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The FlightFactor A320 is a very popular and realistic aircraft model in X-Plane. Due to the way that it works, it requires some additional configuration work to interact with PlaneCommand.

Here are the steps to get it working:

Download and install the profile. Download the profile here, and save it to your X-Plane 11/Resources/plugins/PlaneCommand_v3.1.0/profiles/ directory.
Put PlaneCommand in debug mode. You'll need to open the file X-Plane 11/Output/preferences/planecommand.json, and change "debug": "false" to "debug": "true".
Install the FF A320 publish.txt file. Download this file and save it to X-Plane 11/Aircraft/FlightFactor A320 ultimate/data/publish.txt The exact path may be different, depending on how your aircraft was installed. What's important is that publish.txt is inside the data directory. This ensures that the A320 will publish the correct datarefs so that PlaneCommand can control it.
Manually reload profiles every time you fly the aircraft. After the aircraft has loaded, go to the Plugins menu to Plugins > PlaneCommand > Debug > Reload profiles. I know this is annoying.

That should be enough to get PlaneCommand interacting with the aircraft. The parking brake, flaps, landing gear, landing lights, taxi lights, beacon light, strobe light, nav light, seat belt light, no smoking light, altitude, heading, airspeed, altimeter, and the autopilot, autothrottle, and approach buttons should all work.

There are unfortunately a number of limitations that I'm working to overcome:

Speed hold, heading hold, altitude hold, and vertical speed hold push/pull knobs don't work.
Vertical speed target rate can't be set.