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)
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
Call codes setting
Use the DIP on the back of each 821-M4 module to define the room number address of the key call, regardless of the installation location and order of the M4 module
The rules are as follows:
The last two bits of DIP do not need to be set, and the default is OFF