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Yes, he could - unless it wasn't working correctly. Then he'd need the logic analyzer or a scope to find out why. The logic analyzer has a nice feature called "automatic baud rate detection" that can give you a quick answer to dead com if you've made a simple divider mistake.
I have also used that personally to solve a UART problem - but it was between two electronic devices, rather than a board and a computer. There was a problem with the message encapsulation resulting in ignored messages and this tool quickly found that issue for me.
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