This product is a USB2.0 compatible terminal that extends digital signal input functions on a personal computer.No power supply from the outside is required due to USB bus power driving.Equipped with 16 non -insulated TTL level input.In addition, a protective circuit (surge protection) is used for the input circuit and a terminal connector with easy wiring.A Windows driver is attached.- [Extended module] Bus specification USB 2.0 Size Y type Used connector 2X Screw terminal stand 14-pin [Digital input/output] number of input points 16 points Output points - two -way score - Response speed (input) 200nsec (max.) Response speed (output) - Operate voltage (input) 5VDC-TTL Operate voltage (output) - input circuit Non -insulated TTL level input (negative portion) Output circuit - Built -in power supply -