Given that TCAS will issue an RA (resolution advisary?) because of a dialogue between 2 or more aircraft TCAS's in close proximity i.e. it can tell one aircraft pilot to climb and another pilot to descend, what does the pilot do if instructed differently by ATC ( who can't see or hear an RA) is it mandated that the pilot should follow the TCAS?
Roll on ADS B and handling Mode S data on the ground at least more than just the 4096 code and height.