BSG(Button Signal Generator) emulates the button signal that controls the car stereo.
CarPC JoyCon Exd itself supports BMW IBUS, AUDI ‘99-’04(LIN) and VW(Volkswagen) ‘99-’04(LIN) by BSGd pin.
BSGr(Button Signal Generetor Resistive) is an external device connected through J2P BUS.
BSGr generates resistive button signal. (J2P BUS is a signal wire that connects CarPC JoyCon Exd and its peripherals.)