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FAQ: Difference between revisions
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→Cumulus doesn’t show the same pressure as my Fine Offset console
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The Fine Offset stations only store absolute/station pressure readings in their weather memory locations updated with each transmission and read by Cumulus. Within Cumulus, the software applies the adjustment to sea level before any further processing. It does ''not'' use the altitude setting in the cumulus station configuration screen. | The Fine Offset stations only store absolute/station pressure readings in their weather memory locations updated with each transmission and read by Cumulus. Within Cumulus, the software applies the adjustment to sea level before any further processing. It does ''not'' use the altitude setting in the cumulus station configuration screen. | ||
Normally when Cumulus starts, it reads in [http://www.jim-easterbrook.me.uk/weather/mm/ the fixed block] in the console a pair of absolute/station pressure and relative/sea level pressure readings and uses the difference between these as the ‘offset’ in millibar for the station; Cumulus uses this offset subsequently to calculate the sea level pressure (each time when reading the absolute pressure in the weather memory locations of the station), but it is possible to define the offset in '''Cumulus.ini''' instead. | Normally when Cumulus starts, it reads in [http://www.jim-easterbrook.me.uk/weather/mm/ the fixed block] in the console a pair of absolute/station pressure and relative/sea level pressure readings and uses the difference between these as the ‘offset’ in millibar for the station; Cumulus uses this offset subsequently to calculate the sea level pressure (each time when reading the absolute pressure in the weather memory locations of the station), but it is possible to define the offset in '''Cumulus.ini''' instead. | ||
'''IMPORTANT''' The above applies to Cumulus 1. bvs79669 did some investigation in January 2019 that reveals the mapping of memory bytes to pressure reported by Jim Easterbrook and used by Steve Loft is wrong. The two most significant bits included in the mapping create impossibly high readings for pressure. From build 3047, MX excludes these two bits and the reliability of reading correct pressure from a Fine Offset station has been significantly improved. | |||
Make sure that you have set your console's relative pressure correctly: | Make sure that you have set your console's relative pressure correctly: | ||