I have asked Itead if it would be possible for them to change the firmware for the T1 EU 2ch with interlock mode, but unfortunately no response to my question.
They pointed out that I could use "scene" to accomplish an interlock mode. But that means in case of failing internet both channels could be turned on resulting in destroying the motor of my roller shutter. Only 1 ch. is allowed to be turned on at all time.
I have tried to use "scene" but can't find out how this works. At the list "execute devices" I don't see the T1 EU. See pictures. What do I do wrong?
I managed to figure it out. See film/pictures.