GTX 327 Pilot's Guide
Page 6
... Dependent Surveillance-Broadcast (ADS-B) technology improves situational awareness and flight safety. For changes to ATCRBS interrogations when STBY is controlled by the 8 and 9 keys. COUNT UP TIMER: Controlled by START/STOP, CLR, and CRSR keys. Contrast is annunciated. The transponder does not respond to the GTX 327 parameters, contact your Garmin authorized service center.
... Dependent Surveillance-Broadcast (ADS-B) technology improves situational awareness and flight safety. For changes to ATCRBS interrogations when STBY is controlled by the 8 and 9 keys. COUNT UP TIMER: Controlled by START/STOP, CLR, and CRSR keys. Contrast is annunciated. The transponder does not respond to the GTX 327 parameters, contact your Garmin authorized service center.