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if protocols are the same then u have no problem
but different u should get some converter for a standard protocol with your scada
I will assume that SCADA systems means SCADA software.
For adding more RTUs to the SCADA system
1. to use a hardware protocol converter for the different RTUs protocols to a common protocol but this solution is headache and difficult to maintain
2. the other solution is to buy OPC server ( software) to be installed on the PC communicating with the RTUs and then the SCADA OPC client can get data from it, so its like adding the power to your SCADA software to read from different RTUs protocols