nx slotSlot. How to use the Slot command in NX. NX 1980 In this video, we learn about the Slot commands of NX. #slot #nxcad #nx1980 Please SupportWhat is SLOT NX? By simply attaching an option board to the slot, you can build a flexible system with a wide variety of interfaces such as DisplayPort™, 12G-SDI, HDMI and DVI-D.