I am installing the following things on my panel.
AF4500
Digiflight-II Autopilot
530
SL40
327
Aera portable GPS

My Steinair harness has the AF4500 serial port 1 Tx/Rx connected to the 530 and Digiflight, serial port 2 Tx connected to the 327, and serial port 4 Tx/Rx connected to the ARINC converter (for 530 & Digiflight). I’m wondering if there is anything I should do with serial port 3. Might I connect it to the Aera? If yes, would that be for the purpose of selecting the Aera as the source for the AF4500 CDI and Bearing?