USBDIO24 (fitted with 50 way header connector, pin compatible with the NI DIO24 (6503) digital I/O card

USBDIO24, mounted on standoff pillars above a 24 channel DIO24Mx relay card (fitted with a perspex cover)

USBDIO24 connected to a DIO24STAM screw terminal adapter via a ribbon cable ((E50Ribbon or DIO96Ribbon).  This option gives screw terminal access to all 24 channels of the DIO card and also 0v/+5V

USBDIO24 - face view