@iungo - Andrey, having read your earlier post and visited www.ioton.ru I can see that you have experience in hardware development, so thanks for commenting.
I can see in your first post above that you have described a way to test the function of the MRI-3.3D48 without attaching it to the door controller, by using the Raspberry Pi 3.3V & 5V power lines.
Is your opinion that the MRI-24D48 has an internal series resistor or other current limiting circuitry, so that the internal LEDs are not damaged when +24V is applied to A1?
Paul
