DAVIS Vantage Pro Reference Manual page 15

It sets the elevation and barometer offset values when setting the barometer for a new
location.
<bar value to display (in Hg * 1000)-decimal>
If you have a current barometer reading from a very reliable nearby reference, you can use
this parameter to force the display to an exact setting. The console uses this value to fine-tune
its own adjusted barometric pressure calculations. Do not use this setting alone to correct
your barometer to sea-level.
Use a value of zero when you do not have an exact barometer value that you want the
Vantage console to display. This also clears out any existing offset value previously set.
This value should either be zero or between 20.000" Hg and 32500" Hg.
< elevation (ft)-decimal>
This is the primary means to correct the barometer measurement. Negative values for
elevation can be used.
This value should be between -2000 ft and 15000 ft.
Example (No local Barometer value, elevation 132 ft):
>"BAR=0 132"<LF>
<<ACK>
Example (Barometer value = 29.491 in Hg, elevation 0 ft):
>"BAR=29491 0"<LF>
<<ACK>
Example (Barometer value = 29.991 in Hg, elevation -75 ft):
>"BAR=29991 -75"<LF>
<<ACK>
"BARDATA"
It retrieves the current barometer calibration parameters in text. These tell you what the
current elevation setting and barometer offset values are, plus some details on the barometer
correction factor being used.
Example:
>"BARDATA"<LF>
<<LF><CR>"OK"<LF><CR>
<"BAR 29775"<LF><CR>
<"ELEVATION 27"<LF><CR>
<"DEW POINT 56"<LF><CR>
<"VIRTUAL TEMP 63"<LF><CR>
<"C 29"<LF><CR>
<"R 1001"<LF><CR>
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