This product is a USB2.0 -compatible digital input / output unit that extends the input / output function of the digital signal from the USB port of the computer.It supports 5-50VDC digital signal input and 5-50VDC digital signal output.It is equipped with 16 points of photocoupla insulating input (current sink output compatible) and 16 photocapula insulation open collector (current sink type).Equipped with a protective circuit of the output transistor (surge voltage protection, overcurrent protection).- [Extended module] Bus specification USB 2.0 Size N type Used connector 4x 3.5mm pitch 10-pin 2 piece terminal stand [Digital input/output] Bus USB Function I/O input 16 points Output 16 points Response speed 200μSec (max.) Operate voltage Input 0-50VDC, output 0 to 50VDC input circuit Photoba plastic insulation input (compatible with sink output) Output circuit Photobapura Insulation Open Collector Output (Sink Type)