Bill,
I think this should work based on a quick document review. You would want to wire the RS-232 out of the GNS 480 and set the port to "MAPCOM". NOTE: The 480 can only support the "MAPCOM" format on port 1 and port 5.
On your Garmin portable, you would want wire it to the RS-232 In port and configure the input to "Aviation In".
Based on my review of the GNS 480 install manual, MAPCOM appears to be the early version of the Aviation In protocol.
Good luck. If you try it, please report back here and let us know how it works.
Thanks,
Levi
Team X Project Manager
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