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I've been emailing back and forth with Hunter Allen of Vanderbilt.

I simply had to use this command:

sudo chmod 777 -R /dev/ttyS0

and it began working.

I have tested it out successfully with the C++ Velocity Node from the p2os-vanderbilt tutorials (with a few minor adjustments).

Thanks for all your help y'all.

I've been emailing back and forth with Hunter Allen of Vanderbilt.

I simply had to use this command:

sudo chmod 777 -R /dev/ttyS0

and it began working.

Additionally, if you are using a USB connection, use the following:

sudo chmod 777 -R /dev/ttyUSB0

I have tested it out successfully with the C++ Velocity Node from the p2os-vanderbilt tutorials (with a few minor adjustments).

Thanks for all your help y'all.