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The Cosmology Large Angular Scale Surveyor (CLASS) is an array ofpolarization-sensitive millimeter wave telescopes that observes ~70% of the skyat frequency bands centered near 40GHz, 90GHz, 150GHz, and 220GHz from theAtacama desert of northern Chile. Here, we describe the architecture of thesoftware used to control the telescopes, acquire data from the variousinstruments, schedule observations, monitor the status of the instruments andobservations, create archival data packages, and transfer data packages toNorth America for analysis. The computer and network architecture of the CLASSobserving site is also briefly discussed. This software and architecture hasbeen in use since 2016, operating the telescopes day and night throughout theyear, and has proven successful in fulfilling its design goals.

Control and systems software for the Cosmology Large Angular Scale Surveyor (CLASS)