import serial

    ###################
    # PRIVATE CLASSES #
    ###################

    # wait acknowledgment for data reception
    def wait_ack(self):
        s = self.serialVM.read(1)
        if len(s) > 0:
            s = int.from_bytes(s, byteorder='little', signed=False)
            self.status = 1
            return(s)
        return -1

    def check_selection(self):
        self.serialVM.flushInput()
        self.serialVM.write(bytearray.fromhex("32"))
        req = self.wait_ack() #THIS SHOULD RETURN THE DECIMAL VALUE BUT RETURNS WRONG DECIMALS
        if (req != 254) and (req != 0):
            return req
        else:
            return False