Maybe similar to 480 w/ GRT
Here are the 480 setting I used to get connectivity between my GNS480 and GRT EFIS. Not sure if this will help but it may get you a little closer. When you're checking your settings, make sure the Baud rate on the 480 matches the requirements on the Dynon.
(I couldn't figure out how to get the columns to line up, so I'm adding some periods on the lines for spacing)
GNS480 Serial Ports
Channel....RX........Baud.......TX............Baud
1.............FADC......9600......MAPCOM.....9600
2.............NONE........0.........NONE...........0
3.............IRDA.......9600.......IRDA..........9600
4.............NONE.........0.........NONE...........0
5.............SL30........9600......MAPCOM......9600
6.............GTX32......9600......GTX32.........9600
7.............NONE.......0
8.............NONE.......0
ARC 429
CH-IN........SEL.........SPEED.....SDI
1..............ADC.........LOW........ALL
2..............EFIS.........LOW.......SYS1
3..............NONE.......NONE.......ALL
CH-OUT........SEL.........SPEED.....SDI
1..............ARINC429......LOW........ALL
2.............ARINC429.......LOW.......ALL
On the CH-OUT settings, I have a note where CH1 is labeled VOR ILS and CH2 is labeled GAMMA 429. Without pulling up the config pages on the 480, I don't know if those labels may have changed when I did a software update on the 480.
I don't recall what Serial port 5 really does. I've got a SL40 but I don't ever use any communication between the 480 & SL40. Also, Serial port 6 may not really do anything. My encoder data use to pass through the 480 to a GTX327 but when I upgraded to a GTX330, I re-wired it to send the encoder data straight to the 480