2x8 Opto-Isolated Digital Input Channels with (-) Input Common jumpers (Connected to the Host DAQ PC Cards 16 DIO I/Ps). For use with PCI-62C/63C/73C Digital I/O (DB-37F) or (IDC-40M), using 1:1 cables. Two IDC-20M connectors for accessing the 16 Digital I/Ps and 16 Digital O/Ps for use with other DAQ PC Cards or with the PC-43A1/2/3 DB-37F Connector Cable Screen / DGND linking jumper. High quality screw terminals for easy field wiring. Internal / External (+5V) power input is jumper selectable (300mA resettable fuse for PSU protection). There are four 3.2mm diameter holes for mounting or a DIN-RAIL Mounting Base may be fitted (recommended for quick hassle free installations). Dimensions: 107.5(W) x 160(L) x 23(H) mm