This content is not available in your preferred language.

The content is shown in another available language. Your browser may include features that can help translate the text.

Digital Logic Compatibility for R Series Multifunction RIO Devices

Updated Feb 23, 2018

Reported In

Hardware

  • USB-7845
  • USB-7855

Issue Details

What digital logic compatibility do the NI R Series Multifunction RIO Devices have?

Solution

Digital logic compatibility varies between R Series cards. The following table summarizes the supported logic levels.
 
DeviceSupported Logic Levels
USB-78xxR, PXIe-78xxR, PCIe-782xR 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V
PXI-78xxR, PCI-78xxR, PCIe-781xR,
PCIe-784xR, PCIe-785xR
5 V, 3.3 V (see note below)

USB-78xxR, PXIe-78xxR, and PCIe-782xR devices can receive a maximum input voltage of 3.6 V as described in their specification documentation. These devices have software-selectable logic levels as listed above.

PXI-78xxR, PCI-78xxR, PCIe-781xR, PCIe-784xR, and PCIe-785xR devices are only compatible with 5 V and 3.3 V digital logic levels. These devices can receive signals from 3.3 V or 5 V TTL or CMOS devices. They may also drive signals to 3.3 V or 5 V TTL devices and 3.3 V CMOS devices. They cannot directly drive a signal to a 5 V CMOS device. The Voh of the PXI-78xxR, PCI-78xxR, PCIe-781xR, PCIe-784xR, and PCIe-785xR is not high enough to guarantee a valid logic high at the receiving device, so you must add an external pull-up resistor to 5 V on the digital output line. Please see the user manual for more information.

WAS THIS ARTICLE HELPFUL?

Not Helpful