Used for data transmission from meter to M-DCU using RS-485 communication. It's S-DCU connecting capacity is max.32. WiringTwisted 1 pair wireComm.SpeedMax 9,600 BPSComm.DistanceMax 1.4kmComm.TypeRS-485,RF,PLCCCapacityNo. of connected meter:Max.32PowerAC220VDimension131WX66HX57DWeight385 PCB for S-DCU(Slave Distributed Control Unit)