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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 | 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. | ||
Make sure that you have set your console's relative pressure correctly: | Make sure that you have set your console's relative pressure correctly: | ||
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Sometimes the offset that cumulus reads from the fixed block is clearly garbage, so | Sometimes the offset that cumulus reads from the fixed block is clearly garbage, so | ||
# the cumulus error light is set, | # the cumulus error light is set {{Version badge 1}}, | ||
# an error message suggests you check the station, and | # an error message suggests you check the station, and | ||
# Cumulus uses zero offset instead as a best effort. | # Cumulus uses zero offset instead as a best effort. | ||
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where x.y is your pressure offset. '''Cumulus will then use this instead of reading the fixed block offset from the station'''. | where x.y is your pressure offset. '''Cumulus will then use this instead of reading the fixed block offset from the station'''. | ||
'''Note''' that ''you must supply the offset in hPa'' (i.e. the millibar units that the station works with) and that this circumvention generally stops Cumulus from agreeing with the relative pressure displayed on the console. | '''Note''' that ''you must supply the offset in hPa'' (i.e. the millibar units that the station works with) and that this circumvention generally stops Cumulus from agreeing with the relative pressure displayed on the console. ''If you swap from Cumulus 1 to Cumulus MX, remove this pressure offset'', MX is much better at communicating with the weather station and rarely needs use of this offset. | ||
== My pressure suddenly dropped! Or suddenly increased! == | == My pressure suddenly dropped! Or suddenly increased! == | ||