68-Pin VHDCI Cables: Digital Instrument Cable Guide
Updated Jul 25, 2022
This guide addresses many common questions for the most popular NI Digital 68-pin VHDCI cables: the SHC68-C68-D4 and C68-C68-D4. NI 68-pin VHDCI cables are primarily used on many of the NI Digital hardware family models, such as NI 653X series, the NI 654X series, the 655X series and the 657x series. The cables feature 0.8 mm 68-pin VHDCI connections, with the option for an unshielded cable, enhanced performance noise reducing cable assemblies. Whether you are purchasing new, using a replacement cable, or creating a custom fixture, this guide provides pinouts, wire mappings, color codes, wire gauge, connector part info, and grounding or shielding information as a short summary.
Using the Digital Instrument Cable and Accessory Guides
This guide is intended to cover the most popular 68-pin VHDCI cables which are designed for use with NI Digital Instruments including Digital Waveform Instruments (previous High-Speed Digital I/O), Digital Pattern Instruments and High-Speed Serial devices. It does not cover similar cables for other NI product lines, even if they share the same connectors.
This section provides a brief summary of acronyms and terminology used on these 68-pin VHDCI cables. For more in depth information about other connectors as well as the terminology listed on this page, visit the main Digital Instrument cables guide.
Naming Summary for this Guide
SH- Shielded cables. Shielding can include individually shielded pairs and/or shielding for the entire cable assembly.
C- Cables with a "compact" 0.8 mm VHDCI connector.
-D- Wire pairings designed specifically for digital applications.
Differences and Similarities between 68-pin VHDCI Digital Cables
NI offers a wide range of cables to work with different Digital products, serving a variety of needs. While the wire pinout may be the same on most cables, each offers different connectors, shielding, and twisted pairs.
This section contains a summary of information frequently sought when installing or customizing 68-pin VHDCI Digital Instrument cables. More detailed information can be found in the linked additional resources below. Dimensional drawings can be downloaded for free and are available in 2D and 3D formats; they contain size measurements, part numbers, wire mappings and other helpful information. They are available in several popular formats, such as PDF, AutoCAD (.dxf, and .igs (IGES)), STEP (.stp), and .prt (Pro/E).
SHC68-C68-D4 Quick Specifications and Documentation
High Performance, Shielded Cable. For most Digital Instrument VHDCI connections, NI recommends that you use the SHC68-C68-D4 cable. The SHC68-C68-D4 cable is a newer design of the SHC68-C68-D5, featuring additional shielding to improve crosstalk and noise performance.
Basic Shielding Cable. Offers cost-effective basic shielding, but does not have shielding for full cable assembly. For most shielded Digital VHDCI connections, NI recommends that you use the SHC68-C68-D4 cable.
SHC68-H1X38 Quick Specifications and Documentation
High Performance, Noise Reducing Cable for Custom Fixtures and Breakouts. This special VHDCI to flying lead cable is intended for use with a custom breakout fixture, rather than the VHDCI connection used on most NI Digital Instrument accessories.