The Information Sharing Protocol (ISP) VCR (ISPVCR) is a software program written in Tcl/Tk that provides the capability to record and play back ISP data (telemetry, computations, ground system status, etc.) via Source Independent Telemetry Format (SITF) files. The ISPVCR provides a graphical user interface (GUI) that allows start/stop of the recording capability, specifying output file names, and start/stop of the playback of the SITF data file. The Orion Program chose to use the ISP to distribute data within the mission control center and other facilities. The ISPVCR package provides the capability to leverage legacy ISP software to provide record and playback of vehicle telemetry data via the ISP.

The software provides a GUI on top of existing ISP applications for the playback of recorded data. The previous capability provided only a command line interface and was limited to 20,000 symbols, while this software has no restrictions on number of symbols recorded.

This work was done by Brian O‘Hagan of Johnson Space Center. NASA has decided not to apply for a patent on this technology. For further information, please contact JSC at 281-483-3809 or e-mail This email address is being protected from spambots. You need JavaScript enabled to view it.. Refer to MSC-25608-1


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This article first appeared in the August, 2018 issue of Tech Briefs Magazine.

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