Ademco, formerly the Alarm Device Manufacturing Company and now part of Resideo, is a legendary name in security systems, fire alarms, and home automation.
Ademco (Alarm Device Manufacturing Company) helped shape the modern security industry with its reliable control panels, sensors, and peripherals. Acquired by Pittway and later Honeywell, the Ademco name became synonymous with the rigorous standards of professional security installation. Its flagship product lines, such as the VISTA series security panels, remain among the most installed systems in North America.
Today, Ademco products are manufactured and supported primarily by Resideo Technologies epi Honeywell Kay following a corporate spinoff. While the branding on newer devices may say Resideo or Honeywell Home, the underlying technology and legacy of Ademco continue to power millions of homes and businesses. Users looking for support for legacy Ademco hardware can typically find resources through the Resideo support network.
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Ademco was acquired by Honeywell, and its residential security division eventually spun off into Resideo Technologies. New products are typically branded as Resideo or Honeywell Home, though they are compatible with many legacy Ademco systems.
The standard default installer code for most Ademco VISTA series panels is 4112. Ideally, this was changed by your installer upon setup.
Many legacy manuals are available here on Manuals.plus or through the Resideo online support library, which archives documentation for discontinued Honeywell and Ademco products.