Various meters (monitoring feeders) – via polling using modbus-rtu,field devices (circuit breakers, isolators, switchers, power current coltage transformers,etc.) – via digital inputs the cs-iec-dcu polls configured meters in a continuous fashion and maintains the current values in contiguous internal registers. This aids in retrieving all meter data by a scada master or rtu in minimum number of polls from the dcu.the protocol support for communication with the control centre supervisory node rtu are: iec 870-5-104 or modbus-tcp.