Portenta H7 Lite Serial Ports

Projects Programming
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First time posting here so please correct me if this is not the way to post

I have a portenta H7 lite and need to be able to hold the UART2 TX (J2-25) and UART3 TX (J2-26) low for 10+ seconds to measure it with a DMM as part of testing. Is this possible? Currently what I see on an OScope is that the signal goes low but only for a millisecond or so which obviously can’t be picked up with a DMM

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