I seem to remember needing to let each command complete, and the motor to finish moving (there is a bit in my status register that flags this). Hmm, ok, need to consider this also, because I`m not waiting for time till it finishes moving.I think on my side it could be 5th bit in response first byte...

Sounds like you're making progress with it :) Somewhat of a progress was made, but now im really stuck :D I made my test program automatically do a status request every 200ms regardless of whether any test messages were being sent to make sure it stayed awake all the time. I`m sending command packe...

Got bit of time to work on valve again. So sending and receiving 4 bytes of data If in ID 0x00 data[4] 0x00, 0x00, 0x00 0x00 are being sent: ID 0x01 response is: 1st byte 0x40, 2nd byte cycles thru 4 values: 0xE0, 0xE4, 0xE8, 0xEC and rest two bytes are 0x00, 0xFD If in ID 0x00 data[4] 0xFF, 0b00000...

My progress with EVX valve - looks like I`m stuck now. My read code was off, today found out that when cycling thru ID`s, ID - 0x00 and 0x01 gave back status byte of 0x41, all other ID`s were 0x40. So looks like ID 0x00 is for motor command, tried to send different data and data sizes - {0x01, 0x02,...

Sorry - i hadn't noticed the above. This sounds very similar to something that I saw and used to find the control register (see my earlier link). Essentially this LSB of the 0x41 byte sounds like a transmission error flag, it is complaining that you tried to write to a non valid address, or to a va...

This might help? It's the commands for the I-Pace version of this valve and the process I used to find them. https://openinverter.org/forum/viewtopic.php?p=41795#p41795 Thanks, tried that already, but looks like Tesla valve needs to receive a bit different data? Because i looped thru every possible...

Ok i got it working its just a stepper motor indeed. The homing procedure isn't that nice like on yours i think. Best practice is to always have it at position closed anyway when stored away. Hi, nice work :) I also got Tesla valve, i can get status back from EVX in LIN address 0xC1, but cant get i...