Difference Between D1/D2/D3/D4 SHC68-C68 Cables

Updated Nov 30, 2023

Reported In


  • SHC68-C68-D3
  • SHC68-C68-D4
  • SHC68-68-D1

Issue Details

NI makes several different SHC-C68 cables. What is the difference?


The SHC/SH68-C68 cables have 4 different varieties, D1, D2, D3 and D4.  It is important to note the connector type and recommended devices.

The D1 is a single shielded cable with female D-type connectors and is recommended for Counter/Timer devices.

The D2 has been discontinued because of a change in one of our suppliers and is no longer available, and has been replaced by the D4. If you still have D2 cables you should be able to use them interchangeably with the D4.

The D3 has a 100Ω impedance and VHDCI connectors and is recommended for digital data and control (DDC). This cable is double shielded 

The D4  similar to the D3, but is a  only has a single layer of shielding and has a 50Ω impedance .
SHC68-C68-D Cable Comparison Table
Connector Afemale 0.050 D-typeVHDCIVHDCIVHDCI
Connector Bfemale 0.050 D-typeVHDCIVHDCIVHDCI
UseCounter/TimerDiscontinuedDDCHigh-Speed Digital (HSDIO)

Additional Information

For more information on what cable to use with your device see the DAQ Multifunction I/O Cable and Accessory Compatibility page, or the Digital Instrument Cable and Accessory Compatibility page.