On my system, the TCAS warning (and display) appears to be triggered by speeding-up the SimRate. No issue when the rate is x1 but as soon as X2 or higher is enabled, the TCAS alert sounds...
@beep747
There is a good tutorial on setting TCAS here:
https://www.youtube.com/watch?v=IrJ5VE3Gew8&feature=youtu.be&fbclid=IwAR0BkoXr468k1LMMoSMcRJVAvMPPzaxwsRaw3EhqYKHiuXdZQYHopR8dtcM