1. RFA 8 – Command & Control System Definition
RFA 8 Specific Request:
ISOC does not yet know what system it is using to process Observatory Housekeeping Data or perform the commanding
Response
ISOC command and control system will be a hybrid of ITOS and software developed at SLAC

2. Proposed ISOC S/W Architecture
All State of Health requirements satisfied within ITOS
No req’ts on MOC that require LATOPS layer
MOC/GSSC
ITOS
Cmd DB
SOH trending and display
Data
Cmd
LATTE Ops  LATOPS
Science data/performance trending
Register load generation
Relational database interaction
Pipeline/SAS interactions

3. Architecture Drivers Minimize V&V burden and total cost
Maintain all science capabilities
Simplify interfaces and allow early testing
Recognized that neither of the previously considered options were particularly attractive
ITOS/Commercial packages don’t accommodate complexities of science data
Homegrown system doesn’t have heritage, not ready in time to make project timelines.
Most of additional code needed duplicates that in existing packages
 Studied hybrid solutions

4. ITOS/Astro RT Trade In favor of either
Both AstroRT and ITOS would provide basic instrument health and safety functions
Telemetry display
EU conversion
Limit checking and monitoring
Trending
Command and telemetry database access
Both products have learnable interfaces and scripting
AstroRT uses LabView for display and Perl scripts for automation
ITOS displays are reportedly easy to create, uses STOL for input

5. ITOS/Astro RT Trade Against either
Requires use of ITOS or Astro-RT specific interfaces and scripting
Both have ITAR issues
Limitations are not fully understood
Believe limitations will not affect monitoring and trending of housekeeping data – only science and instrument diagnostics

6. ITOS/Astro RT Trade In favor of AstroRT
LAT is using AstroRT for LAT flight software testing
Against AstroRT
Does not handle character strings – not sure if that’s an issue for us (it is with GBM)
Commercial product costing $$$ upfront and for support throughout program life
Probably unable to alter AstroRT code
In favor of ITOS
MOC and GBM will be using ITOS
May be able to alter ITOS code or have changes made
Against ITOS
None that don’t also exist for AstroRT