I bought second arduino uno. And, first Arduino has example MotionSensorRS485, second Arduino has example GetwaySerialRS485. And i have got the same situation. So even Gateway on Arduino doesn't see MotionSensor. Next test i made, i disconnected MAX485 converters, and i connected UART pins from first arduino to the second one (UART = Rx(8) <-> Tx(9), Tx(9)<->Rx(8)) and GND. And i have got the same result. Gateway doesn't see sensor.