An RTU consisted of a cabinet or panel of terminals for the instrumentation ... of these feeder IEDs in operation that are regularly polled by the SCADA master for updated analog and status data.

ModbusTools are cross-platform (Windows, Linux) Modbus simulator tools (client and server) with GUI to work with Modbus protocol (TCP,RTU,ASCII) ...

IEC 60870-5-104 Protocol - RTU Server Simulator, Master Client Simulator, Windows and Linux (ARM) Software development Kit, Source Code in C, C++, C# .NET Programming - Complete Implemetation ...