GTN 650 data line help needed

P101 on the GTN650 has three lines that have to do with ADS-B.
Piin 8 is ADS-B out. Pin 22 is time mark B and pin 3 is time mark A.
Does anyone know how to activate these lines? On an ARINC reader, there seems to be no signal on either time mark out line.

The ADS-B+ our is what is needed, and it is RS232, not ARINC429. Most ADS-B transmitters don?t require the Time Mark wires. I think the Navworx is the only one asking for that signal. They should always be active, but it?s not a signal that you can read that I know of. If you are using a ModeS-ES transponder, you only need the RS232.

Thanks!

Thanks Jesse !!! I appreciate the reply and information. Have a great holiday.
BTW, I sent you a customer early this week....

Jesse, I put an O-scope on the timing lines. Just straight DC.
Wonder if they need to be enabled?