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[February 18, 2016]


I finally figured out tonight why I wasn't receiving ADS-B data on my GRT Sport EFIS's. I emailed a member on VansAirForce.net who had a similar setup to me - NaxWorx ADS600-EXP and a GRT Sport EFIS. He said it was working fine for him, and he had it wired to Serial 4 (Mine was on Serial 2). I did some research on my GRT EFIS, and it turns out Serial 2 is not a high speed interface, but Serial 4 is!


I also found a document on GRT's website (www.rvplane.com/pdf/Sport Dual with NavWorx-SL30.pdf on how to wire the GRT Sport to the NavWorx Transceiver. This document shows how to wire the EFIS to a NavWorx ADS-600B transceiver - the pinout on the NavWorx side is slightly different for the ADS600-EXP device. However, it does clearly show it is wired to Serial 4.


Although Serial 4 showed to not have any devices plugged into it on my MDF screen, I discovered the Serial 4 port was used for the ARINC input/output for the AutoPilot and Garmin 430W. Luckily I had Serial 4 free on the PFD EFIS, so I made a quick jumper wire to test out the functionality.


I configured Serial 4 for ADS-B at 115,200 baud.


BOOM! Valid ADS-B messages from the NavWorx box! It was pretty chilly, and late in the hangar when I got all of this figured out, so I called it a night. I have to fix the routing of this one wire, then I should be good to go! Very exciting!

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