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TDC1000-GASEVM: No START signal

Part Number: TDC1000-GASEVM

Good morning,
i'm using TDC1000-GASEVM in order to evaluate the distance between two 220 kHz transducers.
I've read the user's guide but if i connect an oscilloscope to the START pins the signal is zero.
Even if i measure the signal on TX1 it is zero.
Can someone help me?
These are the setting:

And these are the connections:

Thank you.
Luigi