When interfacing a TAS-6xx Active Traffic to Garmin GTX-345 ADS-B IN Transponder to Blend into the Traffic Picture, the existing "NO Avidyne DISPLAY" GRD jumper, J1-15, needs to be REMOVED.
The Garmin GTX-345 emulates the RS-232 Control Data of an original Avidyne ATI-150, 1/2 3ATI Indicator/Controller.
This is especially important when changing the interface from a Garmin G1000 System where the initial control is over Arinc-429.