I’ve been trying to get hold of a specification of the communication protocol for my heatpump and today IVT, the manufacturer of my heatpump, gave me a call. I’ve not received the protocol yet, but what they did tell me sounds promising.

I’ve had quick a look at the communication protocol and to my suprice, it is a very simple protocol. As far as I can tell, all commands are nine bytes in total; stx, cmd, six bytes of data and the checksum, which is the xor:d value of the data.

It’s hardly worth the trouble to reverse engineer the protocol since there already is a program available to read the data I want, but it is fun none the less

I’m such a tech-freak

I pulled a cable across the entire house today so that I can hook up he PC with the heat pump. Thankfully I could pull the cable through the attic so it is hardly visible

Total length is about 25m so it should work allright

The first thing I’ll write about on this blog is my shiny, newly installed geothermal heatpump, seen on the right. It’s an IVT Greenline HT+ C6, with an additional volume tank of 100L.

So what’s there to write about such a thing then? Well, it’s not something that interests the general public, but I know that people with a system like, or similar, to this one likes to read about other people’s experiences.

I’m currently waiting on some hardware that will enable me to connect my PC to it and log temperatures and other interesting data over time. The hardware in question is actually just an RS232 cable, but with added galvanic isolation between the PC and the heat pump. I guess I could have built it on my own, but it was cheap enough, and it comes with a nice (at least it looks promising) program to log the data.