NI PXI-7842R is an R Series Multifunction Reconfigurable I/O module for the PXI platform. NI identifies it as a primary hardware module rather than an accessory, and the official model description specifies a Xilinx Virtex-5 LX50 FPGA, 8 analog inputs, 8 analog outputs, 96 digital I/O channels, and 200 kS/sec performance. This places the PXI-7842R within NI’s R Series family while distinguishing this exact SKU from related 78xx R Series modules by its specific channel mix and FPGA configuration.
For analog measurement and generation, NI documents 8 analog input channels with 16-bit resolution, a ±10 V input range, and software-selectable DIFF, RSE, or NRSE input modes that apply to all channels. NI also specifies a maximum analog input sampling rate of 200 kS/s per channel for NI 784xR devices. On the output side, the PXI-7842R provides 8 analog output channels with 16-bit resolution, a ±10 V output range, and a maximum update rate of 1 MS/s.
Digital and FPGA resources are intended for user-defined timing and control tasks. NI specifies 96 TTL-compatible digital I/O channels and documents FPGA resources for the NI 7842R/7852R as 28,800 flip-flops, 28,800 6-input LUTs, 48 DSP48 slices, and 1,728 kbits of embedded block RAM. The module also supports 3 DMA channels, and NI lists onboard clock frequencies of 40, 80, 120, 160, or 200 MHz with support for phase-locking to the PXI 10 MHz clock.
