The older LOOP(1) package used by Rev "A" firmware (dated before April 24, 2002). Newer weather stations support this package type too.
The newer LOOP2 package used by Rev "B" firmware (dated after April 24, 2002 / Firmware 1.90^). Older weather stations don't support this package type. The Vantage Pro doesn't support this package at all.
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Type used to request LOOP1 and LOOP2 packages.