National Instruments offers several cables and accessories that are compatible with the DIO connector.

Note These cables and accessories use a custom pinout that matches the PXIe-5644 DIO connector and maintains the 50 Ω transmission line environment. The use of other VHDCI cables is not recommended.
Category Part Number Description
Cable 196275-01 SHC68-C68-D4 shielded single-ended cable, 1 m
192681-1R5 SHC68-H1X38 high-speed digital flying-leads cable accessory, 1.5 m
Accessory 778592-01 CB-2162 single-ended digital I/O accessory
778747-01 SMB-2163 single-ended digital I/O accessory (rack-mountable)
Connector (cable required) 778914-01 Connector, .8 mm champ, 68 pos, VHDCI, through-hole mount
780389-01 VHDCI connector, 68-pin, vertical, PWB through-hole mount