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What is the difference between the ASBADU211 and the ASBADU212?

The difference between the ASBADU211 and the ASBADU212 is how they are powered (see below):

The ADU211 requires a external 24 Vdc power supply and draws less than 1 mA
from the internal +5 Vdc. In contrast, the ADU212 only draws power from the
internal +5 Vdc (450 mA typical, 600 mA maximum) and does not require an
external power supply.

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