For SCADA Systems we used Control Micro System RTU , Advantech SCADA Servers and Citect SCADA Software . Solution has following features :

1 – RTU Operating temperature = -40 to 80 c
2 – No limitation for number of RTU and I/Os
3- DNP3.0 as communication Protocol over Serial or TCP/IP
4 – Advanced RTU Functionality
5 – Remote Configuration of RTUs
6 – Client /Server Structure in Control Room
7 – Master /Slave Structure for RTUs , Multi Layered Structure
8 – Many World Wide references