Req. 5.3.14.2: "LAT In or Out of SAA"
The FSW shall receive information from the SC (contained in the Ancillary Data message), indicating if the LAT is in or out of SAA. This information may be used, in conjunction with commands from the ground, to aid in SAA transition processing.
Basis (help)
[Derived]
Context (help)
Test(s)
This test shall first verify the electrical characteristics of the LAT 1553 interface, then demonstrate (in conjunction with a spacecraft simulator) that the LAT can exist on the bus without responding to messages directed to other remote terminals. Next, processing of telemetry requests shall be demonstrated, followed by exercising the command interface to the LAT and verifying that all commands and command data are correctly interpreted. Commands need not be executed to successfully carry out this test. Timing measurements for the standard message traffic shall also be performed.
013a: Operational Modes - Safe Modes
This test shall verify that the SIU FSW can perform the correct transition of the LAT into Safe Mode upon command, can properly execute the Safe Mode algorithms, and can perform the subsequent recovery via Engineering Mode. It shall also verify the correct response to SAA entry commands and subsequent recovery.