If there are 32 IM in one BDU zone, need to use the Power supply-PC7H Support one door station only ( new branch will issue soon) If more than three BDUs are needed, should use the old rule to set the key value of the button IM in one DBU zone: Normal IM Max.32, DX Max.8, DT47MG Max.12 Upgraded DT821/VD, DT821/M4, BDU are required for the above application
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