The National Instruments part number 781059-01 refers to the PXI-6682H, a PXI Timing and Synchronization Module designed to enhance the synchronization capabilities of PXI systems. This module features three SMB General-Purpose PFI lines, a TCXO 10 MHz timebase, and a programmable clock with a frequency range from DC to 1.5 MHz. It allows for precise synchronization among multiple PXI devices by generating clock signals and events at designated future times, as well as timestamping inputs using a unified system time. When installed in a compatible PXI chassis, specifically in slot 2, the PXI-6682H can effectively route clock triggers and messages, maintaining low skew of signals both within a single PXI chassis and across multiple chassis configurations.

Additionally, the module supports synchronization with external time references through protocols such as IEEE 1588, IRIG-B, PPS, or GPS. This enables the generation of synchronized future time events, enhancing operational efficiency. The 781059-01 differs functionally from the PXI-6682, primarily through the removal of one connector to facilitate compatibility with PXI Express systems. Though it does not have the capability to manage PXI Express clocks or trigger lines, users can bypass the PXI_CLK10 restriction by connecting a coaxial cable from the CLKOUT on the 781059-01 to the 10 MHz clock input on the rear of compatible PXI Express chassis. Furthermore, driving the PXI_STAR trigger lines necessitates the use of an additional PXI Express timing module, such as the NI PXIe-6672. This module operates under the NI-Sync driver software and is compatible with Windows operating systems, weighing approximately 220 grams.