Opto controllers have galvanically separated input (the receiver signal) from power accumulators, therefore it's necessary to use independent power supply for the receiver and servos (4-5 NiXX or 2-3 LiXX with linear voltage regulator, such as MAX BEC).
SPIN opto controllers are provided with two JR connectors. Connector on the longer three-line cable with black ending is to be linked to the receiver. Connector on the shorter three-line cable with red ending is intended for communication with JETIBOX; for programming or data reading connect it into slot marked imp. + - on JETIBOX.