I regsitered as an installer at zehnder's site and downloaded the software I could find there. I do see activity now on the serial-usb converter, both rx and tx, but the software says "No MX found". I think this tool is not for my WHR 930. Another tool says no/broken connection, but that's for a ...

My old WHR950 has a RS485 connection (NOT RS232!), so I use a RS485 to USB adapter. If you also have RS485 then make sure you connect only signal A, B and GND. My WHR950 also has 12V on its connector which can destroy your RS485 to USB adapter. The software I used is the official StorkAir ...

Hi all. No progress on understanding the protocol of my unit, but a discussion did start on:
https://www.promixis.com/forums/showthr ... 0&p=153224

I could be that you have the same issue that I have: slightly different communication protocol. Did you try the official "Maintenance software" from Stork / Zehnder. You can download it from this thread: https://www.promixis.com/forums/showthread.php?18946-Control-protocol-StorkAir-WHR950/page3 If ...

Hi all, In the meantime I figure out what the issue is... My unit is using a different protocol over the RS485 line. The StorAir maintenance tool communicates perfectly fine with my unit. If I sniff the com port while the tool is active I see the following messages coming by (some of them are also ...

After reading this topic I became enthousiastic about controlling my StorkAir WHR950 unit with Domoticz. After examining the PCB of this unit I found out that I have version 1.00 of the PCB and firmware (at least is says so on the sticker of the EPROM). This board has a Philips 80C552 microcontroler ...