I have the following devices I need to connect to the 4500 through the serial ports:
- GTN 650 (GPS/Nav/Com)
- SL-30 (Nav/Com)
- VP-X (electronic circuit breaker)
- ARINC 429 module
- GTX 330 (transponder)

Since there are only four serial ports, I need to choose which one doesn't get connected.

- The GTX330 is already connected to the GTN650 and Dynon D-6 (Backup EFIS). I would think that would be the one I don't connect.
- Or, since I'm already connecting to the GTN650 with the ARINC 429 module, should I sacrifice that connection?

I welcome your suggestions.