@martin-kudláček Hey Martin, I got me one of those things :)
I connected it to the Extension, set the device id to 5, connected and then pressed the 'scan' button.
It shows this error right away: https://imgur.com/a/mVWeGa7
In the mean time, the Rx light flashes a few times and then it stays on.
Edit: hmm, I've set the pins to be port 15 and now both lights are flashing intermediately. That seems to be right...
weird that it doesn't work on 5...
edit 2: I've toggle the dipswitches again to be set to 5, but still doesn't work. I've set the slave address in the qModMaster to 15 and then it works. It looks like it ignores the dipswitches. I've powercycled the device, so it should take the dip switches in consideration...
edit 3: I'm able to toggle the relays be sending value between 0 and 127 on 'write single register'. Device seems to work fine, but only on slave address 15 then