Demonstration Agenda

• Command and Telemetry/Science Data Interface
• LAT Communications Board Driver

The September 2004 FSW Demonstration (actually held on October 1) covers two major areas of functionality:

The Science Data Interface

This portion of the demo showcases FSW's ability to deliver properly formatted and addressed data from an SIU through an Event Builder Module and out over the high-speed LVDS science data interface between the LAT and the Spacecraft. In flight, this data is bound for the Solid State Recorder, where it is stored until retrieved from the ground.

As in the August demonstration, the Spacecraft is represented by the Spacecraft Data Interface Simulator (SDIS), a simulator provided by Spectrum Astro, Inc. The LAT is represented by the Instrument to Spacecraft Interface Simulator (ISIS), which contains a single SIU along with primary and redundant GASU (with Command/Response Unit, CRU, and Event Builder Module, EBM) and primary and redundant PDU.

The LAT Communications Board (LCB) Driver

This portion of the demo shows the ability of the newly-designed LCB driver to control LCB devices in separate CPU crates. In the flight system, all LAT-internal communications are mediated by the LCB driver.

For today, 2 CPU crates, each containing an LCB board, will communicate as controlled by the LCB driver. This shows that the FSW development team has an infrastructure in place to begin the development and deployment of multi-CPU (SIU/EPU) systems.