... accuracy±5% Set reference voltage supply output1 port, +10V, 5mAControl voltage supply output24V,100mAAnalogy input2 terninal, No.4 ... voltage and current inputAnalog meter output1 terminal, 0/4~20mA or 0~10V available for itDO frequency signal output1 port, ... DC/1ASerial communication portRS-485 connector RS485+,RS485-4 bits LED displaysetting frequency, output frequency, output voltage, output current ...