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PXIe-5160 Analog trigger problem

Hi,

 

I'm trying to record a waveform on the UART TX line as I send it on the bus from my modem. I can't seem to find a way to trigger the waveform recording on the CH0.

I've tried several ways to resolve this, looked over ten different examples and even crosschecked the line with regular scope to be sure I have proper voltages..... but still no luck.

 

I'm presenting the full VI in the attachment and I sure hope someone can find where my problem is located.

 

Thank You!

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