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I'm back
Today i tried to connect with running engine, still doesn't work.
With ignition on, there's 12V on ecu, with running engine 14V so everything is ok.
I've checked ground and obd connection again.
Then i opened socket and removed all cables, left only 3 cables power, ground, diagnostic (photo)
Stil doesn't work in car!!
I took it home to check, everything work on bench
I recall that, i have two ECUs and i always check both

Tomorrow i'll try to supply power out of car, so only diagnostic pin remain.
Then inverse, i'll try with power from car and my cable between diagnostic pin of unit and opcom.
That's my last idea...