Also, the Dynon EFIS's output the RS-232 serial data to capable Txpdrs, which at the moment include the GTX-327 and 330 (as well as the now defunct but nice SL-70).
The 330 will output traffic to both the GRT EFIS and the Chelton EFIS (both require an ARINC 429 converter).
Cheers,
Stein.