First, our apologies for the delay in replying to forum questions. We have been busy with a complete web overhaul, including these forums, and are now able to devote much more time to responding.
Second, our new website includes extensive information on third-party integration, including with Garmin and exactly how the XRX information is displayed. This info can be found at
http://www.zaon.aero/integration.
To answer your question, the Garmin process traffic the exact same way it does for TIS info. Any traffic will be displayed on the moving map. Alerts will show up in a pop-up screen, regardless of which page you're looking at (similar to terrain alerts).
As for voice alerts, you have a few different options. The Garmin generates a female alert that can be heard by connecting to the 1/8" audio out jack or hard wiring into the audio leads contained in the power cable. In addition, all of the standard XRX alerts can be used via the 1/8" out jack on the XRX. Both units will also emit a beep. The XRX breaks alerts into two categories, advisories and alerts, with corresponding audio. The Garmin only has one (alert).
The XRX does blank out the screen so that the additional load on the processor to repackage the information and send through the data port is balanced by not having to refresh the display. The XRX, in a sense, becomes something like the XM "puck"... a receiver-only up on the dash.