The National Instruments PCI-7831R is a high-performance Reconfigurable I/O Device belonging to the R Series, designed for flexible and diverse control applications. It features eight independent 16-bit analog input channels, capable of a maximum sampling rate of 200 kS/s, and eight independent 16-bit analog output channels with a maximum update rate of 1 MS/s. Powered by the Virtex-II FPGA, this model incorporates 96 digital I/O lines, which can be configured for custom logic, standard input/output operations, or counted applications. The PCI-7831R employs the NI-RIO driver software, ensuring compatibility with various application development environments such as LabVIEW, LabVIEW FPGA, and LabVIEW Real-Time modules, facilitating a fully programmable FPGA experience without the need for specialized engineering expertise.

The device supports single-ended voltage output in its analog output mode and provides various input configurations, including RSE, NRSE, and DIFF, all selectable through software. Additionally, the PCI-7831R incorporates features such as 40 built-in 18 x 18 multipliers and 720 kbits of embedded block RAM, enhancing its computational capability. It is equipped with two digital I/O connectors and a 68-pin female high-density VHDCI I/O connector, offering robust connectivity. Operating within a temperature range of 0 °C to 55 °C, the device meets various industrial requirements and has a compact footprint of 6.7 x 4.3 inches while weighing only 0.25 lbs. The PCI-7831R is no longer available directly from National Instruments, but it remains accessible for purchase and repairs through Apex Waves, ensuring continued support and availability.