Benefits of Using the RMIO and RDIO Cables

Updated Jun 19, 2018

Reported In

Hardware

  • Multifunction Reconfigurable I/O Device

Issue Details

R Series Multifunction RIO devices have cable options including the SHC68-68-S cables and the SHC68-68-RMIO, SHC68-68-RDIO, or SHC68-C68-RDIO2 cables. There are the benefits of using the RMIO and RDIO cables over the standard SHC68-68?

Solution

There are multiple cables that can connect your NI R Series device to a terminal block. Depending on the signals your are connecting and the model of your device, the optimal cable may vary. The differences and similarities of the cables are listed below.

SHC68-68-RMIO - This high-performance cable in the figure below was designed specifically for the RMIO connector on R Series devices, used for Multifunction I/O. It has individually shielded bundles separating analog and digital signals. Each differential analog input channel is routed on an individually shielded twisted pair of wires. Analog outputs are also individually shielded. Furthermore, each digital signal is twisted with its own wire to digital ground and each twisted pair is individually shielded to minimize crosstalk. This is the recommended cable for connecting to the MIO ports of USB R Series, PXI-784xR, PXI-785xR, PXIe-784xR, PXIe-785xR, or PXIe-786xR cards.
 

SHC68-68-RDIO - This high-performance cable in the figure below is similar to the SHC68-68-RMIO cable in that each digital signal is routed on an individually shielded pair of wires, where each signal is twisted with its own wire to digital ground.
Note: This is the recommended cable for connecting to the cRIO-9151 R Series Expansion Chassis.
Note: This cable is not recommended for USB R Series, PXIe-782xR, PXIe-784xR, PXIe-785xR, or PXIe-786xR cards.
 

SHC68-C68-RDIO2 - This high-performance cable in the figure below is similar to the SHC68-68-RDIO cable in that each digital signal is routed on an individually shielded pair of wires, where each signal is twisted with its own wire to digital ground. The cable has a typical impedance of 50Ω and has a VHDCI connector on both ends.
Note: This is the recommended cable for connecting to the DIO ports of USB R Series, PXI-782xR, PXI-784xR, PXI-785xR, PXIe-782xR, PXIe-784xR, PXIe-785xR, or PXIe-786xR cards.

SH68-C68-S - This lower-cost cable in the figure below has basic shielding with 34 twisted pairs of wire, but no special consideration was given to the signal pinout of R Series devices. 

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