This an old post but yes, the the Dynon D-180 does output a continuous stream of data. I use a Insignia™ - 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset - Black to connect the EMS DB-9 connector. I use a Raspberry pi with a USB port to capture the data. The Raspberry pi is also my ADSB in and is running the Stratux software. The Stratux software runs on Linux. Here are the sample commands that I use to capture the output stream:
sudo mkdir /mnt/data
sudo mount /dev/mmcblk0p3 /mnt/data
cd /mnt/data
sudo chmod 0777 /mnt/data
stty -F /dev/ttyUSB0 115200
cat /dev/ttyUSB0 > EDM5.csv