UART output at 100mV

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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I am trying to get my jetson nano developer kit to communicate with an Arduino mega over uart. I couldn’t get the two to talk to each other so I looked at the signal with an oscilloscope. The output of the jetson is 100mV not 1.8V. I am using the J44 headers on port ttyS0. I have tried all of the other UART headers as well and ports ttyTHS1\ttyTHS2. on the 8 pin I am getting 10mV. I am using cuteConsole to generate the UART signals for testing.

Here is a screenshot from my scope it is an analog discovery 2. I am just sending random characters here. The baud is 4800(i made it slow for debugging), and the configuration is 8N2. This is on the J44 header on port ttyS0.

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I did connect the Arduino and jetson without a level shifter at one point but would that have broken the Jetson? Also, It is not the attenuation on the oscilloscope I made sure. I have done a lot of searching for a solution and I have not been able to find a solution or anyone with the same problem?

Has anyone else had this problem? Is my Jetson just broken? is there any way to fix it?

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Hi,
Are you able to get debug message through the UART port if you connect the port to a host PC? This is the default usage and should work fine. If you even cannot run this successfully, probably the Jetson Nano developer kit is broken.

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