I have a 91 Camaro I'm trying to data log with my Tuner Pro RT version 4 & 5.
My files match that are loaded. Tuner Pro shows cable attached and working. Shows connected but no data coming in. Help!

 

Did you plug up the cable first, start the software and then turn the vehicle on? And did you select the right com port in tunerpro?

You can also go to Tools > Preferences > ALDL/Emulation to make sure the settings are right and then "Test for valid cable using settings" to make sure it isn't the cable causing your troubles. Also when you click connect and the blue box on the bottom left says connected that doesn't mean that the cable is actually connected for some reason, I'd assume its just better to use the test in the preferences to make sure the cable is good to go.

 

I plugged the cable in after start up of Tuner Pro and yes it is the correct port.