• The Challenge Arizona’s Salt River Project (SRP) provides electrical power for much of the Phoenix metropolitan area. Power is generated by a mix of nuclear, hydroelectric, oil, coal and natural gas plants as well as renewables. Different substations on the grid use a variety of SCADA systems from multiple vendors, and each vendor implements its own circuits and makes its own recommendations about how to wire, ground, bias and terminate RS-485 ports. Communication glitches were a continual source of erroneous data errors and trouble reports, and they threatened to mask real substation problems. • The Solution B&B Electronics sent an engineer to work with SRP’s engineers and field technicians. Tracking down the source of the trouble involved making minor adjustments to term

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