def poll(self):
        rts = self.satellite.getRemoteTerminals()
        if len(rts) == 0:
            return 0
        else:
            if not self.pollFrame:
                self.pollFrame = []
                for rt in rts:
                    self.pollFrame.append(rt.getAddress())
                sorted(self.pollFrame)
            for index in self.pollFrame:
                for rt in rts:
                    if rt.getAddress() == index:
                        cmd = CMD.Command(index)
                        cmd.setToModeCommand(CMD.Command.transmitStatusWord)
                        self.bus.writeBus(cmd)
                        self.bus = rt.readBus(self.bus)
            return len(self.pollFrame)