Getting started is the hardest part. I have this screenshot from the radar's documentation with the hex of the host radar communication.
I also know
I believe that I want to use Serial1.begin(115200, SERIAL_8E1);
I know that the radar sensor doesn't need flow control. I have tested it without CTS/RTS connected.
So far so good. Also the Boron is a 3.3V logic device, so it requires that the radar device also have a 3.3V logic UART serial port. If it does not, you'll need a level shifter to whatever it uses, typically 5V TTL, RS232C (+/- 12V), or possibly 1.8V. There's more in the about serial page.
I got it working!!!