4 digital inputs and 4 digital outputs with RS-232/485 interface.Features:4-channel photoelectric isolation voltage input and 4-channel photoelectric isolation repeater outputWorking power supply: 9-30VDCIsolation voltage: 2,500V rms4-channel photoelectric isolation voltage input: 0-24VMaximum ON/OFF voltage 110V/DC 0.3A 30V/DC 1A for DC inputElectric interface:double 10-bit binding postWorking environment: -25℃ to 70℃, relative humidity" 5% to 9..