Thank you for your effort.
May I better reformulate the voltages: my Input voltages are 4,6v for Low and 8v for High., and the TRB140 is powered with 12v.
So, as you see, I am within the recommended voltages .
Is not it strange that the issue would come from voltages, which are the same when the TRB140 is good working, or not working ?
It seem to me that the solution could be in some bits or bytes errors in the Software ?
Can you verify if you replication is really the same as my step-by-step guide ?