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图例2
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需求设备：
DT821/VD: new upgraded firmware, version
DT821/T5: new upgraded firmware, version
BDU-V2: new upgraded firmware, version
2 wire monitor
升级点：
VD免配置，升级后可实现自动兼容BDU router以及normal模式
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New Settings in T5 Modular
Expand System
The default mode is Normal, which supports 32-users. when more than 32-users, we need first change the mode to Expand. (BDU is Router mode as default in new version, no need additional settings.)
IM setting （New menu)
The 8 zones represent the BDUs in the system
The first BDU is available as default
Click the icon on the right according to the actual project conditions to enable the corresponding BDU.
The button on the left at the bottom is used to search for the online status of the enabled BDU, which will be marked with a new icon after refreshing.