... I2T, over-voltage, under-voltage, overheating, over speed, overproof protection;* Green light for on, red light ... 1, 2, 3, 4 respectively from the outer to inner side.no plug in, position mode is pulse/direction;plug in 1, speed ... control, speed input by Pos.ff;plug in 2, ... torque control, torque input by Pos.ff;plug in 1 ...