I'm going 232T from Stratux to serial one receive (white / orange wire) on 4500 and 232Gnd from Stratux to serial one ground (White/Blue wire) on 4500. I have changed the setup on serial one of the 4500 to ADSB 115k.
I still don't see anything on the 4500's for traffic or weather. The "about" screen shows nothing passing through via ADSB. I've checked wiring, checked all the config that I can find but still nothing.
If you're not seeing the counter increment on the 4500, it's not picking up any valid ADSB data on the serial input. That points to either a wiring issue (it sounds like your wiring is correct) or a config issue with Stratux.
I'm still running the old Stratux version in my plane, because it's been working fine so haven't seen the need to fuss with it -- can you post the version number of your Stratux build and maybe someone else can confirm it's working for them?
Most likely culprit would be the serial output setup on the Stratux.
1/ what serial output dongle are you using? Is it for sure providing RS232 levels and not TTL?
2/ have you programmed it for the "Stratux Serialout" descriptor so the box knows that's how it should be used?
3/ Have you set the port speed in Stratux to match your 4500? (115200)
I'd start with a fresh Stratux install, and connect the serial port to your computer for troubleshooting -- you can use Putty or a similar program to monitor the port to be sure the Stratux is sending data.
Once you know your Stratux is providing output on the bench, then reconnect it to the 4500.
Finally, once you have the 4500 receiving data from the base build, then go back and modify the build if needed to adjust the alert flags (though the mod I detailed should no longer be required with ChiefPilot's contribution noted earlier.)