swanseamosque]

Wow - this is exactly what I wanted e.g. an API for heatmiser.

I want to install a huge system linked to a sql database so it switches the heating on from that instead of relying on its limited 4 event timer.

Someone appears to have succeeded in linux server controlling their heatmiser installation here:

http://groups.yahoo.com/group/ukha_d/message/147813
http://groups.yahoo.com/group/ukha_d/message/147722

Someone else managed to develop a basic guide (attached).

Anyone got good progress (with supporting sourcecode)?

[stevejoyner]

Hi Ian,

Do you have any more example checksums for the V3 heatmiser protocols you could post?

I have implemented the example code in the spec in VB and it looked like it was working in that it gives me the correct checksum for a \'read all\' command as per your previous example.  Now I come to try and write data back to the stats, they are not responding so i\'m wondering if my checksum code is working

Cheers

Steve

[stevejoyner]

I now have this working, that is read and write communication to both V2 and V3 heatmiser stats from VB on windows and from PERL on Mac-OS and Linux.

If anyone wants any details, please get in touch.

Steve

[slychiu]

Congratulations, thats very interesting. Do you have a description on what is possible with the interface? Any screenshots?

[timmywo]

Hi stevejoyner,

I have purchased the \"12v Network Touchscreen Programmable Room Thermostat - Heatmiser PRT-NTS\" with the aim of accessing this from my server.

Could you please share the details on how you are currently setup?

Many thanks!
tim

[timmywo]

Hi,

I have installed my \"PRT-NTS\" and all looks good!

Can someone share their setup please? What software and cables are you running? Would this work for the cabling RS485->Cat5e->RS232? With this: http://www.dealextreme.com/details.dx/sku.6040

I have all the floorboards up so would like to run the cables now, if someone can share their software and setup would be very helpful

thanks

[admin]

I suggest you send a PM (private message) to stevejoyner by right-clicking on his user name, as he may not be monitoring this topic

[timmywo]

thanks admin, I was and now have done so.

Ill post details on this list when I have them, will be helpful for others

[northview]

I know this thread is a little old now, but was hoping someone might be able to point me in the right direction getting a Heatmiser Version 2 thermostat to communicate on its RS485 port.

I have a UDS100 that I\'m using to communicate with the stat via a TCP connection.  Problem being that whilst I can see bytes being written to the thermostat, I don\'t get a reply from it.

I\'ve documented my setup along with some brief code here : http://rs485.olley.com/rs485.htm

Any advice / suggestions would be greatfully received.