The NI-6589 is a digital I/O adapter module that, when combined with a PXI FPGA Module for FlexRIO or the Controller for FlexRIO, creates a digital instrument for interfacing with 20 low-voltage differential signaling (LVDS) digital pins. A digital I/O adapter module for FlexRIO can be used to do real-time interfacing of standard protocols and implement customized protocols. The NI-6589 can sample digital waveforms at up to 1 GHz and includes support for common LVDS voltages.