PMA or PM_ADDR – Parked Member Address
In a piconet , each slave in the park mode can be identified by a BD_ADDR ( Bluetoothª Device Address) or a dedicated PM_ADDR (Parked Member Address). The PM_ADDR is an 8bit member address allocated by the master to separate parked devices. Once a slave is in the active mode, it will lose the PM_ADDR and be assigned an AM_ADDR (Active Member Address). The PM_ADDR is set to eight zeros for the parked slaves who only use their BD_ADDR to communicate.
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