... , V/F control.Speed setting methodBy keypad, by analog, by PC through serial communication portSpeed setting precisionDigital command ... ±0.01%(-10 +40)analog command±0.1%(25°C±10)Speed setting resolutionDigital ... portRS-485 connector RS485+,RS485-4 bits LED displaysetting frequency, output frequency, output voltage, output current, motor speed, output torque ...