There are today only 2 TCAS in operations I and II.
TCAS I ,is a receiver that only gives TAs . description and users manual here :
http://www.seaerospace.com/bfg/tcas791pg.pdf
TCAS II : the mandated system that issues TA and RAs in the vertical sense .
There are currently 2 software versions in use : 6.04A and 7.0 .
main differences > 7.0 is RVSM compliant and reduces the threat /sensitivity levels (margins ) to eliminate false alarms.
7.0 is meeting ICAO ACAS SARPS, 6.04A does not.
For a description and user manaul see here :
https://www.bendixking.com/servlet/c...499-0000_7.pdf
The horizontal RA s ( i.e. turns ) was planned with a so called TCAS III but R&D on it was abandoned long ago, and it is very doubtful that they will restart.