And you’re using blue IMS? Tac20s are slow. In the bottom right corner it’ll say no device connected, then direct connection and bounce back and forth for a minute or 2. As long as it’s doing that, it will connect eventually. If it just says no device connected, something is wrong with your serial adapter, cable, or something. Serial cable should be straight through, no Null Modem. You f you’re on a job with other cars networked together make sure the group number is correct. On a job like that it would be written in the controller door or something if it isn’t group 1.