Not sure if the output is the same as the AV8OR Ace, but this is the manual for that:https://www.bendixking.com/en/~/media/bendixking/files/pilot-guides/d200904000003_3.pdf
It says the USB port can be used for one or two RS232 ports.
Under Optional Equipment it lists:
3 005-03702-1017 Single RS 232 Serial Cable (90 degree 10 pin mini USB to single DB9 male connector)
4 005-03702-1027 Dual RS232 Serial Cable (90 degree 10 pin mini USB to dual DB9 male connectors) http://www.n416.com/AV8OR-AP.html
Whether you can find one or not is another matter!
Well, a bit of googling...https://www.gps.co.uk/bendix-king-av80r-rs232-interface-cable/p-0-172/
Once you've got both ends talking RS232 then you just need something to connect the two.
Just done a bit more googling.http://www.trioavionics.com/fr/Manual%20rev%201.9.pdf
It's a multi-function connector on the Trio. You might need to make up a special cable. it looks like pin 3 from the GPS RS232 goes to pin 7 on the Trio and pin 5 from the GPS adaptor goes to pin 8.