If you are referring to the hand-held control unit, it is normally referred to as the RC unit, and the manual for using it is contained in the normal manual for the P3 Standard, which you can download from here: https://dl.djicdn.com/downloads/ ... al_v1.4_en_0112.pdf
I am taking an on-line course offered by Emery-Riddle University on sUAS and can you believe, the FAA calls the RC (Remote Control) the "Ground Station".