Using a Trig, I set the given squawk. However when we got it, we had to set it up wth the aircraft code. I never check this. There is no way of doing so as far as I know.
You can check, but why would you? It is unique to the airframe and would only be changed with malicious intent or by someone who should never have been allowed close to an aircraft.
To enter configuration mode, hold down the FN button whilst switching on the transponder. Configuration items can be changed using the Code Knob and the ENT button. Pressing FN advances to the next configuration item.