The D20 Remote Terminal Unit (RTU) design is based on a distributedprocessing architecture including the real-time data acquisition and control software. These I/O modules can be located close to the primary equipment being monitored and controlled as they receive and send data back to the master D20 main processor.
The I/O modules are intelligent modules that contain on-board microprocessors and are configured as slave devices to the D20 main processor. In the figure 1 pictorial setup, specific I/O processing is distributed throughout the D20 RTU to the appropriate I/O modules.
The I/O modules support two communication protocols: (1) DNP 3 protocol, and (2) high speed, high-level data link controller (D.20 Link) in the form of poll and response messages protocol. The peripheral modules have serial communication ports and various types of field connections. The hardware construction of each remote I/O module type is similar
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