The serial interface (i.e., RS232) is employed when the RDAU is nearby the SC.
As the input data is from asynchronous serial, and RDAU provides RS232, the communication between DE311 to RDAU is directly.
The RDAU, sends a signal to the server socket aiming to start a connection.
Since the main function of the SC subsystem is receive and store the data derived from the RDAU's, it can process and present them to operators through: i) SCADA (proprietors systems); or, ii) Human Machine Interface (HMI) specially designed for this purpose.
* Remote Data Acquisition Unit (RDAU) - maximum practicable data acquisition and obstacles susceptibility;
The RDAU improved the sampling rate, because it employs a DSP (TMS320F2812).
Both, the RDAU and the ISM, using the same transceiver for communication (TRF 2.4G).