In LonTrend range, there are 2 ways to control wiper. Dry contact or RS485 (Pelco D protocol), it depends on models. To use dry contact control, your camera must be equipped with the I/O feature, once your camera passes the circuit (connected to I/O of your camera), the wiper will be activated. To use RS485 control, your camera must support RS485 Pelco D protocl in order to communicate with LonTrend wiper. For correct product selection, please consult with your sales representative to get further information.