You can't power the B2M via the MIDI port. As specified in the MIDI standard, a MIDI-out port provides a 5V power supply to the MIDI receiver (MIDI In). The receiver uses this power to drive it's receiving circuitry. Only a small small amount of current can be supplied, but there are some devices which can be powered with this, such as MIDI mergers.
Since the B2M only has a MIDI out, it supplies power, it cannot be powered from MIDI (it has no MIDI-in).
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